Question about Goodman GMS90703BXA Heater

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15 year old goodman heater is cycling. heating element glows red and the burners turn on for 20 seconds and then goes out. fan is in the on position . after the first light the element turns red but furnace will not light and heating elemnt goes out

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Sounds like the flame is either not traveling to the flame sensor or the flame sensor is dirty or bad. Look to the far left of the burner box for a probe near a burner. Lightly scrape and debris from the probe. The probe will have only one wire going to it. Do not touch the igniter or it will break.

Posted on Feb 18, 2009

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This sounds like a pressure switch problem... turn off..locate pressure switches...take off connoctions and shake them upside down (this is to get condensation out of them) once you know they are dry replace them turn on and start. It could also be your intake air pipe is cloged or the exhaus air is blocked

Posted on Dec 09, 2008

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The sequence of operation is -

Combustion fan purges the heat exchanger. A pressure switch verifies combustion air fan is running. Usually a 30-45 second purge before the hot surface ignitor glows, or the spark ignition starts.

Gas valve opens after 10-15 seconds and main burners light. Control board monitors for flame and shuts gas valve after 2-3 seconds if main burner does not light.

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