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The Bard 8400-003 Burner Primary Control is an OEM electrical safety and operating control used on Bard oil-fired heating equipment to manage the burner sequence, including ignition timing, flame sensing lockout, and safe shutoff when a flame is not proven. When a primary control is weak or failing, you may see nuisance lockouts, delayed ignition, or intermittent burner operation, so replacing it with the correct Bard-specified control helps restore proper startup and dependable safety operation. Confirm compatibility by matching your unit model and the existing control part number before ordering, since primary controls can vary by wiring and burner configuration.