Chattering though oventrop - fixed

I must not make assumptions.

I could not figure out your piping in the photo.



Because I know the connections to Taco and Lawler mixing valves and, based on that, you had the mixing valve hooked up incorrectly. I just assumed all mixing valves were the same. But since you are a professional and would probably not make a mistake like that, I suspected that my assumption was incorrect, as indeed it was. The Oventrop valve is piped differently.