OK
Short Circuit or Inrush Overload
Microwave trips the household circuit breaker or blows fuse when 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, Shorted high-voltage diode, Shorted magnetron, Shorted line filter or power cord
How to Fix / Troubleshooting
Safety: Do not repeatedly reset the breaker. Unplug the microwave and leave it unplugged until inspected.
- 1. Test outlet with another appliance: Confirm the circuit is otherwise healthy.
- 2. Internal inspection: With the cover removed (unplugged), look for burnt components near the power input and high-voltage section.
- 3. Do not attempt high-voltage testing unless qualified. These components can be lethal.
- 4. Likely repair: Replacement of the shorted component (often capacitor or diode) and inspection of the magnetron and transformer by a technician.
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Repair Difficulty
Professional Required
5/5
Required Part
High Voltage Capacitor
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