Amana
Overcurrent / Short Circuit in Microwave
Microwave trips the household circuit breaker or blows a fuse when starting or shortly after 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 or diode, Shorted magnetron, Shorted line filter, Pinched or shorted wiring harness
How to Fix / Troubleshooting
Safety First: Do not repeatedly reset the breaker. Unplug the microwave and leave it unplugged until the fault is found. High-voltage components can be lethal.
- Check outlet and circuit: Ensure the microwave is on a dedicated circuit of appropriate amperage. Do not use extension cords.
- Observe when it trips: If the breaker trips immediately when pressing Start, a high-voltage short is likely. If it trips when opening/closing the door, a door switch or wiring short is suspect.
- Internal inspection (for professionals): Remove the cover and inspect the high-voltage capacitor, diode, magnetron, and wiring for burn marks or melted insulation.
- Component testing: A technician should test the suspect components and replace any that are shorted.
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Repair Difficulty
Professional Required
5/5
Required Part
High-Voltage Capacitor or Magnetron
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