The clearest sign of a sealed-system fault is a refrigerator that runs constantly but cannot get cold, often with a warm or only slightly cool cabinet and a compressor that is hot to the touch. Simpler faults, a failed fan or a stalled defrost, usually cause icing or one warm section rather than a whole-cabinet failure to cool.
The sealed system is the refrigerant circuit: the compressor, condenser, evaporator, and the tubing that connects them. It is a closed loop, and when it develops a leak, a restriction, or a failed compressor, the refrigerator loses its ability to move heat. Because sealed-system work requires recovering refrigerant and brazing, it is the most involved refrigerator repair, so it is worth confirming before assuming the worst.
Before pointing at the sealed system, we rule out the common, cheaper faults. A failed evaporator fan warms the fresh-food side while the freezer stays cold. A stalled defrost cycle ices the evaporator until airflow chokes off. Dirty condenser coils make the compressor work too hard. Each of these mimics a cooling failure but is a far smaller repair, which is why a careful diagnosis matters.
True sealed-system symptoms are more specific: a cabinet that will not drop below room-ish temperatures despite constant running, frost or oil traces at a tubing joint, a compressor that hums but does not cool, or a unit that cools briefly after a restart then quits. On a premium built-in, a sealed-system repair can still be worthwhile given replacement costs, but only after the simpler causes are eliminated. We give owners the honest picture before any refrigerant work.
Quick Reference
| Symptom | Likely Area | Repair Size |
|---|---|---|
| One section warm, other cold | Fan or airflow | Small |
| Ice on evaporator, then warms | Defrost circuit | Small |
| Runs constantly, still warm | Sealed system or coils | Medium to large |
| Frost/oil at a joint | Refrigerant leak | Large |
| Compressor hot, no cooling | Compressor | Large |
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