Problem scenario
Your Carrier thermostat (e.g., a programmable Comfort (TM) Series Touch-n-Go (TM)) is not working. There is a glitch or apparent malfunction on the screen. All the lights flash on with the backlight turning on — then the display goes dark (unlit with no indication). The heating and cooling does not work. The batteries seem good; the thermostat showed them at two-thirds strength (two of three bars were strong).
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