C1 appears on the display and the cooker will not heat.

Safety first: Unplug the unit before inspection.

• Factory reset: Perform a factory reset if supported by your KitchenAid model (see user manual). This can clear calibration errors.
• Check for physical damage: Remove the inner pot and inspect the center sensor bump on the heating plate. If it is bent or pushed in, the sensor may not read correctly.
• Avoid heavy impact: Do not bang or drop the inner pot into the cooker, as this can damage sensor calibration.
• When to call a technician: Persistent C1 errors usually require sensor or control board replacement and recalibration by a service professional.