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  1. #14
    Join Date
    Jul 2009
    Columbia, MD
    pull the flue pipe off and try it from a dead stop and then while its running. check the runners and make sure they are clean.

    check the manifold. there could be lots of spiderwebs in it.

  2. #15
    Join Date
    Jan 2015
    Bellevue, Washington, United States
    Sounds like a cracked heat exchanger.

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