Question about Coleman 7990-319p Evcon Gas Furnace Control Board

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Indicator blicks 3 times replaced combustion air switch but did not resolve problem. what do i do now?

Air combustion switch was replaced but didn't solve issue indicator light still flashes three times

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There should be a diagnostic chart on the furnace door by the wiring schematic. If so see what the code reads for three blinks.
By the term "air combustion switch" I guess you are referring to the pressure switch. Most diagnostics blinking three times is just a dirty flame sensor. If this is the case the burners will light and go out within 4 seconds. If this is the problem carefully remove the flame sensor and clean gently with emery cloth, fine sandpaper or fine steel wool. Reinsert the sensor and enjoy your heat.

Posted on Dec 19, 2014

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Posted on Jan 02, 2017

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