Microwave trips the circuit breaker or blows fuse when starting
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.
Possible Causes
How to Fix / Troubleshooting
Critical Safety Warning: Repeated breaker trips indicate a serious electrical fault. Do not continue to reset and retry.
User-level action:
- Unplug the microwave immediately.
- Do not use the unit until it has been inspected.
Technician-level steps:
- Inspect the line filter board and power cord for shorts or burn marks.
- Discharge and test the HV capacitor, diode, and magnetron for shorts.
- Check wiring harnesses for pinched or exposed wires.
Replace any shorted component with Summit-approved parts. Due to the risk of fire and shock, professional service is strongly recommended.
Repair Difficulty
Required Part
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