Question about Goodman GMS90703BXA Heater

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Furnace gas valve wont open (roll out switch failure)

My GMP075-3 will start and fire for about 1-2 minuites then the gas valve will close and the unit will not restart. When I test voltage accross the valve and it read 0. So I powered down the furnace reset all 4 roll out switches, turned the power back on and the gas valve opened and the furnace fired up. Again within 1-2 minuites the gas valve closed. I also disconnected all but one of the roll out switches and bypassed the rest and the same problem occured. I tried this with each of the 3 switches directly connected to the combustion box and every time it failed. Therefore I believe I am overheating the combustion box and tripping the roll out switches. Any ideas for the over heating?


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  • 3 more comments 
  • bbaiotto69 Dec 04, 2008

    It blinks once, Flame falure.

    Also note that the combustion fan and supply fan seem to operate correctly.


  • bbaiotto69 Dec 05, 2008

    I know it is failing to an overheating combustion box. The gas valve closes when one of the (4) the roll out switches trips due to high temperature in the combustion chamber. When I reset the switches the furnce will fire but only to trip one of the sensors again. I have also replaced the filter and cleaned the very dirty blower and it still fails. However it still seems like the blower is not blowing very much air (I just bought the home so I do not kow what the proper operation should be). Could it be overheating due to a bad blower or blower motor.

  • bbaiotto69 Dec 05, 2008

    Not when it happens but if I try to restart with out resetting the roll out switches it will blink once, flame failure

  • bbaiotto69 Dec 08, 2008

    I think the cracked heat exchanger is the answer. When the blower turns on the flame will roll back into the combustion chamber and also has orange tipped flames.

  • Chandler Ede
    Chandler Ede May 11, 2010

    Is the control blinking an error code when this happens?


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Sequence of operation, Gas Furnace.

On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the ignitor. The ignitor will glow and you will be able to see it if viewed thru the small inspection port. Once the ignitor gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the ignitor does not energize (bad control, bad ignitor), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not lite (dirty pilot), the burner does not lite (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).

Most newer furnaces will have a diagnostic center or control built into the control module. You may be able to view it as it is running thru a small viewing port. Some models will require the removal of an access panel prior to finding it. On the reverse of the access panel, there will be a diagnostic chart that will aide you in understanding any error code recorded (usually a blinking light).

This is why we technicians earn the big bucks!

Posted on Dec 04, 2008

  • 1 more comment 
  • Chandler Ede
    Chandler Ede Dec 05, 2008

    your one blink indicates that the furnace is trying to ignite for a number of times without success. Follow the sequence of operation I sent you yesterday to help diagnose where it is failing.

  • Chandler Ede
    Chandler Ede Dec 05, 2008

    Yes, the blower motor may not be reaching a speed to push out the hot air. Does it make a difference if you run the system with the blower door open? Your blower has 4 speeds. Check to see what color wire is connected to the Heat terminal on the control board. If you have the red wire connected, change places with either the Orange (med-low) wire or the Red (Med) wire.

    Another thing to look at is if all the return air dampers and supply registers and dampers if you have them are open. A restriction in air flow over the heat exchanger will cause this condition.

    Go here for an operation manual for your furnace.

  • Chandler Ede
    Chandler Ede Dec 05, 2008

    One other possibility, cracked heat exchanger causing the room air blower to blow into the combustion chamber and force heat toward the spill switch. May be a good idea to look closely at the heat exchanger.


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