G terminal: Activates the blower fan to move air through the ducts. Common ground: A bare or green wire ties the system to the building ground for safety.
Thermostat Wiring Troubleshooting Tips: Solving Common Wiring Issues
The most common letters you will see are R, W, Y, G, and C, each with a specific role in delivering power and commands. O and B terminals: Control reversing valves on heat pumps, switching between heating and cooling modes.
Power Sources and the Transformer Most residential thermostats operate on low voltage, which is supplied by a transformer located near the furnace or air handler. W terminal: Controls heating, typically signaling a furnace burner or heat strips.
Thermostat Wiring Troubleshooting Tips
Compare your findings to a generic thermostat wiring chart for your system type. Whether you are upgrading to a smart thermostat or troubleshooting an old dial model, the wiring diagram is the map that tells your device how to communicate with your heating and cooling system.
More About How thermostats are wired
Looking at How thermostats are wired from another angle can help expand the discussion and give readers a second clear paragraph under the same section.
More perspective on How thermostats are wired can make the topic easier to follow by connecting earlier points with a few simple takeaways.
