F28
Whirlpool
Serial Communication Error (CCU to UI)
Washer shows F28, may not start or may freeze during cycle, often on models with user interface and main control communication.
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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 harness between user interface and main control, failed user interface board, failed main control board
How to Fix / Troubleshooting
Safety first: Unplug the washer before removing the console or top panel.
Step-by-step:
- Access console: Remove screws securing the console and gently tilt it forward to access the user interface board and wiring.
- Inspect harness: Check the ribbon cable or harness between the UI and CCU for damage, kinks, or corrosion. Reseat both ends.
- Check for moisture: Look for signs of water intrusion into the console area. Dry thoroughly if present.
- Visual inspection: Examine both UI and CCU for burnt components or physical damage.
- Test operation: Reassemble and power on. If F28 persists, one of the boards may need replacement.
When to call a technician: Determining whether the UI or CCU is faulty often requires specialized tests. Professional diagnosis is recommended.
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Repair Difficulty
Professional Required
5/5
Required Part
User Interface Control Board
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