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Hey! Thanks for the help. I removed the caps and fully tightened the control spindles to cut off flow completely(picture1) (unsure why the left one stopped much higher than the others?) Then as in manually two turns anti-clockwise(pic 2) however did not see any change in flow meters. I also...

Hi, I’ve inherited this ufh system and having trouble after trouble with it. Had someone out 3 times but still problematic. Flow from gas boiler bottom left, return to boiler top left. Current issue is return pipes are roasting hot and supply is cold/lukewarm. Flow meters all read 0 and are...