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Bard part number 3003-064 is an OEM wire harness used in Bard wall mounted HVAC equipment to route power and control wiring between factory electrical components and connectors in the unit. When a harness is heat damaged, corroded, or has a loose terminal that causes intermittent faults, replacing it with the correct Bard harness helps restore reliable electrical continuity and proper operation of controls, safeties, and loads. Because harnesses can vary by model series, voltage, and revision, confirm 3003-064 against the wiring diagram and parts list for your exact Bard unit model and serial number before ordering.