As you can see from the picture, the wire mesh screen is not flat. If you put it in the City Water Connection the wrong way, screen protruding into connection, it will open the reverse flow valve inside. You must put this wire mesh screen in with the screen protruding out towards you.
The water inlet elbow i had connected became frozen. When I took it off this screen was frozen to the elbow and came out when I removed it. I thawed out the screen and didn't realize that it had to go back in a certain way.
It occurred to me last night that maybe the screen had something to do with my problem. Went out and checked, and sure enough it was in there the wrong way.
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