F12

Bauknecht User interface to main control communication fault

Washer does not start, F12 displayed, sometimes no response from buttons

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.

Possible Causes

Loose ribbon cable between display board and main board, oxidized UI connectors, failed user interface PCB, failed main control PCB

How to Fix / Troubleshooting

Safety first: Disconnect power.

Access control panel: Remove the top cover, then unscrew and carefully pull out the front control panel.
Check ribbon cable: Locate the flat ribbon cable between the user interface (display/keys) and the main control board. Reseat both ends and ensure there are no kinks or cracks.
Inspect for corrosion: Look for signs of detergent or moisture damage on the UI board. Clean light residue with isopropyl alcohol and a soft brush.

If F12 persists: Either the user interface board or the main control board is defective. Replacement of one or both boards may be required.

Repair Difficulty

Medium 3/5

Required Part

User Interface Board

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