Grundig Short Circuit or Overcurrent on Startup

Microwave trips the household circuit breaker or blows the 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 high-voltage diode, Shorted magnetron, Shorted mains filter

How to Fix / Troubleshooting

Safety first: Do not repeatedly reset the breaker; this can cause further damage or fire.

User-level actions:

  • 1. Try another outlet: Plug the microwave into a different dedicated circuit to rule out wiring issues in the home.
  • 2. Remove from service: If the breaker still trips immediately on START, unplug the microwave and do not use it.

Internal shorts in high-voltage components or the mains filter require professional diagnosis and replacement. Do not attempt to bypass fuses or safety devices.

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Repair Difficulty

Professional Required 5/5

Required Part

High-Voltage Capacitor
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