Washer displays E91; communication error between main control board and user interface.

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 or damaged communication cable, Faulty user interface board, Defective main PCB, Electrical noise or surge damage

Safety first: Unplug the washer before removing the control panel.

1. Power cycle: Disconnect power for 10 minutes, then reconnect and test.
2. Reseat communication cables: Remove the top cover and control panel. Disconnect and reconnect the ribbon or harness between the UI and main PCB.
3. Inspect for damage: Look for burnt tracks or components on both boards. Replace any obviously damaged board.
4. Replace faulty board: If reseating cables does not help, replace the user interface first, then the main PCB if needed.

Hard 4/5

User Interface Board

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