Water inlet filter collects lime or any small objects that may be in water supplied to the appliance. Clean the water inlet filter regularly.
Turn off the water taps to the appliance if the appliance is to be left for any length of time (e.g. holiday), especially if there is no floor drain (gully) in the immediate vicinity.
Water supply error message will be displayed on the control panel when water is not entering the detergent drawer.
If the water is very hard or contains traces of limescale, the filter on the water inlet may be clogged.
Turn off the power and the water tap and then unscrew the water inlet hose.

Remove the water inlet filter with small pliers and then clean the filter using a medium bristle tooth brush.
