Thermador Range Error Code FC

The FC code on a Thermador range indicates a communication error detected by the display head, specifically that the second power/relay board did not power up as expected. This applies to S, SM, and SMW series models that use multiple control boards working together. The fault disrupts normal communication between the control head and the board responsible for managing power to range components.

The FC error indicates a breakdown in communication between the control boards, which means the range may not respond to controls correctly or at all. Operating a range in this condition is not recommended, as the control system cannot reliably manage heating elements. The range should remain off until the fault is diagnosed and resolved.

Repair costs vary depending on which component has failed. Wiring harness repairs or connector reseating typically involve only a service call fee, which can range from around $80 to $150 or more depending on location. Replacing the second power/relay board or display head adds parts costs that can range from $150 to $400 or higher per board, plus labor. Replacing the main power/relay board is typically the most expensive scenario.

Some causes of the FC code are accessible to a knowledgeable DIYer, particularly checking and reseating wiring harnesses and connectors between the control boards. However, if the fault persists after inspecting connections, replacing the second power/relay board, display head, or main board requires comfort working inside high-voltage appliances. If you are not experienced with appliance electronics, a qualified technician is the safer choice.

Cycling power to the range by unplugging it or switching off the circuit breaker for a few minutes may temporarily clear the FC code if the fault was caused by a transient communication glitch. However, if the underlying cause is a loose connection or a failed board, the error will return when the range powers back up. A reset alone is not a repair.