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    dallas ringmaster's Avatar
    dallas ringmaster Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Apr 11, 2007, 05:29 PM
    Honeywell Chromotherm III
    My thermostate refuses to come on. It just says HOld AC..
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Apr 11, 2007, 09:08 PM
    You could have lost the 24 volts to the thermostat. It might be just working on battery backup.
    skmink's Avatar
    skmink Posts: 1, Reputation: 1
    New Member
    		  
    #3

    Jun 26, 2007, 07:43 PM
    How do I open my Honeywell Chromotherm III so that I can check the batteries?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #4

    Jun 26, 2007, 09:28 PM
    Two small screws hold it onto the subbase. They are phillips type and are located on the lower left and right sides in the front of the stat. Loosen the screws all the way and lift out and up from the bottom. The hidden hinge is located at the top of the stat.
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