1 year old Goodman GMH81155CN Gas Furnace problem

Discussion in 'HVAC' started by bcarter, Oct 18, 2010.

  1. Oct 18, 2010 #1




    New Member

    Oct 18, 2010
    Likes Received:
    I have a
    Goodman GMH81155CN Gas Furnace

    115,000 BTU Furnace, 80% Efficiency, 2-Stage Burner, 2,000 CFM Multi-Speed Blower, Upflow/Horizontal Flow Application

    as of last night these have been the symptoms:

    1 click
    2 click
    3 click - RED LED at the bottom motor circuit board comes on
    4 click - RED LED is still on
    5 click - sounds like a double click and exhaust motor comes on the RED LED is still on, but after 2 - 3 seconds the exhaust motor cuts off, RED LED turns off, and the cycle repeats after about 2-3 seconds.

    The unit is less than two years old, no wires are loose anywhere, everything looks clean and dandy on a visual inspection.

    I pulled the fault codes and got these two codes:
    3 - pressure switch stuck open
    4 - open high limit

    according to this site I checked the high limit switch, i get continuity.
    IHateMyFurnace.Com we'll help you get along with your furnace. - and according this site its working just fine.

    The pressure switch i did a visual check and everything looks ok.

    Please assist

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