Miele Washer Error Code F4254

F4254 indicates an overvoltage fault in the EFU 235 circuit, which is the inverter-based motor control system. The DC bus voltage inside this unit has exceeded 850 volts DC, triggering a protective shutdown. This is a power electronics fault that requires inspection of the motor control components and incoming power supply.

No. The F4254 fault represents a dangerous overvoltage condition in the motor control electronics. Running the machine while this fault is active risks damaging the EFU module further, causing additional component failures, or creating an electrical hazard. The washer should remain unplugged until the fault is diagnosed and repaired.

Repair costs vary depending on the root cause. If the issue is limited to a braking resistor or wiring fault, costs may be in the range of $150 to $350 including labor. If the EFU 235 control board requires full replacement, costs can rise to the range of $400 to $800 or more, depending on parts availability and local labor rates.

This fault involves high-voltage DC power electronics inside the EFU 235 motor control module. Voltages exceeding 850VDC are present in the circuit, posing a serious electrocution risk to anyone without proper training and equipment. Repair is strongly recommended to be performed by a qualified appliance technician who can safely test and replace the relevant components.

A power reset may temporarily clear the displayed fault, but if the underlying cause, such as a failed braking resistor, defective EFU board, or high line voltage, has not been corrected, the fault will return as soon as the motor control circuit reaches an overvoltage condition again. A reset is not a repair and does not make the machine safe to use.