Field evidence
A Snow Cap in One Corner Is Not the Same as an Evenly Cold Evaporator
The cabinet stayed near 38-40°F while frost concentrated in one area. That physical pattern moved the discussion toward a sealed-system leak rather than a temperature sensor or board.
What the frost pattern contributed
- The wine cooler was warmer than intended at approximately 38-40°F.
- Snow or heavy frost appeared only in one evaporator corner.
- The technical reply identified a refrigerant-leak direction.
- Sensor and control-board replacement were rejected as explanations for the localized pattern.
A similar symptom can have a different cause on another wine cooler. Door leakage, airflow and defrost conditions must be distinguished before a sealed-system conclusion is finalized.
Why a compressor was not the automatic repair
The source asked whether the compressor should be replaced. The reply was no: if a visible leak pattern exists, the leak location and system condition come first. A compressor cannot correct refrigerant escaping elsewhere.
The thread did not report a pressure test, leak location or completed sealed-system repair.
Safe evidence to preserve
- Photograph the frost pattern before defrosting.
- Measure cabinet temperature with a separate thermometer.
- Note fan operation and whether the door seals.
- Record how quickly the localized frost returns.
Refrigerant safety: do not add refrigerant or open the system from a frost photograph. Leak confirmation and sealed-system repair require qualified equipment and procedures.