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    Wolff87's Avatar
    Wolff87 Posts: 1, Reputation: 1
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    #1

    Feb 13, 2016, 11:12 PM
    Trane furnace thermal protection device
    Thermal protection device open indicator light blinking on a Trane gas furnace how do I fix it.
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
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    #2

    Feb 14, 2016, 10:56 AM
    Probably high limit safety. Look for a small, usually black square screwed to the plenum. Will have 2 wires. Remove wires, test with an ohmmeter, should read zero. You can do a quick test by connecting a jumper across the disconnected wires and see if the furnace fires off. If it does, DO NOT run the furnace, get a replacement first. These usually shut off when the plenum temperature is too high due to reduced airflow. Check ductwork and filters.
    talaniman's Avatar
    talaniman Posts: 54,325, Reputation: 10855
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    #3

    Feb 14, 2016, 05:42 PM
    thermal protection device open indicator light blinking on a trane gas furnace - Bing video
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