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Bard 8201-102 is an OEM heat pump defrost control board used in Bard wall mount and packaged heat pump systems to manage defrost timing based on the outdoor coil temperature sensor input, helping the unit clear frost from the outdoor coil and return to normal heating operation. If your system will not initiate defrost, stays in defrost too long, or shows inconsistent heating performance in cold weather, replacing the Bard 8201-102 heat pump control can restore correct defrost sequencing and protective logic. Confirm compatibility by matching the part number on your existing board and verifying the unit model and wiring against the Bard service literature before ordering.