Miele Washer Error Code F4058

F4058 means the tachogenerator signal received by the control board is too small. The tachogenerator is a sensor on the drive motor that reports how fast the motor is spinning. When its output falls below the acceptable threshold, the machine cannot regulate the drum speed and will fault out. The cause is typically a failing tachogenerator, a connection problem in the motor wiring, or a worn motor.

It is not advisable to continue running the washer with this error active. Because the machine cannot accurately monitor motor speed, it may run the motor under unsafe conditions or fail unpredictably mid-cycle. Stopping use until the fault is diagnosed helps prevent potential damage to the motor or control board.

Repair costs vary depending on the root cause. If only wiring cleaning or connector repair is needed, costs can be minimal. Replacing a tachogenerator or motor typically ranges from a few hundred dollars into the higher hundreds when including parts and labor. A control board replacement would represent the higher end of that range.

Some DIY-level repair is possible, particularly checking and cleaning wiring connections along the motor harness. However, testing the tachogenerator output and replacing motor components requires basic electrical knowledge and a multimeter at minimum. If you are not comfortable working around appliance wiring, a qualified technician is recommended for this repair.

A reset may temporarily clear the code and allow a cycle to start, but F4058 will return if the underlying hardware fault is not corrected. If the tachogenerator signal remains too small, the machine will detect the condition again and stop. A reset is only useful as a quick test to confirm the fault is active and repeatable.