F21
Bauknecht
Motor tachometer / motor control fault
Washer-dryer drum does not spin or only jerks, F21 displayed.
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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
Faulty motor tachometer sensor, worn carbon brushes on universal motor, damaged motor wiring harness, failed motor driver on control board
How to Fix / Troubleshooting
Safety first: Unplug the appliance.
Inspect motor and brushes:
- Access motor: Remove the rear panel. The motor is mounted under the drum with a drive belt.
- Check belt: Ensure the belt is intact and properly tensioned.
- Carbon brushes: Remove the motor (if necessary) and inspect the carbon brushes. If they are shorter than ~1 cm or unevenly worn, replace both brushes with Bauknecht-compatible parts.
- Tachometer: On the motor shaft end, inspect the tachometer coil and connector. Ensure it is firmly attached and not physically damaged.
Test: Reassemble and run a spin cycle. If F21 persists, the motor or control board motor driver may be defective and require replacement.
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Repair Difficulty
Medium
3/5
Required Part
Drive Motor Carbon Brushes
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