Miele Washer Error Code F4

F4 indicates that the washer's control board detected no drum or drive movement when movement was expected. The Tachogenerator, a sensor that monitors drum rotation speed by reading the motor shaft, reported either no signal or an abnormal signal. This causes the washer to stop the cycle to prevent motor or component damage. The fault can be mechanical, such as a blocked drum or broken belt, or electrical, such as a wiring fault or failed motor.

No, you should not continue running the washer when F4 is active. The fault indicates the drum is not moving correctly, which means laundry is not being washed properly and the motor may be straining against a blockage. Continued operation under these conditions can cause additional damage to the motor, bearings, or control board. Leave the washer off until the underlying cause is diagnosed and corrected.

Repair costs vary widely depending on the cause. Clearing a drum obstruction or reseating a connector may cost nothing beyond a service call fee, typically in the range of $75 to $150. Replacing a drive belt generally falls in the $100 to $250 range including labor. A main motor replacement on a Miele washer is more involved and parts costs alone can range from $150 to $400 or more, with total repair costs potentially reaching $300 to $600 depending on the technician and region.

Some causes of F4 are accessible to a knowledgeable DIYer. Checking for drum obstructions, inspecting the drive belt, and examining wiring connections for visible damage or corrosion are reasonable first steps with the washer unplugged. However, testing the Tachogenerator circuit, evaluating motor brush condition, and replacing internal drive components typically require disassembly and a basic understanding of electrical testing, so professional service may be appropriate for those steps.

Resetting the washer may temporarily clear the F4 code, but it will return as soon as the machine attempts to run the drum again if the underlying problem has not been fixed. A reset does not resolve mechanical obstructions, a broken drive belt, a failed motor, or a wiring fault. The code should be used as a diagnostic starting point, not something to repeatedly reset without investigation.