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Error code reference

Miele Washer Error Code F4105

Checksum fault for monitoring block names in control.

Miele codesMiele washer codes

Checksum fault for monitoring block names in control.

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What F4105 means on a Miele washer

Error code F4105 on a Miele washer indicates a checksum fault within the monitoring block names stored in the main control unit. A checksum is a calculated value used to verify the integrity of data stored in non-volatile memory (EEPROM or flash memory) on the control board. When the control unit reads the monitoring block name data during startup or operation, it recalculates the checksum and compares it against the stored value. If these values do not match, the control determines that the stored data has been corrupted or altered, and F4105 is triggered to flag this integrity failure.

This type of fault is rooted in the control unit itself rather than in external sensors or wiring. Causes typically include memory corruption resulting from a power surge or voltage fluctuation during a wash cycle, data degradation over time in aging EEPROM cells, or a firmware issue that has caused improper data to be written to the monitoring block. In some cases, an incomplete or interrupted software update can leave the control board with mismatched data, producing a checksum error. Physical damage to the control board from moisture or heat can also corrupt stored memory values.

Because F4105 points directly to an internal data integrity failure within the control electronics, it is not a fault that can typically be resolved by inspecting external components such as sensors, valves, or wiring harnesses. Resolution generally requires either a control board reset procedure performed with Miele diagnostic software, reflashing the control unit firmware, or replacing the main control board entirely. This is a repair that in most cases requires a trained technician with access to Miele service tools.

Source: manufacturer service documentation.

Common causes of F4105

  1. 01

    Control board memory corruption

    Part replacement

    The EEPROM or flash memory on the main control board may have developed corrupted data, causing the checksum verification to fail. This can happen gradually with aging hardware or suddenly after a power event.

  2. 02

    Power surge or voltage fluctuation

    Wiring / connection

    A sudden spike or drop in supply voltage during operation can corrupt stored data in the control unit's memory. Check whether the fault appeared after a power outage or electrical disturbance.

  3. 03

    Interrupted or failed firmware update

    Wiring / connection

    If a software update to the control unit was incomplete or interrupted, mismatched or incomplete data can remain in the monitoring block, triggering a checksum fault on the next startup.

  4. 04

    Failed or failing main control board

    Part replacement

    Physical damage to the control board from moisture ingress, heat stress, or component failure can corrupt memory values permanently. Inspect the board for visible burn marks, corrosion, or moisture damage.

  5. 05

    Degraded EEPROM cells over time

    Part replacement

    Non-volatile memory chips have a finite number of read/write cycles. On older machines, individual memory cells can fail, leading to data integrity errors like F4105.

See the test procedure for each cause

Frequently asked questions about F4105

What does F4105 mean on a Miele washer?
F4105 indicates a checksum fault for monitoring block names stored in the washer's main control unit. The control board has detected that internally stored data does not pass its integrity check, meaning the data has likely become corrupted. This is an electronics-level fault within the control unit itself, not a sensor or mechanical failure.
Can I fix F4105 on my Miele washer myself?
F4105 is an internal control board data fault that typically requires Miele diagnostic software to address properly, either through a firmware reflash or a control board reset procedure. Basic user resets like unplugging the machine may clear the fault temporarily if the cause was a one-time power event, but if the fault returns, professional service is needed. Replacing the main control board is often the final resolution.
Will resetting the washer clear error code F4105?
Unplugging the washer for several minutes and restarting it may temporarily clear F4105 if the corruption was caused by a transient power issue. However, if the underlying memory on the control board is genuinely corrupted or damaged, the fault will return on the next startup or during the next cycle. A persistent F4105 requires professional diagnosis and likely a control board repair or replacement.
Is it safe to use my Miele washer when F4105 is displayed?
The washer will typically halt operation when F4105 is active, preventing the machine from running in an uncontrolled state. Attempting to bypass or repeatedly force a restart without resolving the underlying cause is not recommended, as operating with a compromised control unit could lead to unpredictable machine behavior. It is best to leave the machine off until the fault is properly diagnosed.
How much does it cost to repair F4105 on a Miele washer?
Repair costs depend on whether the fault can be resolved through a firmware or software procedure or requires a physical control board replacement. A service call for diagnostics and a software-based fix may range from $100 to $250. If the main control board needs to be replaced, total costs including parts and labor typically range from $350 to $700 or more, depending on the specific model and local labor rates.

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