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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.
Relevance. Rating Newest Oldest. Best Answer: since you stated that it has a pilot light it has to be a gas furnace. there is a device called a thermo-coupler that senses heat from the pilot light. if it does not sense heat it will not turn the gas burner on.Source(s): smokey Â· 7 years ago. Thumbs up. 2. Thumbs down. 0. 1 comment. Loading ...elevance. Rating Newest Oldest. Best Answer: since you stated that it has a pilot light it has to be a gas furnace. there is a device called a thermo-coupler that senses heat from the pilot light. if it does not sense heat it will not turn the gas burner on.