sue
I have had the same problem with mine, switch off the power and water to the machine, turn the machine over so that the bottom lid is exposed, remove the srews and you will see the pump attached to the drain hose, remove the retaining screw and twist off, remove the lead and hose, check internal of the pump for a blockage, rinse with water, and rotate the internal fan blade, reinstall in back on the machine, if this fails (and mine did start again) then you will require to replace the pump unit, details of it our on the top of the pump make a note of them before you put it back in. Hopefully you will not need them.
alan, September 2008