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The Bard 8402-053 manual reset limit control is an OEM safety switch used in Bard HVAC equipment to help protect the unit by opening the control circuit when an abnormal high temperature condition is detected. Because it requires a technician to manually reset it after a trip, it helps prevent repeated cycling on a fault and encourages proper troubleshooting of airflow, heating components, and other causes of overheating. Use Bard part 8402-053 when you need a like-for-like replacement to restore dependable safety cutout operation and proper system run control on compatible Bard wall mounted units and related equipment. Verify fit by matching the original part number and checking your unit model and wiring configuration before ordering.