F42 displayed; circulation pump may run at incorrect speed or not at all.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Defective circulation pump tachometer sensor, Faulty inverter electronics on pump, Wiring fault between pump and control board

Safety: Disconnect mains power and close water supply.

Access pump: Remove the base panel to access the circulation pump assembly.
Check wiring: Inspect the multi-pin connector to the pump for loose contacts or water damage.
Visual inspection: Look for signs of overheating or cracks on the pump housing.
Replace pump: If wiring is intact and F42 persists, replace the complete circulation pump/inverter assembly as Miele typically supplies it as one unit.

Professional Required 5/5

Circulation Pump with Tachometer / Inverter

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