E18 displayed; machine reports communication error between control board and user interface.

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.

Possible Causes

Loose ribbon cable between main PCB and display board, Damaged user interface PCB, Oxidized connectors, Firmware incompatibility after board replacement

How to Fix / Troubleshooting

Safety: Disconnect from mains before opening the housing.

Power cycle: Unplug for 10 minutes, then reconnect to clear transient communication errors.
Check cables: Open the top/front panel and inspect the flat ribbon cable between the display board and main PCB. Reseat both ends carefully.
Clean connectors: Use contact cleaner on the connectors if signs of oxidation are present.
Board replacement: If the error persists, the user interface PCB or main PCB may be defective and require replacement with the correct AEG part number.

Repair Difficulty

Hard 4/5

Required Part

User Interface PCB / Ribbon Cable

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