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Short Circuit or Overcurrent on Startup
Microwave trips the household circuit breaker or blows the fuse when starting a cooking cycle.
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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
Shorted high-voltage capacitor,Shorted magnetron,Shorted mains filter or line suppressor,Water ingress causing tracking
How to Fix / Troubleshooting
Safety warning: Repeatedly resetting breakers without fixing the cause is dangerous. Unplug the microwave and do not use until inspected.
User-level checks:
- 1. Try a different outlet: Use a dedicated outlet with correct rating. Do not use extension cords.
- 2. Check for moisture: If the unit was exposed to water or heavy steam, allow it to dry for 24 hours.
Technician-level checks:
- Inspect the mains filter, power cord, and internal wiring for shorts or burn marks.
- Test the high-voltage capacitor and magnetron for shorts.
- Replace any shorted components and verify insulation.
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Repair Difficulty
Professional Required
5/5
Required Part
High-Voltage Capacitor
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