Question about Goodman GMS80903BNA Heater

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Furnace short cycles

I had a new 80% 70,000 BTU heater installed. During start up, the burner would light and burn for 40 seconds. The flame would go out, the cycle would complete itself, and no blinks on the red indicator light (LED) on the circuit board. The book says that I either have a 115 volt, or 24-volt VDC problem, which we don't have, or the circuit board is bad. Is this a common problem or should I be looking for something else? Thank you. Ted

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Turn electric off to heater, there should be a light switch on the side of the heater that cuts electric off to the heater. find the flame sensor, unplug wire to it and remove from heater being careful not to touch it with your hands or fingers, because of the oils in our skin. you can touch the part that the wire plugs to. when you get it out take fine emery cloth and clean the probe side or the sensor side real good and reinstall it. plug the wire back in and try heater. it should work fine. the sensors sole purpose is to detect flame and when it gets dirty with carbon it cant. so the sensor false reads and tells the heater its shooting raw gas into the heater and the heater shuts down, or short cycles, its there incase the ignighter fails. hope this helps you. it cost me 105.00 for this info. write it down in your owners manual so you dont forget it. the symptoms and the cure.

Posted on Jan 27, 2009

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