Lol I swear it's that cold valve on #9 is causing the problem the water heater fills from the main line the cold should only be open when it's in bypass otherwise it will bleed cold into the hot line in normal use! I hope this makes sense! I have seen and done it myself when I first got my coach but my profession helped me figure it out. It can be confusing it is funny that I just went and read my decal and it does read slightly different then tropicals picture. And its interesting that I do not have a valve mentioned by rich. So just trying to help because I do see both of your knowledge for sure and don't want to step on any posts for sure
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