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Varivalve vents/steam radiators
Okay, I'm in need of some real help and am not afraid to admit I'm clueless!
I've got steam heat with radiators. Each of the radiators has a HeatTimer VariValve on it. Usually the house is comfortable. Recently I've noticed that two radiators are staying cold. If I take the varivalve off, shake water out and put it back, the radiator will heat up. I think I remember hearing that these valves should not collect water? (Its only a little bit that comes out). But this seems to be only a quick fix because the radiators usually wind up cold again within a day.
I'm not even sure how these valves work or what they're there for. The only option they have is to be open, closed, or somewhere inbetween.
Can anyone give me a quick lesson, and maybe suggest why those radiators are staying cold and what I should really be doing to help them?