E12
Bush
Low-Voltage Power Supply / Auxiliary Load Fault
Microwave shows E12; interior light, fan, or turntable may not operate correctly.
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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
Failed low-voltage transformer or SMPS on control PCB, Blown internal fuse feeding low-voltage circuits, Loose harness to fan or lamp, Faulty relay on control PCB
How to Fix / Troubleshooting
Safety: Unplug the microwave. Internal fuses and power supplies are connected to mains voltage.
- Check internal fuses: Remove the outer cover and locate the low-voltage or secondary fuses on the PCB or wiring harness. Test with a multimeter and replace only with the same type and rating if blown.
- Inspect wiring: Check connectors to the fan motor, cavity lamp, and turntable motor. Reseat any loose plugs.
- Control board inspection: Look for burnt components or bulging capacitors on the low-voltage section of the PCB. If present, the board should be replaced.
- Professional repair: If E12 persists and fuses blow repeatedly, a shorted component or faulty PCB is likely. This should be diagnosed by a technician.
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Repair Difficulty
Hard
4/5
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