LG
Intermittent Power Loss or Overcurrent
Microwave stops mid-cycle and resets or goes blank, then comes back on; may trip the household breaker.
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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
Loose power cord connection, Failing internal line fuse or thermal fuse, Shorting high-voltage component under load, Overloaded household circuit
How to Fix / Troubleshooting
Safety: Unplug the microwave. Repeated tripping can indicate a serious fault.
User checks:
- Dedicated circuit: Ensure the microwave is on a dedicated 15–20A circuit, not shared with refrigerators, dishwashers, or other heavy loads.
- Inspect cord and plug: Look for heat damage or discoloration at the plug. If present, discontinue use.
- Test at lower power: If safe, run a short cook cycle at 50% power. If it still shuts off, internal components may be overheating or shorting.
Internal fuses, thermostats, and high-voltage parts must be checked by a technician. Do not attempt to replace internal fuses yourself.
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Repair Difficulty
Professional Required
5/5
Required Part
Thermal Fuse / Thermostat
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