Thermador Oven Error Code F63

F63 on a Thermador oven means the lower oven detected an over-temperature condition while in a cooking cycle. The control board monitors temperature through an RTD sensor probe, and when readings exceed a safe limit, this fault code is triggered and the oven shuts down heating. The root cause can be a real overheating event or a faulty temperature sensor sending incorrect readings.

Resetting the oven by cutting power at the breaker for a few minutes may temporarily clear the F63 code, but if the underlying problem is not repaired, the code will return during the next cooking cycle. A reset alone does not fix a faulty RTD sensor, a stuck relay, or a defective control board. Always diagnose the root cause before relying on the oven again.

Repair costs vary depending on the faulty component. An RTD temperature sensor replacement typically runs in the range of $100 to $250 including parts and labor. Control board replacement is more expensive, generally ranging from $300 to $600 or more depending on the specific model and labor rates in your area. Getting a professional diagnostic is recommended before purchasing parts.

You should not continue using the oven while F63 is active. The code indicates the oven either reached an unsafe temperature or has a monitoring system failure, both of which need to be diagnosed before the appliance is safe to operate. Continuing to run the oven risks damage to internal components or, in a genuine overheating situation, a potential fire hazard.

Start by checking the lower oven RTD temperature sensor, as a failing probe is a common cause of this fault. Measure the sensor's resistance and compare it to the expected value for your model. If the sensor checks out, the next steps are inspecting the control board for relay damage and verifying there are no ventilation obstructions around the oven. Depending on the cause, repairs may involve replacing the RTD probe or the control board.