Gaggenau Oven Error Code F 15

F 15 indicates a short-circuit has been detected in the NTC housing sensor or the relay electronics associated with it. The NTC sensor is a thermistor that monitors internal oven housing temperature, and a short-circuit drives its resistance abnormally low. The oven stops operating to prevent unsafe conditions caused by unregulated heating. The fault requires diagnosis of the sensor, its wiring, and the relay board.

No, the oven should not be used while F 15 is active. A short-circuit in the NTC sensor or relay electronics means the oven may not correctly regulate heating element operation, which creates a risk of overheating. Discontinue use until the fault has been diagnosed and resolved.

Repair costs vary depending on which component has failed. Replacing an NTC housing sensor typically falls in the range of $80 to $200 including parts and labor. Relay electronics board replacement is more expensive, generally ranging from $200 to $600 or more depending on the specific board and labor time. Getting a professional diagnosis first helps avoid replacing parts unnecessarily.

Some causes, such as a loose connector or moisture contamination at the sensor terminals, can be addressed by a knowledgeable DIYer after disconnecting power to the oven. However, testing NTC sensor resistance, inspecting wiring harnesses for shorts, and evaluating the relay electronics board requires basic electrical diagnostic skills and a multimeter. If the sensor or relay board needs replacement, a qualified appliance technician is recommended to ensure correct parts and safe reassembly.

Cycling power to the oven may temporarily clear the display, but the fault will return if the underlying short-circuit condition still exists in the sensor or relay electronics. A reset does not repair a shorted component or damaged wiring. A proper diagnosis should be completed rather than relying on repeated resets.