MasterChef Short Circuit or Excessive Current Draw

Microwave trips the household circuit breaker or blows a fuse when starting.

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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 power cord or noise filter, Faulty line filter capacitor

How to Fix / Troubleshooting

Safety first: Repeated breaker tripping indicates a serious electrical fault. Unplug the microwave and do not repeatedly reset the breaker.

Steps:

  • 1. Try a different outlet: Plug the microwave into another properly rated circuit to rule out a weak breaker (only if safe to do so).
  • 2. Observe when it trips: If the breaker trips immediately upon pressing START, a short in the HV or primary circuit is likely.

Recommendation: Internal diagnosis (testing the HV capacitor, magnetron, and noise filter) involves high voltage and should be done by a qualified technician. Do not attempt to open or repair the HV section yourself.

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Repair Difficulty

Professional Required 5/5

Required Part

High-Voltage Capacitor
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