Google Nest Community

My nest thermostat gen 2 works fine but will soon be obsolete. I’m migrating to nest gen 4. The next gen 4 doesn’t recognize any power on arc. When I install it back to nest gen 2 it works fine. any suggestions? btw I have two furnaces thus 2 thermos...

I’ve had two nest thermostats for years. Model display-2.5. I’ve started, or maybe just started noticing, that it doesn’t preheat smoothly. It comes on within an hour of the requested heat/time to preheat. It will run for a few minutes, then stop, th...