Wolf Oven Error Code 5121

Error code 5121 means the oven control system detected an excessively high temperature inside the upper or single oven cavity during normal cooking operation, outside of a self-clean cycle. The oven shuts down as a protective response. The fault can be caused by a defective temperature sensor reporting false readings, a runaway heating element, or a failed relay on the control board.

Resetting the oven by disconnecting power for several minutes may temporarily clear the fault display, but if the underlying issue such as a faulty sensor, failed relay, or damaged element is still present, the 5121 code will return once the oven is operated again. A reset alone is not a repair and should only be used as part of the diagnostic process.

Repair costs vary depending on the root cause. Replacing a temperature sensor typically falls in the range of $150 to $350 including parts and labor. Control board replacement is more costly, generally ranging from $400 to $900 or more depending on the specific model. Heating element replacement usually falls between $200 and $450. Getting a professional diagnostic assessment first helps avoid replacing components unnecessarily.

No, you should not continue using the oven until the cause of the 5121 fault has been diagnosed and repaired. The error indicates a potential overheating condition, and operating the oven without resolving the fault could pose a fire hazard or cause additional damage to internal components. Disconnect power to the appliance until a qualified technician can inspect it.

Start by placing a calibrated independent thermometer inside the cavity and running the oven to determine whether the temperature is actually elevated or within normal range. If the temperature is normal, the fault likely originates from the temperature sensor or its wiring. If the oven is genuinely overheating, inspect the control board relay and heating elements. A qualified technician should perform resistance testing on the sensor and component-level evaluation of the control board.