see this causes and fix it .God bless you
Exhaust Fan Motor
If the exhaust fan does not run the fan motor
might be bad. Remove the fan motor from the microwave oven and see if
the blades can be turned by hand. They should turn very freely, if
they're stiff the fan motor will need to be replaced. The fan motor can
also burn out. To test this use an Ohm meter. The motor should have
continuity. If it does
Thermostat
If the microwave exhaust fan is not working
the thermostat might be defective. The thermostat senses the air
temperature and turns on the fan as needed, if it's defective it won't
turn on the fan. Watch our video on testing thermostats.
Main Control Board
If the microwave exhaust fan is not working
check the exhaust fan motor and wiring. If they are good the main
control board might be defective.
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