First thing to do is initialize the thermostat.
Quote:
System Initialization
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 condi- tion. See page 4, "Quick Reference To Control Buttons". • 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.
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If that doesn't work you can try cleaning the contacts on the cable connector ends.
After that you may want to take it back to the dealer.