How do I wire my newer thermostat? Wire colors on the thermostat differ from those in the wall?
I've tried and tried, and found several ways to turn the heat on, but that's not much use when it's 90 degrees out! The wiring diagram and the internet were no use.
Go to your air handler (furnace) turn it off and open the cabinet. Look for the thermostat wire and see where they are connected on the air handler. They should be labeled R, W, C (or X), Y, G. You may have others, such as W1, W2, Y1 Y2 etc. If you have