What does the term "lockout" refer to in gas ignition systems?

In gas ignition systems, the term "lockout" specifically refers to a safety mechanism where the ignition module shuts down as a protective measure and requires a manual reset to resume operation. This occurs when the system detects a malfunction or hazardous condition, such as a failed ignition sequence or an unsafe situation related to the burner operation. The purpose of this lockout feature is to prevent gas from continuing to flow without ignition, which could lead to dangerous situations like gas buildup.

When the ignition module enters a lockout state, it effectively disables the system, and the technician or operator must intervene to safely reset the system after addressing the underlying issue. This precaution helps ensure that safety protocols are followed and that the system does not inadvertently attempt to reignite without resolving any faults. The other options describe different scenarios, but they do not accurately capture the safety and operational aspect of "lockout" as it pertains to ignition systems.