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    needhelp59's Avatar
    needhelp59 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Jul 7, 2010, 06:09 PM
    Air conditioner won't turn off.
    My thermostat is very old. The air conditioner turns on when it should but it won't turn off after the room cools, it just keeps running. Do I need a new thermostat.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Jul 8, 2010, 01:41 AM

    It could be the thermostat OR it could be that the thermostat wiring is shorted OR it could be the contactor in the outside unit is welded shut.
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