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The Check Valve is a Water Source Brand, Unlike most check valves this one does not have an arrow. I completly understand how when the check is installed baclwards AND the recirc valve is open it will form a loop. As I stated above I closed the recirc valve, put all the settings back to to...

In the scenario above if check valve was reversed and recirc valve off the water heater would not have a water suppy. I am sure flow direction is correct, the arrow is on the backside of the connection, I can't get a picture.

Agreed!

Here is a pic of the connections ( recirc valve closed for now) until I figure it out https://drive.google.com/file/d/1mquZ60UKc0St5PJfwdTFtbzbdyEA_VyM/view?usp=drive_link

Bannerman I believe you have found my problem, I have the check valve WRONG. Will post back when installed correctly

Yes to all the questions here’s a pic of the connections. The connections are correct have not been able to post a picture, even a smaller size. Any help on posting pictures appreciated. The Cold water water supply has a tee back to the recirc. port with a check valve above the tee as pictured.

I serviced the unit last year, shows flow from faucet use as I described but nothing when recirc pump is pumping.

I have had the navicirc installed on my 240-A now for a couple years and it never really has worked like it should, for the most part we very rarely have warm or hot water at the kitchen sink. I've tried differant settings in the parameters to no avail, it still does not work right. I'm...