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    Fikret's Avatar
    Fikret Posts: 5, Reputation: 1
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    #1

    Oct 12, 2010, 12:43 PM
    Goodman control board not sending power to ignitor?
    I have brand new goodman furnace, AC part works fine, but when I turn it on heat the draft inducer motor never starts. I checked there is no power coming to it from the control board.
    mygirlsdad77's Avatar
    mygirlsdad77 Posts: 5,713, Reputation: 339
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    #2

    Oct 12, 2010, 04:06 PM

    Jump r and w on the control board and let me know what happens. Make sure the blower compartment safety switch is pushed in while running this test, otherwise you will not have power to the control board.
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    #3

    Oct 12, 2010, 05:17 PM
    Comment on mygirlsdad77's post
    After I jump r and w the red light flashes 3 times, indicating pressure switch failure. But the draft inducer fan never starts so I am thinking its not pressure switch problem.
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    mygirlsdad77 Posts: 5,713, Reputation: 339
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    #4

    Oct 12, 2010, 05:23 PM

    If a pressure switch is stuck closed, it will not allow the draft induce to start. Try disconnecting both wires from both pressure switches and let me know what happens.. If this is a brand new furnace, I really think you need to have the installer back to trouble shoot the furance. Doing work on the furnace yourself will void warranty. If you installed the furnace yourself, then warranty is already void, in which case I will try to help as best I can.
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    #5

    Oct 12, 2010, 05:32 PM
    Comment on mygirlsdad77's post
    I thought there was only one pressure switch, This is a GMS8 Single stage furnace, I Tried disconnecting wires from one pressure switch no change, blower did not start.
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    mygirlsdad77 Posts: 5,713, Reputation: 339
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    #6

    Oct 12, 2010, 05:49 PM

    Sorry, your correct. Only one ps on your unit. Now, bear with me here. There are anywhere from one to three flame rollout switches on you unit Located directly above the burner assembly. They are small switches with a small button in between two wire connections. Press on the small button and if you feel or hear a small click, then the limit was tripped and the click reset it. One step at a time here, as its hard for me to diagnose without having my hands on the unit.
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    #7

    Oct 12, 2010, 05:59 PM
    Comment on mygirlsdad77's post
    I will try the rollout switches first thing tomorrow. This furnace is in the rental unit so I can work on it only during day hours. Do you have any suggestions on what else to try if its not the rollout switch.
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    #8

    Oct 17, 2010, 09:18 PM
    I finally got this furnace to work. What happened was that some water got to the control board and made it malfunction. Had to replace whole board ($60 at local goodman distributor), and a pressure switch which was also bad ($14)
    mygirlsdad77's Avatar
    mygirlsdad77 Posts: 5,713, Reputation: 339
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    #9

    Oct 18, 2010, 04:09 PM

    Glad you got it fixed, and thanks for the update.
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