E20
Summit
Control Board Initialization Failure
Microwave shows E20 and the unit will not respond after a power outage
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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
Corrupted control firmware, Power surge damage, Failed EEPROM on control board, Loose control board connectors
How to Fix / Troubleshooting
Safety: Unplug the microwave before removing the control panel.
Reset attempt:
- Unplug the unit for at least 10–15 minutes.
- Plug back in and attempt to set the clock and start a simple cook cycle.
If E20 persists:
- Remove the control panel and inspect the main control board for burned components or damaged traces.
- Reseat all wiring harness connectors.
- If no visible issues are found and the error remains, replace the main control board.
Consider using a surge protector in the future to protect the electronics from power disturbances.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Board
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