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The Bard 910-1923 LH Od Dry Bulb Sensor Assembly is an OEM temperature-sensing component used in select Bard wall-mounted HVAC systems to report outdoor dry-bulb (ambient) temperature back to the unit controls for accurate staging, economizer and ventilation decisions (when equipped), and reliable overall operation. Replacing a failed or out-of-range outdoor sensor can help correct nuisance lockouts, unstable temperature control, and improper outdoor-air logic by restoring the correct input the control board expects. As with any control sensor, verify your exact Bard model and serial number and confirm the left-hand (LH) outdoor sensor application and wiring connection match your unit before ordering to ensure proper fit and correct readings.