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I have a Coleman furnace in my mobile home, P/N DGAH077BBSB, which was installed April 2007. The pressure switch died in March 2010 and I replaced the pressure switch in April 2010 with P/N 9371DO-HS-0031, which is a 0.18 aperture switch (replaced the 0.15 switch in there previously) but did not use the furnace at all after replacement as the weather was warm by then. Fast forward to October 2010, I changed the filters and turned up the thermostat for the first time this season and it only blows cold air. There are no error codes. Appears to operate normally. Just does not blow anything but cold air. Help!

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  • kc2rib Oct 04, 2010

    read this: [url=http://www.ehow.com/how-does_5045697_tro...[/url]
    it says two things may be occurring; either the blower drive belt or a dirty burner which needs cleaned. I would advise that it is a dirty burner as you have not used the furnace in several months. Call a pro.

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Hello Maybe the switch is doing it's job.Please inspect the entire exaust/smoke pipe/chimney system for blockage or restrictions/nests.

Posted on Oct 04, 2010

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