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Thermostat wiring and wire color chart thermostat wiring colors code tstat terminal designation color of wire and termination r the r terminal is the power this is a red wire and comes from the transformer usually located in the air handler for split systems but you may find the transformer in the condensing unit. My furnace has a 5 wire configuration and 2 extra wires 5 wire is redblue common yellow green and white the 2 additional wires are from a different source but are red and white i am installing a honeywell eim and it is not powering on. Standard colors used for home wiring what follows here is the standard coloring for wires throughout a home the gauge or size of the wire may change depending on the current flowing through the circuit but the color is a consistent feature black the wire that carries the current from the power source to the outlet or receptacle is the hot wire. The thermostat wiring color code guide by featured guides thermostat wire is made of multiple strands of solid copper wire each wrapped individually with a colored shell and enclosed together inside a protective sheathing during installation the wires are connected to one board that sends certain data through each wire to the thermostat. Well explained tutorial on wire color codes thermostat wiring color code decoded diy with michael borders blower doesnt come on hvac condensate overflow shut off device problem