Hi Cowboy 70,
It seems that you knew more than I did.
This is an extract from the manual.
It will illuminate and glow orange
when the outside air
temperature is between 39ºF
(4ºC) and 32ºF (0ºC). It will glow red
when the temperature is below 32ºF
(0ºC).
So now Iknowas well.
Thanks for making me check.