Before resetting the system while responding to a no heat call, what should be confirmed?

Confirming that there is fuel in the chamber is essential before resetting the system during a no heat call. Ensuring there is sufficient fuel is a fundamental step because without fuel, the system will not be able to produce heat, regardless of other operational conditions. If the fuel is insufficient or absent, resetting the system will have no impact on resolving the heating issue; the system would remain inoperative.

Additionally, verifying fuel levels helps prevent potential damage to the burner and other components caused by running it dry. Understanding the fuel supply is critical to swiftly diagnosing and remedying the lack of heat. This step usually comes before examining other elements like the thermostat, water levels, or burner operations, as these factors become relevant only if fuel supply is verified as adequate.