Unlock the Right Part
for Your Repair
Find the exact part you need
Enter your model number to see parts that fit your machine.
Price Match Guarantee
In-stock parts ship the same day
365-Day Return Policy
Price Match GuaranteeChoose Product
Identify Problem
03
Find Solutions
HomeRepair HelpThermador Microwave RepairThermador Microwave exhaust fan not working Repair
Thermador Microwave exhaust fan not working
If your Thermador microwave exhaust fan is not working, start with the door switch, the most likely cause. A defective door switch, including a primary, secondary, or monitor switch, may fail to signal the control board that the door is closed, preventing the fan button from operating. Test each switch for continuity and replace any switch that fails. Next, check the exhaust fan motor. Make sure the fan blades turn freely by hand, then test the motor for incoming power and continuity. If the motor has power but will not run, or lacks continuity, replace it. A faulty thermostat can also keep the microwave fan from turning on, while a clogged or damaged grille can restrict airflow and make the microwave vent not pulling air. If the motor is not receiving power, the control module may be defective, although it is less common. A failed micro switch can cause the same symptom as a failed door switch. Enter your Thermador microwave model number to find the exact replacement part. Any repair requiring outer-cabinet removal must be handled carefully because the high-voltage capacitor can store lethal charge even after unplugging. Proper capacitor discharge is required, so use a qualified technician if you are not familiar with the procedure.
01 - Thermador 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.
Enter model number to search for the required part specific to your product
Top Solution
02 - Thermador 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.
Top Solution
03 - Thermador 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.
Top Solution
04 - Thermador 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.
Highly Likely
05 - Thermador 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.
Common
06 - Thermador 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.
Common
Frequently Asked Questions
Why is my Thermador microwave exhaust fan not working?
How do I test a Thermador microwave door switch or micro switch?
How can I tell whether the Thermador exhaust fan motor has failed?
Is it safe to open a Thermador microwave to repair the exhaust fan?
How do I find the correct Thermador microwave exhaust fan part?
Shop by Thermador Microwave Parts
Shop by Popular Thermador Microwave Models
Our Story
Family-owned and operated since 1912, Burke America Parts Group is the longest-running genuine appliance, HVAC, and outdoor power equipment parts solution in North America. At Repair Clinic, we're proud to be an international brand trusted by the pros as well as the DIY community.
About Repair Clinic
© 2026 RepairClinic.com