What does a system with two high pressures on both sides, low superheat, and high subcooling indicate?

A system that has two high pressures on both sides, low superheat, and high subcooling typically indicates an overcharge. In refrigeration systems, high pressures on both the high side and low side suggest that there is an excessive amount of refrigerant present.

Low superheat implies that the refrigerant in the evaporator is not gaining enough heat from the surroundings, which often means there is not enough vaporization occurring due to the excess refrigerant blocking the normal flow. High subcooling indicates that the refrigerant in the condenser is cooling down significantly after condensation, which can occur when too much refrigerant is present, as there is more liquid refrigerant than the system can efficiently handle.

Thus, the combination of these conditions can be linked to an overcharged system, where too much refrigerant increases pressures on both sides of the system, disrupts proper heat transfer, and can lead to inefficiencies or damage to components over time.