All RV refrigs must have a good charged 12 volt battery. The controls are all 12volt. If possible move unit to feel the coils on back. RV units make cold with a heater. All RV units use ammonia gas for cooling. Check for any ammonia gas smell. Complete cooling system can be replaced at a cost nearly as a new unit. Our refrig is a 120 volt house/ apartment unit from Costco for $350. The unit works great and can easily freeze ice cream. There is a dedicated small 1000 watt inverter to make lots of electrical power. Frank