Yeah, it's pitiful. As you say they have a hardware/firmware problem and
fail to address it. Nest was great before Google got their grubby mitts
on them. We had a Gen 2 that worked great for years (pre Google
acquisition) and replaced it with a Gen 3...
Go through the troubleshooting steps on the Google Nest Thermostat
Support Page. Eventually you'll get to a page that has an option "Get a
Call". Select it, they'll call you. You'll then need to suffer through
an hour with a support tech going throug...
Good grief, that would drive me up a wall. I called support, after 59
minutes and 31 seconds on the phone with 'em they're sending me another
display. In the meantime the 1st line support person led me down a path
and now the current thermostat reads...
Deja Vu all over again. Bought a Gen 3 thermostat from Crutchfield
7/19/22 to replace our Gen 2. We wanted the remote sensor capability.
About 2 months later it lost WiFi with the nest.com/w5 error. GoogleNest
sent us a replacement thermostat display...