Clean the ventilation with canned air. Clogs can stop gas from getting from the tank to the refrigerator.
Refill the LP tank if the levels are low. You need gas to operate a fridge in an RV.
Blow the burner head clean with compressed air. A clogged burner jet could cause improper gas pressure.
Clean the thermostat with compressed air. If the thermostat is dirty, it may not allow the refrigerator to be set at the cold temperature necessary.
Turn the refrigerator upside-down to break up crystallization and to start the solvent flowing again if the unit is overheating.