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I am having issues with loud banging, especially in one bedroom (mine of course). It bangs several times a minute when heating up and then will bang about a half hour after I have turned system down. I have checked to make sure that it is slanted backward so the water drains properly and I have even tried different angles, all to no avail. What can I do to solve this or is there someone in Western Mass that could be recommended to solve these issues.