Proline Short Circuit or Overcurrent on Start

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

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, Shorted magnetron, Faulty line filter board, Damaged power cord

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

User-level checks:

Try a different outlet on a dedicated circuit, if available, to rule out a weak breaker (do not use an extension cord).
If the breaker trips immediately when pressing START, unplug the microwave and stop using it.

Next steps:

A technician must test the HV capacitor, magnetron, and line filter for shorts and replace faulty parts.

Professional Required 5/5

High-Voltage Capacitor

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