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Bard part number 8602-066 is an OEM humidity sensor used with Bard wall-mount HVAC control systems to measure indoor relative humidity and provide a stable signal back to the controller for features like dehumidification logic and humidity-based ventilation strategies. Replacing a failed or drifting humidity sensor can help correct nuisance alarms, inaccurate humidity readings, and comfort complaints by restoring proper feedback to the unit controls. As a genuine Bard replacement component, 8602-066 is intended to match factory electrical characteristics and connector compatibility for straightforward service work when installed per the applicable Bard unit or controller manual.