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Heater won't light

The induced draft motor runs for a half second, then quits. No HSI glow or gas flow. LED on the circuit board blinks rapidly and continuously. According to the error codes on the inside of the panel, that indicates a "incorrect twinning" or "incorrect polarity".
the solution given is to reverse the transformer secondary wires or the primary wires. I have done both with no change in the operation of the heater.

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  • fstephens Oct 19, 2007

    Thanks so much for the response.
    I thought I put the make & model in the original message form, but somehow it was lost when I posted it. The heater is a Goodman MN:GMP075-3.

    The inducer motor turns very freely, and the resistance through its coils is almost nothing. The pressure switch also seems to be working fine (and I bypassed it to test once too). The HSI appears fine and has a resistance of about 75 ohms.

    The fan will run if I connect the green and red thermostat wires, but the error code still flashes. Nothing happens when I connect the red and white thermostat wires. The inducer motor only runs for the half second when I put power to the furnace with the red & white thermo wires connected. Reconnecting them with power on does not cause the inducer motor to turn.

    Any help greatly appreciated (as well as sources for wiring diagrams, troubleshooting info or parts).

  • fstephens Oct 20, 2007

    Yes I am talking about the same blower motor. I did as you suggested and I hear a relay on the circuit board click, the voltage goes to 110 momentairily and the drops to zero again. So I guess it is the board? That was the conclusion I was leaning towards, but I wanted to be sure before I order one.

    There are also 2 ground wires I cannot account for. One is a short green one that has no apparent place on the board or anywhere else to connect it to. It has a terminal end that supports connection of a second spade connector. The other wire is a long blue one. Both are connected to the chassis near the upper left of the circuit board. I see on the wiring diagram that there is supposed to be a ground hooked to one of the transformer's secondary connections, along with 2 blue wires. I wonder if this long blue one should go there too? Seems strange to me, but since the error code mentions the secondary wiring... There is no connector on the end of this long blue wire, so I don't know if someone previously cut the end off or what. I did try connecting it as the diagram shows, but that did not change anything.

    Do you know a good source for the circuit board?
    It is B18099-13.
    This site lists it:

    Thanks for your help. Any sources for troubleshooting info or diagrams welcome too.

  • fstephens Oct 20, 2007

    Thanks allot for your help.
    Really appreciated.

  • JPScott Feb 24, 2008

    Good Morning:

    I am having a heating problem as well. I had furnance maintenance completed on my unit and had the thermastat upgraded and replaced. The problem is the vents on the first floor of my home. Heat is not blowing uniformy out of the vents.. So that level is always cold. The bedrooms are almost hot because all the heat is blowing out of those vents but on the first floor heat only blows through one out of the four vents on that floor. Any ideas on what could be causing this? Thanks so much for your help.

  • Anonymous Dec 20, 2008

    heater wont ignite every thing turns on but no light



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Not having a make or model number, I can only give you generic information. However if you add more info, others and myself can give you a better diagnosis.


In order for a furnace to start that has an inducer motor, the thermostat must call for heat. Then the circuit board will flash rapidly. There should be power from the board up to the inducer motor. If there is too much resistance, the blower motor or pressure switch(s) will shut down the unit. I would suggest that if you can spin the inducer motor by hand, check for resistance. It may be frozen up or there may be water in the housing not allowing the blower to turn. Check for a plugged water drain at the bottom of the blower housing and make sure it drains. If the inducer blower does not even try to start, you will need to check for voltage from the circuit board. Not knowing for what you have for a model, I am unable to tell you if you should be checking for AC or DC voltage.


Get back to us as soon as you can with more info.


Thank you for your patience.

Posted on Oct 19, 2007

  • Chandler Ede
    Chandler Ede Oct 19, 2007

    I fear you have an issue with either the inducer blower motor or the control board. For some reason the relay is dropping out on the inducer circuit and then te unit just will not operate. You will need to hook up a meter to the 2 wires from the control board going to the inducer motor. Put your meter on AC voltage of about 200. Watch the meter, see if the voltage stays or drops out. If it stays at about 110, you have a bad inducer blower motor. If it drops out, bad board. Just to make sure we are talking about the same blower motor, the inducer motor is connected to the exhaust vent pipe and is not the blower in the bottom of the furnace cabinet.


    I hope this helps.

  • Chandler Ede
    Chandler Ede Oct 20, 2007

    There are a number of places on the web to order one. As far as the green and blue wires, The green one should be attached to chassis ground. I am not sure what the blue wire is for. Chack it for voltage when you get your new board. It may not be used, your wiring diagram may help.


    Good luck to you.



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Read one LED flash that stays on continuously to mean your furnace has no signal coming from the thermostat and will not operate. Turn the power off and check the thermostat for improper settings or connections.

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