Problem with Diplomat ADP8322 Integrated Dishwasher. ?

When I set a programme on my ADP 8322 Integrated Dishwasher and close the door I get an instant and continuous beeping sound. If I then open the door, the programme has returned to the Pre-rinse cycle. Does anyone have any suggestions as to a remedy and is there a way to reset the machine. I have read through the other questions and remedies but can't find any solutions for this model.