Miele Washer Error Code F4127

F4127 indicates a tachogenerator connection fault that was detected after the safety time window expired. The tachogenerator is a speed sensor on the motor that tells the control board how fast the motor is spinning. The error means the board received no valid signal from this sensor, either because of a wiring fault or a defective sensor. The machine stops the cycle automatically to prevent further damage.

No, you should not continue running the washer while F4127 is active. The machine has halted because it cannot monitor motor speed, which could allow the motor to operate in an uncontrolled state and cause further damage. The washer should remain out of service until the fault is diagnosed and repaired.

A reset may temporarily clear the F4127 code, but if the underlying fault with the tachogenerator connection or sensor itself has not been corrected, the error will return as soon as the machine attempts to run the motor again. Clearing the code without repairing the cause is not a long term solution and could mask a progressive wiring or component failure.

Some cases of F4127 are caused by a loose connector or corroded terminal, which a technically confident homeowner can address by carefully inspecting and reseating the wiring harness at the motor and control board. However, testing the tachogenerator for correct output and replacing internal components requires basic electrical knowledge and a multimeter. If the sensor or control board needs replacement, a qualified appliance technician is recommended.

Repair costs depend on the root cause. If only a loose connector needs reseating, cost may be limited to a service call fee, typically in the range of $80 to $150. A replacement tachogenerator part and labor could run $150 to $350 depending on your location and the technician. If the motor control module is at fault, costs can be significantly higher, often in the range of $300 to $600 or more.