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  1. #1
    Join Date
    Sep 2005
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    I hear a lot of people talking about negative pressure causing problems with furnaces not running correctly.
    How can u tell if a house has negative pressure on it.

    I also read on a prior post that is could make a limit pop on inducer motor. How is that possible.

  2. #2
    Join Date
    Apr 2004
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    I assume your talking about 80+ furnaces. They are really natural draft, the vent pipe should be negative. if the home is negative, it can prevent the flue from venting properly and trip the over temp switches.

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