When assessing system pressure, what could indicate you should replace the CO2 bottle?

When assessing system pressure, a lack of pressure readings can indicate that the CO2 bottle is empty or malfunctioning. In a properly functioning system, there should always be some level of pressure if the CO2 bottle is full or at least partially full. No pressure readings often denote that the gas has been completely depleted or that there might be a significant leak in the system that is preventing pressure from building up.

In contrast, constant high pressure readings may signify that the system is functioning under unusual conditions but does not directly indicate that the CO2 needs replacement. Low flow rates can result from various issues in the system, including clogs or restrictions, and do not necessarily mean that the CO2 bottle is empty. Fluctuating pressure levels could suggest issues within the system or regulator but do not directly indicate the need for immediate CO2 bottle replacement. Thus, no pressure readings serve as a clear and indicative sign that the CO2 bottle may require replacement.