Thermostat Wire. Thermostat wire comes in a bundle with the outer jacket of the thermostat wire being either brown or white. The bundle can have anywhere from 2 conductors inside the bundle or outer jacket and all the way up 8 or 10 conductors inside the outer brown or white jacket.What color is the common wire in a thermostat?
The common wire is usually blue or black, but that is not guaranteed. The previous homeowner may have made the wires whatever color they wanted or they could have run any wire they had available, so never rely on color alone. Regardless of color, the common wire is connected to the C port inside your thermostat.What do thermostat wiring colors mean?
So, this is what you might expect to see in terms of colored wires and what they mean: White - The white wire is what connects to the (auxiliary) heat on your system. Yellow - The yellow wire connects to your compressor. Green - The green wire connects to the fan. Orange - This wire connects to your heat pump (if you have one). Red - Now, there can be two separate wires for this. ... Blue - This is your common or "C" wire.