Have a 4-5 year-old Weil-McLain Gold with Carlin burner. Has worked great since installation. Had yearly tune up done a week or two ago, and now get this loud rattling from the draft damper on the chimney connector when the boiler runs. Makes a racket when cold, but settles down once it gets warmed up. Burner guy tells me it is a draft problem in the chimney, but could not explain to me why it has started all of a sudden. Chimney is clean and tight, nothing seems any different that it has ever been, but it has never done this before. Damper rattles back and forth like crazy - is it supposed to do this? Need a new one? Something to do with burner, etc? Why would it have just started doing this?
Thanks for help!!