Question about Goodman GMS90703BXA Heater

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Furnace starts properly, then shuts down, led flashes 8 times

Goodman GMH95 natural gas furnace appears as though the integrated curcuit board is not detecting the flame, and is shutting off the gas valve at the same moment the circulator fan starts. I suspect the timing is the same because both are set to occur 30 seconds after startup. Unit will cycle again of it's own accord, but never burns over 30 seconds. Any ideas?

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  • Anonymous Mar 15, 2014

    in morning house cold check oil furnace beckett oil burner model nx in lockout mode green led flashing hold reset button in for 50 sec led flashes once and furnace tries to start but does not detect a flame and locks out again repeating this cycle flame led never comes on

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The first thing to look at is the flame sense rod.
Shut off power to the furnace, remove, clean sensor with steel wool or sandpaper then reinstall the sensor. Reapply power and it should run properly.

Posted on Jan 10, 2009

  • Denis Delgadillo
    Denis Delgadillo Jan 18, 2013

    it work! thanks so much, I order a board thinking it was the board. Now I will have a board standing by. thanks a million its 25f and dropping

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1
1 FLASH
Furnace fails to operate.
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• Check flame sense
signal. Sand sensor if
coated and/or oxidized.
• Check flue piping for
blockage, proper
length, elbows, and
termination.
• Verify proper induced
draft blower performance.

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