Saturday
My thermostat screen shows only two screens, and I can't make stop, I can't connect to my phone Home App. I tried unplugged with no aaa batteries, plug in again, etc. The unit blows just cold air, I guess just circulating fresh air in my house. I checked the wiring and can't be fixed.
Sunday
Post pics of the old tstat wiring and the Nest wiring.
What kind of system do you have gas heat or a heat pump?
Wednesday