How To Test Attic Fan

Also check the wire connections at the fan at an electrical junction or at an outlet box.

How to test attic fan.

You simply add up the nfas of all your vents and divide that number by the area of the attic to determine whether you re within the 1 150 ratio. Turn the attic fan off and unplug the motor from the thermostat. If however the fan still doesn t turn on the problem is most likely with the fan motor or the thermostat. The white wire is called the run wire.

Now is the time to test the white brown and white wires. Test the first set of wires. Step 2 test the thermostat. The cost of repairing the thermostat depends on the cause of the attic exhaust fan problem.

Attic fan thermostat if your fan has a thermostat turn the fan on and off bypassing the thermostat. Take your multimeter and set it to ohms. If the fan turns on the motor is still good. Most fans have an on off switch that bypasses the fan s thermostat.

If it automatically trips again after resetting it you may have a short in the wires along the circuit. If the fan comes on you know that the problem lies with the fan thermostat. Step 1 test the fan motor. If the attic fan is plugged into an outlet use a voltmeter to make sure that the outlet is working.

Switch off the power of the attic fan and remove the power cord. Once done test that the motor still works by plugging the motor into an extension cord that is connected to an outlet. Note down the temperature settings for later reference. Locate the thermostat casing and open it using a screwdriver.