Welcome to the forum!
Have you performed the Dometic stat's hard reboot procedure in the mfg. manual that came with your Airstream paperwork?
"Dometic stat hard reboot" search results using the new search function in the blue box above:
https://www.google.com/search?q=dome...com&gws_rd=ssl
You could also flip all related 120-volt and 12-volt circuit breakers off/on, disconnect from and reconnect to shore power, and make sure the date and time are roughly correct in the stat's readout. Yes, sounds weird . . .
Good luck!
Peter