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Thermador Microwave not working

If your Thermador microwave is not working, first check the incoming power by plugging another appliance into the outlet and checking the home circuit breaker or fuse. If the outlet has power, the line fuse is the most likely cause. Test the fuse for continuity with a multimeter, and investigate what caused it to blow before installing a replacement. A damaged or misaligned switch holder can also prevent the door switches from actuating when the door closes, so inspect the holder behind the control panel. Next, test the thermostat and thermal fuse for continuity. An overheated thermostat or blown thermal fuse can stop power from reaching the microwave, and neither part resets. A defective main control board is possible but uncommon, so rule out these more likely causes first. Any repair that requires opening the outer cabinet, including checking the microwave fuse location or replacing a fuse, involves serious risk. The high-voltage capacitor can store thousands of volts even after the microwave is unplugged and must be properly discharged before interior work. Use a qualified technician if you are not familiar with capacitor discharge procedures. Enter your model number to find the exact Thermador replacement part for your microwave.

01 - Thermador Microwave Line Fuse

If too much current passes through the microwave circuitry, the line fuse will blow. If the line fuse blows, the microwave won’t start. To determine if the line fuse is at fault, use a multimeter to test it for continuity. If the fuse does not have continuity, replace it. In addition, you should investigate and resolve the problem that caused the fuse to blow. If you don’t resolve the underlying issue, the new fuse will blow too. (Caution: The microwave oven can store thousands of volts of electricity in its high voltage capacitor, even after the microwave oven has been unplugged. Due to the potential for electric shock, i...t is extremely dangerous to replace the electronic components in a microwave. Only a licensed technician should replace the line fuse.)
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02 - Thermador Microwave Switch Holder

The microwave switch holder is the component that houses the door switches behind the control panel. If the switch holder is damaged or misaligned, one of more switches may not be actuated when the microwave door is closed, resulting in the microwave not working. You will need to uninstall the control panel and inspect the switch holder to confirm it is in good condition and secured properly. Replace the switch holder with a new one if necessary.
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03 - Thermador Microwave Main Control Board

The main control board might be defective. However, this is rarely the case. Control boards are often misdiagnosed—check all of the more commonly defective parts. If you have determined that all of the other components are working properly,replace the main control board. (Caution: The microwave oven can store thousands of volts of electricity in its high voltage capacitor, even after the microwave oven has been unplugged. Due to the potential for electric shock, it is extremely dangerous to replace the electronic components in a microwave. Only a licensed technician should replace the main control board.)
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04 - Thermador Microwave Thermostat

If the microwave overheats, the thermostat trips to cut off voltage to the microwave. If the thermostat is shorted open, it may not allow voltage to reach the high voltage components. To determine if the thermostat is at fault, use a multimeter to test it for electrical continuity. If the thermostat does not have continuity, and it cannot be reset, replace it.
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Highly Likely

05 - Incoming Power Problem

The electrical outlet may not be getting power. To determine if the outlet is getting power, try plugging something else into the outlet. If the outlet is not getting power, check the home circuit breakers or fuses.
Highly Likely

06 - Thermador Microwave Thermal Fuse

The thermal fuse cuts off power to the microwave if the microwave overheats. To determine if the thermal fuse has blown, use a multimeter to test it for continuity. If the fuse does not have continuity, replace it. The thermal fuse cannot be reset—if the fuse is blown, it must be replaced. (Caution: The microwave oven can store thousands of volts of electricity in its high voltage capacitor, even after the microwave oven has been unplugged. Due to the potential for electric shock, it is extremely dangerous to replace the electronic components in a microwave. Only a licensed technician should replace the thermal fuse.)
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Common

Frequently Asked Questions

Why is my Thermador microwave not working but has power?
How do I test a Thermador microwave thermal fuse or thermostat?
Could a Thermador microwave door switch or switch holder cause it to stop working?
Is the Thermador microwave main control board the problem if the microwave stopped working?
How do I find the correct Thermador microwave replacement part?

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