F28
Whirlpool Serial Communication Error (UI to CCU)

Washer-dryer combo displays F28 and may not start or may stop unexpectedly.

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Safety Warning

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.

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Possible Causes

Loose or damaged communication harness, oxidized connectors, failed user interface board, failed main control board

How to Fix / Troubleshooting

Safety first: Unplug the unit before removing the console or top panel.

Step-by-step checks:

  • Reseat communication cables: Locate the harness between the UI and CCU. Disconnect and reconnect each end several times.
  • Inspect for damage: Look for pinched or cut wires, especially where the harness passes through metal openings.
  • Check for moisture: Ensure the console area is dry and free of detergent residue.

When to replace: If wiring is intact and F28 persists, replace the user interface board first. If the error remains, replace the main control board.

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Repair Difficulty

Hard 4/5

Required Part

User Interface Control Board
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