Thermostat Wire Color Charts (General Summary)

• Blue Wire (Same As Black Wire; C-Wire)
• Red Wire (Power Wire)
• White Wire (Heating Wire)
• Yellow Wire (Cooling Wire)
• Green Wire (Fan Wire)
• Orange Wire (Same As Dark Blue Wire; Reverse Valve Switch)
• Light Blue Wire (HVAC Blue Wire)
Brown Wire (Furnace Wire)

Here are some of the common colors used in HVAC wiring diagrams:

• Black or Red: Typically used for power or hot wires.
• White or Yellow: Usually used for neutral or common wires.
• Green or Bare Copper: Represents the ground wire, which helps protect against electrical shocks.
• Blue: Often used for the common wire in a thermostat or control circuit.
• Orange: Can indicate a heat pump wire or reversing valve control.