Step 2 test the thermostat.
How to test attic fan thermostat.
Locate the thermostat casing and open it using a screwdriver.
Note down the wiring before proceeding to remove it.
Note down the temperature settings for later reference.
If the fan turns on the motor is still good.
Switch off the power of the attic fan and remove the power cord.
Also note down the power rating and the fan capacity in cubic feet per minute.