An interrupted pilot of an automatic boiler does what?

An interrupted pilot of an automatic boiler functions by igniting to establish a flame, which is then verified to ensure it is stable before the main burner is activated. Once the main flame is confirmed to be established and stable, the pilot flame extinguishes. This process is designed to enhance safety by ensuring that the main burner only lights when there is an adequate and stable pilot signal, preventing any unburned fuel from accumulating, which could lead to hazardous conditions.

In this context, the other options describe different types of pilot systems or scenarios that do not align with the interrupted pilot's operation. For instance, a pilot that has been extinguished due to an inadequate flame signal or one that continuously burns like those found in typical home furnaces does not fit the definition of an interrupted pilot. Thus, recognizing the specific role and behavior of an interrupted pilot helps clarify its function within the safety mechanisms of an automatic boiler system.