How To Tell Attic Fan Is Going Bad

Turn the attic fan off and unplug the motor from the thermostat. Moreover if you have asphalt shingles on the roof attic. There s a rattling noise coming from the condenser unit when the fan is turned on.

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Signs that your fan is having issues include the following.

How to tell attic fan is going bad.

The fan won t start even though the ac is on. Is the thermostat on. Ensure the thermostat is on. How to check if your ac fan motor is bad in 7 steps.

The replacement is quite simple and straightforward. This is important because excess heat in the attic will cause damage to roofing material and to the home s siding. The fan turns on yet the blades are rotating very slowly. It s one of the main culprits.

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. To avoid rotting wood clumping insulation and mold your attic needs to be properly ventilated. Step 1 test the fan motor. The fan won t stop even when you shut the ac off.

Locate the thermostat casing and open it using a screwdriver. Make sure the thermostat is turned 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. The temperature in attics without attic fans can climb to as high as 150 degrees f.

Step 2 test the thermostat. Check for tripped breakers. How to check attic ventilation. 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.

With an attic fan many attics have a temperature that is the same as the outside air or just a few degrees warmer. Once done test that the motor still works by plugging the motor into an extension cord that is connected to an outlet. If the fan turns on the motor is still good. Switch off the power of the attic fan and remove the power cord.