Possibly relevant - I've been working on getting my CT-30 thermostats going, and I've noticed a few quirks:
- the CT-30 doesn't seem to report changes (I had to enable the Z-Wave Thermostat Poll program and tweak it to read the set points, system mode, etc as well)
- the CT-30 reports set points in Celsius with Thermostat.SetPointGet, but will only take Fahrenheit values when setting them with Thermostat.SetPointSet (note that my CT-30 is set to Fahrenheit)
I'm guessing the CT-100 might have similar quirks. I'm using RTZW-01 Z-Wave USNAP modules, for what it's worth (not sure of the specs of the built-in ones in the CT-100).
Hope that helps.