Additionally, thermostat wiring colors are not standardized. There is no official standard for thermostat wire colors.
Furthermore, the thermostat wire colors below are the most likely colors used for most installations however, your thermostat wire colors may be different than what the indication is here. Always turn the power off at the air handler and the condenser and make sure there is no voltage at the transformer before proceeding. 
Thermostat Wiring Colors Code | HVAC ControlĪlways follow the thermostat manufacturer’s instructions whenever changing the thermostat.
Please check this article for a checklist of things to check before calling a heating and cooling repair service. Sometimes, the thermostat is not the problem.
S1 and S2 Wires - connects to S1/S2 terminals and is for outdoor temperature sensor. X or Aux-Wire - connects to X terminal and is for auxiliary. E-Wire - connects to E terminal and is for Emergency heat. O or B-Wire - connects to O or B terminal and is for reversing valve operation. C-Wire - connects to C terminal (common 24v power) with the C wire. G-Wire - connects to G terminal and for fan operation with the green wire. W2-Wire - connects to W2 terminal and for heat stage 2. W-Wire - connects to W terminal and for heat stage 1 with the white wire. Y2-Wire - connects to Y2 terminal and is for cooling stage 2. Y-Wire - connects to the Y terminal and is for cooling stage 1 with the yellow wire. RH-Wire - connects to RH terminal RH heat. RC-Wire - connects to the RC terminal RC red. 
Red-Wire - connects to the R terminal with the red wire.
Thermostat Terminal Designations Quick Guide - Detail Wiring Color Guide Below.Essential Thermostat Wiring Color Guide Including Manufacturers Instructions.Thermostat Wiring Colors Code Page Navigation
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