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Microwave exhaust fan not working

01 - Microwave Exhaust Fan Motor
To determine if the fan motor is defective, remove the fan motor from the microwave and try turning the fan blades by hand. If the blades do not turn freely, replace the fan motor. If the fan blades do turn freely, use a multimeter to test the motor for incoming power and for continuity. If the motor has power but won’t run, replace it. If the motor does not have continuity, replace it.
Required Part
Microwave Exhaust Fan Motor
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Most Common Solution
02 - Microwave Thermostat
The thermostat monitors the air temperature and turns on the fan when necessary. If the thermostat is defective, it won’t turn on the exhaust fan at all. Use a multimeter to test the thermostat for continuity. If the thermostat does not have continuity, replace it.
Required Part
Microwave Thermostat
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Most Common Solution
03 - Microwave Main Control Board
The main control board might be defective. However, this is not usually the case. Before replacing the control board, first check the exhaust fan motor and wiring. If the exhaust fan motor is not getting power, the main control board might be at fault.
Required Part
Microwave Main Control Board
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Common Solution
04 - Microwave Control Board
If the exhaust fan indicator comes on when the fan button is pressed on the control panel, but you've determined that power is not reaching the fan motor, then it's likely the control board is defective and should be replaced.
Required Part
Microwave Control Board
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Common Solution
05 - Microwave Touchpad and Control Panel
If the exhaust fan indicator doesn't come on when the fan touchpad button is pressed on the control panel, it's likely the touchpad and control panel assembly is malfunctioning and should be replaced.
Required Part
Microwave Touchpad and Control Panel
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Common Solution
06 - Microwave Touchpad
If the exhaust fan indicator doesn't come on when the fan touchpad button is pressed, it's likely the touchpad is malfunctioning and should be replaced.
Required Part
Microwave Touchpad
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Common Solution

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