First thing when troubleshooting the T-stat and/or air conditioner is to perform a system reset or initialization. This will restore communication and factory default settings.
Follow the below procedure for your specific model thermostat.
SINGLE ZONE LCD THERMOSTAT
A system initialization will need to be performed by the installer after the system is installed.
• Make sure the Single Zone LCD thermostat is in the Off condition.
• Press the “+” button and, while holding it, also press and hold the On/Off Mode button for three seconds. LCD will show ― ― . Press the On/Off Mode button again to turn system off. This completes the initialization.
Comfort Control Center 2
The system initialization shall be initiated with the thermostat turned “OFF” (Either a blank display or clock only showing).
Simultaneously press and hold the MODE and ZONE buttons. The LCD will display “IniT” and all available zones.
Release the MODE and ZONE buttons. Press the ON/OFF button to exit.
Ensure the CT thermostat is Off.
Simultaneously press and hold the Up button and the Mode button for three seconds.
LCD will show “- -”.
This completes system initialization.
In Furnace Mode the system cycles the RV furnace On and Off based on room air temperature and temperature set-point on the CT thermostat. CT thermostat can be configured to operate using an On / Off differential of either 1ºF (-17 °C) or 2ºF (-16.6 °C). This feature is programmed during the system initialization.
To set the temperature differential, the system must be Off. Press the Down () button and simultaneously press and hold the / Mode button for three seconds. Press the Up () button to toggle between “d1” and “d2”, “d1” for 1ºF (-17 °C) differential and “d2” for 2ºF (-16.6 °C) differential.