Common Furnace Problems and Repairs


Since we are in this lovely season of winter our furnace is getting a lot of use. From all of this use our furnace may be having some problems that need to be fixed ASAP because we do not want our homes to be the same temperature it is outside. If your looking to buy a new furnace here are some things you should look at when purchasing and if you are looking to repair your furnace here are some common furnace problems and how to repair them!

Things to look at when buying a new furnace:
-The number of speeds it has
-The type of drive it has it will either be direct or belt
-The speed in RPM’s and the number of speeds it has
-The voltage you probably will want a furnace with 115,208-230, or 460
-The direction of rotation; reversible seems to be the better choice
-The horse power you will probably want one with 1/4, 1/3, 1/2, 3/4, or  1


Dirty Filters: Dirty filters can be replaced very easily on a furnace but if not replaced can cause damage on other parts of the furnace that may not be so easy to replace.  You should be able to easily tell if our filter needs replacing if you can no longer see light when looking at your furnace filter.

Tools needed to replace your filter:
New Filter

Steps to replacing your furnace filter:
1.)Turn off the furnace
2.)Locate the service panel and remove it
3.)Slide out the old filer
4.)Slide in the new filter
5.)Put the service panel back on and turn on the furnace.

Electric ignition problems: If you have a damaged ignition it can make it extremely difficult for your furnace to heat your home. One of the symptoms of your electric ignition needing replacing is if your your home is not being heated to your standards.

Tools needed to replace your electric ignitor:
New ignitor or  ignitor kit
-screw driver

Steps to replacing your furnaces electric ignitor:
1.)Turn off your furnace
2.)Disconnect the wires that go to the ignitor (on a hot surface ignition system the wires are usually in a plastic plug and socket; on a spark ignitor system usually there is only one wire and it will snapp into the ignitor or ignitor module)
3.)Remove the mounting screws and old ignitor
4.)Reinstall the new ignitor and mounting screws
5.)Reconnect the wire or wires
6.)Turn the power back on

Pilot control/pilot control board problems: If your pilot control board is not working how it should be it can be hard for just about any part of your furnace to function properly. A sign that you need to replace your pilot control/pilot control board is if the pilot light is not lit or if your furnace isn’t heating as you expect.

Tools needed to replace pilot control board:
New control or pilot control kits
-screw driver

Steps to replacing your pilot control/pilot control board:
1.)Turn off Your furnace
2.) On a piece of paper write down where each wire connects on the board so you can ensure proper connection when reconnecting.
3.) Remove the wires
4.) The control board will either be held in place by plastic clips or screws; remove the plastic clips or screws from the old board and remove the old board
5.) Attach your new board with the plastic clips or screws
6.) Reconnect the wires to the correct area on the control board
7.)Turn your furnace back on

Fan and fan motor problems: Fan or fan motor problem can cause your furnace to not heat correctly, blow dust into the air, or be extremely noisy or rattle. If your experiencing any of these symptoms it my be time to replace your fan motor.

Tools needed to replace your motor:
A new motor
-screw driver
-nut driver
Steps to removing your old fan blower motor and installing your new blower motor:
1.)Turn furnace power off
2.) On a piece of paper write down what the color is of each wire and where each wire connects to ensure proper re-connection then remove the wires
3.)Remove the nuts, screws, or bolts that connect the blower assembly to the furnace
4.)Remove the blower assembly from the furnace
5.)To remove the motor from the blower assembly, loosen the screws that hold the wheel to the motor. Then remove the mounting bolts, nuts, or screws that attach the motor to the motor housing, now you will be able to pull the old motor out of the motor housing.
6.) Remove the mounting bracket attached to the old motor and remember the position of the bracket to the motor.
7.) Attach the mounting bracket to the new motor
9.)Reattach the motor to the motor housing
10.)Re-screw the wheel back onto the motor
11.) Reconnect the blower assembly to the furnace
12.) Reconnect the wires make sure you connect each wire to its proper place
13.)Turn the power back on

*WARNING: Before starting any repair, always make sure that the appliance is completely disconnected from the power source by unplugging it.  This tutorial is meant to be a guide and should not be used in place of the installation instructions provided by the manufacturer.

Thanks for reading!  If you found this post helpful, be sure to like & share it with a friend.  As always, feel free to leave any additional tips, questions for us, or ideas for blogs you’d like to see in the comment section below.

Written By: Claire Begalke

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