Miele Novotronic W 1986 Operating Instructions Manual page 24

Once the flow of water stops:
^ Remove the lint trap lid.
^ Clean out any foreign objects or lint
from the filter.
^ Check that the drain pump impeller
(in the back of the chamber) rotates
freely by spinning with your hand.
24
^ Clean the inside of the lint trap
housing. Remove any detergent
deposits or foreign objects from the
threads of the filter housing and filter
unit before returning the lint trap.
^ Return the lint trap and tighten into
place.
,
If the lint trap is not tightened
securely, water will leak out when the
machine is in use.
^ Run the "Fine rinse" program.
This step is necessary to activate the
ball valve.