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    usgs2's Avatar
    usgs2 Posts: 2, Reputation: 1
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    #1

    Oct 20, 2008, 04:07 PM
    Goodman furnace won't ignite
    I have a Goodman GMS90904CXA thatwon't ignite. I switched my theromstat to heat and the vent fan came on but it did not ignite, I checked the unit and it was flashing 3 times(with vent fan running) I shut it down and did a startup procedure, same results.vent fan came on but did not light and still flashing 3 times, any help would be appreciated.
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
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    #2

    Oct 20, 2008, 06:18 PM

    Look on the inside of front door/panel it should tell you what the 3 flashes mean
    usgs2's Avatar
    usgs2 Posts: 2, Reputation: 1
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    #3

    Oct 20, 2008, 10:30 PM
    Thanks for the info I found a similar posting that said code 3 indicates a pressure switch.I pulled both tubes to check and found a Spider and nest in the one tube.Once I cleared it out and replaced it if fired right up.Thanks for the info I appreciate it.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #4

    Oct 21, 2008, 03:35 AM
    Glad you got it going
    camrec's Avatar
    camrec Posts: 3, Reputation: 1
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    #5

    Oct 28, 2008, 10:27 PM

    Just found out the expensive way,same thing,fan but no heat and shuts off after a few.turned out to simply be a clogged vacumum line from the fan to the limit switch,clean out the nipple on the fan.cost me $196 to find out,hope this will save $$
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