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Error code reference

Thermador Range Error Code Er:23

WFR 2460 washer

Thermador codesThermador range codes

WFR 2460 washer: Foam detected.

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What Er:23 means on a Thermador range

Er:23 on a Thermador range equipped with the WFR 2460 washer module indicates that the system has detected foam during an operational cycle. This error is generated when foam levels rise beyond acceptable thresholds within the washer compartment, triggering a sensor response that halts or interrupts the cycle to prevent overflow, pump damage, or spillage into surrounding components. The WFR 2460 is a specialized washing or rinsing subsystem integrated into select Thermador range models, and its foam detection circuit monitors fluid conditions continuously during operation.

The most common root cause of this error is the use of an incorrect detergent type or an excessive quantity of detergent. High-sudsing soaps that are not formulated for this type of appliance system can generate foam volumes that overwhelm the compartment rapidly. Even a small amount of a non-approved soap can produce a persistent foam condition that the sensor will flag immediately.

Additionally, residual detergent buildup inside the washer drum or sump area can reactivate and foam when hot water is introduced, even without fresh soap being added. Mechanical issues such as a faulty foam sensor producing false positives are also possible, though less frequent. Resolving Er:23 typically begins with verifying detergent type and quantity, thoroughly rinsing the interior of the washer compartment, and running a clean cycle before attempting normal operation again.

Source: manufacturer service documentation.

Common causes of Er:23

  1. 01

    Wrong detergent type used

    Wiring / connection

    High-sudsing or non-approved detergents generate excessive foam that the WFR 2460's sensor detects almost immediately. Check the detergent being used and confirm it is rated for this specific washer system.

  2. 02

    Too much detergent added

    Wiring / connection

    Even a compatible detergent can cause Er:23 if the quantity exceeds the recommended amount. Reduce the detergent dose and run a rinse cycle to clear residual suds.

  3. 03

    Residual soap buildup in sump or drum

    Wiring / connection

    Detergent residue that has accumulated over multiple cycles can reactivate when exposed to hot water, creating foam without any fresh soap being added. A thorough cleaning of the washer interior and sump area is needed.

  4. 04

    Faulty foam sensor

    Part replacement

    If foam is not visually present but the error continues to trigger, the foam detection sensor itself may be malfunctioning and sending false positive readings to the control board. Replacing the sensor would be required.

  5. 05

    Contaminated water supply affecting sudsing

    Wiring / connection

    In some cases, water with high mineral content or contaminants can interact with detergent to produce abnormal foam levels. This is less common but worth considering if the error persists after correcting detergent use.

See the test procedure for each cause

Frequently asked questions about Er:23

What does Er:23 mean on a Thermador range?
Er:23 indicates that the WFR 2460 washer module built into your Thermador range has detected an excessive foam condition during operation. The appliance halts the cycle automatically to prevent overflow or pump damage. This is most often caused by using the wrong type of detergent or using too much of it. Correcting the detergent and rinsing the washer compartment usually resolves the issue.
How do I fix Er:23 on my Thermador range?
Start by identifying and removing the source of excess foam, which is typically an incompatible or overused detergent. Thoroughly clean the drum and sump area to eliminate any residual soap buildup. Run a rinse or clean cycle with no detergent added to flush remaining suds. If the error persists after these steps, the foam sensor may need to be inspected or replaced by a qualified technician.
Is Er:23 on a Thermador range dangerous?
Er:23 itself is not an immediately dangerous error, but it should not be ignored. Foam overflow can spill into electrical components or other parts of the appliance, potentially causing damage or creating a slip hazard. The appliance is designed to stop operation when this error occurs, which limits risk. Address the root cause promptly before resuming normal use.
Will resetting my Thermador range clear the Er:23 code?
A reset may temporarily clear the code, but if the underlying cause such as incorrect detergent or residual soap buildup is not addressed, the error will return during the next cycle. It is important to correct the detergent type and clean the washer compartment before resetting. Simply power cycling the appliance without resolving the foam source is not a long-term fix.
How much does it cost to repair a Thermador range showing Er:23?
If the issue is simply a detergent problem, the cost to resolve Er:23 is minimal, covering only any cleaning supplies needed. If a faulty foam sensor is diagnosed as the cause, repair costs including parts and labor typically range from around $150 to $400 or more depending on service rates in your area. Getting a diagnostic assessment from a certified Thermador technician will provide a more precise estimate for your specific situation.

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