Record your model and serial number. Call your dealer and have them call Atwood or you can call Atwood direct. There is a service bulletin on certain units that require a change in the flow detection/pressure switch portion of the unit that cause it not to start or operate erratically as you describe. It's a simple 5 minute fix. Problem solved.
94-Newmar Kountry Star 40-KSDP
Spartan/Cummins 8.3C-300HP/Allison 3060 WTEC-II/25yr RV Tech RVIA Certified/Onan-Cummins Certified