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    jwpawpaw's Avatar
    jwpawpaw Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Feb 5, 2013, 01:44 PM
    Intertherm furnaces
    My furnace will light and come on but then flame is going out MD# IS MGHA 070 ABFC- 05 my flame is turning yellow when fan comes on , there are no visible cracks in heat exchanger. I had a metal roof put on last year, could it be I need to extend roof vent or does it sound like bad heat exchanger?
    Grady White's Avatar
    Grady White Posts: 1,417, Reputation: 59
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    #2

    Feb 5, 2013, 07:39 PM
    If the flame is changing color when the fan comes on it's a strong indication of exhaust gasses being recirculated into the combustion area.
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