Viking
Short Circuit or Overcurrent on Startup
Microwave trips the home 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 or diode, Shorted magnetron, Pinched or shorted wiring harness, Faulty line filter
How to Fix / Troubleshooting
Safety: Repeated breaker tripping indicates a potentially dangerous short. Unplug the Viking microwave and do not continue resetting the breaker.
- Visual inspection: With the cabinet removed and power off, inspect wiring for pinched, melted, or bare wires touching the chassis.
- Check line filter: Inspect the line filter assembly near the power cord entry for burn marks or cracks.
- Professional HV testing: Have a qualified technician test the high-voltage capacitor, diode, and magnetron for shorts.
- Replace failed components: Replace any shorted Viking components (capacitor, diode, magnetron, wiring harness) and ensure proper routing and securing of wires.
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Repair Difficulty
Professional Required
5/5
Required Part
High-Voltage Capacitor
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