Simpson Eziset 950 continuously pumping?

Hi, I have a Simpson Eziset 950 (now 7 years old) that fills the machine with water, agitates and goes through the intial wash cycle perfectly. Then when the machine drains, the pump continues to run even after all the water has been expelled - the machine will not advance through the cycle, the pump just continues to run and the timer does not count down at all. Any help would be appreciated