Miele Washer Error Code F4002

The F4002 error code on a Miele washer indicates that the drum is still in motion and the door interlock system is preventing the door from being released as a safety measure. The washer's control board continuously monitors drum rotation through a tachometer or Hall effect sensor on the motor. When the control detects that the drum has not come to a complete stop, it holds the door lock engaged to prevent access to the spinning drum. This is a protective function, not a fault in the traditional sense, though it can indicate an underlying issue if the drum fails to decelerate and stop within the expected timeframe.

The most common scenario is that the drum is simply still decelerating after a spin cycle, and the error clears on its own once the drum reaches a full stop. However, if the drum is rotating abnormally slowly or oscillating without stopping, there may be a mechanical or electrical issue causing the problem. A failing motor brake, a worn drive belt, or a motor control board issue can all prevent the drum from reaching a stationary state in the expected window, triggering this code as a persistent condition.

Additionally, if the tachometer or rotation sensor is sending inaccurate signals to the control board, the board may incorrectly believe the drum is still moving even when it has stopped. This sensor-side fault can cause the door lock to remain engaged indefinitely. In these cases, the physical drum may be stationary, but the control logic continues to suppress the door release signal based on the faulty sensor reading.