City & Guilds Level 2 Award in F-Gas Practice Exam 2026 - Free F-Gas Certification Practice Questions and Study Guide

A significant drop in system pressure from the expected range is a strong indicator of a refrigerant leak. When a refrigeration system is functioning properly, the pressure readings should remain stable within a specific range based on the type of refrigerant and the design of the system. A drop in pressure suggests that refrigerant is leaving the system, which can occur through leaks in components such as piping, joints, or seals.

Additionally, understanding system pressures is crucial for diagnostics in HVAC systems. Normal operation leads to predictable pressure values depending on the temperature of the refrigerant and the set conditions of the system. When the pressure falls significantly below these expected values, it indicates that the refrigerant is unable to circulate effectively, which often results from a loss of refrigerant due to a leak. Prompt detection and repair of leaks are essential, as they not only affect system performance and efficiency but may also have environmental implications, especially if the refrigerant is a regulated substance.