The 10 most common part(s) or condition(s) which contribute to the symptom Refrigerator not cold enough are listed below. 
Refrigeration Compressor (Refrigeration compressor parts)

If the refrigerator is not cold enough, the refrigeration compressor might be defective. The refrigeration compressor is a motor which compresses the refrigerant and circulates the refrigerant through the evaporator and condenser coils. There are several other Refrigeration compressor parts which are more likely to be defective if the compressor doesn't work. If the compressor itself is defective a licensed professional will need to replace it.(Refrigeration compressor parts)
Main Control Board(Refrigeration compressor parts)
If the refrigerator is not cold enough the main control board might be defective. This is not common. Check the defrost system, cooling fans, and cooling controls first.(Refrigeration compressor parts)


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