Thermador Range Error Code F19

F19 on a Thermador range indicates a miscellaneous power or relay board error, specifically a communication failure between the power/relay board and the control display PCB. This fault is tied to the Sago control system used in Thermador ranges. It means the two boards are unable to communicate properly, which can prevent the range from operating normally. The issue is most often traced to a loose wiring connection or a failed power/relay board.

It is not recommended to continue using the range while the F19 error is active. A communication failure between the power/relay board and the control PCB can lead to unpredictable behavior, including relays not responding correctly to control commands. Until the fault is diagnosed and resolved, the range should be treated as unreliable. Disconnect power if you are not actively diagnosing the issue.

Repair costs vary depending on the root cause. If the fix involves reseating a wiring harness connector, you may only pay for a service call, typically in the range of $75 to $150. If the power/relay board needs replacement, parts plus labor costs can range from $200 to $500 or more depending on the specific model and local labor rates. The control display PCB, if that turns out to be the faulty component, can push costs higher.

Some steps are within reach for a confident DIYer. You can inspect and reseat all wiring harness connectors between the power/relay board and the control display PCB, which sometimes resolves the error if a connector has worked loose. If the connections are secure and the error persists, replacing the power/relay board is the next step, and that level of repair typically requires comfort working inside the appliance with electrical components. If you are unsure, a qualified appliance technician should handle the diagnosis and repair.

A power reset, such as turning off the circuit breaker for a few minutes and restoring power, may temporarily clear the F19 code. However, if the underlying cause is a faulty connection or a failing power/relay board, the error will return. A reset is useful for confirming whether the fault is persistent or intermittent, but it does not repair the root problem.