Clatronic
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 high-voltage diode, Shorted magnetron, Shorted mains filter or power cord
How to Fix / Troubleshooting
Safety first: Unplug the microwave immediately after any trip or blown fuse.
User-level actions:
- Try a different outlet: Use a dedicated outlet (no extension cords) on a properly rated circuit to rule out wiring issues.
- Do not repeatedly reset: Repeatedly resetting the breaker can cause further damage or fire risk.
Technician-level diagnosis:
- Inspect the mains filter board and power cord for shorts or burn marks.
- Test the HV capacitor, HV diode, and magnetron for shorts with appropriate tools (capacitor discharged).
Recommendation: Because this involves high-voltage components, have a qualified technician perform the repair.
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Repair Difficulty
Professional Required
5/5
Required Part
High-Voltage Diode
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