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Bard 8620-077 is an OEM primary control and ignition assembly used on Bard oil-fired heating equipment to manage the burner ignition sequence and safety shutdown, helping ensure reliable light-off and proper burner operation. This control assembly is a critical electrical component that coordinates ignition and flame-safety functions, so replacing a failed or intermittent control with the correct Bard part is the safest way to restore dependable starts and consistent heat. Verify compatibility by matching the full part number and checking your unit model and wiring diagram before ordering, since control configurations can vary by furnace series and revision.