Wolf Cooktop Error Code E42

Error code E42 on a Wolf cooktop indicates that the temperature sensor for Generator 3, located at the right rear (RR) burner position, has developed a short circuit condition. The generator board is the integrated control and power module that drives the induction or gas ignition system for that specific burner zone. Each burner has its own dedicated generator board with an onboard temperature sensor that monitors operating heat levels to prevent overheating and ensure safe, consistent performance. When this sensor shorts, it sends an invalid signal to the control system, which interprets the reading as a fault and shuts down the affected burner as a protective measure.

A shorted temperature sensor typically means the sensor's internal resistance has dropped to near zero, collapsing the expected signal range the generator board uses for thermal monitoring. This differs from an open-circuit fault, where resistance goes to infinity. A short can result from heat damage to the sensor wiring insulation, a failed sensor element on the generator board itself, or moisture intrusion that bridges the sensor circuit. Because the temperature sensor is integrated into or closely coupled with the generator board assembly on Wolf cooktops, the recommended first diagnostic action is replacement of the affected generator board rather than attempting to isolate and replace the sensor independently.