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Bard part number 8403-077 is a pAD single unit controller (thermostat-style wall controller) used to operate a single Bard wall-mount air conditioner or heat pump, providing the local user interface for normal temperature control and basic system interaction. This OEM Bard controller is built with a backlit display for readability in low light, an onboard buzzer for audible alerts, an NTC temperature sensing circuit for accurate room temperature feedback, and a backup real time clock to help retain time-based functions through brief power interruptions. If your existing pAD display is blank, unresponsive, or will not keep correct time, replacing it with the correct Bard 8403-077 helps restore proper command and dependable control of the unit; confirm compatibility by matching the controller part number to the unit documentation or the existing controller label before ordering.