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Posted on Dec 17, 2009
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Model #GMPN100-4 Goodman furnace. Vent fan

Model #GMPN100-4 Goodman furnace. Vent fan continues to run and does not always allow to recycle so no flame.

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  • Posted on Dec 17, 2009
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The sequence of events for furnace operation is -

Fan purge for 30-45 seconds. During this time, a pressure switch is actuated by the running of the purge fan, proving the control board the purge fan is running.

After purge and purge prove, the hot surface ignition and or spark begins. After a few second delay, the gas valve will open. The control board then monitors for flame prove through another sensor located near the burners. If there is no flame within 3-5 seconds, the gas valve closes. It will repeat this process, usually 3 times, before it shuts the system down, which requires a power down of the system to reset.

I have seen trash get into the hose between the purge blower and the purge switch. But you could be having other problems.

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