Cold pipe in hot water heating system

Dave_4

Any chance you could sketch out a schematic? How about some telling photos? Maybe 600 pixels wide?

Checks might be called for, but without fully grasping zones, zone-valves, returns, etc. My head's exploding from the what ifs...

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Andrew_17

Cold Pipe in hot water heating system

I live in a small row house with a hot water radiator system. Some piping was reworked by a past contractor and now one of the baseboards is cold. the system has been drained and bled twice to no effect. The radiator worked fine before the pipes were reworked. I don't want this contractor back in my house again, so they are not an option.

I checked the feed pipes for the system and found that it branches off to three different lines. Two serve the upstairs and one serves the downstairs radiator with the problem. When the system was filled, I checked the pipes for temperature. The two upstairs lines were hot and the other was cold. The lines that serve the upstairs are both 1.25" copper pipes and the downstairs line is 1" copper.

The flow is as follows. The first 1.25" T shoots off to the right and a few inches later the 1" T connects off to the left. Following that, the 1.25" feed pipe goes straight into a 90 degree elbow that continues to the third line upstairs. A contractor friend, who is now overseas, suggested that I might need a check valve. I don't know if this will solve the problem, but if it will, I need to know where it would go in the flow process described above. I am comfortable with pipe-work, so I plan to resolve this myself.