Diplomat 8322 starts but then stops and keeps bleping?

The dishwasher is only a couple of years old but over the past few weeks has been stopping, bleeps until you turn it off and the start light flashes. Now it seems to have stopped altogether and won't fill with water. The water supply is ok the filters are clean as is the drain pipe. When you press start and close the door it sounds like it is working then stops! Anyone got any ideas?