How To Repair Attic Fan Motor

Shield the twisted wiring connections with wire caps.

How to repair attic fan motor. A fan that won t run is often caused by a failed motor or a bad thermostat. How to test an attic fan motor and thermostat. The cause of the problem could be the belt. With fan off go into the attic.

Using wire strippers strip the ends of the wires that you cut when you removed the old attic exhaust fan motor. If the fan comes on you have an electrical problem in the circuit the attic fan is on. The bolts may be attached to the fan motor itself. Take your new motor and place it into the fan.

Remove the mounting bolts that hold the motor onto the steel flange. Take off the back using the screwdriver and locate the attic fan motor. It s best to hire an electrician to deal with electrical problems. Others are secured with a screw or two.

Tap the motor a few times with the handle end of a hammer or piece of wood as if you were swatting a bug. Step 2 add the new motor. 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. Sometimes you face an issue where the attic fan s motor comes on but the fan blades don t move.

Most fans have an on off switch that bypasses the fan s thermostat. Next strip the ends of the wires of the new motor. Turn off the power to the fan at the main breaker panel. Fix the wires into the correct positions using your pair of pliers.

Some motor plates release by pressing or prying on the side of the fan housing. Remove this by taking off the wires making a note of which ones belong where and unscrewing the motor from the base. Match the colors of the wires and then twist the ends of the bare wires together. 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.

Then unplug the fan and remove the motor plate photo 2.