How To Test Attic Fan

Most fans have an on off switch that bypasses the fan s thermostat.

How to test attic fan.

If the fan turns on the motor is still good. Attic fan thermostat if your fan has a thermostat turn the fan on and off bypassing 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. If the fan comes on you have an electrical problem in the circuit the attic fan is on.

The cost of repairing the thermostat depends on the cause of the attic exhaust fan problem. 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. If however the fan still doesn t turn on the problem is most likely with the fan motor or the thermostat.

Now is the time to test the white brown and white wires. Also check the wire connections at the fan at an electrical junction or at an outlet box. The white wire is called the run wire. If the fan comes on you know that the problem lies with the fan thermostat.

Also note down the power rating and the fan capacity in cubic feet per minute. 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. Take your multimeter and set it to ohms.

Test the first set of wires. It s best to hire an electrician to deal with electrical problems. Step 2 test the thermostat. Once done test that the motor still works by plugging the motor into an extension cord that is connected to an outlet.