Google Nest Community

Greetings, I installed a Google Nest and everything seemed fine but now, a few hours later, the Google home apps says the Nest is "Offline" but both the Nest itself and my wifi router states that it's connected. I have tried multiple restarts of both...

Greetings all,I would like to install a Nest thermostat on an older heating system that only has two wires, red and white. The furnace itself has no labels but I can put a multimeter on the red wire and find out what the output is. What's the minimum...