Thermador Range Error Code F8

The F8 code on a Thermador range indicates an analog/digital supervisory error, meaning the control system detected a problem with internal signal communication and canceled the active cook mode as a safety measure. On S, SM, and SMW models, a shorted meat probe can also trigger this specific code. The range halts cooking automatically when this fault appears. Pressing the Cancel key is the recommended first step to attempt a reset.

When the F8 code is active, the range cancels cook mode automatically, so continued cooking is not possible until the fault is cleared. You should not attempt to bypass the fault to resume cooking. If the code clears with a reset and does not return, normal use can continue, but a recurring F8 code should be diagnosed and repaired before the range is used regularly.

Yes, on Thermador S, SM, and SMW model ranges, a shorted meat probe is a documented cause of the F8 error code. The probe feeds analog temperature data into the control system, and a short in the probe or its circuit corrupts the signal enough to trigger the supervisory fault. Disconnecting the meat probe and resetting the range is a recommended early diagnostic step on these models to determine if the probe is responsible.

Pressing Cancel will reset the control and may clear the F8 code if the fault was caused by a transient power issue or brief signal anomaly. However, if the code returns after resetting, the underlying cause is likely a hardware failure in the clock assembly, the main power and relay board, or a shorted meat probe on applicable models. A reset that does not hold requires further component-level diagnosis.

Repair costs vary depending on which component has failed. Replacing a meat probe is generally the least expensive fix, typically in the range of $30 to $80 for the part. A clock assembly replacement can range from $150 to $350 or more depending on the model, and a main power or relay board can cost $200 to $500 or higher for parts alone. Labor costs from a qualified technician will add to these figures.