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Bard 8554-019 is an OEM flame sensor with a 0.114 inch sensing rod used on Bard gas heating sections to prove burner flame and keep the ignition control operating safely. When a flame sensor is weak, dirty, or damaged, many units will light briefly and then shut down on flame failure, so replacing it with the correct Bard part helps restore reliable heat cycles and proper safety operation. This is an electrical and safety-related component, so verify your unit model and the exact Bard part number before ordering, and if your unit calls for the updated replacement number, Bard has also sold this flame sensor as 8554-019BX.