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Hi! My name is ***** ***** I can assist you with this. I may need some additional information from you first in order to give a complete answer.
What was the thermostat that you took out? Did you see the wiring diagram in the lid of the new control box? If you didn't get a new control box and only the thermostat, you need to get the control box too. It won't work without that. When you respond, please give me the make and model of your A/C here and I can assist you further.
Do you have the User's Manual for this and did you replace the ceiling control box as well?
The error codes are E-1 through E-5. I am adding a link to the User's Guide for this installation. Print it out if you don't have it. http://www.primetimerv.com/download/ComponentManuals/Thermostat-SingleZoneDigital-Dometic-OperatingInstructions.pdf