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The Bard 8620-224 3/8 in Defrost Sensor Kit is an OEM replacement sensing component used on Bard HVAC equipment to monitor coil temperature conditions and help the unit initiate defrost only when needed, supporting reliable heating operation and helping prevent ice buildup that can reduce airflow and efficiency. This kit is a practical fix when troubleshooting nuisance defrosting, persistent icing, or defrost faults tied to a failed or out of range sensor. Install it in the factory sensor location, route the lead the same way as the original, and verify compatibility by model and serial number because Bard applications can vary by unit series and control strategy.