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There are only two main failures with gas RV refrigerators (Dometic, Norcold and selected other).

1. The RV refrigerator is run unleveled causing the cooling unit boiler to overheat, block and crack
2. The RV refrigerator cooling unit's steel tubing rusts and the ammonia/hydrogen gas leaks out

Note: A few less reputable operators in this industry feel that when the cooling units of these RV refrigerators fail that they can be just recharged without further repair. This is not repairing and the unit will lose its charge quickly.