mypros+
Error code reference

Miele Washer Error Code F4170

Internal fault control with data backup of service settings; checksum incorrect.

Miele codesMiele washer codes

Internal fault control with data backup of service settings; checksum incorrect.

MyPros+ Max

Get the full diagnostic procedure for F4170.

  • 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
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What F4170 means on a Miele washer

Error code F4170 on a Miele washer indicates an internal fault within the main control unit related to its data backup function for service settings. Specifically, the checksum stored in the non-volatile memory (typically EEPROM) does not match the expected value, meaning the control board has detected corruption or loss of the service configuration data it uses to operate correctly. The checksum is a calculated value the control uses to verify that stored data is intact. When this verification fails, the control flags F4170 to prevent operation under potentially incorrect parameters.

The service settings stored in this memory include calibration values, configuration parameters, and operational thresholds that are written during factory setup or after a technician service procedure. Corruption of this data can result from power surges, voltage fluctuations during a cycle, a failing control board, or data degradation in the memory chip over time. Because the control cannot confirm the integrity of its own configuration, it will not allow normal operation to proceed.

Diagnosing F4170 typically requires access to Miele service diagnostic software or a trained technician who can attempt to reload or reset the service settings on the control board. In many cases, the control board itself must be replaced if the memory cannot be restored, as the fault points directly to the integrity of the board's internal data storage rather than any external component.

Source: manufacturer service documentation.

Common causes of F4170

  1. 01

    Corrupted control board EEPROM memory

    Part replacement

    The non-volatile memory chip on the control board can develop data errors over time or after a power event, causing the stored checksum to no longer match the saved service settings. This is the most direct cause of F4170 and often requires control board replacement.

  2. 02

    Power surge or voltage spike

    Wiring / connection

    A sudden surge or interruption in power supply during operation can corrupt the data written to the control board's memory. Check for any history of power outages or electrical events coinciding with the error appearing.

  3. 03

    Failed or failing control board

    Part replacement

    A deteriorating main control board may lose the ability to reliably read or write its internal memory, triggering checksum errors. Signs include intermittent faults or multiple unrelated error codes appearing around the same time.

  4. 04

    Incomplete or interrupted service programming

    Wiring / connection

    If a technician previously performed a service procedure and the programming sequence was interrupted before completion, the stored checksum may be left in an invalid state. This can sometimes be resolved by a technician reloading the service settings via diagnostic software.

  5. 05

    Long-term data degradation

    Part replacement

    EEPROM memory chips have a finite number of read and write cycles. On older machines, natural degradation of the memory can cause stored values to drift, eventually producing a checksum mismatch. This typically requires control board replacement.

See the test procedure for each cause

Frequently asked questions about F4170

What does F4170 mean on a Miele washer?
F4170 indicates an internal fault in the main control board related to its service settings backup. The control has detected that the checksum for its stored configuration data is incorrect, meaning the data may be corrupted or lost. The machine stops operation to avoid running on invalid parameters. This fault points directly to the control board's internal memory.
Can I fix F4170 myself on a Miele washer?
This fault is difficult to resolve without specialized Miele diagnostic software and technical training. The error involves internal control board memory that is not user-accessible. A qualified technician may be able to reload the service settings if the hardware is still functional, but in many cases the control board will need to be replaced.
Is it safe to continue using my Miele washer with error F4170?
No, you should not continue using the washer while F4170 is active. The control board cannot confirm that its own operating parameters are intact, so running the machine could result in incorrect cycle behavior. It is best to leave the washer unplugged until a technician has diagnosed and resolved the fault.
Will resetting my Miele washer clear the F4170 error?
A simple power reset is unlikely to permanently clear F4170 because the fault is caused by corrupted or missing data in the control board's non-volatile memory. Even if the error disappears briefly after a reset, it will typically return because the underlying memory issue has not been corrected. Proper repair requires either restoring the service data or replacing the control board.
How much does it cost to repair a Miele washer with error F4170?
Repair costs vary depending on whether the service settings can be restored via software or whether the control board requires full replacement. If only a technician service visit and software reprogramming are needed, costs may range from roughly $150 to $300. If control board replacement is required, total costs including parts and labor typically range from $400 to $800 or more, depending on the model and part availability.

Related Miele washer codes

All Miele washer codes
View all 254 Miele washer codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass