How to fix program fault with hotpoint dwf32 dishwasher?

The dishwasher programs do not operate properly. Selecting any of the wash programs immediately displays a 2h time delay (without it being selected), although the wash starts straight away and does not stop. It doesn't heat the water very much either. The only exception is by selecting the quick wash or pre wash program, which shows no time delay but displays a very long wash duration eg 80 mins.
The control module was faulty, but this was repaired by a specialist repairer and they have checked it again and it tests ok on their test rig, but has not made a difference to the operation.

Any ideas anyone?

Thanks.