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Error code reference

Bosch Dryer Error Code E:23

Model variant doesn't match table; dryer stops and cannot be restarted.

Bosch codesBosch dryer codes

Model variant doesn't match table; dryer stops and cannot be restarted.

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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  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
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What E:23 means on a Bosch dryer

Error code E:23 on a Bosch dryer indicates a model variant mismatch between the control module and the internal configuration table stored in the unit's software. The control module contains programming that references specific model variants, each with defined operational parameters. When the module cannot match its stored variant data to the expected configuration table, it interprets this as an irreconcilable conflict and shuts the dryer down completely. The machine will not restart until the underlying cause is resolved.

This mismatch typically occurs when a control module is replaced with a unit that carries incorrect or incompatible firmware, or when the existing module experiences internal data corruption that causes it to misread or lose its variant identification. The control module is responsible for governing all operational logic, including cycle parameters, sensor thresholds, and safety interlocks. If its variant data does not align with the table the dryer expects, the system treats the condition as a critical fault rather than a recoverable error.

Because the dryer stops and cannot be restarted after triggering E:23, standard power cycling or reset procedures will not clear the fault. The root cause is embedded at the firmware or hardware level within the control module itself. The prescribed diagnostic action is direct replacement of the control module with a correctly matched unit for the specific model variant. Attempting to operate the dryer without addressing this fault is not possible, as the system will remain locked out.

Source: manufacturer service documentation.

Common causes of E:23

  1. 01

    Incorrect replacement control module installed

    Part replacement

    A previously replaced control module may have been sourced for a different model variant, causing a firmware mismatch with the dryer's configuration table. Verify that the installed module's part number corresponds exactly to the specific model and variant of the dryer.

  2. 02

    Control module firmware corruption

    Part replacement

    Internal data corruption within the existing control module can cause it to lose or misread its variant identification, triggering E:23 even without any prior part replacement. This type of failure is typically not recoverable through reset procedures and requires module replacement.

  3. 03

    Control module failure due to power surge

    Part replacement

    A voltage spike or power surge can damage the control module's memory or processing components, resulting in corrupted variant data. If the error appeared after a power event, the module itself is likely the faulty component.

  4. 04

    Factory programming error on a new module

    Part replacement

    In some cases, a new replacement control module may have been programmed with incorrect variant data before leaving the factory. If a new module triggers E:23 immediately upon installation, this is the likely cause and the module should be exchanged.

See the test procedure for each cause

Frequently asked questions about E:23

What does E:23 mean on a Bosch dryer?
E:23 on a Bosch dryer means the control module cannot match its stored model variant data to the dryer's configuration table. This mismatch causes the dryer to stop completely and prevents it from being restarted. The fault points directly to the control module as the component that needs to be addressed. It is not a sensor or mechanical fault, but a software or hardware configuration issue within the module itself.
Will resetting my Bosch dryer clear the E:23 error?
No, a standard power reset will not clear E:23. Because the fault is caused by a model variant mismatch embedded within the control module's firmware or hardware, cycling power does not resolve the underlying conflict. The dryer will remain locked out and unable to restart until the control module is replaced with a correctly matched unit.
How do I fix the E:23 error on my Bosch dryer?
The prescribed fix for E:23 is replacement of the control module. The replacement module must be the correct variant for your specific Bosch dryer model. If the error appeared after a previous module replacement, the installed module may have been intended for a different model variant and should be replaced with the properly matched part.
Is it safe to use my Bosch dryer when E:23 is displayed?
When E:23 is active, the dryer shuts down and cannot be restarted, so continued use is not possible without resolving the fault. The dryer's control system treats this as a critical error and enforces a full lockout as a precaution. Do not attempt to bypass or override the lockout, as the control module may not be able to safely govern the dryer's operation in this state.
How much does it cost to fix a Bosch dryer E:23 error?
Repair costs for E:23 will depend on the price of the replacement control module and whether you hire a technician or replace the part yourself. Control module replacement on Bosch dryers typically falls in the range of $150 to $400 or more when including parts and professional labor, though costs can vary by region and specific model. DIY replacement can reduce costs significantly if you are comfortable working with appliance electronics.

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