E12
Summit
Power Supply / Noise Filter Board Fault
Microwave shows E12 and the clock resets intermittently or unit powers off randomly
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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
Loose power cord connection inside unit, Failed noise filter board, Intermittent line fuse connection, Faulty control board power supply section
How to Fix / Troubleshooting
Safety: Unplug the microwave before opening the cabinet.
Basic checks:
- Ensure the plug fits snugly in the outlet and that the outlet is not loose.
- Avoid using extension cords; plug directly into a wall outlet.
Internal inspection:
- Remove the cabinet and inspect the noise filter / power input board where the power cord enters.
- Check for loose spade connectors, burned components, or cracked solder joints.
- Reseat connectors and, if necessary, replace the noise filter board.
- If the filter board is good, the control board's power supply may be failing and require replacement.
After repair, monitor the unit for several days to ensure the clock and power remain stable.
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Repair Difficulty
Hard
4/5
Required Part
Noise Filter Board
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