The filter combination is dirty.
Clean the filter combination as follows:
Turn off the dishwasher.
Turn the handle counterclockwise to release the filter combination.
Remove the filter combination.
Remove and dispose of any coarse particles.
Rinse the filter under running water.
Clean the inside of the filter as follows:
Press the recessed grips together in the direction of the arrows (1). Keep the recessed grips held and open the filter flap (2).
Rinse all the parts under running water.
Then close the flap on the inside of the filter so that the catch fully engages.
Reinstall the filter combination so that it lies flat in the base of the wash cabinet.
Turn the handle of the filter combination clockwise until both arrows point toward each other.