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  1. #14
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    16,998
    I too, would look at the HX before taking any time to troubleshoot the 3 wire...
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

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  2. #15
    Join Date
    Dec 2011
    Location
    missouri
    Posts
    161
    Is this unit on LP? I think carrier had an add-on lock out timer, and gas pressure switch that tied into in incoming pressure tap of gas valve. I have changed many lock out timers for this problem over the years. As many have said though, I would check hx, that model was bad about holes in cells right above burner opening of face plate. Good luck!

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