Check the waste/outlet hose is unobstructed first, If all seems ok here, lower the end of the hose into a bowl, if water does not come out it indicates a blockage somewhere, filter is underneath the drum at the rear, remove the lower back panel to access. If this is all clear there may be something jamming the pump, this is also easily accessible from the rear panel. Make sure m/c is disconnected from mains supply before investigating, also watch your hands on sharp edges and the spring clips that retain the sump hose.
Regards,
Mark.
Markone, May 2007