If beer pouring from the faucet is flat, which action should be taken?

When beer is pouring flat, this indicates that there may be an issue with the levels of carbonation. The appropriate response is to adjust the system pressure. Each beer has an optimal pressure setting that maintains its carbonation levels. If the pressure is too low, it will result in a flat pour because not enough carbon dioxide (CO2) is being pushed out of the keg, preventing the beer from retaining its carbonation as it pours.

By increasing the system pressure, you help ensure that the CO2 is effectively forced out of the keg and into the beer, which not only restores the carbonation but also enhances the overall sensory experience, including aroma and mouthfeel. This is a common issue in beer dispensing systems, and adjusting the pressure is often the immediate solution before considering other factors.

The other choices, while they may be related to beer service or quality, do not directly address the lack of carbonation in the pour. Temperature changes could affect beer stability and flavor, changing glassware won't impact the carbonation levels, and switching beer types would not be a logical response if the issue lies with the dispensing system itself.