Miele Washer Error Code F4261

The F4261 error code on a Miele washer indicates a fault with the EFU (electronic frequency control unit) related to the tachogenerator signal. Specifically, the control system is either not receiving any tacho impulses from tachogenerator G1, or the signal it is receiving is being detected as irregular or faulty. The tachogenerator is a small generator mounted on the motor that produces electrical pulses proportional to motor speed. These pulses allow the control board to monitor and regulate drum rotation speed in real time. Without a valid tacho signal, the controller cannot confirm whether the motor is running at the correct speed or running at all, which triggers this fault.

The most common causes of F4261 involve the wiring harness and connections between the tachogenerator and the control board, or physical damage to the tachogenerator itself. Broken, corroded, or loose connector pins along the tacho signal circuit will interrupt the pulse stream and produce this error. The tachogenerator coil can also fail internally, producing no output even when the motor is spinning. In some cases, the motor itself may have seized or developed a fault that prevents rotation, which means the tachogenerator never generates pulses to begin with.

Diagnosis should begin with a visual inspection of the wiring harness running from the motor and tachogenerator to the main control board, checking for chafing, broken wires, or corroded connectors. The tachogenerator coil resistance can then be measured and compared against expected values. If wiring and the tachogenerator both check out, the motor itself and the EFU control board become the focus of further testing.