E90 AEG washing machine error E90 — board communication

What it means

If your AEG washing machine shows E90: communication between the main control board and the display/keypad board has failed.

Likely causes

Corroded connectors, broken wire, moisture on the board, failed board component.

Safe steps you can try

Unplug the appliance completely for 15 minutes and plug it back in.

When to call a technician

If it persists, the boards and the cable between them should be checked by a technician; board repair is often cheaper than replacement.