We have a late 1960's Kitchenaid Superba (by Hobart) dishwasher.
Problem: the drain operates continuously, so the dishwasher can never fill with water. (The water comes in, but it's immediately pumped out.)
Never had this problem until I tried one of the cycles that I don't regularly use. As soon as I pushed the button to start it, the problem appeared. Makes me suspect something went wrong in the control unit.
Is there an easy way to tell whether the issue is with the control/timer unit (maybe an electrical issue is keeping the drain gate open?) versus a problem with the drain solenoid/gate itself?
Replacement parts aren't cheap, so I'm hoping to narrow down the problem.