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    bonboncito06's Avatar
    bonboncito06 Posts: 1, Reputation: 1
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    #1

    Dec 20, 2009, 07:55 PM
    Trane furnace XB90 diagnostic LED light is flashing 4 times
    My furnace does not blow out any heat but only cold air blows out.. trane XB90 and the diagnostic LED light is flashing 4 times... please help we are cold.. the code for 4 times flahinf light says open limit device.
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
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    #2

    Dec 20, 2009, 09:15 PM
    The main limit control is located on the cell panel just below the burner enclosure, with 2 wires connected. Try tapping with the butt of a screwdriver between the terminals. If this restores operation, look for source of overheating (clogged filter, etc.). Pic of similar control, yours may be somewhat smaller.
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