I was on the phone all day with Nest support, my internet service provider, my modem manufacturer, AND router customer service.
Troubleshooting with all 4 yielded the same result: the Nest thermostat simply could not connect to my home wifi.
Nest customer service is issuing me a new device, thanks to an existing warranty. Positive outcome i suppose, but this issue vexed everyone today. All troubleshooting techniques were useless.
Yes you have it.
Another time I have come across this situation, when people apply 240v to the display. People think the Nest is a direct swap for a standard thermostat, but they are not the same voltage. The blue line going round then, is an issue with the display having a surge in voltage through the base connector.
It’s the device design (chip) is defective but Google will not own it and will try to use warranty excuse and not send a replacement for free to address the problem. Check your firmware version too. Many people are reporting 6.2.22 version which nowhere listed by Google and yet it’s pushed on to my thermostat and since then the device does not connect to WiFi and to Nest App.
Well I can believe you are, as I have said in many posts on this forum, NEST are the good guys, Google are not. Ever since Google have taken over, it's been a shambles, but the original Nest staff are very good, and help out as best they can under their circumstances.
They have to spend time with the troubleshooting process, as there are so many users out there who do not have a clue. You knew the issue, but they still have to drill you with questions.
Praise where praise is due, Nest are good . They are for the European area, sadly the USA has to fumble along with Google, as their warranty is only for a year as well.
Good to hear you will be up and running.