What should a technician check when responding to a no-heat call?

When responding to a no-heat call, a technician should check the oil level, filter condition, and burner operation because these are critical components that directly influence the heating system’s performance.

Verifying the oil level is essential as insufficient fuel supply can lead to the failure of the burner to activate, resulting in no heat. Checking the filter condition is equally important since a clogged filter can restrict fuel flow to the burner, causing it to malfunction. Additionally, assessing the burner operation is crucial; if the burner is not igniting or functioning correctly, it will not be able to provide heat even if fuel is available.

This comprehensive approach ensures that the technician identifies and addresses common issues that can lead to a no-heat situation, thereby effectively troubleshooting the problem. Other choices may address certain aspects but lack the breadth of critical checks that are necessary for a thorough diagnosis.