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No heat to one room, single zone
I have searched here and elsewhere on this and have tried everything...
One room the radiator will not heat, the only way it heats is if I run the system for an hour and every room is cooking. And even then I have to remove the vent entirely.
I have done the following:
The radiator is pitched as best as can be, one side is up on shims.
Changed out to a new vent, biggest / fastest
This weekend I opened the top of the shutoff valve to see if the valve was broken and the seal was closed; the valve is not broken And there is no visible sludge in the valve or the riser that I can see.
All the other rads on that side of the house heat fine.
I did not yet hookup a bike pump, but I can blow through the radiator.
The only thing that I can think is that when we did a renovation 13 years ago, the riser was moved into an exterior wall, and I don’t think they insulated properly, they may have used rubber not fiberglass.
Is there any kind of powered vent that sucks the steam up to the radiator? I think the steam condenses in the wall, and the rad only gets hot when it runs long enough to heat the exterior pipe.