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    superlars's Avatar
    superlars Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Dec 14, 2008, 04:50 PM
    Rheem Classic 90 starts burner - then stops.
    I have a Rheem Classic 90 upflow heather. When it turns on the burner comes on fine but it stays on for just 5-10 seconds then shuts off. It does this twice then the blower comes on but with no flame going. The yellow flame sensor LED doesn't come on at any point. I have cleaned the flame sensor with steel wool. But apparently there is no power to the flame sensor. The two red LED's are on.
    Any ideas?
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
    Ultra Member
    		  
    #2

    Dec 14, 2008, 05:09 PM

    Make sure you have a clean circuit to the sensor (not grounded), a solid ground to the burner assembly, and that all the burners are lighting.
    MarkwithaK's Avatar
    MarkwithaK Posts: 955, Reputation: 107
    Senior Member
    		  
    #3

    Dec 14, 2008, 06:12 PM

    Flame sensor could simply be shot.
    superlars's Avatar
    superlars Posts: 2, Reputation: 1
    New Member
    		  
    #4

    Dec 14, 2008, 08:43 PM
    Quote Originally Posted by MarkwithaK View Post
    Flame sensor could simply be shot.

    It's $12 so why not try replacing it. It looks fine though. The furnace worked fine last winter. This was the first time to start it up this winter. But I guess no yellow light speaks to either a faulty sensor or a bad board.
    hvacservicetech_07's Avatar
    hvacservicetech_07 Posts: 1,083, Reputation: 75
    Ultra Member
    		  
    #5

    Dec 14, 2008, 09:12 PM

    Just replace it. I usually replace most flame sensors,unless I don't have one on the truck. You hate to have a call-back on a five dollar part. Check all of your connections.
    Frank Mangrum's Avatar
    Frank Mangrum Posts: 86, Reputation: -3
    Junior Member
    		  
    #6

    May 19, 2012, 09:57 AM
    Quote Originally Posted by hvacservicetech_07 View Post
    Just replace it. I usually replace most flame sensors,unless I don't have one on the truck. You hate to have a call-back on a five dollar part. Check all of your connections.
    Have you tried to check THE FLAME RECTIFICATION CIRCUIT?
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