E42
Electrolux
Internal Control Board Memory/EEPROM Error
Microwave intermittently freezes or reboots; E42 appears on the display.
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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 firmware, Failed EEPROM on main PCB, Voltage spikes affecting control board, Defective main control board
How to Fix / Troubleshooting
Safety: Unplug the unit before any disassembly.
User-level steps:
- Hard reset: Unplug the microwave for at least 15 minutes to fully discharge and reset the control board.
- Surge protection: If the unit is connected to a circuit with frequent surges, consider using a quality surge protector (if allowed by Electrolux guidelines) or having an electrician inspect the supply.
Technician-level steps:
- Check for updated firmware or service bulletins from Electrolux for the specific model.
- If reprogramming is supported, reload firmware using the manufacturer’s procedure.
- If firmware reload is not possible or fails, replace the main control board.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Board
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