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The Bard C8107-028-0189 PRG Motor Ctrl Module Service is an OEM programmed motor control module used on select Bard wall-mount units where the blower motor speed and operation are managed by a dedicated electronic control. Replacing a failed or erratic motor control module can help correct issues like no blower operation, incorrect airflow, or intermittent cycling that can lead to comfort complaints and nuisance shutdowns. Because this is a programmed control, matching the exact Bard part number is important for proper motor communication and correct factory logic, so verify the unit model and voltage family before ordering to ensure correct fit and operation.