How To Test Attic Fan

Test the first set of wires.

How to test attic fan. Now is the time to test the white brown and white wires. If the fan turns on the motor is still good. Once done test that the motor still works by plugging the motor into an extension cord that is connected to an outlet. Step 2 test the thermostat.

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. Locate the thermostat casing and open it using a screwdriver. If it automatically trips again after resetting it you may have a short in the wires along the circuit.

Also note down the power rating and the fan capacity in cubic feet per minute. Switch off the power of the attic fan and remove the power cord. If the fan comes on you know that the problem lies with the fan thermostat. 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.

It s best to hire an electrician to deal with electrical problems. The white wire is called the run wire. Note down the temperature settings for later reference. If the attic fan is plugged into an outlet use a voltmeter to make sure that the outlet is working.

Step 1 test the fan motor. The cost of repairing the thermostat depends on the cause of the attic exhaust fan problem. If however the fan still doesn t turn on the problem is most likely with the fan motor or the thermostat. If the fan comes on you have an electrical problem in the circuit the attic fan is on.