Monogram
Short Circuit or Overcurrent on Startup
Microwave trips the 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 high-voltage diode, shorted magnetron, shorted line filter board, shorted power cord
How to Fix / Troubleshooting
Safety: Do not repeatedly reset the breaker; this can cause wiring damage or fire. Unplug the microwave.
- Isolate the issue: Confirm that other appliances on the same circuit do not cause tripping. If only the microwave trips the breaker, the fault is internal.
- Visual inspection: A technician can remove the outer cover and inspect for burnt components on the line filter board, high-voltage capacitor, diode, and magnetron.
- Component testing: Using a multimeter, the technician will test for shorts to ground and replace any failed components.
Recommendation: Because this involves high-voltage and potential fire hazards, contact an authorized Monogram service provider.
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Repair Difficulty
Professional Required
5/5
Required Part
High-Voltage Capacitor
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