Swan Short Circuit or Overcurrent on Startup

Microwave trips the household circuit breaker or blows fuses when starting.

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.

Possible Causes

Shorted high-voltage capacitor or diode, Shorted magnetron, Faulty mains filter board, Overloaded electrical circuit

Safety: Repeated tripping indicates a serious fault. Do not keep resetting the breaker.

Step 1 – Check circuit load: Ensure the microwave is on a dedicated circuit or not sharing with other high-power appliances.
Step 2 – Inspect power cord and plug: Look for damage, burns, or loose connections. Replace if faulty.
Step 3 – Internal diagnosis: Shorted HV components or mains filter require testing with the unit unplugged and the capacitor safely discharged. This should be done by a qualified technician.

Professional Required 5/5

High-Voltage Diode

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