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Error code reference

Thermador Range Error Code E:25

WTMC dryer

Thermador codesThermador range codes

WTMC dryer: Damaged data table.

First step from the service manual

Replace faulty control module.

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

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What E:25 means on a Thermador range

The E:25 error code on a Thermador range with WTMC dryer functionality indicates a damaged or corrupted data table within the control module. The data table is a critical section of the control board's non-volatile memory that stores operational parameters, calibration values, and configuration data required for the appliance to function correctly. When this data table becomes corrupted, unreadable, or structurally damaged, the control module cannot reference the values it needs to execute normal operating sequences, triggering the E:25 fault.

This type of error is rooted in a firmware or memory-level failure within the control module itself. The corruption can result from power surge events, voltage irregularities during operation, or internal component degradation on the control board. Unlike sensor-related faults that point to a specific external component, E:25 points directly to an integrity failure within the control electronics, meaning the board cannot self-correct through a simple reset or recalibration procedure.

Because the data table resides within the control module and cannot be reprogrammed in the field under typical service conditions, the corrective action is replacement of the faulty control module. Attempting to continue operating the appliance with a corrupted data table can result in unpredictable behavior or failure of core functions. Technicians should confirm the fault is not caused by intermittent power supply issues before installing a replacement board, as a defective power supply could damage a new module in the same way.

Source: manufacturer service documentation.

Common causes of E:25

  1. 01

    Corrupted control module memory

    Part replacement

    The non-volatile memory storing the data table on the control board has become corrupted or damaged, making the table unreadable. This is the primary and most direct cause of E:25 and requires control module replacement.

  2. 02

    Power surge or voltage spike

    Part replacement

    A sudden voltage surge can damage the internal memory components of the control board, corrupting stored data tables. Checking for signs of burn marks or damaged components on the board can help confirm this cause.

  3. 03

    Gradual control board component degradation

    Part replacement

    Over time, electronic components on the control module can degrade, leading to memory read and write failures. This type of failure tends to appear on older units and is identified by the persistent nature of the fault across multiple power cycles.

  4. 04

    Unstable power supply to the control module

    Wiring / connection

    If the internal power supply provides inconsistent voltage to the control board, it can cause repeated data corruption. Technicians should verify stable voltage delivery to the board before replacing it to avoid damaging a new module.

See the test procedure for each cause

Frequently asked questions about E:25

What does E:25 mean on a Thermador range?
E:25 on a Thermador range with WTMC dryer functionality indicates a damaged data table within the control module. The control board cannot read the stored parameters it needs to operate correctly. This is an internal electronics fault rather than a sensor or mechanical issue. Resolution typically requires replacing the control module.
Can I fix the E:25 error myself, or do I need a technician?
The E:25 error requires replacing the control module, which involves working with the main electronics of the appliance. While a knowledgeable DIYer with experience in appliance electronics may be able to perform the replacement, most homeowners will want to call a qualified technician to ensure safe and correct installation.
Is it safe to keep using my Thermador range when E:25 is displayed?
Continuing to operate the appliance with a corrupted data table can result in unpredictable behavior from the control system. It is best to stop using the unit until the faulty control module has been replaced. Using it in this state could lead to further damage or unsafe operation.
Will resetting the appliance clear the E:25 error?
A simple power reset will not clear E:25 because the fault is caused by corrupted or damaged data stored within the control module itself. The error will return after the reset since the underlying memory issue persists. Control module replacement is required to resolve this fault permanently.
How much does it cost to fix a Thermador E:25 error?
Repair costs for E:25 typically involve the price of a replacement control module plus labor for installation. Parts costs for control modules on Thermador appliances generally range from $150 to $450 or more depending on the specific model. With professional labor included, total repair costs commonly fall in the range of $250 to $600 or higher.

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