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The Bard 8620-225 5/16" Defrost Sensor Kit is an OEM sensing component used on Bard wall mount packaged heat pumps to monitor coil temperature and signal the defrost system when to initiate and end a defrost cycle. A weak or failed sensor can lead to nuisance icing, longer defrost times, or reduced heating performance, so replacing it with the correct Bard factory kit helps restore proper defrost operation and protects overall system efficiency. Match this kit to your unit model and existing sensor style before ordering to ensure correct fit and dependable control performance.