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Hello. I have a Burnham SIN5LNC-LE2 installed in 2008. I am having a problem where the nearest lines and rads to the furnace work fine, but the 3 furthest are ice cold. I've changed the air vents and also tried removing them for a while to see if that helped but no luck. I also changed a main vent with a Hoffman 75 but that made no difference. I've drained the boiler last month and it seems to be firing and the flames look good. I've also tried to pitch the cold rads a few degrees. Is there anything else I should be checking? I have some pics posted here if that helps:https://drive.google.com/folderview?id=0ByRFtxzM6VpQTEJGRHBMdmxNS3M&usp=sharing
Thanks in advance