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Heater not staying lit - Goodman Heating & Cooling

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  • rdallen Dec 01, 2008

    Goodman Model # GMH950703BXAA Ser. # 0612626994 Gas type = LP Two years old.



    Unit operated flawlessly for two seasons. This season it started acting up as follows:

    Thermostat calls for heat----Exhaust fan starts running-----Ignitor comes on----Burners light-----Blower fan comes on-----After about one minute the flames go out-----both fans continue to run------Ignitor activates------Burners light and burn for another minute to ninety seconds, then go out again. This cycle continues until thermostat reaches set temp. Status (red) LED stays solid on indicating normal operation. I replaced the thermostat and the unit ran normal for several days before starting the intermittant lighting again. I have a multimeter and can replace parts in this type appliance.

  • rdallen Dec 01, 2008

    12/01 Flame sensor was removed and cleaned with fine emory cloth. No change. Where do i check the flame sense signal?

  • rdallen Dec 04, 2008

    This info was helpful in finding where to start. The furnace now extinguishes and re-ignites several times while bringing the room temp. up to thermostat request. I'll install a replacement flame sensor this weekend and proceed from there. Something is telling the gas valve to close and i need to find out what it is.

  • Joseph Lillie
    Joseph Lillie May 11, 2010

    Hello and welcome to FixYa.
    Can I have the full model number, serial number, type of gas?
    What exactly is the unit doing?
    Do you have skills to work on this type of appliance?
    Do you have a electrical meter?


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  • 61 Answers

This from the installation manual on your furnace.
I think you need check the flame senor for proper output. if the output is correct you wil have to switch the electronic board.

FLAME SENSOR (QUALIFIED SERVICER ONLY)
Under some conditions, the fuel or air supply can create a nearly
invisible coating on the flame sensor. This coating acts as an
insulator causing a drop in the flame sense signal. If the flame
sense signal drops too low the furnace will not sense flame and
will lock out. The flame sensor should be carefully cleaned by a
qualified servicer using emery cloth or steel wool. Following cleaning,
the flame sense signal should be 1 to 6 microamps at 115
volts.
Post me back and let me know.

Posted on Dec 01, 2008

  • Joseph Lillie
    Joseph Lillie Dec 01, 2008

    You disconnect wire and test through your meter. Your meter will need to read microamps.

  • Joseph Lillie
    Joseph Lillie Dec 04, 2008

    most likely the the board that sensor goes to

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