I had problems with mine too when it was first installed. I think they have a known fault on some of the ADP8352. Basically it has to do with the water discharge. I called the service line and they replaced it (08457 959 722)
They told me that it can also be caused by people using dishwasher tablets instead of loose powder as the tablets have too much detergent for the dishwasher to cope with and it clogs up the plumbing. The poor excuse for a manual provided with the dishwasher mentions that the use of tablet is "not recommended". That's the only clue you get.
Ghighi
March 2008