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Error code reference

Miele Washer Error Code F4118

Checksum fault for monitoring operating fault statistics in control.

Miele codesMiele washer codes

Checksum fault for monitoring operating fault statistics in control.

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What F4118 means on a Miele washer

F4118 is a checksum fault related to the monitoring of operating fault statistics stored within 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 washer's control unit reads back stored fault history or operational data and the recalculated checksum does not match the stored checksum, the control flags F4118 to indicate that the stored data has been corrupted or cannot be trusted.

This type of fault points directly to the control board as the primary suspect. The memory corruption can occur due to a power surge or voltage spike that disrupts a write operation to the control's memory, gradual degradation of the memory cells on the board, or a firmware inconsistency following a partial update or reset cycle. Because the fault statistics monitoring system is a background integrity function, F4118 does not necessarily mean the washer's core wash functions have failed, but the control cannot confirm the reliability of its own internal diagnostic history.

In practice, F4118 is not resolved by simply clearing the error through a power cycle, because the underlying memory checksum mismatch persists in the control hardware itself. Resolving this fault typically requires either a control board reprogram (if supported by service tooling) or full replacement of the main control unit. A qualified technician with access to Miele service diagnostic software may be able to attempt a memory reset or firmware reflash before committing to a board replacement.

Source: manufacturer service documentation.

Common causes of F4118

  1. 01

    Control board memory corruption

    Part replacement

    The EEPROM or flash memory on the main control board has developed corrupted data, causing the checksum verification to fail. This is the most direct cause of F4118 and typically requires board reprogramming or replacement.

  2. 02

    Power surge or voltage spike

    Wiring / connection

    A sudden surge in electrical supply voltage can interrupt a memory write cycle on the control board, leaving stored fault statistics in a corrupted state. Check if the error appeared after a power outage or electrical event.

  3. 03

    Degraded control board components

    Part replacement

    Over time, memory chips and supporting components on the control board can degrade, leading to unreliable data storage and checksum mismatches. This is more common on older machines with high cycle counts.

  4. 04

    Incomplete firmware update or reset

    Wiring / connection

    If a firmware update or a service-level reset was interrupted or performed incorrectly, the control's stored data structures may be left in an inconsistent state, triggering a checksum fault.

See the test procedure for each cause

Frequently asked questions about F4118

What does F4118 mean on a Miele washer?
F4118 indicates a checksum fault in the control board's monitoring of operating fault statistics. The control unit stores internal diagnostic data and uses a checksum to verify that data has not been corrupted. When the stored checksum and the recalculated value do not match, the control flags F4118. This points to a memory integrity issue within the main control board.
Can I fix F4118 on my Miele washer myself?
F4118 is not a fault that can typically be resolved through user-level troubleshooting. The issue lies within the control board's internal memory, which requires service diagnostic software to reprogram or a full board replacement. It is recommended to contact a Miele-certified technician who has the tools to address control board memory faults.
Is it safe to continue using my Miele washer with error F4118?
The washer may still be able to run cycles depending on how the control handles the fault, but operating with a confirmed memory integrity error means the control's internal diagnostic history cannot be trusted. There is also a risk that additional faults could go undetected or be logged unreliably. It is advisable to have the machine serviced before continued regular use.
How much does it cost to repair a Miele washer showing F4118?
Repair costs depend on whether the control board can be reprogrammed or needs full replacement. Control board reprogramming by a technician may cost less than a full board swap, but if replacement is needed, parts and labor costs for a Miele main control board typically range from $300 to $700 or more depending on the model and region. Getting a diagnostic quote from a certified technician is the best first step.
Will resetting my Miele washer clear the F4118 error?
A simple power cycle or user reset will not clear F4118 because the fault is caused by a persistent checksum mismatch in the control board's memory, not a temporary software glitch. The corrupted data remains stored on the board regardless of power resets. Clearing this fault requires service-level intervention, such as a firmware reflash or control board replacement.

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