Miele Washer Error Code F4100

F4100 indicates a fault with the data memory system, specifically the data flash card. This card stores machine-specific configuration and operational data that the control board needs to run wash cycles. When the board cannot read or write to this memory, it triggers the F4100 fault and stops normal operation.

No, you should not continue using the washer while this fault is active. The machine has halted because it cannot access the data it needs to operate correctly, and attempting to force operation could result in incorrect cycle behavior or further damage to the control electronics.

A simple power reset is unlikely to permanently clear F4100 because the fault points to a hardware or data integrity issue with the memory card, not a temporary software glitch. The error may disappear briefly after a reset but will return if the underlying problem with the data flash card is not resolved.

This fault is difficult to resolve without professional knowledge and equipment. The data flash card requires reprogramming specific to your machine if it needs to be replaced, and diagnosing whether the card, its connections, or the control board is at fault requires hands-on inspection of internal components. DIY attempts are not recommended for this particular error.

Repair costs will vary depending on what component needs replacement. A data flash card replacement combined with reprogramming and a service call could range from a few hundred dollars into the higher hundreds, particularly if the main control board is also involved. Getting a diagnostic assessment from a Miele-authorized technician will give you a more accurate estimate.