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Error code reference

Thermador Range Error Code F153

Control calibration values not in range / User Interface too hot.

Thermador codesThermador range codes

Control calibration values not in range / User Interface too hot.

First step from the service manual

If possible, re-calibrate. Check power and Display Board connectors P1B and associated wiring. If OK, replace Power Board.

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

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What F153 means on a Thermador range

The F153 error code on a Thermador range indicates one of two related conditions: control calibration values have fallen outside their acceptable range, or the User Interface (UI) board has reached an unsafe operating temperature. Both conditions are monitored by the Power Board, which communicates with the Display Board through connector P1B and its associated wiring harness. When calibration data stored in the control becomes corrupted or drifts outside tolerance, or when the UI temperature sensor detects overheating, the control system halts normal operation and triggers this fault.

The Display Board and Power Board work together to manage cooking functions, temperature regulation, and user input. The connection at P1B is a critical data and power pathway between these two boards. A loose, corroded, or damaged connector at P1B can interrupt signal transmission, causing the Power Board to misread calibration data or fail to receive accurate temperature feedback from the UI. Similarly, if the environment around the control panel is excessively hot due to blocked ventilation or a nearby heating element issue, the UI board itself can overheat and trigger the fault.

Diagnosis should begin with a re-calibration attempt if the unit allows access to that function. If re-calibration does not resolve the fault, the next step is a thorough inspection of connector P1B and the wiring connecting the Display Board to the Power Board. Look for bent pins, heat damage, or loose seating. If the connectors and wiring check out without defect, the likely cause is a failed Power Board, which will need to be replaced to restore proper operation.

Source: manufacturer service documentation.

Common causes of F153

  1. 01

    Loose or faulty connector at P1B

    Wiring / connection

    The connector P1B links the Display Board to the Power Board, and a loose, corroded, or damaged connection here can disrupt communication and trigger calibration errors. Inspect the connector for bent pins, heat discoloration, or incomplete seating.

  2. 02

    Corrupted or out-of-range calibration data

    Wiring / connection

    Calibration values stored in the control can drift or become corrupted due to a power surge or software fault. A re-calibration procedure through the control panel may restore correct values without requiring any parts replacement.

  3. 03

    User Interface board overheating

    Wiring / connection

    If airflow around the control panel is restricted, or if a heating component nearby is running abnormally hot, the UI board can exceed its safe temperature threshold and trigger F153. Check for blocked vents and signs of heat damage on or near the control panel.

  4. 04

    Damaged wiring harness between Display Board and Power Board

    Part replacement

    Wiring associated with connector P1B can be pinched, burned, or broken, especially near heat sources inside the range. Visually inspect the full length of the harness for insulation damage or broken conductors.

  5. 05

    Failed Power Board

    Part replacement

    If connector P1B and all associated wiring inspect correctly and re-calibration does not clear the fault, the Power Board itself is likely defective and will need to be replaced. This is the final step in the diagnostic sequence for this code.

See the test procedure for each cause

Frequently asked questions about F153

What does F153 mean on a Thermador range?
F153 on a Thermador range signals that either the control calibration values have gone outside their acceptable range or the User Interface board has detected an overtemperature condition. The Power Board monitors both of these parameters and triggers this fault when either falls outside safe limits. The error causes the range to interrupt normal operation until the issue is resolved.
Can I fix F153 on my Thermador range myself?
Some cases of F153 can be resolved by performing a re-calibration through the control panel if that option is accessible. Beyond that, fixing the fault involves inspecting connector P1B and its wiring harness for damage or loose connections, which requires accessing the interior of the range. If the boards themselves are at fault, replacing a Power Board is a task best handled by someone comfortable working with appliance electronics and internal wiring.
Is it safe to use my Thermador range while F153 is displayed?
It is not advisable to continue using the range while F153 is active. The error indicates either bad control data or an overheating condition in the control electronics, and operating the range in this state could allow the problem to worsen or create additional component damage. The range should be left off until the fault is diagnosed and cleared.
Will resetting my Thermador range clear the F153 error?
A power reset, such as turning off the circuit breaker for 30 to 60 seconds, may temporarily clear the F153 code if the fault was triggered by a transient event like a power fluctuation. However, if the underlying cause is a hardware problem such as a bad connector, damaged wiring, or a failing Power Board, the code will return. Re-calibration is a more targeted first step than a simple reset for this particular fault.
How much does it cost to repair a Thermador range showing F153?
Repair costs vary depending on what component is at fault. If only a re-calibration or connector reseating is needed, costs would primarily cover a service call, typically in the range of $100 to $200. If the Power Board requires replacement, parts and labor combined can range from $300 to $600 or more, depending on your location and service provider.

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