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I just bought a house about 6 months ago and now I'm having an annoying problem with the circulator pump in the heating system. I have a closed water heating system, with a circulator pump next to a gas power boiler.
When the pump starts up there is a really loud rattling sound that you can hear in the whole house. I've turned the pump off with its toggle switch when its making this sound and it stops, so I'm pretty sure its the circulator pump and not something else. I've tried bleeding the air from the system (maybe I didn't do this right) at the air scoop, but only water comes out so I don't think its an air problem. I don't know how old the pump is, but its labeled as an Armstrong SS-30 which is supposed to be self-lubricating. Does anyone have a clue what the problem might be here? Do I need to replace the pump or am I just not bleeding the air properly? Thanks for any advice!