A GE Convertible Dishwasher - essentially a portable that's been set up as semi-permanent by having permanent hoses run to and from the sink - is at least 9 years old. If water is supplied to it, the water will fill the bottom of the tub until it overflows. This seems to happen no matter where the timer is set. It happens whether the washer is plugged in or not, and whether the door is latched or open. I can succesfully pump water out by advancing the timer to the drain cycle.
I suspect the inlet valve as described here:
Any other theories as to what's wrong? Suggestions as to how to proceed?
TIA,
-Scott