How to Fix / Troubleshooting

Safety first: Unplug the microwave immediately after any trip. Do not repeatedly reset the breaker and retry.

Check other appliances: Confirm that the circuit is not overloaded by multiple high-power devices. Move the microwave to a dedicated circuit if possible.
Visual inspection: Examine the power cord and plug for burns or damage. If found, discontinue use.
Do not open the cabinet: The likely cause is an internal short in the high-voltage section, which is dangerous to service without training.
Professional repair: A technician should test the HV capacitor, diode, magnetron, and mains filter for shorts and replace the defective part.

Warning: Repeated breaker tripping can overheat wiring; address the fault before further use.

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

Possible Causes