Since you've already tried the basics, I’d recommend checking if the
Wi-Fi channel is set to 2.4GHz—sometimes the thermostat has trouble with
5GHz. If that doesn't help, it might be worth contacting Nest support
for further troubleshooting or explori...
It is like you've encountered a common issue with smart thermostats and
proprietary systems. Lennox's variable speed technology does indeed rely
on specific commands from the I-Comfort thermostat, so many third-party
options, like the Manga go Nest, ...
