I have a GE dishwasher (GE GSD5940D00SS) that does not drain correctly.
There is a ton of info available on the web to help diagnose the issue
and I have tried just about everything to find the cause. I have
checked all the hoses/air gap for blockage and there is none. I also
know the drain hose is clear because the dishwasher drains correctly
when the auxilary pump is running. I have also replaced the check
valve/plunger. The primary pump and impellor seem to be okay (have
inspected both and there seems to be good pressure in wash mode).
Finally, the drain solenoid is operating at the appropriate time.
What I am suspecting the issue is is related to the following comment I
saw in another post:
"How this unit works is...the timer send voltage to the drain solenoid
for a short period of time, then disconnects the power. The water
pressure that is created by the pump is what **
the drain valve
open, until the water pressure/volume is low enough for the drain valve
spring to overcome and the valve closes."
When draining with the primary pump, I do see the solenoid engage
fully, but don't see the water pressure force the drain valve fully
open. If I force the drain valve fully open, it does stay open long
enough to drain the dishwasher. Any ideas?