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KitchenAid Microwave not working

If your KitchenAid microwave is not working, start with the line fuse, the most likely cause when the microwave is not turning on or seems dead. A blown line fuse usually means too much current reached the circuitry, so test the fuse for continuity and investigate the underlying problem before replacing it. If your microwave has power but is not working, inspect the switch holder behind the control panel. A damaged or misaligned switch holder may prevent the door switches from actuating when the door closes. Next, consider the main control board, although it is rarely the cause and should only be replaced after other components test good. An overheated thermostat or thermal fuse can also cut power, while a failed outlet, tripped breaker, or household fuse may cause a microwave stopped working symptom. Enter your model number to find the exact KitchenAid replacement part for your microwave. Safety matters: opening the outer cabinet exposes a high-voltage capacitor that can store lethal charge even after the microwave is unplugged. The capacitor must be properly discharged before interior work, and repairs involving electrical components should be handled by a qualified technician if you are not familiar with safe discharge procedures.

01 - KitchenAid 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 - KitchenAid 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 - KitchenAid 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 - KitchenAid 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 - KitchenAid 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 - KitchenAid 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 KitchenAid microwave not working but has power?
How do I know if the KitchenAid microwave line fuse or thermal fuse is bad?
Could a KitchenAid microwave door switch holder cause the microwave to stop working?
Should I replace the KitchenAid microwave main control board first?
How do I find the correct KitchenAid microwave replacement part?