Posted by jtown on January 01, 2000 at 18:57:56:
In Reply to: Cold radiator posted by dennis p on January 01, 2000 at 18:17:14:
You say you had no success bleeding. I take it you have forced hot water heat with key type air bleeders at the top of your radiators. If you didn't get air out to the point of getting water. If not you have no pressure there. Try others that are just as high vertically when the boiler is up and running. If they squirt well, your system pressure is probably high enough. Remove bleeder screw all the way and poke a wire in to make sure it is clear. You might have paint in the outlet to scrape off. Don't lose the screw. Check that other radiators are off the same supply and return and are working with no valves between the two. If you have heat there and pressure at those others at same level, I'd suspect the radiator valve disk might have worn off the stem and is closed. Check the feel of that valve opening and closing compared to another. Drain down to that valve and pull the bonnet to check. If the radiator is on it's own zone, it could be a host of things, zone valve stuck shut, pump coupling etc.
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