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    dgraves11's Avatar
    dgraves11 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Jul 27, 2008, 08:40 AM
    AC on Honeywell Chromotherm III on thermostat
    I have a carrier 12 seer ac unit approximately 15 years old. It was working fine until yesterday, the thermostat reads -AC which is a honeywell chromotherm III. What do you think is wrong?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Jul 27, 2008, 01:22 PM
    Usually that means that the thermostat has lost its low voltage power supply. Usually a wiring or a transformer problem in the equipment.
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