F12
Bauknecht
Communication Error Between User Interface and Main Control Board
Dishwasher shows F12, may not start or may stop unexpectedly; often related to communication between control modules.
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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 connector between display PCB and main PCB, Damaged wiring harness in door, Faulty user interface board, Faulty main control board
How to Fix / Troubleshooting
Safety first: Disconnect power before opening the door panel.
- Inspect door harness: Remove the inner door panel to access the wiring between the user interface (control panel) and the main control board. Look for pinched, broken, or corroded wires.
- Check connectors: Reseat all multi-pin connectors on both the user interface PCB and the main control module. Ensure they are fully latched.
- Look for moisture: Check for signs of water ingress into the control panel area, which can cause corrosion or short circuits. Dry thoroughly if moisture is present.
- Board testing: If wiring is intact and F12 persists, either the user interface board or the main control board may be defective. Replacement is typically required; consider professional diagnosis.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Board
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