I replaced an old boiler with a new mod-con and now 2 of the radiators do not heat up. All were bled of air of course. I could even feel heat entering one while bleeding water out, but it did not continue to heat up on its own. I am not the installer, just homeowner. I think the installer was stymied. The water flows in a black iron loop in basement with a narrow neck piece right around each outlet and return for each individual radiator. Water was drained, flushed and a magnetic filter placed in line. Make sense? Any suggestions would be appreciated. Thanks
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