So if you do not have a common wire you will not get 24 volts at the thermostat. Steve, How can I wire my new Honeywell Thermostat model # RTH7560E1001-2010 My old thermostat is a 6 wires Carrier Infinity System A Green B Yellow C White D Red S1 Brown S2 Black, Hi PJ! 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Sorry for the second inquiry—-I didn’t see my first post until I had already sent the second. My lux geo comes with a box that powers the fan and provides power to the thermostat. You would need to trace each of your thermostat wires down at the furnace or air handler and see where they are connected then use the instruction book that came with your new RTH9580WF1005 thermostat to connect the wires correctly. Yellow- Y, Green-G, Light Blue- C, Black-O/B, White- E and Red-R. All of them can transfer except of the White-E. My new thermostat does not have an E terminal and I am struggling to figure out where to connect it. … Now for the problem. If the W wire is not hooked up to anything then you could use it for the C wire. I took a picture and hooked it up the same way, but now the AC isn’t blowing air out the vents. 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