Problem: Communication error between main control board (CCU) and user interface board
How to Fix Washer Error
- Unplug washer for 2 minutes to reset communication bus.
- Remove top panel to access main control board (CCU) connections.
- Locate ribbon cable or multi-wire harness connecting CCU to user interface/display board.
- Disconnect and reconnect both ends of harness, inspecting for bent pins or corrosion.
- Check harness routing for pinch points between cabinet panels.
- Verify display board receives 5V DC from CCU (test at connector pins).
- Inspect display board for moisture damage or burnt components near communication IC.
- If harness tests good (continuity on all pins) but error persists, replace user interface board first (less expensive).
- If F28 returns after interface replacement, replace main control board W
- After repair, verify all display functions and button responses operate correctly through diagnostic mode.
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Still Not Working?
If the replacement part didn’t fix the issue, you may have a wiring problem or main board failure.
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