well here goes. I filled my lines this mourning and bled most of the air off[as much as i could] it is a 2 zone system in a garage. The one zone is flowing great, the other , nothing. I took the lines off the manifold and tried to blow air through it-- nothing. Now what do i do. Was hoping maybe the line was froze, but i cant see why it would have had any water in it. I'm guessing a kinked line.
I am not an expert in Hydronic systems, but I know some guys who are, and may be able to tell you how to locate the problem. Undoubtedly, you will have to demo some floor to make a repair, but maybe not.
Call Watts Radiant at 800-276-2419 and ask for hydronic tech help!