How To Repair Attic Fan Motor

Remove the mounting bolts that hold the motor onto the steel flange.

How to repair attic fan motor.

Tap the motor a few times with the handle end of a hammer or piece of wood as if you were swatting a bug. It s best to hire an electrician to deal with electrical problems. You ll need to take out the outer casing of the fan and look to see if the belt is cracked sagging worn out or broken. Most fans have an on off switch that bypasses the fan s thermostat.

Some motor plates release by pressing or prying on the side of the fan housing. Using wire strippers strip the ends of the wires that you cut when you removed the old attic exhaust fan motor. The bolts may be attached to the fan motor itself. Sometimes you face an issue where the attic fan s motor comes on but the fan blades don t move.

Remove this by taking off the wires making a note of which ones belong where and unscrewing the motor from the base. If however the fan still doesn t turn on the problem is most likely with the fan motor or the thermostat. Spray some lubricant wd 40 or similar into the air ports at the top bottom of the air holes in the fan housing for about 3 to 5 seconds. If there s a problem with the belt replace it with a new one.

A fan that won t run is often caused by a failed motor or a bad thermostat. Take your new motor and place it into the fan. Match the colors of the wires and then twist the ends of the bare wires together. Then unplug the fan and remove the motor plate photo 2.

Shield the twisted wiring connections with wire caps. Others are secured with a screw or two. Take off the back using the screwdriver and locate the attic fan motor. How to test an attic fan motor and thermostat.

Alternatively there will be a bracket that holds the motor in place. If the fan comes on you have an electrical problem in the circuit the attic fan is on. Fix the wires into the correct positions using your pair of pliers. With fan off go into the attic.

Turn off the power to the fan at the main breaker panel.