What is a common symptom of low refrigerant levels in a system?

A common symptom of low refrigerant levels in a refrigeration system is frost buildup on the evaporator coils. When the refrigerant level is low, it can lead to insufficient pressure within the evaporator. This reduced pressure causes the temperature of the evaporator coils to drop significantly, allowing moisture from the air to freeze on the coils. As more ice accumulates, it can further impede airflow and decrease the system's overall efficiency.

The other symptoms listed, such as ice formation on condenser coils, overheating of the compressor, and noisy operational sounds, can occur for various reasons unrelated to low refrigerant levels. Ice on the condenser coils often signifies issues with airflow or heat exchange rather than refrigerant quantity. Overheating compressors are typically linked to factors such as electrical issues or inadequate lubrication, and noisy operational sounds could arise from mechanical failures or wear and tear. Understanding these distinctions is crucial for effective troubleshooting and maintenance of refrigeration systems.