Thermador Oven Error Code F3

F3 on a Thermador oven indicates an open sensor circuit in the oven temperature sensing system. The fault activates only when the oven is in heat mode and the control board cannot receive a signal from the temperature sensor. It points to a break somewhere in the circuit path between the sensor probe and the control board. The cooling fans will continue to run after the oven is turned off until the fault is corrected or power is cut at the breaker.

No, you should not attempt to use the oven while F3 is active. Because the temperature sensor circuit is open, the control board has no way to monitor or regulate the oven temperature, which creates a risk of overheating. Stop using the oven and address the fault before resuming normal operation.

Repair costs depend on which component has failed. A replacement oven temperature sensor probe typically costs in the range of $20 to $80 for the part, with additional labor if a technician performs the work. A wiring harness repair or control board replacement will cost more, generally ranging from $150 to $400 or higher depending on parts and labor rates in your area.

Some causes of F3 are DIY-friendly, such as reseating a loose connector at the sensor or control board. Testing and replacing the oven temperature sensor probe is also a task many experienced DIYers can handle with basic tools and a multimeter. However, if the wiring harness is damaged or the control board is at fault, professional repair is recommended to avoid further damage.

A reset by turning the oven off at the control panel will not clear F3 or stop the cooling fans while the open sensor circuit remains. Tripping the house circuit breaker will cut power and stop the fans, but the code will return as soon as the oven is powered back on and attempts to heat. The underlying open circuit fault must be corrected to permanently clear F3.