Have an older, but very functional dishwasher (almost). Ckt diagram looks
very simple, but behavior of the machine is puzzling. It has a motorized
cam switch controller.
Problem: It does not fill with water at the start of the cycle. If I turn
the dial past Light Wash, it does fill. Obviously there are several times
that machine fills with water during the full cycle.
Tested the inlet valve and float switch - both are fine and I can apply
110AC direct to valve to prove it works. I do not find 110V on the solenoid
or float switch, so the problem must be upstream in the controller, but
there's only one contact involved, which works in other stages.
From diagram it looks there are only two things in series with the solenoid
valve: cam switch contact and float switch.
Since the cam switch operates in other stages of the cycle, it too must be
good. So I'm puzzled why it will not operate at the very start of the
cycle. Looked at the plastic cams and do not see any parts missing.
Has anyone seen this strange behavior?