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My Microwave Shuts Off After a Few Seconds

Common solutions for: My Microwave Shuts Off After a Few Seconds

01 - Door Switch
A door switch might be failing intermittently. Check each of the door switches for signs of overheating, arcing, or burning. If you don’t see any obvious signs of failure, use a multimeter to test each switch for continuity. If any of the switches is visibly damaged or only has intermittent continuity, replace it.
Required Part
Microwave Door Switch
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Most Common Solution
02 - Main Control Board
Control boards are often misdiagnosed—before replacing the control board, first check more commonly defective parts, particularly the door switches. If all of the other components are working properly, replace the control board.
Required Part
Microwave Main Control Board
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Most Common Solution
03 - Touchpad
If the microwave runs for a few seconds and stops the touchpad might be at fault. This is not common. Generally speaking, if the microwave display is working and some of the buttons respond correctly but some don’t, the problem is with the touchpad.
Required Part
Microwave Touchpad
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Most Common Solution
04 - Touchpad and Control Panel
To determine if the touchpad and control panel are defective, try pressing each of the buttons on the control panel. If some of the buttons respond correctly while others don’t, replace the touchpad and control panel.
Required Part
Microwave Touchpad and Control Panel
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Most Common Solution
05 - High Voltage Transformer
Microwave ovens produce a very high voltage in order to power the magnetron antenna, which emits the energy that cooks the food. When a high voltage transformer fails, it will usually arc and have a burning smell. (Warning: The microwave oven can store a lethal amount of electricity in its high voltage capacitor, even after the microwave oven has been unplugged. Due to the high running voltage and the potential for electric shock, it is extremely dangerous to replace the electronic components in... a microwave. Only a licensed technician should replace the high voltage transformer.)
Required Part
Microwave High Voltage Transformer
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Common Solution
06 - Thermoprotector
If the microwave runs for a few seconds and stops the thermoprotector may have tripped. This is a safety device to prevent the microwave from overheating. It can be tested for continuity to see if it's blown.
Required Part
Microwave Thermoprotector
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Common Solution

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