F12
Bauknecht
Communication Error Between Control Boards
Dryer shows F12 and may not start; sometimes appears after power interruptions.
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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 harness between main control and secondary module (e.g., power module), Defective secondary control module, Electrical noise or surge, Corroded connectors
How to Fix / Troubleshooting
Safety first: Unplug the dryer before accessing internal electronics.
- Power reset: Disconnect power for 10 minutes, then reconnect and test.
- Locate control modules:
- Remove the top cover.
- Identify the main control board and any secondary power or motor control modules.
- Check harnesses: Reseat all multi-pin connectors between boards, ensuring they latch securely.
- Inspect for damage: Look for burnt pins, discoloration, or melted plastic at connectors.
- If F12 persists: One of the boards may be defective. Replacement and configuration are typically technician-level tasks.
Warning: Do not attempt to modify wiring between boards; incorrect connections can cause further damage.
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Repair Difficulty
Professional Required
5/5
Required Part
Power Module / Main Control Board
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