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Bard part number 8612-004 is an OEM reactor and switch assembly used in Bard wall mounted HVAC equipment to help manage and protect electrical operation during normal system running. If your unit is experiencing intermittent operation, control issues, or a no run condition tied to this circuit, replacing the 8612-004 with the correct Bard factory part helps restore reliable switching and proper electrical function without guesswork on fit. Match by part number and confirm compatibility to your specific model and serial to ensure the replacement is correct for your control panel and wiring layout.