Which of the following is NOT one of the three ways to troubleshoot the BPU?

The correct answer is that visual inspection is not considered one of the three primary methods for troubleshooting the BPU (Balance of Plant Unit). The focus of troubleshooting is typically on more systematic and analytical approaches.

DCS fault code isolation is a crucial method because it involves using the Distributed Control System to identify fault codes that indicate specific issues within the system, allowing for targeted troubleshooting. Symptom isolation is another essential troubleshooting technique, which helps technicians narrow down the problem by identifying symptoms and correlating them to potential causes. Individual component testing is also vital, as it involves checking specific components for functionality and validating their performance through tests, leading to the identification of the root cause of an issue.

While visual inspection can be a useful part of the overall maintenance process, it does not provide the depth of analysis or diagnostic data that the other methods do. It is more of an observational technique and does not systematically isolate faults or verify component functionality in the same structured way as the methods mentioned.