What does an increase in system pressure usually indicate?

An increase in system pressure typically indicates a potential blockage or overcharging in a refrigeration or air conditioning system. When there is a blockage, the refrigerant cannot circulate properly, leading to higher pressures in the system. This could happen in various components, such as the expansion valve, the condenser, or even the evaporator. Overcharging, where too much refrigerant has been added to the system beyond its designed capacity, can also result in an increase in pressure, as the excess refrigerant provides an increased volume for the same amount of system space.

Understanding this relationship is important for diagnosing issues within the system. For example, a technician might notice elevated pressures and subsequently investigate the system for signs of a blockage or check the refrigerant levels to determine if there is an overcharge. Addressing these issues promptly is vital to maintaining efficient operation and preventing damage to the system components.