Our coach has the RVP/Coleman ACs and thermostat. I know from experience that the controller sends check signals to the various devices. If it does not receive an acknowledgement it produces an error, and the thermostat will lock up with that error code. Just shutting it off then on will not fix the problem. If your thermostat is the same as ours, you have to place the thermostat in the Off positon, remove the cover, then remove the glass fuse on the control board. Wait at least 5 minutes before replacing the fuse, and turning the thermostat back on. I was given this information by a Coleman service tech. Hope it works for you.
Jim and Lynda, (Sophie, Jake, attack trained killer Shi-Tzus :-))
2003 Fleetwood Expedition 38N 2005 Saturn Vue