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How to replace a furnace blower motor

This page will help you replace your blower motor on your forced air furnace. The first thing you need to know is, this can be dangerous, you can be injured, you can loose your fingers, you can be electrocuted, you can be burned and you can be killed, you can also burn your house down, Master Plumber USA, and Thomas P. Reardon can not be held reasonable for anything that may happen as a result of you following the instructions on this and any other page on this website, You assume full responsibility for what you do. It is always best to have a professional do this kind of work for you. Now make sure the power to the furnace is off, just because it is not running, does not mean the power is off, just turning the thermostat down does not mean the power is off, Make sure the power is off at the circuit breaker, or the fuse is removed. I have found that 90 percent of the time circuit breakers and fuses are marked wrong in the panel box, use a meter and make sure the power is off.
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Blower Motor 1This is an old Lennox furnace with a spark ignition that is built in to the gas valve.
I can not give any instructions on how to troubleshoot this gas valve.
If you have a furnace like this and need help with the gas valve of ignition, call a professional.
Blower Motor 2The motor on this furnace burned out, it is not always apparent why a motor burns out, but in this case it is a safe bet it burned out because of neglect. People seem to be under the impression, a gas fired furnace never needs to be cleaned or serviced, this is a big mistake that can cause a very dangerous situation. All furnaces gas or oil need to be inspected and serviced every year.
Blower Motor 3This is the blower motor compartment. In this furnace the filter is located in the blower motor compartment. The blue thing shaped like a U is the filter. you may notice how dirty it is. A filter needs to be cleaned or replaced every month, not cleaning or replacing the filter as often as you should, shortens the life of the furnace, the controls and the blower motor, not to mention it cuts down your efficiency.
Blower Motor 4This is just a close up of the gas valve. behind the gas valve is the cam stat. The cam stat controls when the furnace fires, stops firing and turns the blower on and off.
Blower Motor 5OK, now it is time to cut some wires, Are you sure the power is off, and no one in the house will turn it back on? This furnace has a 3 speed motor, others have only a single speed motor, some have a 3 speed motor but only use one of the speeds. You want to cut the wires going to the motor, cut close to the motor, so that you have as much wire left going back to the control as possible. make sure you are only cutting wires that go into the blower motor, many blower motor compartments have a high limit switch. you do not want to cut the wires.
Blower Motor 6aThe whole squirrel cage housing needs to be removed, on most furnaces there are 2 bolts one on either side that need to be removed. Some are on the bottom others are on the top, this one is mounted to the top. Care needs to be taken not to have the whole thing just drop.
Blower Motor 6Blower Motor 7Unfortunately this electrical box is in my way, and will have to be removed in order to get the squirrel cage housing out, please see the following pictures.
Blower Motor 8bBlower Motor 8aNote the screws need to be removed from the top I have a flexible drill bit extension with a magnetic nut driver on it, it makes getting at the screw heads allot easer.
Blower Motor 8cBlower Motor 9Now with the box hanging I can pull the squirrel cage housing out and just push the loose wire box out of the way. You do not need to remove the box and all the wires.
Blower Motor aOnce I got it out and set it on the floor, it this very small room, I can see just how dirty this furnace really is by looking at the following pictures you will see what happens when you don't have your furnace inspected and serviced every year.

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