Step 2 test the thermostat.
How to tell attic fan is going bad.
Check for tripped breakers.
If the fan turns on the motor is still good.
This is important because excess heat in the attic will cause damage to roofing material and to the home s siding.
How to check if your ac fan motor is bad in 7 steps.
The fan won t stop even when you shut the ac off.
The replacement is quite simple and straightforward.
Signs that your fan is having issues include the following.
With an attic fan many attics have a temperature that is the same as the outside air or just a few degrees warmer.
Is the thermostat on.
Make sure the thermostat is turned on.
The temperature in attics without attic fans can climb to as high as 150 degrees f.
Step 1 test the fan motor.
Ensure the thermostat is on.
If you notice that the attic fan is not switching on or off according to temperature variation it indicates that the thermostat is no longer functioning properly.
Locate the thermostat casing and open it using a screwdriver.
Moreover if you have asphalt shingles on the roof attic.
The fan turns on yet the blades are rotating very slowly.
Turn the attic fan off and unplug the motor from the thermostat.
Your attic fan may not be turning on because of an electrical problem like a tripped circuit breaker a blown fuse or a bad connection.
How to check attic ventilation.
To avoid rotting wood clumping insulation and mold your attic needs to be properly ventilated.
Once done test that the motor still works by plugging the motor into an extension cord that is connected to an outlet.
You can diagnose it by plugging other electrical appliances that are working into the same outlet and by plugging the fan into a different power outlet.
The fan won t start even though the ac is on.