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    colepea's Avatar
    colepea Posts: 10, Reputation: 1
    New Member
    		  
    #1

    Apr 29, 2008, 03:31 AM
    No display on thermostat and AC does not work
    This a carrier thermostat with multiple zones and it does not have batteries. After I opened the thermostat there are 4 wires red V+, White = VG, yellow = RS+ & green = RS-. What can I do at this point?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Apr 29, 2008, 05:37 AM
    You could check to make sure 24 volts from the transformer is getting to the base of the thermostat controler. Other than that being a multiple zone thermostat any other repairs would be best left to a professional.
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