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Bard part 8201-023 is an OEM defrost relay service replacement used in Bard heat pump applications to help control the defrost function that clears frost from the outdoor coil during cold weather operation. A failing defrost relay can lead to nuisance defrost issues, poor heating performance, or intermittent operation, so replacing it with the correct Bard OEM relay is the best way to restore proper control logic and reliable cycling. This service replacement is referenced as replacing Bard kit 8620-105, and it is intended to match the original electrical performance and fitment used in Bard wall-mounted heat pump equipment; confirm compatibility by checking your unit model and wiring diagram before ordering.