Diplomat fully integrated dishwasher, model ADP 8352 has stopped working, ?

My diplomat dishwasher, model ADP 8352 has developed a fault when I went to use it. I loaded the machine, added the detergent, set the programme. went back much later and when I opened the machine the dishes were still dirty and the detergent was laying in a small pile at the bottom of the machine. there does not seem to be any flashing lights from the control panel. can anyone advise me what to do to fix this?