Miele Washer Error Code F4258

F4258 indicates a fault in the EFU 235 current monitoring system. One or more current sensors are producing readings that fall outside permissible values, causing the machine to stop as a protective measure. The fault requires hands-on diagnosis to determine whether the sensors, wiring, connectors, or the EFU module itself are responsible.

No, you should not continue operating the washer while F4258 is active. The error indicates that electrical current monitoring has detected impermissible values, which means the machine cannot verify that its circuits are operating safely. Continued use could risk further component damage or create unsafe electrical conditions.

A power reset may temporarily clear the displayed code, but if the underlying sensor fault still exists the error will return as soon as the machine attempts to operate and the EFU monitoring circuit runs its checks again. A reset alone does not fix the hardware issue causing F4258, so professional diagnosis is still necessary.

Basic checks such as inspecting visible wiring and connector condition can be done by a knowledgeable DIYer, but accurately diagnosing current sensor output and testing EFU circuit components requires electrical diagnostic tools and familiarity with Miele's control architecture. In most cases, a qualified appliance technician should perform the repair to avoid misdiagnosis or damage to other components.

Repair costs depend on which components need replacement. Wiring or connector repairs are generally on the lower end, typically in the range of $100 to $250 including labor. Sensor replacement parts can add $50 to $200 depending on the specific component, while EFU module replacement is the most expensive scenario and could bring total costs to $400 or more.