Westinghouse
Thermal Protection Trip / Intermittent Power Loss
Microwave light and fan work, but unit stops after a few seconds of cooking with no error code.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Overheating magnetron or cavity,Weak thermal cutout that opens prematurely,Loose connection on control board,Failing door switch that opens under vibration
How to Fix / Troubleshooting
Safety first: Unplug the microwave before internal inspection.
User-level steps:
- 1. Ensure ventilation: Confirm that vents are clear and the unit has proper clearance.
- 2. Test with light load: Try heating a cup of water. Note if it stops at a consistent time.
Advanced steps:
- 3. Inspect thermal cutouts: Test cavity and magnetron thermal cutouts for intermittent operation (may require heating tests with a technician).
- 4. Check door switches: Ensure switches remain engaged when the unit vibrates.
- 5. Inspect control board: Look for loose connectors or cold solder joints.
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Repair Difficulty
Hard
4/5
Required Part
Cavity Thermal Fuse
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