4uzindian
Member
back again from last 4 months. the tech put the new #15 expansion tank on . it was last Tuesday. said everything was good. he did not purge the system afterwards. now I'm back with a hum in the living room and kitchen. you think it is air in the lines? today is Sunday. last night there some slight banging in the pipe in the living room ?or could it be from the boiler itself ?put ear to pres - temp gauge .hum sounds like its coming from boiler. the outgoing pipe has this to.
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