Drain pump cover is not positioned correctly.
Remove the lower spray arm.
 
- Rotate the screw thread of the lower spray arm anti-clockwise (1). Pull the lower spray arm upwards to remove it (2). 

Remove the filter combination.
Remove the drain pump cover. Proceed as follows:
 
- Press the catch of the drain pump cover inwards (1). 
- Tip the cover inwards to release it (2). 
Rinse the cover thoroughly under running water and remove all foreign objects.
Refit the cover by placing it down vertically from above.
 
- Make sure that the cover is flush with the edge. 
Refit the filter combination in the dishwasher.
- Ensure that the filter combination lies flat in the base of the wash cabinet. 
Refit the lower spray arm.
