Guys - sorry for the long winded post, but this thing has me pulling my hair out
About 2 months ago the DW stopped filling - it would go through the whole cycle without running any water into the tank.
I discovered that if I pour about a gallon of water into the bottom of the tank, the DW uses that water for the pre-rinse, drains it, then the valve opens and the DW works normally. The problem was intermittent - maybe 1 out of every 5-10 wash cycles it would fail, I would pour in water and it would be fine for a while. I figured one of the water level switches was going bad but did not have a wiring diagram or time to look at it when it was failing.
About 1 month ago I found a wiring diagram and sat down with an ohm meter to troubleshoot what component was causing the failure. To my surprise, the water level switches all checked OK. What I did find was that the coil on the valve was open.
So I ordered a replacement water valve, installed it and everything has been working until today. Today it did not fill and I checked everything with the meter and the new valve's coil was open. So I poured water in the tank, started the cycle and sure enough, it all worked. Now the water valve coil reads about 1k ohms.
What is the likelyhood that I got a bad replacement water valve? ( I can see this is possible but unlikely)
More puzzling - what would cause the valve to start working just because I poured water into the tank? (I have no explanation for why this works.)
At this point, I am at a loss as to what could be the real failure. Any suggestions greatly appreciated.