C145 error during operation, often accompanied by unusual grinding or rattling noises

Safety first: Unplug the appliance immediately if you hear grinding or smell burning plastic.

• 1. Visual inspection: Remove the bowl and inspect the drive coupling on the base. Look for melted plastic, rounded teeth, or cracks.
• 2. Check knife hub: Inspect the underside of the bowl where the mixing knife connects. If the hub is cracked or loose, replace the knife assembly.
• 3. Manual rotation test: With the unit unplugged, gently rotate the drive coupling by hand. It should turn with some resistance but without slipping or grinding. Excessive play suggests internal gearbox wear.
• 4. Replace external parts first: If only the coupling or knife hub is damaged, these can usually be replaced without opening the base. Follow Vorwerk's part replacement instructions.
• 5. Internal gearbox issues: If noise persists after replacing external parts, the gearbox or motor shaft may be damaged. This requires professional disassembly and alignment.