Dometic Refrigerator's Shore Power

[Dog Woman]

We purchased our Mobile Suites 2005 31RS3 in February 2006 and the refrigerator worked fine off our shore power. We are not yet retired, and have only had time to take it on one trip down to Springfield, OR from Seattle, WA. We stayed in a RV park & had no problems w-refrigerator. However, now with it sitting in our driveway, the refrigerator will not work on AC. When we turn refrigerator to AutoSelect, it automatically goes to gas. All other AC-powered functions work fine. We have studied refrigerator manual and tried every conceivable way to switch to shore power. Our shore power plugin is a 30 amp outlet, but 5er is 50 amp. Any suggestions?