Question about Goodman GMS90703BXA Heater

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Flame backlash hey just a quick question i have a goodman pgb042100-1 i have had some trouble with the little trip switch where the burner and the ignigtor are located so i straight wired it bypassing the trip switch but now when the burners light they run fine at inital turn on they run then turn off about a min to 2 mins later they go to relight and the flame backlashes around the top protecter plate and catches the wires like the gas doesnt stop running in the burner cut off im stuck and have no ideas any help would be great

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  • johnsstart Jan 08, 2008

    it was actually the heat exchange having multipule cracks behind the burners i had to take the top off to inspect but thanks for all help and hope this does someone good in future



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The burners have an adjustable vent in the front that may have been moved. Also the vent pipe may be inadequate, that is why the roll out switch that you by-passed tripped. If you replace the switch that was by-passed I bet the over flaming stops,as the gas will quit overflowing. Most of these switches have a little reset button on them so look at it next time before you by-pass the wires.

Posted on Jan 07, 2008

  • Rob Luna
    Rob Luna Jan 08, 2008

    That's why the roll out switch was tripped. when you by-passed it, there was no longer any protection from gas overflowing the burners. If the burners were bad there probably was yellow/orange flame from them as well, instead of blue. Thanks for the rank.



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Check the roll out switch it is located right in front of the burner assembly it will have two wires on it some times they are resat-able if you have to reset it do so and then put on the heat to see if flames are coming back out to trip the roll out sensor. make sure the heat exchange and burners are clean.

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Unfortunately that means there's a hole in the heat exchanger, particularly in that cell of it. When the main blower comes on the air is pushed into the heat exchanger, causing the flame rollout. A heat exchanger crack or blowout is usually what condemns a furnace for good. Goodmans however, have a lifetime warranty on their heat exchangers, so you'll probably be able to find someone to replace it pretty cheap, or do it yourself for free.

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1 Answer

My circuirt board has a rapid flashigh trouble light, and the blower does not shut off. What seems to be the problem?

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1 Answer

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Hello Try looking for a tiny TAN colored (button) near the front of the burner rack.It will have a wire in & out of it.In the middle there is a small tab/button.Push that in you will hear a click.That is the rollout switch.Check the vent/exaust pipe for blockage/draft to determine the cause of the switch tripping.The switch is a SAFTEY and repeated trips means there is a problem.

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2 Answers

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Sincerely, Shastalaker7

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1 Answer

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1 Answer

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