A screw or bolt may have come loose.
How to repair attic fan.
Some attic fan repair problems are relatively simple and can be done without the help of a professional.
If however the fan still doesn t turn on the problem is most likely with the fan motor or the thermostat.
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.
Sometimes cleaning out your fan and or adding some oil is all it takes to correct a problem.
It s best to hire an electrician to deal with electrical problems.
Your belt might have deteriorated to the point where it is slipping and not turning the blade effectively.
If the fan comes on you have an electrical problem in the circuit the attic fan is on.
Most fans have an on off switch that bypasses the fan s thermostat.
You can start by checking the fan for debris and making sure that your fan s motor is properly lubricated.