Washer displays E90; general communication error; may not start or respond correctly.

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 harness between UI board and main control, Faulty user interface PCB, Faulty main control board, Electrical noise or surge damage

Safety: Unplug the washer for at least 5 minutes to allow a full reset.

Power reset: After waiting, plug back in and try a simple cycle. If E90 returns, proceed with inspection.
Check connections: Remove the top panel and control console. Inspect and reseat the ribbon cable or harness between the display/control panel and the main board.
Look for damage: Examine both boards for burn marks, corrosion, or moisture.

Board-level diagnosis and replacement are typically professional tasks.

Professional Required 5/5

User Interface Control Board

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