JennAir
Short Circuit or Overcurrent on Startup
Microwave trips the household circuit breaker or blows a fuse when starting a cook cycle.
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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 magnetron, Shorted power cord, Faulty line filter board
How to Fix / Troubleshooting
Safety First: Unplug the microwave immediately. Do not repeatedly reset the breaker and retry, as this can cause further damage or fire.
- Visual inspection: Look for burn marks or melted plastic around the power cord entry and vents.
- Check outlet and circuit: Ensure the microwave is on a dedicated circuit of appropriate amperage. Do not use extension cords.
- Internal diagnosis: A technician should test the HV capacitor, magnetron, and line filter board for shorts using a multimeter.
- Replace failed parts: Replace any shorted components and the line fuse if blown. Verify safe operation before returning the unit to service.
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Repair Difficulty
Professional Required
5/5
Required Part
High-Voltage Capacitor
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