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    RICK1861's Avatar
    RICK1861 Posts: 1, Reputation: 1
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    #1

    Jun 9, 2008, 08:03 PM
    Central air stays on all the time, even after inside fan turns off.
    I have an old Tempstar A/C unit that stays on after the blower turns off. I replaced the thermostat in the winter and it works fine with the heater (tuns on & off correctly). I removed the new thermostat from the system & the A/C unit still stays on. The only way I can get it to turn off is to turn the breaker off. This an OLD system so there are no circuit boards.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Jun 9, 2008, 08:14 PM
    It could be a defective (contact welded) contactor in the outside unit. That will cause the outside unit to run all the time.

    You might have a short in the thermostat wiring keeping the ac on.
    There might be a a/c blower relay in the furnace that is defective causing the inside blower to run all the time.
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