Haier
Short circuit or high inrush current in microwave
Microwave trips the household 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, Faulty line filter or power cord
How to Fix / Troubleshooting
Critical safety warning: Do not repeatedly reset breakers or replace fuses if they trip when starting the microwave. High-voltage components may be shorted and dangerous.
- Stop using immediately: Unplug the microwave and do not attempt further operation.
- Check outlet and circuit: Confirm the microwave is on a dedicated circuit and that the breaker is correctly rated.
- Professional service only: Diagnosis of internal shorts requires testing the high-voltage capacitor, diode, magnetron, and line filter. This must be done by a qualified technician due to shock risk.
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Repair Difficulty
Professional Required
5/5
Required Part
High-Voltage Capacitor / Diode / Magnetron
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