The most basic thermostat has 2 wires; usually a red and a white wire. Two wire thermostat wiring is used for furnaces only and usually doesnt need a “C” or “Common” wire. Thats why we only need two wires: Red wire for power (24h).

What are the 7 wires on a thermostat?

R, Rc and Rh are red power wires. A blue or black wire is usually marked C, while the a white wire is likely marked W. The wire marked E is likely a brown one, and Y and Y2 are usually yellow. A wire marked G is typically green, while O is orange and B is blue.

What is a C wire for a thermostat?

A common wire (C-Wire) provides Wi-Fi thermostats continuous power by connecting it to a heating and cooling system (e.g. furnace). C-Wires are required on most Honeywell Wi-Fi thermostats, with the exception of the Smart Round Thermostat (formerly known as the Lyric Round).

Will thermostat wires shock me?

Virtually all room thermostats operate on low voltage that carries little risk of harmful electric shock. However, it is always wise to shut off power to a thermostat at the service panel before examining or working on it.

How do I know if I have a line voltage thermostat?

0:512:32Determining Your Thermostat Type - YouTubeYouTube