Testing An Attic Fan

It is preferable to do this test without the moving blade.

Testing an attic fan. 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. If there s a problem with the belt replace it with a new one. You may need to replace a circuit breaker an electrical outlet or one of the wire connections. Look for movement of the needle on the meter toward infinite ohms.

Turn the attic fan off and unplug the motor from the thermostat. They include rafters and ceiling joists that are damp or blackened with mold. Place the leads of the ohm meter on the wires that run from the capacitor to the motor. If the fan turns on the motor is still good.

Place the black probe on the white wire. Step 2 test the thermostat. The cause of the problem could be the belt. Locate the thermostat casing and open it using a screwdriver.

Fan motor runs but not the blades if the motor is working but the fan blades are not moving the problem may be the belt. Count to three while the leads on the meter charge the capacitor. Switch off the power of the attic fan and remove the power cord. Note down the wiring before proceeding to remove it.

Inspect the attic if your attic is not sufficiently vented you probably won t have to look very hard to find signs. One static vent style is the turbine vent which uses wind to power its enclosed fan all it takes is a light breeze to rotate the blades and suck heat out of the attic view example on the home. Once done test that the motor still works by plugging the motor into an extension cord that is connected to an outlet. Reverse the leads on the capacitor.

Step 1 test the fan motor. Sometimes you face an issue where the attic fan s motor comes on but the fan blades don t move.