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.
Fixing attic fan from inside.
Walk carefully on the ceiling joists in the attic or use a sheet of plywood to walk on so you will not accidentally put a hole in the ceiling panel.
After that different parts get worn down and require fixing or replacement.
Get a quieter attic fan.
Look inside your attic for mold and rotted sheathing.
Perhaps you don t feel like repairing it or you can t find the right parts either.
If the attic floor doesn t have a solid surface for you to walk on put enough 2 by 12 boards into the attic opening to create a walkway to use to get to the gable vents.
If the motor isn t working you will need an attic fan motor replacement or attic replacement fan.
This attic fan motor is the most expensive repair for attic exhaust fans.
Professional installation will run an added 80 to 100 per hour.
Open the attic access door.
A blower door test performed by a professional company can help detect air leaks if visual signs are not apparent.
Repairing a roof leak from the inside is a temporary fix only.
The last remaining option is to replace your attic fan with a new and quieter model.