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When the refrigerator is operating, water moves around the pipes and flows down the coils on the back into the main storage tank. The pipes on the back all slope down from side to side. When the RV is off-level, one direction of the coil will be flowing up-hill and the water flow will stop. When this happens there is no flow to the boiler section and the water in the boiler pipe boils dry. The rust inhibitor dries up and blocks the boiler tube. If the unit is kept running the boiler pipe will get so hot that it will crack from the gas pressure inside the coils. Now the cooling unit is really dead.

Don't believe the stories that the newer units do not need to be run level? They are made to run more off-level than the older units BUT there is still a point where they will stop working. Always try to level you RV, as best you can, and if you have to park for a long time and cannot level the unit, shut down the refrigerator. It will keep the food cold for hours. Most cases of repair for newer units is because they have been run unleveled and cracked the boiler. (This can be a very costly mistake)!