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Pennco Natural Gas furnace BANGING

dvs138
dvs138 Member Posts: 4
I have an intermitten problem with my boiler banging.  It seems to be when the heat is shutting off.  It creates a really loud bang!  Wondering what this could be? HELP!!

Comments

  • Tim McElwain
    Tim McElwain Member Posts: 4,480
    Is it a mechanical noise

    or is it the gas itself shutting off?
  • dvs138
    dvs138 Member Posts: 4
    furnace banging

    I'm not sure if it is mechanical. It's not happening on a regular basis so it's been tough to catch.  It happened about a day ago and I noticed the heat had just gone off. Not sure if its the burner??  But it's a really loud bang.
  • furnacefigher15
    furnacefigher15 Member Posts: 514
    Metallic bang?

    What can you describe about the bang? metal on metal, etc...
  • dvs138
    dvs138 Member Posts: 4
    furnice banging

    I wouldn't say it sounds like metal on metal.  More like someone kicked the side of it really hard.  It's in the basement and it's a little frightening even when I'm in my bedroom on the second floor.
  • furnacefigher15
    furnacefigher15 Member Posts: 514
    Turn it off

    And, call a professional right away.



    Sounds like this could be a back firing on ignition. Can be potentially dangers.



    Your safety is not worth a few dollars in savings. Please at the very least turn it off.
  • dvs138
    dvs138 Member Posts: 4
    banging

    I had a zone valve replaced in the off season. could the banging be caused by air in the pipes?
  • Tim McElwain
    Tim McElwain Member Posts: 4,480
    What is the

    make of Zone Valve, some valves require a correct direction of flow, in other words it could have been installed backwards. In other cases it could be the CV (GPM flow) rating was ignored and the wrong opening on the valve is installed.
  • furnacefigher15
    furnacefigher15 Member Posts: 514
    Not usually

    Air does not usually cause banging.



    If the valve was put in backwards, I would tend to think it would chatter, or not stay open.



    Do me a favor, and while the boiler is off and shut down by a switch, open the boiler and look for any sign of a burnt wire.



    If you see anything questionable call a professional.



    It's possible you may be hearing a check valve, or a peculiarity with a pump on shutdown, but it's hard to say.
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