Commercial Chef
No Power – Primary Power Circuit Failure
Microwave will not start at all; display is blank and no lights or sounds when pressing buttons.
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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 or magnetron, faulty power cord, failed main control board power supply
How to Fix / Troubleshooting
Safety: Unplug the microwave before any inspection. Do not bypass fuses.
Basic checks:
- Verify that the wall outlet has power by plugging in another appliance.
- Check the household circuit breaker or fuse for the microwave circuit.
- Inspect the microwave power cord for visible damage; do not use if damaged.
Internal fuse check (advanced):
- Remove the outer cabinet and locate the line fuse near the power cord entry.
- Test the fuse with a multimeter for continuity. Replace only with the exact same type and rating if blown.
- If the new fuse blows immediately, there is likely a short in the high-voltage or control circuit that requires professional diagnosis.
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Repair Difficulty
Hard
4/5
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