During the annual tune-up, what should be done if the burner is not operating efficiently?

When a burner is not operating efficiently during an annual tune-up, the most appropriate action is to adjust settings and retest efficiency. This approach allows the technician to identify any specific issues affecting performance, such as improper fuel-to-air ratios, clogged filters, or misaligned components. By making adjustments, the technician can restore optimal operation and ensure that the burner meets efficiency standards.

Taking this immediate corrective action is beneficial because it addresses potential performance problems on-site, saving the customer from future issues and unnecessary expenses. After adjustments are made, retesting the efficiency ensures that the burner is functioning properly and complies with operational standards, thus maximizing fuel efficiency and safety.

The other options involve more drastic measures or delays that may not effectively address the issue at hand. For instance, replacing the burner immediately may not be necessary if the efficiency problem can be resolved through adjustment; waiting for the customer to call delays the resolution of the issue; and reporting it to the technician supervisor could be appropriate but does not address the immediate need to ensure the burner is functioning efficiently. Therefore, adjusting settings and retesting is the most proactive and effective approach in this scenario.