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Posted by HeatPro on January 11, 2009 at 17:09:36:
In Reply to: Banging noiser in boiler posted by Jeff on January 11, 2009 at 09:00:44:
Yes. Air trapped in vertical pipe makes a second expansion tank that messes up pressures for the circulator and air will always leave and come back to an air trap. Loosen the cap to let air out slowly, them tighten it again.