Question about Goodman GDS80904BNA Open Flame Heater

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Goodman gmp125-5 Blows constantly but no heat. No flame. Just blows.

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  • Joseph Lillie
    Joseph Lillie May 11, 2010

    Does your hot surface ignitor glow upon start up.

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You probably already figured this out, however, more then likely it is the circuit board. It cost aprox $91 (taxes not included) its relativly simple to replace. I had the same issue and that did it for me. Make sure you mark all your connections before removing them and maybe even take a few pictures in case. Good luck!

Posted on Dec 12, 2008

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There is a Primary High Limit Switch towards the middle of the furnace, it more than likely needs to be replaced, very common to go out only after a few seasons. Also, you could have a flam rollout switch tripped that will signal the same code, these switches are re-settable and are located on the outer top and sides of the burner assembly, they’re about ½ inch in diameter with a red push button in the center and two wires “ usually purple” coming off of them. If either of these are tripped or bad, the blower will stay on indefinitely.

Hope this helps

Posted on Dec 02, 2008

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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.

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