C9
Thermomix
Internal Scale Sensor Fault
C9 error appears when trying to start a program that uses the scale or when placing items on the lid.
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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
Defective load cell under base, Damaged or pinched scale wiring harness, Loose scale connector on PCB, Calibration data corruption on main board
How to Fix / Troubleshooting
Safety first: Ensure the Thermomix is on a stable, level surface and unplug it before moving.
- Check placement: Place the unit on a hard, flat, vibration-free surface. Avoid soft mats or uneven countertops that can twist the base.
- Remove external pressure: Make sure nothing is touching or leaning on the machine (cables, walls, other appliances) that could affect the scale.
- Recalibrate (if supported): Some models allow a scale reset via the settings menu. Follow the official procedure to reset or calibrate the scale.
- Inspect base (advanced): With the unit unplugged, remove the bottom cover and check that the load cell and its mounting screws are secure and that the wiring is intact.
- Service requirement: If C9 persists, the load cell or main PCB scale circuit is likely defective and must be replaced by a technician.
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Repair Difficulty
Medium
3/5
Required Part
Internal Load Cell (Scale Sensor)
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