mine did the same and i got told to replace the brushes, which are carbon things that sit alongside the drum - access them by taking off the top of the washer. they are about £12 for a pair. once replaced, my washer worked ok for about three months. however, it is now doing the same thing again! currently water is stuck inside and the drain mode does not work! usually i can unhook the drainage pipe and drain it manually by putting it in a bowl at ground level. but now this won't work and i too have a load of water stuck in the drum and cannot open the door. so the brushes might be a temp fix and seem to go again pretty quickly.
karen
May 2010