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Error code reference

Thermador Range Error Code F19

Miscellaneous power/relay board error / Power board communication error (Sago control).

Thermador codesThermador range codes

Miscellaneous power/relay board error / Power board communication error (Sago control).

First step from the service manual

Check all connections between the power/relay board and the control display PCB. If OK, replace power/relay board.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
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What F19 means on a Thermador range

The F19 error code on a Thermador range signals a miscellaneous power or relay board error, specifically a communication failure between the power/relay board and the control display PCB. This error is associated with the Sago control architecture, which is the internal communication system that allows the display board to send and receive signals from the power relay board. When this communication link breaks down or becomes unstable, the control system flags the fault and displays F19 to alert the technician that normal board-to-board signaling has been interrupted.

The power/relay board is a critical component responsible for routing electrical power to the various elements, relays, and subsystems of the range. The control display PCB acts as the brain, sending commands to the relay board based on user inputs. For these two boards to function correctly together, all wiring harnesses and connectors between them must be secure, undamaged, and free of corrosion or intermittent contact. A failure at any point in this communication path can produce the F19 code.

The most common root cause is a loose, damaged, or corroded connector in the wiring harness linking the two boards. Heat cycling, vibration, and general wear can cause connectors to work loose over time. If all wiring connections are confirmed to be secure and intact, the power/relay board itself is likely defective and will need to be replaced. In rarer cases, the control display PCB may also be at fault, though the diagnostic process prioritizes the relay board and its connections first.

Source: manufacturer service documentation.

Common causes of F19

  1. 01

    Loose or disconnected wiring harness

    Wiring / connection

    The connectors linking the power/relay board to the control display PCB can loosen over time due to heat and vibration. Inspect all plugs and harness connections between the two boards for any that are partially seated or have backed out.

  2. 02

    Corroded or damaged connector pins

    Wiring / connection

    Pin corrosion or physical damage at the harness connectors can interrupt the communication signal between the boards. Look for discoloration, pitting, or bent pins at each connector point.

  3. 03

    Faulty power/relay board

    Part replacement

    If all connections are confirmed secure and intact, the power/relay board itself has likely failed internally. A defective relay board will need to be replaced to restore communication with the display PCB.

  4. 04

    Damaged wiring harness

    Part replacement

    The wiring harness running between the two boards may have sustained physical damage such as chafing, pinching, or heat exposure. A damaged harness will cause intermittent or total communication loss and must be replaced.

  5. 05

    Faulty control display PCB

    Part replacement

    In less common cases, the control display PCB itself may be unable to maintain proper communication with the relay board. This is typically considered after the relay board and all connections have been ruled out as the source of the fault.

See the test procedure for each cause

Frequently asked questions about F19

What does F19 mean on a Thermador range?
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.
Can I fix the F19 error myself?
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.
Is it safe to use my Thermador range while the F19 error is displayed?
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.
Will resetting the range clear the F19 error code?
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.
How much does it cost to repair an F19 error on a Thermador range?
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.

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