@Surprisehouse : glad it finally worked Jeff 
I am sorry, but due to limitations forced by SmartThings forums administrators, I am not able to update the first post of this thread, which would have been MUCH simpler than forcing everybody to read it in full… backward 
The only 2 versions of this custom Handler presently available on github are v0.9.5.1 and v0.9.7.2.
The latest should work for all current versions of the FGK-10x / FGDW-002-x, but the one with the most active users is the v0.9.5.1. If you bought the FGDW-002 or a ZW5 (aka Z-wave+) version of the FGK-10x [Firmware >= 3.2], then you MUST use the latest v0.9.7.2 version.
Due to limitations in the SmartThings Handlers programmatic interface, I was not able to find a way to change colors thresholds when you switch from °C to °F.
To do that, as explained in a previous post (one of the 271 ones… 
), you have to comment lines 109-131 and uncomment lines 132-156 of the v0.9.5.1 Handler (respectively lines 120-142 and 143-167 of the v0.9.7.2 version).
Enjoy !