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Failure Connection (Honeywell WIFI Thermostat)
I have had a Honeywell Wi-Fi Thermostat (RTH6580WF) for a number of years now. Within the past 6 months, I purchased a Nighthawk R6400. Since then, i always get "Connection Failure" on my thermostat;...
Try dropping 2.4 GHz mode mode from "450 Mbps" to something lower (changes from 40Mhz mode possible to 20Mhz mode)?
I found this on the Honeywell website: https://yourhome.honeywell.com/en/questions/lyric-thermostat-compatibility-11
Afer my contractor and I spent several hours trying to get a Lyric T6 to connect, I checked my routers for Wi-Fi Alliance certification on their website (https://www.wi-fi.org/) and found that neither of the two are compatible.
Good luck!