Diplomat dishwasher won't end programme?

I have a diplomat adp 8902 and a while ago I opened it at the start of a programme. I have since had the 4 and 5 programme lights flashing. The manual says to hold the programme button down until it beeps then close the door and it will finish the cycle. Done this several times but even after leaving it over night there is still the same 2 flashing lights. Any other thoughts?