Think that is the error code for loss of communication between thermostat and control electronics. If you remove the filter panel on the ceiling, you should be able to see the electronics module metal box. Make sure they didn't leave a cable unplugged. Inside the metal cover of this box will be a set of dip switches that are used to setup the system to tell it what zone, etc is configured and it should be labelled so you know what switch is what. My living room is zone one, bedroom is zone two and switches reflect bedroom air as zone two. In your case, they may have forgot to flip the dip switch.
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