Note down the temperature settings for later reference.
How to test attic fan thermostat.
Switch off the power of the attic fan and remove the power cord.
Locate the thermostat casing and open it using a screwdriver.
If the fan turns on the motor is still good.
Step 2 test the thermostat.
Also note down the power rating and the fan capacity in cubic feet per minute.
Once done test that the motor still works by plugging the motor into an extension cord that is connected to an outlet.