Hi, I have a 3 -4 year old Whirlpool dishwasher (DWF 416 W) which has stopped running. It seems to do a cold rinse but then stops, beeps and the start light is flashing 4 times when I open the door. The water left in the washer is enough to fill a large mixing bowl – about a gallon. If I clear the start and try again all I can hear is a hum from the base. Any ideas would be appreciated. Cheers.