our one does the same thing there is some sort of sensor in the base
the smallest amount of water will make the pump stay on continuously
sounds silly but its what the experts do
pull the machine out and tip it on a 45 degree angle
this should get rid of any water
this water seems to appear when the power is turned off mid cycle
if you need to stop the machine just open the door
hope this helps
worked for us
richie
January 2014