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Bard part 8402-131 is an OEM single pole limit control used as a temperature safety switch in Bard wall mounted HVAC equipment, opening at 140°F and resetting at 115°F to help protect the heater section and surrounding components from overheating during abnormal airflow or operating conditions. This control is commonly found in Bard electric heat and wall mount heater applications and is designed to restore proper high limit protection when the original limit has failed open, drifted out of range, or is nuisance tripping. For best results, confirm the exact Bard model and serial number compatibility and replace any underlying airflow issues (dirty filters, failed blower, blocked discharge) that can cause a limit to trip.