KitchenAid Cooktop Error Code c3

The C3 error code on a KitchenAid cooktop indicates a radiator temperature failure, specifically that the surface cooking area has exceeded its safe operating temperature threshold. The cooktop's thermal monitoring system continuously tracks heat levels at the radiant element or cooking zone. When the detected temperature surpasses the acceptable limit, the control board triggers the C3 code and shuts down the affected zone to prevent damage to internal components or a potential safety hazard.

This type of overheat condition is typically detected by a thermistor or thermal limiter positioned beneath or adjacent to the cooking surface. These sensors send resistance or voltage signals to the control board corresponding to temperature levels. When the signal indicates temperatures beyond the programmed ceiling, the board interprets this as a radiator failure state and halts operation. In some cases, a faulty sensor can report falsely elevated temperatures even when actual surface heat is within normal range.

Common contributing factors include blocked ventilation around the cooktop, extended high-heat cooking sessions, a malfunctioning temperature sensor, or a defective control board that misreads sensor input. In induction or radiant models, a failed cooling fan, if present, can also allow heat to accumulate rapidly beneath the glass surface. Addressing the root cause rather than simply resetting the unit is important, as repeated overheat events can degrade the glass ceramic surface, internal wiring, or control electronics over time.