aqua hot
2013 Diplomat. I have heat on zone 4, but only blows cold air in the other 3 zones. Any ideas why?
Forum Discussion
Usually the check valves for those cold zones are stuck shut. The easiest way is to whack them gently with a hammer to free them up. very common problem on Hydronic systems that are not cycled regularly on heat. You should cycle the heat zones at least once a month for a few minutes to prevent this from happening. Doug
