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If the pilot light keeps going out, the culprit is probably one of two things, with a third being unlikely but possible: 1  Pilot light line flow set too low, or pilot line dirty or obstructed - The pilot light is just a low-flow branch of the gas line that is always on, maintaining the ignition source for when the burner is turned on.
The pilot is lit every time there is a call for heat by the t-stat. Once the pilot is lit and proved, it lights the main burner. When the call for heat ends, the pilot is extinguished and does not relight until the next call for heat. This creates an automatic and independent control of the gas flow for both the pilot and the main burner. pg 723