Sometimes you can get a small object jamming the drain pump impeller. You can clear the blockage from inside the washing chamber.
Remove the filters and bail out the water. Right at the very bottom of the sump you may notice a plastic cover held in place by a single security screw - Torx usually.
Under the cover is the impeller of the drain pump - it should move freely but with a bit of magnetic resistance. Tweezers will help to clear away any crud that may be making it stall.
Well - this is how my machine is...
Good luck...
Peccavi
March 2011