C7 error appears when trying to start the motor or during speed changes.

Safety first: Unplug the Thermomix before any disassembly. Moving parts and mains voltage are present inside.

• Check for overload: Remove the bowl contents and check if the blades or shaft are jammed by hard food pieces or foreign objects. Free any obstruction and try again.
• Test at low speed: With an empty bowl, try running at a low speed. If C7 appears immediately, the issue is likely electronic rather than mechanical load.
• Advanced inspection: Remove the bottom cover and locate the motor assembly. Inspect the tachometer sensor and wiring for damage or disconnection. Ensure the sensor is correctly positioned relative to the motor magnet/encoder.
• Professional calibration: If the tachometer sensor tests good but the error persists, the main PCB speed feedback circuit may be defective. Replacement and calibration should be done by a qualified technician.