I signed up for the BetterPlan product from Southern Electric and was intrigued by the RJ45 port on the underside of the monitor that they supplied.
Curiosity finally got the better of me and I connected it to my router via an ethernet cable...
The display mostly cleared, and the temperature reading appeared to drop by 10 degrees, then slowly recover.
I fiddled with some of the buttons, et voila - factory reset !
A month's worth of data lost and the monitor couldn't contact the base station. I think that the temperature refers to the radio channel, but it was easier just to reset the base station as described in the manual.
Nothing ventured...
