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Sharp Microwave exhaust fan not working

If your Sharp over-the-range microwave exhaust fan is not working, start with the door switch, which may fail to signal the control board that the door is closed. Test the door switch for continuity and replace it if defective. Next, check the exhaust fan motor. The fan blades should turn freely by hand; if they do not, replace the motor. If the motor turns freely, test it for incoming power and continuity. A defective thermostat can also prevent the exhaust fan from turning on, so test it and replace it if it lacks continuity. Inspect the grille for clogs or damage that could restrict airflow. If the motor is not receiving power, the control module may be faulty, although it is less common. Also test the microwave micro switch, which can cause the same door-signal problem. Enter your Sharp microwave model number to find the exact replacement exhaust fan motor, door switch, thermostat, grille, or control module for your appliance. Any repair requiring removal of the outer cabinet requires caution because the high-voltage capacitor can store a lethal charge even after the microwave is unplugged. Properly discharge the capacitor before interior work, or contact a qualified technician if you are not familiar with that procedure.

01 - Sharp Microwave Door Switch

A defective door switch may not signal the control board that the door is closed, which can prevent the button that controls the exhaust fan from functioning. To determine if any of the door switches are defective, use a multimeter to test each of the switches for continuity. If any of the door switches do not have continuity, the switch or switches should be replaced.
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02 - Sharp 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.
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03 - Sharp 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.
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04 - Sharp Microwave Grille

A damaged or clogged grille can prevent the air from being properly exhausted when the exhaust fan is turned on. Confirm the grille is free of obstruction and, if the grille is visibly damaged, replace the component with a new one.
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Highly Likely

05 - Sharp Microwave Control Module

If the microwave exhaust fan is not working, the control module might be defective. However, this is not usually the case. Before replacing the control module, first check the exhaust fan motor and wiring. If the exhaust fan motor is not getting power, the control module might be at fault and require replacement.
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Common

06 - Sharp Microwave Micro Switch

A defective micro switch may not signal the control board that the door is closed, which can prevent the button that controls the exhaust fan from functioning. To determine if any of the micro switches are defective, use a multimeter to test each of the switches for continuity. If any of the switches do not have continuity, the switch or switches should be replaced.
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Common

07 - Sharp 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.
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Common

Frequently Asked Questions

Why is my Sharp microwave exhaust fan not working?
Can a Sharp microwave door switch stop the exhaust fan from working?
How do I test the thermostat and grille when my microwave fan is not working?
Should I replace the Sharp microwave control module if the exhaust fan will not turn on?
How do I find the correct Sharp microwave exhaust fan part?