we purchased a home a few months ago and now that winter rolled around, just realized the radiators in the basement aren't working. And I apologize for the long post, tried to explain everything I've discovered. Luckily most of the pipes arent hidden behind walls in the basement so I could track the route.
The pipe that goes to the basement radiators in that pic gets cold about fifteen feet later. There's no branches or valves or anything, it seems like its just a straight shot in that pipe and gets cold. Don't know whether its blocked somewhere or something? And maybe it gets cold just because its not moving?
Then it gets to the first of two basement radiators, pictured here. It doesn't appear to have a valve before it (like I see in most youtube videos). I do notice that maybe there's too much extra paint on it, maybe blocking the little steam blow off thing? But I have no idea if that's the problem.
I was curious if that zone valve pictured (like the one in this youtube video) was somehow shut and blocking everything. Based on that video I don't think it is (think it would get hot there if it was?), but I also slid the little switch to "open" instead of "automatic" just in case to check, and didn't notice a difference.
Any ideas of what to check next?
Update for anyone checking now
It was definitely the zone valves as suggested. Yesterday switching it to manual didn't do anything, but I suspected that as the system goes in cycles, it may not have been "pulling" anything with the circulating pump at the moment. So today I switched the zone valve to manually open again and cranked the heat wayyy up. All of a sudden both downstairs radiators got hot. So now the question is just WHY the zone valve didn't work. Time to figure that out.