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    eric_myatt86's Avatar
    eric_myatt86 Posts: 1, Reputation: 1
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    #1

    Dec 2, 2016, 09:38 PM
    3 blinks on on york furnace
    The furnace is in the attic. I call for heat. The furnace makes a loud noise, then shuts off. All while happening a red LED light flashes in sequence 3 times. What do I do from here? It says open pressure switch on the troubleshooting chart.
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
    Uber Member
    		  
    #2

    Dec 3, 2016, 09:36 AM
    The loud noise could be a disconnected blade on the inducer striking the housing. Code 3 also means either your inducer fan isn't working, the vent is plugged, the switch is bad or plugged or the tube from the inducer is plugged, leaking or disconnected.
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