A/C repairman on site today.* Discovered a charred wire and lose wire leading to interface board and causing primary compresser to not run.* Cleaned up wires and connections and we are back in business.* He said it looked like several wires had been spliced, etc. and many looked like they had been hot at one time or another.
Since the RVAC is 13 years old it looks like a replacement is in our future.
Thanks for all your help.
Terry