C6
Thermomix
Internal Electronics Self-Test Failure
C6 error is displayed and the Thermomix will not start the motor or heating.
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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
Corrupted firmware or failed self-test at startup, Faulty main control board microcontroller, Power supply instability on logic rails, Internal memory or watchdog failure
How to Fix / Troubleshooting
Safety first: Disconnect the unit from mains for at least 5 minutes to allow capacitors to discharge.
- Hard reset: Unplug the Thermomix, wait 5–10 minutes, then plug it back in and power on. Sometimes a transient error clears after a full power cycle.
- Stable power source: Connect the appliance directly to a wall outlet (no extension cords or power strips) to ensure stable voltage.
- Check for moisture: Inspect around the base and control panel for signs of liquid ingress. If the unit has been exposed to spills, allow it to dry for 24 hours in a warm, dry environment before retrying.
- Service requirement: Persistent C6 indicates a serious internal electronics fault. The main control board will likely need replacement and firmware programming by an authorized service center.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control Board
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