Question about Goodman GMS90703BXA Heater

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My goodman heater is a forced hot air gas heater and it will not fire up. the Glow plug lights up but I can not get a flame.

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This sounds like the gas valve is either not opening, or you do not have gas at the unit. After the hot surface igniter glows, you should here another click a little bit afterwards. This click is the gas valve opening, then blows through the burners. Make sure there is gas to the unit first, and if so, the valve may need to be replaced. You could also have a problem with the control board or even the pressure switch sometimes. Hope this helps or at least points you in the right direction.

Posted on Jul 04, 2011

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Posted on Jan 02, 2017

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Based on your model number this furnace does not have a pilot light,instead it uses a hot surface igniter.typically it glows and when it gets hot enough the gas valve will open and the burners will light.When the igniter starts to go bad it will glow but not get hot enough to open the gas valve.If your furnace lights and the quickly goes out the flame sensor maybe dirty.

Oct 07, 2012 | Goodman GMS90703BXA Heater

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I have a 4 year old Goodman heater model GMS81155CNA that we just replaced the blower motor on, fortunately it was under warranty until April. Now it keeps trying to cycle 2 or 3 times before the burners...


i would start by checking the flame sensor mounted in the same area as the ignitor or glow stick as you called it... the flame sensor is a metal rod mounted in the direct path of the flame once lighted... it senses the flame and sends signal back to control board to keep gas valve opened and continue the operation.... if the flame sensor is dirty or faulty will start to shut system down premature... the pressure switch could be a problem as well but normally if it goes bad it will fail as soon as unit fires and continue to fail due to a bad diaphram in switch... will mimic a bad flame sensor as well unit will fire but will within seconds shut back down.... the ignitor has to be hot enough to light when gas enters chamber and can be weak but if it works sometimes then i would say it is ok....the flame sensor can be pulled and gently cleaned with light grit sand paper dont over due it but clean it up a little and try it... again it is located next to hot surface ignitor( glow stick) usually has quarter inch hex head screw holding it in place... positional to get out but will come out....

Jan 24, 2011 | Goodman GMS90703BXA Heater

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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 igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter 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 igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (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).

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No Heat Goodman GDS80904BNA


If the hot surface ignitor comes on and fires the burners, and then shuts back down, you need to take a look at the flame sensor. It is a ceramic rod with a metal tip that rests in the pilot flame. When heated from burners, it sends a signal to the main control module, circuit board, which ever this unit is equipped with to keep the burners on. It is a safety to shut the burners down if there is a problem. Take some fine steel wool to clean the metal tip on this and this should take care of the problem. If this does not do it, then 99% of the time you have a faulty control board or module. It will have to be replaced.It is where this flame sensor connects.It will continue to drop out of the circuit, and the fan will start and run. You're T-stat is good or the Hot Surface ignitor would not glow. You will need to take as much info you can from the unit, Goodman and the control, all numbers with you.You can purchase this part at a appliance parts house, or air conditioning parts house. Please keep me informed, I would like to hear back from you. I hope this has given you some direction to follow.Good Luck,
Shastalaker7

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When I turn my furnace on, the purge blower starts as normal, then after 15 seconds the ignitor starts to glow but when the gas valve should turn on it only turns on for a split second and then you can...


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 igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter 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 igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (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).

Nov 19, 2009 | Goodman GMS90703BXA Heater

1 Answer

Goodman furnace seems to be cycling too often. Burner not staying on long enough to put warm air into system. Burner quits after a few seconds then repeats.


dIf the burners are only staying on for about 5 seconds, you proably hav e a dirty flame sensor. Watch the burners light, the glow plug will light one end of the burners, in front of the last burner to light the will be a small thin rod, this rod must sense the flame or the gas will be shut down. Take a piece of steel wool and gently cleqan the rod.

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1 Answer

I hope that I can get this problem resolved. Can there be a thread started to help me through this? I will try to keep this as short as possible, I have a Ducane Mod. CMPB050C3A Nat. gas furnace. The...


say that you have the glow bar (Hot surface igniter) working
if the flame starts make sure you don't trash on the orifice of the burner, you can try to use a piece of wire or someting small to pick on the orifice of the burner, also make sure is not rust bewteen the burners gap where the flame spread to all the burners because if the flame sensor don't feel flame don't stay light up
hopes this help

Oct 09, 2009 | Heating & Cooling

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