I replaced the door catch and got this problem. Found it was due to a faulty switch in the door catch and swapped it with the one from the old catch.
Might be useful to explain how to get at the switch on the built-in dishwasher:
First take off the front cover panel. To do this you need a magnetised star screwdriver. Undo the two screws recessed into the inside of the door carefully ensuring you keep them attached to the screwdriver. Lift off the front panel.
Now detach only the control panel by unscrewing just the top screws from the inside of the door.
Nigel, January 2010