hello to fix your DW take out the big round filter, in the sump to the right there is a plastic dome cover with a screw in it remove the screw and take the dome cover off. Inside that is three plasic pipes blue/clear/and black, take a note how they are fitted and take them out they will be all scummy clean them in water inside and out.Were you took them out look inside it with a tortch and you will see scum put a screw driver down there to dislodge it then pour some hot water down there from a kettel do not flood it out pour at a steady speed you will notice the sump fillin up this is good take out the water from the sump and refit the pipes back the way they were and refit the dome cover back refit filter and switch on and it should fill good luck PETER
PETER, July 2010