Westinghouse
No Power – Primary Power Circuit Failure
Microwave does not power on at all; display is blank and unit appears dead.
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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
Blown internal line fuse,Open thermal fuse on cavity,Defective line filter board,Faulty power cord or plug
How to Fix / Troubleshooting
Safety first: Unplug the microwave before any inspection. Do not bypass fuses or safety devices.
User-level checks:
- 1. Verify outlet: Plug another appliance into the same outlet to confirm power. Reset any tripped breakers or GFCI outlets.
- 2. Inspect power cord: Look for visible damage, burns, or cuts. If damaged, do not use the microwave.
Advanced steps:
- 3. Check internal fuse: Remove the outer cover and locate the main line fuse near the power cord entry. Test with a multimeter and replace only with the exact same rating if blown.
- 4. Test thermal fuses: Check cavity and magnetron thermal fuses for continuity. Replace any open devices.
- 5. Inspect line filter board: Look for burnt components or loose connections.
If the new fuse blows immediately, there is likely a short in the HV or control circuit; stop and call a technician.
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Repair Difficulty
Hard
4/5
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