The blue wire, or C-wire, is known as the common wire. It’s there to provide power to the thermostat. Older thermostats usually don’t have a C-wire because they either don’t need power or, if they do, they get it from a battery. Modern thermostats are a different story.Click to see full answer. Subsequently, one may also ask, what do thermostat wire colors mean?The white wire is usually connected to the “W” terminal. The thermostat acts like a switch, like a light switch. The Red to white switch turns on the heat. Red to Green turns on the fan, Red to Yellow turns on the air conditioner.Similarly, what color is the C wire for a thermostat? Here are common uses for wire colors: Blue or Black – C – Common wire, may be unused by your existing thermostat. Enables continuous power flow from the Red wire. Red – R – 24VAC power from the furnace’s transformer. One may also ask, where does the blue wire go on a Nest thermostat? A brown wire is mostly likely a heat pump wire and should be connected to the O/B connector on the Nest thermostat. If the B wire is blue, it should most likely be connected to the C connector.What is RC wire on thermostat?If the air conditioning thermostat has one transformer to power both the heating and cooling system, then the wire from the transformer goes directly to the RC terminal and is called the RC wire. This wire is also known as the RH wire.
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