OEM Upgraded Replacement for American Standard Furnace Flame Sensor SEN0491 by part at Defy Now. MPN: SEN0491. Hurry! Limited time offer. Offer valid only while supplies last. This is a Brand New Furnace Flame SensorThis is a Brand New Furnace Flame Sensor. When the flame sensor goes bad, the furnace will light for several seconds and then turn back off on the flame sensor safety.
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