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Bosch Microwave not working

When a Bosch microwave is not working, start with the line fuse, the most common cause when the microwave is not turning on or appears dead. A blown line fuse interrupts power, but the underlying electrical problem must also be corrected or the replacement fuse may blow again. Next, inspect the switch holder behind the control panel. If it is damaged or misaligned, the door switches may not engage when the door closes, leaving the Bosch microwave not working even when it has power. A defective main control board is possible but uncommon, so test the more likely parts first. An overheated or open thermostat can stop voltage from reaching the high-voltage components, while a failed thermal fuse can also cut power after overheating. Finally, verify that the electrical outlet works and check the home circuit breaker or fuse. Enter your model number to find the exact Bosch replacement part for your microwave. Any repair requiring removal of the outer cabinet, including fuse, thermostat, thermal fuse, switch holder, or control board work, exposes you to a high-voltage capacitor that can store a lethal charge after unplugging. Proper capacitor discharge is required, and a qualified technician should handle the repair if you are unfamiliar with that procedure.

01 - Bosch 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 - Bosch 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 - Bosch 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 - Bosch 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 - Bosch 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

07 - Bosch Microwave Control Board

Since the control board controls the voltage being sent to all of the microwave's components, a defective board could be responsible for a microwave not working. 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 control board.
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Common

Frequently Asked Questions

Why is my Bosch microwave not working but has power?
How do I know if the Bosch microwave fuse is blown, and where is the fuse located?
Why won't my Bosch microwave start when the door is closed?
Could a Bosch microwave main control board be causing it not to work?
How do I find the correct Bosch microwave replacement part?