Washer-dryer combo displays F28 and may not respond to cycle selections or may freeze mid-cycle.

Safety first: Unplug the appliance before accessing the console or control boards.

Step-by-step checks:

• 1. Remove console: Take off the top panel and then the console screws to access the UI board and wiring.
• 2. Reseat all UI connectors: Unplug and reconnect the ribbon cables and harnesses between the UI and main control board several times.
• 3. Inspect harness: Look for any signs of pinched or broken wires, especially where the harness passes through metal openings.
• 4. Check for corrosion: If there is evidence of moisture intrusion, dry the area and consider replacing the affected board.
• 5. Replace suspect board: If F28 persists after harness checks, replace the UI board or main control board as indicated by service literature for your model.