What could indicate that a refrigeration system is overcharged?

Frost buildup on the evaporator coil is a strong indicator of an overcharged refrigeration system. When a system is overcharged, it can lead to excessive pressure within the evaporator. This pressure increase can cause refrigerant to not evaporate properly, resulting in moisture freezing on the coil instead of circulating as a vapor. Frost or ice buildup restricts airflow and can lead to other problems, such as reduced efficiency and potential damage to the system, due to inadequate heat exchange.

In a well-functioning refrigeration system, the evaporator coil should remain relatively clear, with only minimal frost under normal operating conditions. When frost accumulation becomes excessive, it typically indicates that the system is unable to maintain optimal refrigerant flow and heat exchange, thus confirming the overcharge condition.