If beer is coming out of the faucet foamy, what is one potential cause?

When beer is foamy as it comes out of the faucet, one potential cause could be that the keg is warm. When beer is stored at higher temperatures than recommended, it can lead to excessive foaming when poured. This is because warmer beer has a lower solubility for carbon dioxide, which means that as it is poured, the carbonation is released more quickly, resulting in a foamy pour.

While temperature issues can lead to excessive foaming, it's important to note that there are multiple factors involved in maintaining proper dispensing conditions. For instance, if the beer is too cold (which can reduce foaming) or if the pressurization is accurately set (to maintain proper carbonation levels), the pour can be more controlled. Over-carbonation does contribute to foaminess as well, but the specific condition of the keg being warm is a direct trigger for foamy beer at the faucet.

Understanding the proper temperature range for storage and service, alongside monitoring carbonation levels, is essential to achieving a well-poured beer.