Miele Washer Error Code F4122

F4122 indicates a checksum fault in the monitoring standard blocks of the washer's main control unit. The control board has detected that stored data in its memory does not match the expected checksum value, signaling potential memory corruption. The machine stops operation to avoid running with compromised control logic. This is an internal electronics fault, not a sensor or mechanical failure.

A power reset may clear F4122 if the corruption was caused by a one-time power disturbance. Disconnect the machine from the outlet for a few minutes, then restore power and run a short cycle to test. If the code reappears, the fault is persistent and the control board itself will need to be serviced or replaced.

Repair costs depend on whether the control board needs replacement or if the issue can be resolved through a firmware correction. Control board replacement on a Miele washer typically ranges from $300 to $600 or more for parts and labor, depending on the specific model and local service rates. A diagnostic service call alone generally costs between $80 and $150.

A basic power reset is worth attempting first: disconnect the washer from power for several minutes and then reconnect. If the fault was caused by a transient voltage event, this may clear it. However, if F4122 returns after resetting, the control board's memory has likely failed permanently, and professional repair or board replacement is necessary.

No, you should not attempt to operate the washer while F4122 is active. The code indicates the control board's internal data integrity has been compromised, meaning the machine cannot reliably execute its programmed functions. Running the washer in this state could lead to unpredictable behavior and potential damage.