You can start by checking the fan for debris and making sure that your fan s motor is properly lubricated.
How to repair attic fan.
This attic fan motor is the most expensive repair for attic exhaust fans.
Most fans have an on off switch that bypasses the fan s thermostat.
If the fan comes on you have an electrical problem in the circuit the attic fan is on.
If however the fan still doesn t turn on the problem is most likely with the fan motor or the thermostat.
Sometimes cleaning out your fan and or adding some oil is all it takes to correct a problem.
If the motor isn t working you will need an attic fan motor replacement or attic replacement fan.
After you realize that it s not an electrical or thermostat problem the chances of it being a problem with the motor are quite high.
Some attic fan repair problems are relatively simple and can be done without the help of a professional.
A screw or bolt may have come loose.