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Bard 8620-310 is an OEM 10K-ohm sensor replacement kit used in Bard wall-mounted HVAC equipment to provide accurate temperature feedback to the unit controls. When a sensor drifts out of tolerance or fails, it can cause erratic operation, incorrect temperature readings, nuisance lockouts, or poor comfort control. Replacing it with the correct Bard kit helps restore proper control response and keeps the system operating to factory specifications. Match this part number to your unit model and service literature before ordering to confirm the correct sensor location and application.