Bought and hooked up a nest to our American Standard heat pump/thermostat. App says not compatible. It's a 24 volt system but doesn't have/use a white wire. It's got a red, yellow, orange, purple (ground), and blue - 5 wires. Have picture...
Thanks for reaching out. I'd like to take a closer look at it. Could you please share with us the photo of the wires connected to your system's control board? Ensure that the labels of the wires are visible. What is the make and model of your system? Also, in what country are you located?
