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    nsu1992's Avatar
    nsu1992 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Dec 29, 2007, 07:39 AM
    No lcd displaying on carrier digital thermostat
    My heating/cooling unit works fine, but the lcd window is not working. Is there a battery that needs to be replaced within the thermostat?
    acetc's Avatar
    acetc Posts: 1,004, Reputation: 79
    Ultra Member
    		  
    #2

    Dec 29, 2007, 07:49 AM
    No display normally means you have no 24 volts to the thermostat, you have no common wire to the thermostat or you have a faulty thermostat. If you have a volt meter check across the "C" and "R" terminals at the thermostat and see if you have 24 volts, if it is a battery operated thermostat, the batteries are for back up if you should loose power to the thermostat. Good luck, Mike
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