How To Test Attic Fan

If the fan comes on you have an electrical problem in the circuit the attic fan is on.

How to test attic fan.

Step 1 test the fan motor. If the fan turns on the motor is still good. Turn the attic fan off and unplug the motor from the 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.

The white wire is called the run wire. If however the fan still doesn t turn on the problem is most likely with the fan motor or the thermostat. Also note down the power rating and the fan capacity in cubic feet per minute. Attic fan thermostat if your fan has a thermostat turn the fan on and off bypassing the thermostat.

Note down the temperature settings for later reference. Locate the thermostat casing and open it using a screwdriver. If the attic fan is plugged into an outlet use a voltmeter to make sure that the outlet is working. Once done test that the motor still works by plugging the motor into an extension cord that is connected to an outlet.

It s best to hire an electrician to deal with electrical problems. Switch off the power of the attic fan and remove the power cord. The cost of repairing the thermostat depends on the cause of the attic exhaust fan problem. Step 2 test the thermostat.

Now is the time to test the white brown and white wires. If the fan comes on you know that the problem lies with the fan thermostat. Also check the wire connections at the fan at an electrical junction or at an outlet box. Most fans have an on off switch that bypasses the fan s thermostat.