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Short Circuit or Overcurrent on Start
Microwave trips the household circuit breaker or blows the fuse when starting a cook 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 high-voltage diode, Shorted magnetron, Faulty mains filter or power cord
How to Fix / Troubleshooting
Safety: Do not repeatedly reset breakers or replace fuses; this can cause fire. Unplug the microwave.
Steps:
- 1. Try a different outlet: Plug into a dedicated outlet on a different circuit (if safe and allowed) to rule out a weak breaker. If it still trips, the microwave is at fault.
- 2. Visual inspection: Check the power cord for damage. If damaged, have it replaced professionally.
- 3. Internal HV components: Diagnosis of HV shorts requires specialized knowledge and tools. A technician will test the capacitor, diode, and magnetron.
Due to the risk of electric shock and fire, this fault should be handled by a qualified technician.
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Repair Difficulty
Professional Required
5/5
Required Part
High-Voltage Capacitor
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