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Why Is There No Power Going To My Light Switch? (8 Possible Problems+Fix)

Written by Arthur Smith in Electrical Testing and Troubleshooting,Electricals 

Dark rooms are disorienting, and that’s why lights come into use. But it is very annoying to see the light not turning on. A major reason is power not reaching the switch. But what stops the power from reaching the switch? Let’s find it out. 

If the power does not reach your light switch, it could be a bad light switch, a problem with the wire connections, tripped breakers, or a bad light fixture. To fix the problem, change the light switch and fixture, reset the breaker, and call an electrician for wire cases. 

Though a professional can fix the problems without fail, you can also fix a few with a little trial and error and save money. Please read this article till the end to understand the reasons behind no power reaching the light switch and how to fix them. 

Why is there no power going to my light switch?

There could be a lot of reasons behind the light switch not receiving enough power. 

Due to insufficient power, your light will flicker or not light up. 

Without light, it is disorienting to roam around a dark room. 

So, the light and switch issues should be fixed soon. 

Install a new light to understand whether the problem is in the light or the switch. 

If it still does not work, the problem is in the switch. 

Sometimes, the switch will be fine, but the power will not reach it. 

Here are some of the most common problems behind light switch not receiving adequate power:

Flipped circuit breaker 

The circuit breakers protect your house from dangerous electrical issues.

The breaker provides power to the whole house and other circuits.

Whenever the breaker overloads, it trips to prevent short circuits and fire hazards.

If the flipped breaker is connected to the light switch, the light switch will not receive power to light up the bulb. 

You should check the breaker and flip it back to the ON position. 

When a breaker trips, the switch remains either in the OFF position or in the middle. 

If the switch is in the OFF position, flip it to the ON position. 

In the case of the center position, flip the switch to OFF, wait for some seconds, and turn it to the ON position. 

If your breaker trips again, there are some serious issues, overloading being the common one. 

Consider reducing the load in the breaker, or contact an electrician to look into the matter. 

GFCI breakers have a reset button. If the breaker trips, you need to press the RESET switch. 

Press the RESET switch for a few seconds until you hear a clicking sound, and then leave it. 

Your breaker will reset within a few minutes, and the switch should start receiving power.

You should reset the circuit breaker only once or twice. 

If the breaker trips again, stop resetting or flipping and hire an electrician to look into the matter.

Repeated tripping results from poor wire connections, bad switches, or live and neutral wires coming in contact. 

If the light switch fails to have power even after fixing these things, you should replace the switch. 

Fuse burnout 

A fuse burnout cannot send power to the light switch, thus causing malfunctions.

Inspect the breaker fuse before buying a new light. 

In this case, you should hire an electrician to replace the fuse breaker. 

If you face frequent fuse burnouts, you should reassess the amount of power to check whether you have overloading issues. 

An electrician may inform you of the right cause and fix the problem. 

Loose or damaged wire connections 

A lot of people complain about the problematic light switches. 

Sometimes, the problem occurs with the light bulbs rather than the switches. 

If you have already checked the bulb and switches and did not find them not working, the problem might be in the wire connections. 

Loose or damaged wire connections do not let the power reach the switch. 

As a result, despite having a good bulb or light switch, it won’t light up or keep flickering. 

Loose or damaged wires are extremely dangerous. 

An internal arc due to loose or frayed wires can lead to serious fire hazards. 

You should call an electrician to tighten loose and replace frayed wires. 

You can also fix it yourself if the problem is a minor one. 

Open the cover plate and reseat the wires around the switch. 

Short circuits

Solving light switch issues is the only way to fix light problems. 

Due to some short circuits, the power reaching the light switch will be cut off. 

As a result, the switch will not receive power to light up your room. 

In that case, you should remove the cover plate, remove the switch, and replace it with a new one. 

Cover exposed wires with electrical tape for grounding or short-circuit problems. 

Faulty circuit cable 

A faulty circuit cable is another reason behind the light switch not receiving power. 

For checking, use a circuit tester to check the light switch and find if there are any interruptions in the connections.

If you have a faulty circuit cable, you need an electrician to fix the problem. 

Broken mechanism

A broken mechanism in the switch sometimes stops the power from reaching the switch. 

The only way to solve the problem is by replacing the light switch. 

A common sign behind the broken mechanism is the light not turning on, no matter how often you flip it or use a new bulb. 

Another sign is the switch head will not stay in its position.

You can check for the broken mechanism by using a voltage tester. 

Turn off the power at the service panel and then remove the bulb. 

Connect the tester to the socket’s center and keep the light switch flipped off and then on.

If you do not find any change in the tester, it is confirmed that the switch is not receiving power due to the broken mechanism. 

Call an electrician to fix the mechanism and replace the switch. 

Ballast issues

A lot of lights have features called a ballast that help regulate the incoming voltage. 

If you hear humming or buzzing sounds and your light switch does not receive power to light the bulb, the ballast may be the problem. 

Ballast and light socket replacement will need wire splicing. 

So, you should consult an electrician to fix the ballast so that the switch can receive power.  

Bad light fixture 

Sometimes when the switch does not receive enough power, the switch is the problem.

But an incomplete light circuit in the light fixture can also be the cause. 

Though you can solve the issue easily with little electrical work, finding out which fixture part is creating the problem can be complicated. 

First, turn off the circuit in the breaker box and test the fixture continuity by removing it from the wall. 

Take a multimeter and touch one end to the white neutral wire and the other to the metal shell in one light socket. 

If everything is fine, the reading should be 0.000.

Similarly, check the black hot wire. Touch one end to the black wire and the other to the light socket’s brass part. 

The reading should be the same again. 

You will need the continuity from white to black wires to ensure the fixture is fine. 

If the readings are different, you have a bad fixture. Call an electrician to fix the problem. 

How do I test light switches with a multimeter?

Before you jump into the troubleshooting steps or buy a new light bulb or switch, check and confirm it. 

Testing the light switch lets you know the problem is genuinely with the switch.

For confirmation, you should check the light switch with a multimeter.  

Using a voltage tester or multimeter can save you from much trial and error. 

Here are some simple steps for testing a light switch with a voltage tester or multimeter:

  • Please turn off the breaker powering the switch because you won’t want to hurt yourself.
  • Remove the switch from the wall safely. 
  • Change the continuity tester to the CONTINUITY and OHMS setting. 
  • If the switch is single-pole, attach one pole on each side terminal. 
  • If the switch is 3-way, put one pole over the common screw and the other to the normal side terminal. 
  • Test both the side terminals on the 3-way switch. 
  • If the multimeter does not show 1, you have a malfunctioning switch. 

What to do with a light switch that is not receiving power?

You will likely have to call a professional to fix the light switch in maximum circumstances. 

But with a little experience, you can fix some minor issues yourself. 

At least, you can analyze the switch’s condition with the multimeter and ensure whether the problem is in the switch or something else.

Supplies needed:

  • Circuit tester
  • Flathead screwdriver
  • Philips head screwdriver
  • Needle-nose pliers

Here are the steps:

Safety 

Since you will be working with electrical stuff, taking safety measures is important. 

Make sure you wear protective gear and glasses. Keep moisture or metal-related things away from you. 

The wires should be capped, and use a marker or electrical tape for the wires you will be fixing.

Find the problem 

Before troubleshooting, find out what is wrong with the light switch and why it is not getting power. 

Check the breakers and fuses. Use your circuit tester to check the circuit cable. 

Remove the switch cover for closer observation if you find nothing in the breakers and fuses. 

Replace the switch 

In most cases, the problem is broken wire or wire joints. 

If that is the case, you should call an electrician. 

If the problem is with the switch, you should replace it. 

To replace the switch, begin by removing the switch from the wall with the wires hooked. 

Take the new light switch and screw it into the plate. 

Click a picture before removing the switch and the wires. 

It will let you fix the wires properly after installing the new switch. 

After you have attached the wires properly with the new switch, screw the switch cover in the wall and turn back the power. 

When should I call a professional?

Just because you can fix the switch yourself does not mean you do not require assistance. 

The work is electricity-related. So, you must always call a professional if you are not confident about handling the problem. 

Besides, if you do anything wrong in the process, that can lead to expensive damages. 

A professional can detect and fix the right issue without any potential damage. It will further save time and money.

It is better to be safe than sorry, especially about electrical projects. 

Final thoughts

Electrical issues are complicated to deal with, but you can solve most of them with a little training. 

If the light switch of your house is not acquiring enough power after flipping it on, consider checking all the above situations discussed above. 

Common issues are tripped breakers, blown-up fuses, and broken wire or wire joints. 

Before calling for help or replacing the light switch or bulb, consider testing the light switch with a multimeter or voltage tester. 

Testing will let you know whether it is the switch or if there are other issues.

Why is my light bulb flickering?

One common reason is light switches not receiving enough power. Others include a loose bulb or outlet, a faulty light fixture, and a defective dimmer switch.

Are flickering lights dangerous?

Flickering lights are the least dangerous, provided there are no wire issues or buzzing noises. Before calling a professional, you should check the light switch and the bulb.

Reference: Electrical Wiring Wikipedia, Home wiring Wikipedia.

Why Does My Outlet Have 3 Black Wires And 3 White Wires? (+How To Wire)

Written by Arthur Smith in Electrical Wiring,Electricals 

Ever wondered why your outlet has 3 black wires and 3 white wires? Rest assured, this wiring configuration is both normal and safe. Understanding the roles of these wires can boost your confidence when working with them.

The presence of three black and three white wires signifies that the outlet is part of a series circuit, where electricity flows from one source to another. The 3 black wires are the hot wires, while the 3 white wires are the neutral wires.

Seeing an outlet or receptacle with more than one wire is a common wire setting. In this article, we will discuss the reasons behind having 3 black and 3 white wires and how you can wire them together in an outlet. 

Why does my outlet have 3 black wires and 3 white wires?

There is nothing wrong with an outlet having more than one set of black and white wires. 

If you have such an outlet, you should know the wires’ impact to gather confidence while dealing with them. 

The live and neutral wires are needed to operate a circuit. 

If you have three black and three white wires, the three black wires will serve as the hot or live wires, and the three white will be the neutral wires. 

The live wire will help bring the current into the circuit, whereas the white wire will send it out and complete the entire circuit. 

This kind of wire setting is mostly seen in the 240-volt outlets used for heavy-duty appliances like dryers and ranges. 

Having more than two wires in your outlet allows multiple outlets to use the same electric current. 

The outlet is wired in series and will have more than one light fixture or switch to draw current from the breaker panel. 

An outlet will have more than two wires connected in the middle of the circuit, called a middle-of-the-run circuit. 

One set of black wires will supply electric current to the light fixture, and the white wire set will complete the circuit and go to the next outlet. 

Sometimes, there might be another wire called a ground or bare wire. The discussion about these wires is ignored as it does not have any current. 

But this wire can create an alternate path for current flow when there is a short circuit and saves you from electric shocks. 

Also read: Can you have 3 sets of wire in one outlet?

Is it safe to have 3 black wires and 3 white wires?

It is fine for an outlet to have 3 black and 3 white wires, provided each wire is properly connected to the right terminal and well-insulated to prevent contact with the other wiring. 

An outlet helps in receiving electrical current from the breaker panel or the previous outlet. 

It is used to power an appliance and return the unused power to the breaker panel. 

The current enters through the black wire through the other outlets and returns through the white wire to the panel. 

For heavy-duty appliances, an outlet with 3 black and 3 white wires is better and safer.  

However, the wires should be properly connected to the correct terminal using screw-in panels, insulators, and covers. 

Maximum panels have recessed screw-in holes, snap-over covers, and secure screws to ensure no wires remain exposed or have accidental contact. 

Can I nut the wires together?

When two or more wires are combined to carry electricity in a building, the process is called splicing. 

Though the activity is simple, the electrical system will be unsafe and unstable if the connection is incomplete. There will be further risks of fire and shock. 

If you wish to add more than two wires, you can use a jumper or wire nuts. 

A wire nut is one of the safest ways to combine three wires. 

It can tell you how many numbers and sizes of wires you can put together in each wire nut.

When an outlet has more than 2 wires twisted together, check whether the number of wires in the outlet can stay straight when other wires are around them. 

If there is a possibility, the straight wires will be easier to pull out and free themselves from splicing. 

How to wire an outlet with 3 black wires and 3 white wires?

Wiring an outlet with 3 black and 3 white wires is relatively easy. 

Still, you need proper experience and should follow precautionary steps. 

It would be best to disconnect the old outlet first before replacing a 3-wire outlet. 

Step 1

Locate the main circuit breaker in the electrical panel and turn it off. 

The breaker will be in the topmost place in the panel, with the highest amperage from the other breakers inside the house. 

Step 2

Find the terminal screws and expose them by pulling the outlet out from the box. 

Wire test the outlet with a multimeter to ensure it is not powered. 

Hold the multimeter and press all the black wires against the black probe’s tip. 

Also, press all the white wires against the white probe. 

If there is no reading, you are ready to start the project. 

Step 3

Use an outlet the same as the electric outlet you have previously removed. 

Remove the outlet cover and unscrew each terminal screw. 

The black wires are for the brass terminals, and the white wires should be connected to the silver terminal clockwise. 

Step 4 

Tuck the wires inside the outlet and mount the outlet in the outlet box with the screws coming with it. 

Now, replace the cover plate on the outlet.  

Once you have finished the wiring, switch on the circuit breaker at the main panel. 

Test the circuit with a 110-volt appliance to check it is functioning properly. 

3 black and 3 white wires in a GFCI 

GFCI stands for Ground Fault Circuit Interrupter. 

The outlet shuts off immediately after it senses an overload and prevents short circuits. 

GFCI is preferred in moisture areas like the kitchen, laundry rooms, bathrooms, and basements.

The wiring of the GFCI will differ from one manufacturer to another. But all follow the same guidelines. 

GFCI outlets containing 6 wires will have three similar wires, and the others will have a variant pair. 

Sometimes, the outlet will not have any ground wire. 

If it has three black and three white wires, it contains three live and three neutral wires. 

You need to connect the black wires to the brass terminals and the white ones to the silver terminals. 

If there is any green wire, connect it to the green ground terminal at the bottom of the outlet. 

How to wire a GFCI outlet with 3 black and 3 white wires?

Wiring a GFCI outlet involves the following steps:

  • Ensure you have turned off the panel controlling the circuit to avoid electric shocks. 
  • If the breaker is not labeled, put a lamp or clock radio in your wiring outlet to identify the right wires. 
  • Once you find the right circuit, mark it with tape.
  • Check the outlet with a tester to ensure the power is off. 
  • Remove the receptacle’s cover plate, unscrew the outlet, and disconnect the wires from the outlet. 
  • Strip the power supply wires and reattach them to the LINE terminals. 
  • Connect the black wires to the brass screw and the white wires to the silver screw terminal. Connect the green to the bare ground screw. 
  • Fasten the outlet back in the box, replace it, and screw the cover plate. 
  • Turn on the power at the circuit panel and connect a clock radio or a lamp to the outlet for a power check. 
  • Press the TEST button. If the lamp or the radio goes off, your outlet is working. 
  • Reset the outlet by pressing the reset button. Keep pressing until you hear a click. Your lamp or radio should turn on. 

In some outlets, you can remove the wire ends and place them in the push-in holes on the outlet’s back. It is called backstabbing. 

However, backstabbing is not recommended as it can be dangerous. 

It will create a bond between the circuits, and some hot wires may remain on in some breakers. 

Another way of wiring GFCI with 3 black and 3 white wires

If you want all the wires in the same outlet:

  • Turn off the power at the main panel for safety purposes. 
  • Connect the hot black and white neutral wires to the LINE terminals. 
  • Cut a short piece of the white and black wire and connect them to the LOAD terminals. 
  • Connect the other ends of the short black and other black wires with a wire nut. 
  • Repeat the same process with the white wires. 
  • Connect a lamp or radio and press the TEST button for checking. 
  • If they work, turn on the power and reset your GFCI outlet. 

Also read:

Final thoughts

Do not panic if you see 3 black and 3 white wires in an outlet. The setting is quite common. It indicates that your outlet is in the middle of a circuit and wired in series. You will see this type of wiring in the 240-volt outlets needed by heavy-duty appliances like dryers. 

The black wires help bring the electrical flow into the outlet, and the white wires bring it out and send it to the next outlet. The presence of six wires in an outlet is safe as long as the wires are connected to the right terminals. The black wires should be wires to the brass terminals, and the white wires to the silver terminals. 

Wrong terminals can lead to short circuits and fire hazards. Some GFCIs will also have the same setting. Unlike normal outlets, GFCIs sometimes do not have a ground wire. The ground wire is used for safety as it creates an alternate path for the current flow during short circuits. If you have a green or bare wire, connect it to the green ground screw.

How many wires should be in one outlet?

The electrical engineers specify that a maximum of six wires should be present in each outlet. If you have multiple wires in an outlet, you should have multiple outlets, each using the same current.

Can I pigtail an outlet?

Yes, you can pigtail an outlet by connecting the two ends of one wire with another. It gives extra space in the outlet box and prevents the wires from touching other things. Getting it done by a professional is highly recommended.

Reference: Electrical Wiring Wikipedia, Home wiring Wikipedia.

Should Outlets Be Wired In Series Or Parallel?

Written by Arthur Smith in Electrical Outlets and Switches,Electrical Wiring,Electricals 

Both series and parallel wiring can power multiple devices using current flow through the wires. But which is better for the outlet wiring is quite a subject of discussion. 

Most of the 120 V outlets should be wired in parallel circuits. That allows every circuit to have its independent hot and neutral wires to maintain a continuous circuit pathway without interrupting each other. In such a case, even if one outlet is not working, the other outlets won’t be affected.

While wiring is best depends on the usage method. This guide will explain everything about series and parallel wiring, the difference, the benefits, and which suits the present situation. 

What is a Series circuit?

A series circuit is a closed circuit where the electrical current flows in one direction. 

The current in the series elements is the same as the source current. 

The devices connected to the circuit loop are connected in a continuous row.

If any device fails, the whole circuit will disrupt, and all the devices will stop working.

The circuit’s energy lessens by adding a new outlet or component. 

Should you wire outlets in series?

As I said, wiring outlets in series means there will be only one pathway for the current flow. 

If one device or light goes off, all other devices connected to the circuit will turn off. 

So, should you prefer a series circuit?

Generally, there is no problem in wiring an outlet in series. 

Series circuits are mostly used in simple circuits where multiple failure chances are less. 

It will control multiple devices with a single switch, for example, industrial environments, landscape luminaries, Christmas tree lights, and street lamps. 

Lawnmowers are also wired in series for safety purposes. They have only two buttons or switches to turn on. 

Why should you wire outlets in series? – Advantages 

Let’s look at the advantages of wiring the outlets in series:

  • The series circuits do not overheat easily. So, they can easily be around flammable sources. 
  • The series circuits are easy to learn, design, and repair.  
  • Since there is only one pathway, all the components will have a constant current. 

Why should you not wire outlets in series? – Disadvantages 

Despite having such good merits, the series wiring will have some demerits which do not make them an ideal choice:

  • If any one component fails, the entire circuit will break down. 
  • If you increase the number of components, there will be a rise in the resistance. And as we all know, higher resistance leads to overheating and fire hazards. 

That is why you should not wire the outlets with a series circuit, especially in houses. 

What is a Parallel circuit?

Outlets wired parallelly allow the current to flow across two or more pathways. 

All the outlets connected to the parallel circuit will have the same voltage. 

The voltage across all the parallel outlets is the same as the source voltage. 

The current in each element will change based on the impedance or resistance of each element. 

The devices tapped in this circuit loop are connected in a column form. 

If any one device fails, the remaining circuit will keep working. 

A parallel circuit is used in most normal houses for outlets, switches, fans, light fixtures, and other common 120V circuits. 

Should you wire outlets in parallel?

Parallel wiring is good for both industrial and residential environments. 

Nowadays, Christmas lights and street lights are wired in parallel. 

When one goes off, the other remains the same.

Except for the switches, almost all the devices in the residential houses should be wired in a parallel circuit. 

Since parallel circuits have multiple pathways for the current flow, most people prefer them nowadays. 

Why should you wire the outlets in parallel?

Let’s look at some advantages to ensure why people should wire outlets in parallel:

  • All components attached to the circuit will consistently share the same current amount.
  • Connecting or detaching a component will not affect the other components or the circuit. 
  • The current can pass through different paths if a component has any fault. The feature is good for circuits with several devices like light circuits. 

Why is parallel sometimes not preferred?

Despite having some good advantages, some people still prefer series over parallel. Here are the reasons:

  • While wiring an outlet with a parallel circuit, you will require a lot of wires. It can make the connection messy and later cause problems in separating. 
  • Due to multiple pathways, there is a decreased resistance. As a result, you cannot increase the voltage. 
  • Finding faults in parallel circuits is more complicated than the series circuit due to being multidirectional. 

Due to these reasons, some people recommend not to wire the outlets in parallel, but in series. 

Which one should you prefer? Parallel vs Series

You can wire the outlets in both series and parallel. 

But, the circumstance and the benefits you receive make you select between the two. 

Let’s have a look at some major differences between the two circuit types to gather better knowledge about which one to prefer:

Number of branches

The series wiring has one branch, through which the current passes from one device to another in a linear form. 

The parallel circuit splits into different pathways where each device stays independent and does not flow into the next device. 

The pathways affect the circuit reaction to the failure of one component and power distribution to each of the devices. 

Common use case scenarios

A series circuit means you will see a single branch circuit for numerous devices with only one point of failure. 

This type of circuit is used in large-scale industrial settings where you see hundreds of components. 

Controlling them with a single-branch circuit is easier and faster. 

The settings will become complicated if you use a parallel circuit. 

Parallel circuits are better for locations where safety is a concern, for instance, houses. 

If one component fails, the others should run. 

Current direction and distribution

The electricity direction in the series circuit is unidirectional. 

The series circuit has only one single lane, and there is no other way for the current to flow or split. 

So, any interruption in the current flow will affect the devices connected to the circuit. 

On the contrary, parallel circuits are multidirectional. 

Since it has multiple directions, the current will split and flow through other directions. 

So, an interruption will not affect the whole circuit during operation. 

All the devices will have the same current flow in a series circuit. 

But on a parallel circuit, the current is divided among each device. 

Voltage distribution 

In a series circuit, the voltage distribution occurs among the devices within the circuit. 

The first device in the current will receive the maximum voltage, whereas the last device will receive very little current. 

If you use a series circuit for your lights, they will provide dim light when you add up more components. 

On the contrary, outlets in parallel wiring will provide an equal amount of voltage to all the components. 

The exception is that the single parallel lane will have multiple devices, which works as a mini-series circuit within a large parallel circuit. 

In such a condition, the voltage will get distributed like the series circuit between the devices on the individual lane. 

Home usage and effects on other devices 

Since a single failure can disrupt an entire circuit, the series wiring is not recommended for household outlets. 

It will be frustrating to see your refrigerator not working just because a light blew up. 

Not just the fridge but the entire house will go down if a single device blows off. 

Such things are against the electrical code guidelines as it is a safety hazard. 

So, houses prefer a parallel circuit where the other devices won’t be affected due to a single device’s failure. If one fails, others should still work. 

Power drawing quantity

The power draw will fade whenever you add a device to your series wiring. 

The first device consumes more power than the one at the last. 

On the contrary, the devices in parallel wiring will draw the same amount of power, be it the first or the last. 

Reliability

In a series circuit, the failure of one device will turn down the entire circuit. So, it is not reliable enough. 

A series circuit is used for areas where wiring outlets in parallel can be troublesome. 

The circuit will keep functioning in parallel wiring even if one device malfunctions. So, its reliability is more. 

That is why it is commonly used in houses where the areas should be lit even if one device malfunctions, like rooms or a car. 

Electrical code guidelines

Connecting the outlets in series is considered a safety hazard, and thus it violates the electrical code guidelines. 

Parallel circuits are considered the safest and most efficient wiring configuration.

How to wire outlets in series?

Before starting the work, turn off all the power in the circuit breakers and electrical panels. 

Check the outlet with a multimeter to confirm the power is off. 

Below are the steps to wire outlets in series:

Disconnect wires from the first outlet 

Remove the hot, neutral, and ground wires from the first outlet, but keep them inside the box. 

Run the wire length from the second outlet going to the first one. 

Drill holes into the studs and run the wire through them from one outlet to another. It will be easier in the new construction. 

For the older construction, remove the drywall. 

Unscrew the small knockout plate on the box’s side, insert an 8-inch wire in each box, and cut the ends with a knife. 

Cut the taps to wire the outlets. 

Cut the taps, pigtails, and conductors to wire the outlet in series. 

The taps are the short length of the wires, and you will cut three of them. It should have one each of hot, neutral, and ground. 

Cut only a few inches in length, strip off ½ inch of insulation from the ends, and keep them aside. 

Prepare to wire the second outlet. 

For preparing the second outlet:

  • Cut off 4 inches of the sheath from the wire inside the box. 
  • Separate the three wires and strip ½ inch of the insulation from each. 
  • Connect the end of the black wire to the brass terminal and screw the white wire to the silver terminal. 
  • Now, screw the ground wire to the metal screw inside the junction box. 

Wire the screws

Now, wire the series. 

  • Strip off ½ inch insulation from the wire ends in the first outlet box. 
  • Bring the black wire to the second box, the black wire into the first outlet, and the black tap together. 
  • Twist the bare ends of the three wires. 
  • Secure them with a wire connector and cover them with electrical tape.
  • Keep the tap’s other end free. 
  • Repeat the same thing with the white wires and the ground wires. 
  • Connect the black tap’s loose end to the brass terminal, the white tap’s end to the silver terminal, and the ground tap to the ground screw inside the box. 

You have successfully wired the outlet in series. 

Since the steps are complicated, you can hire a professional electrician to wire. 

How do you wire outlets in parallel?

In parallel wiring, you must wire the neutral and live wires by pigtail.

Turn off the power before working on any electrical projects. Let’s begin with the steps:

Wire the outlets in the middle of the circuit

Once you turn off the power, you need to wire the outlets in the middle of the circuit. The process will have 4 sub-steps:

Run up the Romex

The outlets up to the last are considered to be in the middle. 

Romex is a non-metallic sheathing for wires. 

Run up the Romex through the first outlet box’s underside. 

Strip off 6 inches of the insulation to separate the 3 wires – black, white, and green or bare – from inside the Romex. 

Strip off the insulation from the wires.

Strip off around 1 inch of the insulation from the black, white, and green wires. 

On the outlet, you will find 2 silver screws, 2 brass screws, and 1 green screw. 

Attach the white wire to the lower silver screw and the black one to the lower brass screw. 

Feed the Romex through the outlet box’s top hole.

Feed enough Romex through the box’s top hole and extend it to the next outlet. 

Bring it from the hole in the second outlet box’s bottom. 

Leave around 6 inches extending to the first outlet box and the second box, respectively. 

Go back to the first outlet and strip the wires similarly. 

Twist the wires together.

Connect the second white wire to the upper silver screw and the second black wire to the upper brass screw. 

Connect the small green wire with the green screw in the first outlet. 

Now, pigtail the other end with the 2 ground wires coming and leading out of the first outlet box. 

Twist the 3 wires together and screw a wire nut at the end for the pigtail. 

Connect the other outlets.

Connect every outlet in the middle in the same way. 

Lead into every outlet box from the bottom and exit through the top to move to the next outlet. 

Pigtail the ground wires in all the outlet boxes. 

Attach a small green wire from each pigtail with the green screw of the outlet. 

Use an extra wire length to make the ground connections if needed. 

Complete the circuit end

Now, it is time to complete the circuit. 

Here, enter only the Romex in the outlet box. 

Strip the Romex in the box and the individual hot and neutral wires. 

Connect the white wire to the upper silver screw and the black one to the brass. 

Pigtail with the ground wire from the Romex and the ground wire length connecting to the green screw. You are done.

Check each connection once again. Make sure to avoid attaching the outlets to the wall right now. 

Turn the power to check and test the powers. 

Once you have confirmed every connection’s performance, install them in the outlet boxes. 

Screw the faceplates back. 

Since the steps are too complicated, consider calling a professional for the job.

Final thoughts

You may wire the outlets in both series and parallel. It depends on the circumstances. Wiring outlets in parallel are preferred in the houses. They have multiple paths for the current to flow. When one device in the house fails, the others should keep working. 

On the other hand, the series circuit has only one pathway for current flow. If one device fails, the entire circuit disrupts. If you wire your house outlets in series, the whole house’s power will be down if one device fails. It is against the electrical code guidelines. 

Even with such a feature, a series circuit is preferred in places with large-scale industrial settings, for example, factories, street lamps, or Christmas lights. It would be challenging to handle hundreds of devices separately in such places. That is why the series circuit is preferred in such areas. 

Why are house outlets not wired in series?

The energy used in each device reduces when you wire extra items in series. As a result, 3 devices wired in series will give the outlet insufficient current.

Which is safer: series or parallel?

Both are safe. A series circuit is safe for large-scale industrial settings with hundreds of devices and can turn them off together. Parallel circuits are safe in houses where safety is a concern.

Reference: Electrical Wiring Wikipedia, Home wiring Wikipedia.

Gas Furnace Troubleshooting Guide

Written by Arthur Smith in Furnaces and Boilers,HVAC 

Gas furnaces can keep the temperature of your house warm during the winter. When winter arrives, your gas furnace will work overtime to maintain the warmth. In that case, you must ensure it remains in good condition. But since it is a machine, it can face certain issues. 

The common problems in a gas furnace are weird noises, dirty filters, furnace not starting, failed ignitor, furnace not producing enough heat, a faulty thermostat, gas leakages, and pilot lights out. Regular maintenance and replacing faulty parts when needed will help keep these problems at bay.

The list continues. You can solve some yourself, and others require experts’ consultation. In this article, we shall discuss these problems and provide a detailed troubleshooting guide for a gas furnace. So, let’s begin right away.

Gas furnace problems and troubleshooting them

A furnace is an important part of the house, mostly during the winter. 

So, you need to keep it safe throughout the season. 

A gas is a home heating unit that runs on natural gas. 

The gas ignites inside the furnace, warms up the surrounding air, and spreads throughout the house. 

You will need the furnace to run most of the time in winter.

You should fix it as soon as you detect any problem in the unit. 

Below I have shared some common problems a furnace can face and the simple ways to troubleshoot them:

The furnace is not starting

There could be either some serious reasons behind a furnace not starting or some silly reasons:

  • You have not turned on your furnace. Your furnace will take a few seconds to start. 
  • The circuit breaker connected to the furnace is off or tripped. You need to turn it on or reset it. 
  • The thermostat is not set to heat, so the furnace is not starting. 
  • The thermostat has some loose wire connections. Open the thermostat and check for loose connections. If you find any, tighten them properly.
  • The thermostat battery died, and it needs new batteries. 
  • The filter may be dirty. Some furnaces are equipped to shut down when the filter fails to allow enough airflow due to excessive dirt and debris. It can also cause serious mechanical failure. Replace the filter. 
  • The circuit board of the furnace is bad. Change the circuit board or find its fault and start your furnace.

So, before you start troubleshooting a furnace that does not start in some other way, consider checking these things so that you don’t end up with the wrong solution. 

The furnace keeps shutting off.

You turn on the furnace, and the burner lights turn on, but the furnace immediately shuts off. 

The common reasons could be:

  • Some furnaces automatically shut off if the filter is dirty, and it blocks the airflow. Please take out the filter and clean it regularly or replace it. 
  • The flame sensor is not working, for which the burner lights, but the furnace shuts off. Change it. 
  • The thermostat is faulty. You need to replace the thermostat with a new one. 

Consult a technician if you do not find any of the reasons above in your furnace. 

Besides, they can troubleshoot the problem better than you. 

The furnace gives cold air.

A furnace is supposed to produce heat. But if it is producing cold air, something is wrong with it. 

Maybe the heat registers are closed for which the furnace is blowing cold air. 

Check the heat registers and make sure they remain open. 

A furnace could blow cold air because the gas is turned off or you are running out of it. 

Check the gas cock near the furnace and ensure it is parallel to the gas line. 

Check that your gas tank is full. 

Call your gas supplier for a fill-up if the pressure gauge reads less than 15%.

If the position is wrong, change it and bring it to its place. 

When the draft motor does not work well, it cannot pull the hot combustion through the furnace. 

As a result, the furnace provides cold air. 

Check the draft motor and fix it.

The furnace filter is blocked, so it cannot take in fresh air to heat it and release it. As a result, it blows cold air. 

Please remove the dirty filters and clean them to let the furnace heat up your room. You can replace them if the dust and debris are too much.

Gas furnace failing to ignite.

Gas failing to ignite is another reason behind cold air. 

Sometimes, you will find that you have turned the furnace on and the fan is running, but the unit is releasing cold air. 

It is simply because the gas is not igniting. 

In such a condition, consider resetting your furnace. 

Turn the switch to the off position for 10 seconds, and then turn it on again. 

Your furnace should start working and releasing warm air after some time. 

If the method fails, it is time to call a professional. 

The draft motor is running, but the furnace remains shut

A draft motor pulls the hot combustion gasses through the furnace and releases them out of the exhaust. 

If you find that the draft motor is working well, but the furnace still won’t start, the following could be the reasons:

  • The motor or the board controlling the motor has failed. You need to replace it with a new one. 
  • The air intake or the exhaust chimney got blocked due to snow, dirt, debris, bird’s nest, etc. Check and clear it soon so that the furnace starts working. 
  • There might be some problem with the gas valve or the ignitor. If the gas valve does not open, or the ignitor is not lighting, you need to replace it. 

The burner starts to heat but shuts off before warming the house

The burner will start when you turn on the furnace to warm up your house. 

But, if the furnace shuts off before the burner can heat your house properly, the problem could be in the flame sensor. 

It could be due to corrosion. 

You can fix a corrosive burner by sanding it. Still, replacement would be a permanent solution and a long-lasting fixation. 

Blower running continuously 

The blower should shut off once you shut down the heating unit. 

But if it does not turn off, there could be 3 common reasons behind it:

  • You have kept the fan switch in the ‘On’ position in the thermostat instead of ‘Auto.’ Correct it and keep it in the ‘Auto’ position. 
  • The relay in the control board got stuck in the closed position, for which the blower is constantly getting electricity for running. Replace the control board by hiring a professional.
  • Thermostats have contacts to control the power to the furnace. If these contacts get worn out, the blower will not stop. In that case, you need to replace your thermostat. 

The furnace is not producing enough heat.

Furnace comes in different sizes, determined by BTU (British Thermal Unit). 

Different houses will require different sizes of furnaces. 

If you have bought a furnace that is smaller than your house, it won’t be able to provide enough heat to your room.

So, you need to replace the thermostat and find the one that suits your house. 

For example, 

  • 500 square feet – 12,000 BTU
  • 1,000 square feet – 24,000 BTU
  • 1,500 square feet – 36,000 BTU

The BTU size can differ based on the weather conditions of your region. 

Hotter zones require a furnace smaller than it needs. 

You need a larger furnace than the required size for a colder zone. 

Other reasons behind insufficient heat could be:

  • The filter type does not suit the furnace and blocks the airflow. You need to replace it with a new one suitable for your furnace. 
  • The filter might have got installed backward. Look for the arrows over the filter frame to check the direction of installation and airflow. 
  • The air ducts are leaking, so the furnace cannot produce enough heat. You can understand it by whistling noises. Fix it by either replacing the air ducts or sealing them. 
  • Another reason is dirty filters. Use washable filters so that you can wash and use them instead of buying them repeatedly.

Vents are closed or blocked.

Closed vents are another cause of insufficient heat inside the house. 

A furnace works by making heat. 

It then pumps the hot air out through the vents of your house to raise the house temperature. 

If your furnace is on, but your house is not warming up, ensure the vents are open. 

Vents are mostly located on the rooms’ floor, ceiling, or walls. 

If they are closed or blocked, the house won’t receive enough heat. 

If the vents are blocked, check for snow, ice, or household items quickly. 

Turn off the furnace power, open the vent, and clear away the blockage of your exterior vent. Now, put back everything and turn on the furnace. 

The furnace is making noises.

If a furnace is making a lot of noise, the reason could be some of the following:

  • The furnace is a single-stage model, but it is running over time. You must run a furnace according to its capacity. Either get a high-capacity furnace or avoid running it over time. 
  • The blower motor at the lower part of the furnace is failing to work. You need to replace it with the help of a professional. 
  • There might be some leakage in the furnace cabinet, sheet metal plenum, or ductwork near the furnace. Tighten these parts, seal the leakage, or replace them.  

The air coming out of the furnace has a bad smell.

It could be due to dirty air filters. Open the furnace and clean the air filters by brushing the dirt or cleaning them with water. 

Another reason could be some small dead animal inside the system. 

Troubleshooting this problem will be the job of a furnace technician.

Dirty air filter 

A dirty air filter inside the furnace is one of the common reasons behind most of the abovementioned problems. 

You need to clean the filter regularly. 

The best option would be to buy a washable filter. 

You can take it off, clean it easily with water, and place it back once the filter dries off. 

Here are the steps to troubleshoot a dirty filter problem:

  • Open the furnace’s external panel door. 
  • Remove the filter by gently sliding it out. 
  • Check the filter closely for darkness or discoloration. 
  • It is pretty dirty if you cannot see anything through the filter. 
  • Either replace the filter or clean it properly. 
  • If you are replacing it, make sure you have installed it in the direction of the airflow. 

Gas furnaces have yellow or uneven flames.

The old gas furnaces used to have blue flames when turned on. 

The recent gas furnaces have an electric ignition system that illuminates when necessary. 

So they do not have any flames.

If you have an old model, a good gas furnace should always show blue flames when ignited. 

But, if you find the flames yellow or uneven instead of blue, the reason could be dirty or blocked burners. 

If you notice such a problem, you need to call an HVAC professional and make a routine for furnace and burner maintenance. 

The pilot light is not turning on.

All the gas furnaces made before 2000 used to have pilot lights. 

These are the furnaces that produce blue flames. 

A pilot light will be lit whenever the furnace produces a blue flame. 

A pilot light is controlled by a knob on the furnace’s bottom. 

If the pilot light stays off, but the furnace is on, try relighting the pilot light.

You can always relight the pilot light by turning off the knob, waiting for a minute, and turning it on again. It’s a kind of resetting the light. 

Another reason is the gas valve is off and not supplying enough gas to the pilot light. 

A gas valve has 2 valves:

  • The safety valve supplies gas to the pilot light
  • The main valve supplies gas to the burner trays. 

If the pilot light is off, check the gas valve and ensure it is turned on and supplying enough gas. 

If you run out of gas or suspect a gas leakage, call an HVAC professional for help. 

Thermostat and furnace mismatch

Some gas furnaces need electricity. 

So, a mismatch in the thermostat and furnace will cause faulty furnace operations, for example, an overheated or underheated furnace, despite having proper thermostat settings. 

While buying a gas furnace that needs a thermostat, make sure to match both of them. 

Three thermostat types are available – millivolt, low voltage, and line voltage. 

Make sure that you have chosen the correct one for your furnace.

Also check:

Final thoughts

There are multiple problems a gas furnace can face. 

There could be more than those mentioned in the article. 

Since it is an important part of the house during the winter, troubleshooting the problems is very important. 

You can troubleshoot some problems yourself, but most require an expert HVAC team. 

Calling a professional is always wise as it can prevent expensive damages and save time.

Before you troubleshoot any problem yourself, consider finding the real cause. 

Otherwise, if you fix the furnace for something that is not the real cause, you can damage the furnace. 

Doing it yourself may save some money, but calling an expert will save you in other ways. 

So never hesitate to consult them. 

Reference: Wikipedia.

13 Reasons Your Furnace Is Leaking Water (+Fix)

Written by Arthur Smith in Furnaces and Boilers,HVAC 

Furnaces are very important during the winter. But many things can go wrong with the unit, water leakage being one of them. Water leaks can lead to serious issues, including mold. If you do not fix it in time, you will become ill and have to spend money on house repairs.

The major reasons behind water leakage in the furnace unit are condensate problems, frozen coils, damaged drain pans, humidifier leaks, heat exchanger issues, and inducer assembly cracks. Fix all the leakages and cloggings, and replace the components if needed. 

Many house owners deal with this problem and must solve it soon to avoid worse situations. Otherwise, it is only a matter of time before your furnace fails and needs replacement. 

How does the furnace work?

When the indoor temperature drops below the thermostat’s set temperature, the thermostat will signal the control board inside the furnace to start the heating cycle. 

The unit starts by turning on the flame switch, opening the gas valve, and turning the draft fan for combustion. 

The combustion warms the heat exchanger. 

The flue gas inside the exchanger will release outside the exhaust pipe. 

After that, the blower fan will blow cool air from inside your house past the exchanger. 

From here, the air will absorb the heat forced throughout your house by the ventilation system. 

That is how the furnace spreads the warm air. 

What type of furnace do you own?

Before you discover the reasons behind a leaking furnace, you must know the type of your furnace. 

The easiest way to find out is by checking the exhaust pipe. 

If the line is white plastic PVC, you have a high-efficiency furnace. Since they generate condensation, leakage chances are more here.

If you have metal exhaust pipes, you have the standard non-high-efficiency furnace. It does not generate any condensation.

Where does the water come from in the furnace?

Not all furnaces will produce water. 

The high-efficiency furnaces will produce water due to condensation. 

The condensation increases because of the second heat exchanger. 

That is why high-efficiency furnaces are also called condensing furnaces. 

Conventional furnaces do not produce water and are therefore called non-high efficiency furnaces. 

Once the burning gas goes out of the primary heat exchanger, it reaches the second exchanger.

The exhaust and flue pipe undergo another heat exchange in the second exchanger. 

These exchanges make water vapor. 

When the water changes from vapor to liquid, more heat is released in the second heat exchanger, making the unit work more efficiently. 

From that point, the condensation is drained to the condensate pump or floor drain.

Why do high-efficiency furnaces leak water?

The following reasons are responsible for high-efficiency furnaces leaking water:

1. Leaked or clogged condensate pipes

High-efficiency furnaces generate enough condensation due to the heat exchanger process. 

When the exchanger runs properly, the furnace will drain the condensation through the condensate line and drain trap. 

If the condensate lines have leakage or clogging, the water will leak around your furnace because it has nowhere to go. 

The water will back up and leak out of the furnace. 

You can reopen the lines and clean them by pouring hot water or vacuuming them. 

If the pipe is broken, it cannot hold the water and start leaking. You need to replace it with the help of HVAC experts. 

2. Mechanical problems in the condensate pump

The condensate pump pushes the water through the condensate lines and away from your furnace. 

If the furnace is installed in the basement, the drain pipes will be below the surface level, and the water will pump out.

So, the pump will pump out the water that drains into the pump tank through the hose and out of the outdoor’s drain line. 

These pumps can malfunction due to mechanical issues, like jamming or damage, causing leakages. 

The pump and the drain lines will overflow and flow the water back into the furnace and your floor. 

Improper installation of the pump can cause leakages. 

You must call an HVAC expert to inspect the pump and resolve the problem. Your pump may require replacement or repair. 

3. Leaked condensate drain line

When the water needs to exit, it should pass through the condensate drain line. 

The water will leak around the furnace when the connection gets cracked or has holes. 

The condensing furnaces have a drain vent made of PVC. 

The vent gets disconnected due to cracks or holes. As a result, the water will escape from that crack and leak from your unit. 

A clogged drain line will take the condensation back to your unit and leak over the floor.

Problems in condensate drain lines are very common for high-efficiency furnaces. 

Another problem is a rusted condensate pan. It happens when the pan is very old.

You must call a plumber or HVAC expert to replace the drain lines. 

To clean the drain lines:

  • Turn off your furnace. 
  • Find the condensate pan and drain the water with the duster. 
  • Clean the pan and the pan house with soapy water. 
  • Find the drain’s outside outlet and clear the clogs with the help of the Sink Snake Drain Cleaner. 
  • Wash the drain with hot water, vinegar, or hydrogen peroxide, and a drop of dishwashing soap to clear the remaining dirt. 

If you cannot do it yourself, hire an HVAC expert. 

4. Clogged condensate trap

A clogged condensate trap also will take the water back to the furnace and end up leaking and overflowing around the furnace. 

However, all high-efficiency furnaces do not have condensate traps. 

Clean the trap by hiring an HVAC professional. 

5. Leaked inducer assembly

The condensation goes down to the exhaust pipe through the condenser drain hose and then to the inducer. 

If the inducer assembly is cracked, the water will leak out of the furnace. 

Hire an HVAC expert to get it repaired or replaced.

Why do conventional furnaces leak water?

The high-efficiency furnaces are more prone to water leakage due to their condensation. 

But that does not mean that the standard non-high-efficiency furnaces will not leak. 

Here are the major reasons behind a conventional furnace leaking water:

6. The metal exhaust creates condensation.

Furnaces having an AFUE rating below 90 are considered conventional furnaces. 

You can differentiate the two types with the pipes. Conventional furnaces have metal exhaust pipes.

These pipes take the gasses generated in the combustion process through the metal exhaust pipe and then away from your house when the gasses are hot.

When the venting pipe is improperly installed, has blockages, or the size does not match your furnace, the gasses will remain trapped by too much air. 

Once they cool down, there will be condensation, and the furnace will leak water.

You must check the exhaust vent and look for clogs, disjoints, and bad joints. 

It would be best if you repaired them to make a clear path for the gasses to release. 

Here also you need an expert to deal with the matter, especially if there is any crack.

7. Leaking AC unit

When you live in a mild climate, you must use both the air conditioner and the furnace. 

When your air conditioner functions, the condensation pan fills up too much with water over time. As a result, some water will drip into the furnace. 

It may look like a furnace leaking water, but the problem could be simply an overflowing condensation pan. 

When this happens, you must empty the pan or call an HVAC professional to fix the problem.

Other reasons behind a leaky air conditioner are:

Damaged drain pan

Clogged drain line

It may seem like your furnace is leaking, but it is the air conditioner. 

8. Failed condensate pump

A condensate pump helps to drain the condensation from the HVAC system. 

If your furnace and air conditioner share the same pump, there could be chances of leakage if the pump has too much moisture. 

The water will overflow and leak around both units.

9. Frozen coil

When a furnace leaks in the winter, it is the frozen coils from the air conditioner. 

When the ice on the coil starts melting, the drain pan will overflow, and some of the water will pass to the furnace. 

As a result, you will feel that the furnace is leaking water. 

There are several reasons behind a frozen coil, for example:

  • Dirty air filter: A dirty filter blocks the airflow. Without enough warm air, the coil will freeze. Either replace the filter or wash it every 3 to 4 months.
  • Closed or blocked vents: Blocked vents, too, will block the airflow and freeze the coil, leading to leakages. Keep the vents open and clear.
  • Refrigerant leak: Refrigerant fluid releases cool air and makes your room comfortable in the summer. If the fluid level drops, the system cannot release hot air, freezing the evaporator coil. You need an HVAC expert to repair or replace the refrigerant tank.

Other furnaces behind leaking water

Despite these reasons, there are some other that could happen with all types of furnaces:

10. Dirty air filter

A dirty air filter in the furnace blocks adequate airflow. 

As a result, the furnace will overwork to give you the desired heat and overheat. 

Your furnace will not be able to run for a very long time and will end up with an explosion. 

However, a dirty air filter does not directly cause water leakage. It will only happen if your furnace and air conditioner share the same ductwork.

Since most air conditioners have evaporator coils above the furnace, a dirty air filter will restrict the airflow, freezing the temperatures and accumulating moisture. 

When the air conditioner is off, the ice will melt and flow over or below the furnace, especially if the condensate pan is full. 

You can either clean the filter and put it back or replace it with a new one. Do this every 3 to 4 months. 

Filterbuy 20x20x1 Air Filter MERV 8 Dust Defense (4-pack), Pleated HVAC AC Furnace Air Filters Replacement from amazon is a good choice for your furnace air filter. 

Another is Filtrete 16x25x1, AC Furnace Air filter, Clean Living Basic Duct, 6-Pack. 

If the leakage is not solved by changing the filters, there might be another reason for which you need an HVAC expert’s help to figure it out. 

11. Problem with heat exchanger 

Heat exchangers are an important part of the furnace and combustion. 

The exchanger is a metal shield that prevents the exhaust gas of the combustion process from entering the ductwork.

Once the heat exchanger heats up, the metal will expand and cool.

It will again contract to return to its shape at room temperature. 

Over time, the constant usage will make the heat exchanger wear out and crack. 

Due to the crack, the furnace will leak water.

This water was supposed to drain through the condensate drain as an alternative path out of the unit.

Additionally, the carbon monoxide will enter and circulate your house, which can be quite life-threatening.

All the furnaces have a heat exchanger, but the high-efficiency units have two heat exchangers for the condensation to transfer from vapor to liquid and generate more heat. 

Both exchangers will require maintenance. 

Call an HVAC expert to repair or replace the heat exchanger. 

Other reasons

The reasons explained above are some of the major causes. 

Except for these, some other causes could lead to water leakage in your furnace, no matter the type.

12. Leaking humidifier

To fight the excessive dryness in the winter, some house owners install humidifiers in the heating system. 

The moisture will go through the humidifier every time. 

So, if it gets clogged or starts leaking, the furnace will look like it is leaking water. 

A dirty or clogged humidifier pad will also trap moisture and alter the indoor air. 

Bacteria and mold can build up inside the house and harm you and your family.

The reasons behind a leaking humidifier are:

  • Clogged water panel
  • Clogged humidifier drain line
  • Broken drain line
  • Faulty solenoid valve
  • High water pressure, above 125psi

If the humidifier leaks:

  • Check the water panel for blockage, as it can prevent the water from flowing out of the cabinet.
  • Check the humidifier’s drainage and use a wire to clear the blockage. 
  • Call an expert to fix the broken drain line and faulty solenoid valve, and adjust the humidifier’s water pressure.

13. External leak draining near the furnace

If you find a puddle of water under your furnace, the reason is an external source and not your unit, for example:

  • Basement furnaces have drainage and clean water pipes around them. If there is a plumbing leak in these pipes, water will flow under the furnace and appear as if it is leaking.
  • Appliances like washing machines and facilities like sinks in the basement may have loose drain hoses and leaks, for which the furnace area gets flooded. 
  • Plumbing leakages will drip water if the furnace is in the attic and contains pipes above the ceiling. It may look like furnace leakage.

Since the reason is an external source, you do not have to do anything with the furnace. 

Please find the right source and fix it yourself or call an HVAC professional.

Also check:

Final thoughts

A leaking furnace will not only cause panic but will also cause extensive and costly damage to your unit and floor.

Whenever you find a leakage in your furnace, turn off the unit’s main switch and switches at the breaker box immediately.

Please find out the reason behind it. 

All the reasons explained above are mostly the common reasons behind the leakage.

You can crosscheck these points to figure out the main problem. 

Though you can solve some issues yourself, always call an HVAC expert to confirm and fix the problem if you have exhausted the simple solutions. 

FAQs

How much will it cost to fix a leaking furnace?

The cost to fix the leaking furnaces depends on the type of reason and damage level. 

It could be a minor problem like air filters or secondary heat exchangers or a serious issue like a leaking humidifier. 

The cost can vary based on the location.

For a better pricing idea, contact a local technician to find the exact range for your region.

Reference: Wikipedia.

25 Reasons Your Furnace Is Making Noise (Different Noises+Fix)

Written by Arthur Smith in Furnaces and Boilers,HVAC 

Any electrical material will make some noises during operation. Similarly, it is common for a furnace to make a low noise when operating. But, the problem occurs when you hear loud, alarming noises from the unit. 

Noisy furnaces indicate a faulty blower motor or heat exchanger, dirty burners, loose furnace parts, faulty transformers, or bad inducers. Buzzing, banging, chirping, rattling, and whistling are common noise types. If you notice any irregular noise, you should check for possible problems.

The number of reasons and noise type is more. This guide will explore the different noise types and the reasons behind them. We will also share a few preventive measures to avoid the noise. 

Rubbing noises

Common reasons include the following:

1. Loose blower wheel 

A blower wheel is a part of the blower motor. 

It moves the warm air into the ducts of your house. 

The blower wheel may disconnect from the motor shaft due to dirt buildup in the air filters and release a loud rubbing noise. 

The dirt moves towards the blower wheel, and the wheels rub against each other’s internal parts. 

The wheel struggles to release the warm air out of your furnace. 

The strain will detach the wheel from the motor shaft and create a rubbing noise. 

Solution 

  • Turn off the furnace and open the blower chamber.
  • Find the blower wheel and tighten any loose screws at the blower shaft. 
  • Close the chamber and turn on your furnace. 

Wait for some time to see if the furnace works. Otherwise, call an HVAC expert. 

2. Broken blower wheel 

While checking the blower wheel for loose connections, unscrew the wheel from the shaft and check it thoroughly for damages. 

A broken wheel could also make rubbing noises. 

You must replace the wheel if it is cracked.

Solution 

You must hire an experienced HVAC expert to deal with this matter. 

The expert will analyze the system, find a suitable wheel, install it properly, and suggest ways to keep the new one in good condition. 

3. Worn-out blower motor bearings

The blower motor bearings on the shaft allow the armature to spin without friction.

The bearings will require annual lubrication. 

If the furnace overheats, the lubricant in the bearing will break down and make them rub against each other, creating a rubbing noise. 

Dirty air filters are another reason behind the overheating. 

Solution 

Lubricate the bearings every year. 

Use non-detergent motor oil for each port and the blower shafts too. 

Do not over-oil them. 

Some blowers will have grease cups instead of oil cups. 

Find the grease cups and refill them with a bearing lube. 

If the motor bearings have worn out too much, lubricate them slightly and keep them ready for replacement. 

Use only 10-weighted non-detergent motor oil for lubrication. 

Do not use more oil. Only 3 to 4 drops should suffice. 

Whistling, banging, and popping noises

A furnace could make banging and popping noises due to the following: 

4. Clogged or faulty air filter

Furnaces suck in the surrounding air to treat and release them as warm air. 

This air contains many dirt particles. 

The dirt particles get trapped in the filter when the furnace sucks them inside.  

Over time, the filter will become dirty, and you will receive less warm air. 

The filter will struggle to give you enough air and create a negative pressure in the ducts. 

Due to this, the furnace will have a whistling sound at first, which will progress to a banging or popping noise. 

The same occurs if your furnace filter is at fault, for example, broken or cracked somewhere. 

Solution 

To must clean or replace the furnace filters every 3 to 4 months. 

  • Turn off the furnace and open the door. 
  • Remove the filter to check its condition. 
  • Replace the filter with the new one. If it is reusable, wash and dry it, and again put it back in place. 
  • Check the direction of the arrows in the previous filter removal to maintain it after replacement. 
  • Once cleaned, close the furnace door and start the unit. 

Decide on the changing frequency based on the filter size. 

5. Wrong-size ducts

Your furnace will make banging noises due to incompatible parts, for example, ductwork. 

A wrong duct size will create pressure, and the unit will release a banging or popping noise. 

Sometimes, the furnace will release a whistling noise due to small ducts at the beginning. Slowly, it can progress to a banging or popping noise. 

Over time, the ducts will damage if you do not change them. 

Solution 

First, estimate the furnace size to get the right duct size. 

Also, examine the air pressure the furnace puts in the duct. 

If the pressure is too much:

  • Replace the furnace with a smaller unit. But this might reduce the airflow in your house. 
  • The second option is to replace the ducts with bigger ones. 

6. Dirty ductwork

When excessive dirt collects in the ductwork, you hear a banging noise from your furnace unit.  

This dust will end up inside your house, and your family will experience breathing issues and allergies. 

It is more dangerous for people with lung disease and asthma. 

Solution 

Remove the duck panels and clean them one by one with the help of a brush. Use a toothbrush for the corners.

After cleaning, fasten all the panels tightly. Loose panels may cause flapping noises. 

7. Poor ductwork insulation 

Ductwork is crucial for the HVAC system. 

It has lines and vents through which the air is pushed from the furnace and spread into the rooms. 

Insulation is necessary to prevent the air from escaping so that your house receives enough airflow. 

Problems in the insulation or no insulation will weaken the ducts and allow the air to escape, releasing a popping noise. 

Solution 

First, ensure the problem by walking along the duct lines and vents. 

It will let you know whether the air is escaping or not. 

Call an HVAC expert to insulate the ductwork if you haven’t already. 

If there is already insulation, but the air escapes (a popping sound confirms it), find the problem and reinstall the insulation. 

You can use duct tape to keep the insulation in place.

8. Air escaping from the unit

Air escapes due to loose duct connections, increased air pressure, or loose register cover.

Air escaping can reduce heat efficiency and airflow and increase energy bills. 

Solution 

I have already shared about the ductwork in the previous points. 

If the reason is increased air pressure, reduce the fan speed. 

If the reason is a loose register cover, tighten the screws to secure the cover well.

9. Delayed ignition

When the ignition is delayed, the banging noise will come directly from the furnace during the ignition process. 

The gas released into the unit produces fuel for the ignition. 

The gas will gather in the combustion chamber when the ignition is late. 

As a result, a large volume of gas will make a loud banging noise. 

Address the problem immediately to prevent a mini-explosion inside the furnace. 

Solution

There are some reasons behind this delay:

  • Low gas pressure pushes gasses into the burners, allowing them to gather around the burners. 
  • A weak and dirty pilot light makes ignition harder, and the gas accumulates before burning. 
  • Dirty burners also accumulate gas before ignition, therefore delaying the process. 

Call an HVAC expert to deal with these problems.

10. Faulty gas supply valve

Excessive pressure is applied to the gas valve when the furnace runs. 

When the valves get damaged or loose, you will hear a whistling sound from your unit. 

Solution 

Check for loose connections or damage in the gas valves. 

If there are any of these problems, fix them first. 

If the valve becomes loose, tighten the screws. 

If the valve is broken, replace it with the help of an HVAC expert. 

While replacing, make sure that the furnace is off. 

Otherwise, the valve will flow the gas at high pressure. 

So, this can be dangerous. 

Buzzing noises

Buzzing noises are the result of the following reasons: 

11. Faulty wiring

In most cases, a buzzing noise means wire issues. 

A furnace will contain many electrical wires, for example, a power source connecting the furnace’s interior, control board area, blower assembly, thermostat, and several other areas. 

When a wire gets loose, you will hear a buzzing noise from your furnace.

Sometimes, it also indicates damage to the copper wire insulation. 

Another reason is bare wires touching each other. 

It also leads to fire hazards. 

Solution 

Access the furnace interior to check for loose wires:

  • Turn off the furnace. Unplug if possible. 
  • Open the furnace door and look inside the compartment, especially around the wires. Check for loose or frayed wires. 
  • Check the insulation of the wires. 

Call an HVAC expert to fix the problem. 

12. Problem with the capacitor

The capacitor is close to the motor and helps to start the motor. 

The capacitor is directly connected to the power source inside the furnace and will malfunction over time.

The capacitor may have several issues, like power surges, imbalance motor, etc. 

Whenever you turn on your furnace, you hear a buzzing sound. 

Solution 

Check the capacitor for visual damage and loose wires.  

If you find any loose wires, tighten them up. 

For any physical damage to the component, check for its mounting or displacement. 

Call a professional to test your capacitor with a multimeter if you still cannot find anything.

13. Faulty blower motor

The blower motor joins the capacitor to the blower fan. 

Problems in the connection will lead to a buzzing sound. 

A faulty or worn-out blower motor creates an endless buzzing or siren noise. 

Sometimes, you may also hear a squealing noise. 

You must confirm it by checking. 

Solution 

Check the motor to find out any wire issues or physical damages. 

Connect the motor to an external power source to check for the buzzing noise. Replace the motor with the help of an HVAC expert. 

14. Problem with the transformer

A transformer assures the starting of the furnace and regulates its voltage. 

A low voltage will hinder the furnace’s functionality, leading to insufficient heating and airflow. 

But when the voltage is too high, there will be electrical shortages and power surges, which can further damage the internal components and the control board. 

As a result, your unit will release a loud buzzing noise. 

Solution 

Determine the reason behind the noise to solve it:

  • The transformer allows too much voltage to pass to the furnace. You need an HVAC expert to check the transformer. 
  • The wires in the transformer are loose or faulty. Call an electrician to fix the wires. 
  • The box on the transformer is loose. Tightening the fastening will stop the noise. 

Chirping and squealing noises

A furnace makes a chirping or squealing noise due to loose motor mounts or worn-out fan belts and bearings.

15. Loose motor mounts

Check the inside of the furnace once to check the motor mounts. 

The mounts keep the motor in place and are fastened to the furnace’s housing with screws and bolts. 

If the mounts are loose, it will create a chirping or squealing noise in the unit. 

Solution 

  • Turn off the furnace at the breaker. 
  • Open the furnace door and look at the motor mounts. 
  • Wiggle the motor for loose mounts. 
  • Tighten the loose mount brackets, check the other mounts, close the furnace door, and start the unit. 

If you still can’t solve it, ask for help. 

16. Worn-out fan belts

Fan belts are used in the fan assemblies of the furnace to rotate the motor fans. 

Since these belts constantly run when the furnace heats the air, they can wear out over time. 

A worn-out belt becomes less efficient, reduces fan rotation, and decreases duct airflow. 

It will also create a chirping or squealing noise whenever the furnace runs. The noise increases when the belt continues wearing out. 

Solution 

  • Turn off the furnace. 
  • Open the main compartment to check the fan belts in all the motors. 
  • Look for damage signs like tears and holes. 
  • Check the thickness of the belt. 

If the belt becomes thin or has damage signs, call an HVAC to replace it. 

17. Worn-out bearings

The bearings help in the fan rotation and wear out over time. 

As a result, your unit produces a chirping noise. 

If you do not change the bearings, they will harm the motor assembly, and the sound will progress to squealing noise. 

Sometimes, you could also hear rattling noises from your furnace due to loose motor set screws.

Solution 

  • Turn off the furnace. 
  • Check the bearings inside the furnace in each motor. 
  • Look for wear-out and damage signs. 
  • Call an HVAC to replace them. 

Clicking or fluttering noises

A furnace will make a clicking noise if the heat exchanger has cracked. 

18. Cracked heat exchanger 

Heat exchangers are made of metal. 

They move the heat from combustion to the furnace. 

There will be cracks in the metal tube during constant heating and cooling. 

The clicking sound would be from the metal that heats the cracks, starts expanding, and pushes against the exchanger. 

A cracked exchanger will also leak carbon monoxide inside the house, which can be dangerous for your health. 

Solution 

If the exchanger is loose at the corner, tighten it correctly. 

Call an HVAC expert to fix the heat exchanger. 

Keep a carbon monoxide detector in your furnace room to get alarms about the CO leak. 

Rattling noises

The following reasons are responsible for the furnace’s rattling noise:

19. Dirty burners

When your furnace accumulates excessive dirt and debris in the burner, it will cause a rattling sound. 

The sound will be loud if you don’t clean your furnace for over a year. 

A dirty burner can also lead to a fluttering noise. 

Solution 

Check the blower and burner cavity for debris, and clean the blower fan and the back corners of the cavity.

Use a handheld, hose vacuum, or drain line to clean them. 

Once cleaned, turn on the furnace to check its functionality. 

20. Ducts wrapping and expanding

Periodic banging or rattling noise is due to the constant wrapping and expanding of the ducts after long-term use.

Though it is nothing stressful, the noise can be irritating. 

Clean ducts make more noise. 

The dirt and debris work as duct insulation. So, when you clean the ducts, the noise will be louder. 

Solution

Insulating the ducts will reduce the noise. 

21. Faulty draft inducer motor

The inducer motor clears the air in the heat exchanger and allows clean air inside the system. 

Sometimes, the motor will become imbalanced or faulty, and you will hear a rattling or tapping noise from your unit. 

When the inducer wears out, it will grow soot and make noise.

Solution 

You need to replace the inducer motor. 

Though you can do it yourself, it is best to hire an HVAC expert to replace it. 

Knocking noises

Cold weather straining the system causes knocking noises.

22. Cold weather

When you run a furnace in cold weather, a furnace works hard to give you the desired temperature. 

In the process, the cold weather will strain the furnace and its machinery, which can, later on, produce a knocking sound. 

The sound is normal and expected during low temperatures. 

How to understand that the cold weather is stressing the furnace?

When you turn on the furnace, it immediately makes a tapping or knocking sound. But, the sound will vanish after some time. 

There is no solution to this sound. 

The sound will stop after some time or when the weather becomes normal. 

Gurgling and dripping noises

Gurgling noises are mostly due to clogged drainage systems. 

23. Blocked condensate pipes

The furnace uses these pipes to flow the condensation out of the system during the heating process. 

If the pipes are blocked, the water pressure will increase in the condensate assembly, creating gurgling noises. 

Solution 

  • Turn off the furnace and remove the condensate pipes from the trap. 
  • Take the pipes out and run some water to look for blocked parts. 
  • Take the pipe apart to find the blockage. 
  • Remove the blockage and put the pipe back. 
  • Consult an HVAC if you cannot do it. 

24. Faulty condensate pump 

You hear a gurgling noise when the pump is at fault. 

The pump sucks the condensate water and sends it to drain outside the house through the pipes. 

If the pump is faulty, the liquid will increase, make its way into the furnace, and create a gurgling noise. 

If the water reaches the electronic parts, your furnace is at risk.

Solution 

In most cases, you need to replace the pump. 

Call an HVAC to replace it. 

25. A problem in the refrigerant line

The problem does not apply to the heating system containing only the furnace. 

Most houses have a full HVAC system comprising the furnace and AC. 

The refrigerant lines in the AC cool the air and dehumidify your room. 

Sometimes, the liquid gets stuck inside the line or leaks due to cracks. 

When you turn on the furnace, the unit’s heat will produce a gurgling sound. 

Solution 

Check the refrigerant lines carefully for rust, erosion, or cracks. 

Call an HVAC to fix it. 

The expert will remove the remaining liquid, replace the tube, and refill it. 

Make sure the tube is properly sealed. Otherwise, you will face the same problem. 

Normal noises from the furnace

  • Popping sounds from the ducts are due to the recent cleaning. 
  • A brief click during the starting of the furnace is due to the starting of the heating cycle.
  • Chirping noises at the beginning of the heating season are because you started the unit after a long time. Dust builds up in your unit when you keep it off in summer. The noise will fade after a few days of running.

Also check:

How to prevent furnace problems?

  • Clean or replace the air filters every 3 to 4 months. 
  • Clean the airflow obstructions.
  • Perform regular maintenance of the furnace every year.

Final thoughts

A furnace makes various other noises than those mentioned in this article, like groaning, rumbling, roaring, growling, etc. 

But the reasons are the same. 

So, you need to identify the noise, find the cause, and troubleshoot the problem.

If you are confused about it, call an HVAC expert to deal with it. 

Reference: Wikipedia.