I have been using SmartThings for years in my own house and just installed the TH6320ZW2003 along with a number of other devices in my dad’s house along with a new SmartThings v3 hub. Everything is working well except for this thermostat.
The TH6320ZW2003 device in my app does not show any ability to adjust the heat. I can use a scene to change the temperature but have no visibility to see the setting remotely in the app. The history ocassionally shows the current temperature but never the heat setpoint. I have tried all the different thermostat device handlers including the one specifically for the T6 Pro and none show the heat setpoint or allow it to be changed. The best handler seems to be the ZWave battery thermostat because that one at least shows the battery power level.