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junebug9449

11:06AM | 06/30/07
Member Since: 06/29/07
1 lifetime posts
Bvelectrical
I have five color wires coming out of my wall for the thermostat, they are white, green, yellow, red, and blue. My thermostat is a honeywell. On the thermostat is a wire code, It says E AUX Y G O L R B C. I don't know what color wire goes into the thermostat code. Can anyone help me?

TimBonham

11:16PM | 07/10/07
Member Since: 01/09/07
197 lifetime posts
This site:

http://www.high-performance-hvac.com/thermostat-installation/hvac-thermostats/thermostats-installation/thermostat-wiring-and-wire-colors/menu-id-66.html

gives a pretty good overview of the wiring colors.

Note that there is a lot of variation, especially in the new HVAC units with 2nd and even 3rd stage heating or cooling. For example, W (white) is normally used for heat, and Y (Yellow) used for cooling. Those colors are (fairly) standard for those functions. But with the new 2-stage & 3-stage units, there will also be W2 & W3 terminals, and Y2 & Y3 ones. But there is nothing standard about the wire color used for those -- it varies in each installation!

Warning -- don't count on the wire color. Many times thermostat wires have been re-done over the years by do-it-yourselfers (like you), but they may NOT have followed the standard colors. The R (red) wire ought to be connected to the R terminal (transformer hot) in the furnace, and the W (white) to the W terminal (heat) in the furnace. But it works fine if different colors are used, as long as they hook up correctly at each end.

So it's a good idea to go down to your furnace, and check that the proper color wires there are connected to the proper terminals.
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