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Goodman GMS81405DNA. 3 Blinks indicate a Pressure Switch Problem. Usually water in the hose, but not this time! When I remove the hose, and draw air through it myself, the furnace fires. The Recirc Motor feels like it's BLOWING air out, and not drawing it in! Any ideas? Mark

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  • mrfyvie Nov 30, 2008

    Did not appear to be, and the vent blower rotates freely with abundant speed.

  • mrfyvie Nov 30, 2008

    Will check my Exhaust Flew tomorrow. For now I'll sign off untill then. Thanks so much for getting back to me, and I'll do the same later, Mark

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  • 182 Answers

Id say your flue exhaust pipe is restricted.

Posted on Nov 30, 2008

  • Dave Dobransky Nov 30, 2008

    If the fan is spinning and the pressure switch is ok....its either flue or heat exchanger with a big hole.

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