There's been a rash of "E1" reports lately on here. It's possibly a bad connection on one end of the 3-wire cable.
One thing you can try in order to get it back working is to initialize the thermostat.
On page 3 of the manual linked above is the procedure for doing that. I posted it below for convenience.
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 should contact your dealer to get it resolved.
There is a list of things to try to get it working, but on a unit that new, I'd just have the dealer fix it.