C15 error appears when trying to start a heating program; motor may still run without heat.

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.

Possible Causes

Partial short in heating element, Damaged heater insulation contacting chassis, Faulty heater triac causing uncontrolled current, Wiring insulation damage near heater block

How to Fix / Troubleshooting

Safety first: Unplug the Thermomix immediately. Do not continue to use the heating function until inspected.

Visual and smell check: Remove the bowl and inspect the heater area for burn marks or a strong burnt smell.
Do not test repeatedly: Avoid repeatedly attempting to start heating, as this can worsen damage and increase fire risk.
Professional diagnosis: Testing heater current and insulation resistance requires proper instruments and safety precautions. Arrange service with an authorized technician to test and replace the heater block or PCB as needed.

Repair Difficulty

Professional Required 5/5

Required Part

Heater Block Assembly

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