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    bluemango's Avatar
    bluemango Posts: 1, Reputation: 1
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    #1

    Jan 5, 2007, 05:24 PM
    Noisy furnace
    My furnace makes a banging/popping sound when it starts up and when it shuts off. What causes this?
    NorthernHeat's Avatar
    NorthernHeat Posts: 1,455, Reputation: 132
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    #2

    Jan 7, 2007, 08:28 AM
    Could be the ductwork expanding or a cracked heat exchanger, it is worth having a pro look at it.

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