C170 error, appliance reports scale or boiling detection issue; heating may be limited

Safety first: Unplug and allow the bowl to cool before descaling.

• 1. Descale bowl: Fill the bowl with a mixture of water and food-safe descaler (or vinegar solution if permitted by Vorwerk) and run a heating cycle according to the manual. Rinse thoroughly afterward.
• 2. Clean bowl underside: Wipe the underside of the bowl and the contact area on the base with a soft, damp cloth, then dry completely.
• 3. Avoid abrasive cleaners: Do not scratch the base of the bowl; this can affect heat transfer and sensor readings.
• 4. Test with fresh water: After cleaning, heat 1 liter of water to 100°C and observe. If C170 reappears, internal sensors or control logic may be at fault.
• 5. Service if persistent: A technician may need to inspect the temperature sensors, heating element, and control board.