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Posted by boconnell on March 01, 2005 at 19:02:46:
i have a munchkin 140m supplying 4 zones (hydronic air and baseboards). on numerous occassions, the boiler beigns to make a very loud, almost, banging noise. almost like you would hear with air in the pipes. the rumbling gets very loud and lasts for 30-60 seconds before disappearing. we have bled the system of air. i am not sure where to check next. any thoughts? thank you.