What are some common issues that can affect defrost system performance?

Several issues can affect defrost system performance, including inadequate system sizing, improper installation, and faulty sensors or controls. Additionally, issues such as refrigerant leaks, dirty or clogged coils, and malfunctioning valves can also impact defrost system performance. It is essential to identify and address these issues during the commissioning process to ensure optimal system operation and prevent energy waste and system failures.