Hello,
Please note that the ITC-308WIFI has a special temperature mode.
The trigger conditions for the special temperature mode are:
Enter the setting mode through the SET key then exit.
Enter the setting mode through the app then exit.
In the special temperature mode, ITC-308WIFI will ignore the settings of HD (Heating hysteresis temperature) and CD (Cooling back temperature) and turn on the heating/cooling output. It will not enter the normal mode until the temperature reaches the SV target temperature.
Please refer to this post: