A furnace blower motor can be replaced by a handy DIY homeowner which can save money.
Of course, if in-doubt be sure to call a professional HVAC technician.
A new motor and capacitor will need to be bought to replace the old unit.
Most hardware stores will not carry a furnace motor but a new unit can be bought easily online on Amazon or eBay.
Example Furnace Blower Motor on Amazon
A1588, 1/2HP 230V Air Handler Motor, 1075RPM, 3.2AMP
Read Here For How To Buy a New Furnace Blower Motor and Capacitor
How To Replace a Furnace Blower Motor and Capacitor
- Turn the power off to the furnace.
- Locate the furnace blower motor.
- Locate the Furnace Capacitor.
- Take pictures of the blower motor and capacitor.
- Remove the blower motor assembly.
- Remove the fan blades.
- Remove blower motor bracket.
- Bolt the fan blades back into place.
- Install the new capacitor.
- Double check the assembly.
- Install the assembly back into the furnace.
- Tighten the bolt holding the assembly in place.
- Reattach the wiring.
- Test the blower motor.
Be sure to turn off the power to the furnace or unplug it before any work is done to a motor or any components.
The first step is to locate the motor which is the only large motor in the furnace.
Look for a Start or RUN Capacitor since this will also have to be changed (if the furnace has one). A bad or failing capacitor can damage a new motor so it must be changed any time a new motor is installed.
Some furnaces don’t have a RUN or Start capacitor which can vary between units.
Before anything is removed or any work done take pictures and write down all the wiring and connections.
Take good pictures or a video to refer back to later if needed. If something is wired wrong the motor may burn up or at the very least not work. Having pictures to look back at can be invaluable when reconnecting everything.
Once you have good pictures of the wiring, the wires can be unplugged and removed.
The motor will be inside of a sheet metal assembly making it necessary to remove the entire assembly.
Screws holding it in are usually located in the front with a notch in the back it can slide out of.
To remove it loosen it up so that the shaft can pull out from the fan blades. It is a good idea to oil up the end of the shaft so it pulls out easier as some can be a pain. If there is any rust or build up on the shaft use sandpaper to remove it then oil it. Otherwise pulling a motor from the fan blades can be very hard sometimes.
Next, the bolts holding the back of the blower motor should be removed and the motor pulled from the fan blades.
On a side note, it is a good idea to clean the fan blades when the assembly is out. Debris build up on fan blades make them work less efficiently cleaning them is always a good idea. If the fan blades are really dirty take them to a car wash and after spraying them with de-greaser power wash them.
The motor will have a ring that goes around it and bolts to the housing, this should be taken off the old motor and put one the new one. In some cases it can be damaged if it has been a new one can be bought.
Once the ring has been placed on the new motor the shaft can be slid back on to the fan blades and bolted into place.
Example Replacement Furnace Motor Bracket On Amazon.
Dayton Motor Mtg Bracket, 3-Ring, Anodized Steel – 2MEV2
Before installing the assembly back into the furnace be sure the fan blades spin without hitting the housing.
After getting the assembly back in double check the fan blades again for proper spinning. You don’t want to damage anything when power is applied and they spin fast.
Turn the power back on. It is always a good idea to double check everything before turning the power back on.
Once the power is back on and the thermostat set the furnace should kick on and blower motor spinning.