Tower Short Circuit or Earth Leakage in High Voltage or Mains Circuit

Microwave trips the household circuit breaker or RCD as soon as it starts or shortly after.

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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 transformer, damaged mains filter (EMI filter), moisture inside cavity or wiring

How to Fix / Troubleshooting

Safety: Repeated tripping indicates a potentially dangerous fault. Avoid repeated reset attempts.

User-level checks:

  • 1. Different outlet: Try a different properly rated outlet to rule out a faulty socket (do not use extension leads).
  • 2. Drying: If the microwave was recently cleaned with water or has condensation, leave the door open and allow it to dry for 24 hours, then test again.

Technician-level checks:

  • Inspect the mains filter (EMI filter) for burning or cracking.
  • Test the high-voltage capacitor and transformer for shorts to ground.
  • Check wiring for insulation damage where it passes through metal panels.

Note: Because of shock and fire risk, this fault should be handled by a professional.

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Repair Difficulty

Professional Required 5/5

Required Part

EMI Filter Assembly
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