Washer-dryer combo displays E91 and may not communicate between UI and main control; display may be blank or show partial info.

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 harness, Failed UI board, Failed main control board, Electrical noise or surge damage

Safety first: Unplug the appliance before accessing control components.

Inspect harness: Locate and inspect the communication cable between the UI and main control. Reseat connectors and check for damage.
Power reset: Leave unplugged for several minutes, then restore power and test.
Substitute boards: If available, substitute a known-good user interface board or main control board to isolate the faulty component.
Replace defective board: Once identified, replace the faulty board and re-test.

Professional Required 5/5

User Interface Board

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