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The Bard 8620-106 Defrost System Replacement Kit is an OEM control kit used on Bard wall mounted heat pump equipment to restore proper outdoor coil defrost operation during heating. When a unit is not clearing frost or is short cycling in cold weather, a complete defrost system kit is often the most reliable way to bring the factory sequence back, protecting heating capacity and helping prevent ice buildup that can strain the compressor and fan system. Use this Bard OEM kit when you need a like for like replacement and always confirm compatibility by matching the unit model and serial number to the correct Bard parts list or service manual before ordering.