Miele Dishwasher Error Code F5

The F5 error code on a Miele dishwasher indicates a water drain fault, meaning the control system has detected that water is not being expelled from the tub within the expected timeframe. The dishwasher monitors drain cycles using timing logic and, in some models, water level sensors or pressure switches. When the drain pump runs but water remains in the tub past the allowable window, the machine halts the cycle and triggers F5 to prevent overflow, motor damage, or contamination of cleaned items.

The drain system in a Miele dishwasher consists of several components that can each contribute to this fault. The drain pump itself is responsible for forcing water out through the drain hose and into the home plumbing. If the pump motor fails, the impeller is jammed by debris, or the pump capacitor loses capacity, the pump will not move water effectively. Blockages anywhere along the drain path, including the internal filter assembly, the sump area, the drain hose, or the household sink drain connection, can also restrict flow enough to trigger F5.

In some cases the fault is not a true mechanical blockage but rather an installation issue. A drain hose that is not routed with a proper high loop or air gap can allow backflow from the sink drain into the dishwasher sump, creating a condition where the tub never fully empties. Similarly, a recently installed garbage disposal with the drain knockout plug still in place will completely block drainage. Electrical faults such as a failed drain pump relay on the control board or broken wiring to the pump can also produce this code without any physical clog present.