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Error code reference

Thermador Range Error Code F25

Multiple touch input keys stuck / Keys stuck (Sago control).

Thermador codesThermador range codes

Multiple touch input keys stuck / Keys stuck (Sago control).

First step from the service manual

Check all connections between the control display PCB and the touch panel. Replace control display PCB, if persists replace touch panel.

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

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What F25 means on a Thermador range

The F25 error code on a Thermador range signals that multiple touch input keys on the control panel are registering as stuck or continuously activated. This condition is detected by the Sago control system, which monitors the capacitive or membrane touch inputs for abnormal sustained activation states. When more than one key is flagged as stuck simultaneously, the control logic interprets this as a fault condition and halts normal operation to prevent unintended commands from being executed.

The most common source of this fault is a communication or connection problem between the control display PCB and the touch panel assembly. Corroded, loose, or damaged ribbon cable connectors can cause false input signals that mimic stuck keys. Moisture intrusion is another frequent contributor, as liquid that seeps beneath the touch panel surface can bridge contacts and create persistent electrical signals across multiple input zones.

If connection checks do not resolve the fault, the control display PCB itself may be misreading input signals due to component failure on the board. In cases where the PCB is confirmed functional, the touch panel membrane or capacitive overlay has likely degraded or failed internally, requiring replacement. The diagnostic sequence follows this logic: inspect and reseat all connections first, then replace the control display PCB, and if the F25 error persists, replace the touch panel as the final step.

Source: manufacturer service documentation.

Common causes of F25

  1. 01

    Loose or damaged ribbon cable connection

    Wiring / connection

    The ribbon cable or connector linking the touch panel to the control display PCB can become loose, corroded, or bent, causing multiple input lines to read as continuously active. Inspect the connector seats on both ends of the cable for damage or debris.

  2. 02

    Moisture or contamination under the touch panel

    Wiring / connection

    Liquid spills or steam that migrates beneath the touch panel surface can bridge multiple input contacts simultaneously, triggering the stuck-key fault. Look for visible residue, fogging, or discoloration behind the panel overlay.

  3. 03

    Failed control display PCB

    Part replacement

    A defective control display PCB may incorrectly interpret input signals from the touch panel, generating false stuck-key readings even when the panel itself is undamaged. This is identified by eliminating connection and panel issues first.

  4. 04

    Worn or failed touch panel assembly

    Part replacement

    The touch panel membrane or capacitive layer can degrade over time, causing internal shorts across multiple input zones that register as stuck keys. If replacing the PCB does not clear the fault, the touch panel itself requires replacement.

  5. 05

    Physical debris or pressure on the panel surface

    Wiring / connection

    Objects resting against the control panel, heavy grease buildup, or warped panel components can apply continuous physical pressure to touch zones, triggering a stuck-key condition. Clean the panel surface thoroughly and ensure nothing is pressing against it.

See the test procedure for each cause

Frequently asked questions about F25

What does F25 mean on a Thermador range?
The F25 error code on a Thermador range indicates that multiple touch input keys on the control panel are detected as stuck or continuously activated by the Sago control system. This prevents the range from accepting normal commands until the fault is resolved. The issue can originate from a faulty connection between the control display PCB and the touch panel, a failed PCB, or a damaged touch panel assembly.
Can I fix the F25 error myself, or do I need a technician?
A knowledgeable DIYer can start by power cycling the range and inspecting the ribbon cable connections between the touch panel and the control display PCB, as a loose connection is the most common cause. If the error persists after reseating all connections and cleaning the panel surface, replacing the control display PCB or touch panel typically requires some comfort with disassembly and working around electronic components. If you are not confident handling these steps, a qualified appliance repair technician is recommended.
Is it safe to use my Thermador range while the F25 error is showing?
It is not advisable to continue using the range while the F25 fault is active. Stuck or falsely activated input keys can cause unintended commands to be sent to the control system, which creates unpredictable operating behavior. Discontinue use and address the fault before resuming cooking.
Will resetting the range clear the F25 error code?
A power reset by disconnecting the range from its power source for several minutes may temporarily clear the F25 code, but the error will return if the underlying cause is not corrected. A loose connection that is intermittent might not trigger the fault immediately after a reset, giving the impression it is resolved. Thorough inspection of the touch panel connections and components is necessary for a permanent fix.
How much does it cost to repair a Thermador range F25 error?
Repair costs vary depending on which component requires replacement. If only reseating connections resolves the issue, the cost is minimal and may only involve a service call fee, typically in the range of $75 to $150. Replacing the control display PCB generally costs between $150 and $400 in parts, and a touch panel assembly can range from $100 to $350, with labor added on top if a technician performs the work.

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