C11 error appears when trying to start the motor, often after the bowl has been removed and reinserted.

Safety first: Disconnect from mains before inspecting the locking mechanism.

• Reseat the bowl: Remove the bowl completely and reinsert it firmly, ensuring it is fully seated and locked according to the manual.
• Check locking arms: Inspect the side arms or locking mechanism for cracks, excessive play, or misalignment. Replace damaged parts.
• Clean contact areas: Wipe the bowl base and the machine’s bowl support area to remove any food residue that might prevent proper seating.
• Advanced sensor check: With the unit unplugged, access the bowl detection switch or sensor and verify that it actuates when the bowl is locked in place. Adjust or replace if necessary.
• Service action: If mechanical parts are intact but C11 persists, the detection sensor or main PCB input may be defective and should be replaced by a technician.