definitely pull the outside panel off and take a look. Just use a nickel or quarter to turn the latches 90 degrees and pull out. There should be a 120v household style outlet behind the door. Make sure the refrigerator is plugged into this outlet.

The refrigerator requires 12v DC for both AC and DC operation so check all the fuses in the breaker panel as well as on the back of the refrigerator. If the refrigerator is plugged into the RV check the outlet for power or try unplugging it and running a separate extension cord from the house to the refrigerator.