C18
Thermomix
User Interface / Touch Panel Fault
C18 error is displayed and the touchscreen or control knob becomes unresponsive or erratic.
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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 touchscreen digitizer, Loose ribbon cable between display and main PCB, Liquid ingress behind the display, Firmware glitch affecting UI controller
How to Fix / Troubleshooting
Safety first: Unplug the appliance before inspecting the display area.
- Clean the screen: Wipe the touchscreen with a soft, slightly damp cloth to remove grease or residue. Dry thoroughly.
- Restart the unit: Power off, wait a few minutes, and power on again to clear temporary UI glitches.
- Check for moisture: Inspect around the display for signs of condensation or spills. If moisture is suspected, allow the unit to dry for 24 hours before retrying.
- Advanced cable check: With the housing opened (only if competent), reseat the ribbon cable connecting the display/touch panel to the main PCB.
- Service requirement: Persistent C18 usually requires replacement of the display/touch module or main PCB by a technician.
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Repair Difficulty
Hard
4/5
Required Part
Touchscreen / Display Module
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