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Solved
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)?
The router should be able to handle 54Mb for some devices and up up higher speeds for others.
Be sure to set WPA and WPA2 and AUTO and see.
Official response:
Thank you for contacting Honeywell.
We sincerely regret the inconvenience caused.
Honeywell thermostats only operate on the 2.4GHz range meaning they are only compatible with wireless 802.11 b/g/n.
They are not compatible with the 5GHz networks, 802.11 n/ac. There is not a need for this compatibility since the thermostat is a low bandwidth device. Also, the 2.4GHz frequency gives a better distance and penetrating power vs the 5GHz range.
That doesn't help. Of course they do not support 5 GHz. They simply won't see it or try to connect.
What you need to know is any restrictions on the 2.4 GHz. That is what duckware is getting at.
