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Bard 8402-192 is an OEM limit control used in Bard wall mounted HVAC equipment to monitor heat section temperature and open the control circuit if the unit approaches an unsafe condition, helping protect the heat exchanger and surrounding components from overheating. This control is typically part of the high temperature safety chain and is a common fix when a unit trips on limit, short cycles on heat, or will not stay running due to nuisance overtemperature events. Because limit controls are temperature and application specific, confirm the exact part number and setpoints shown on your existing control or the Bard parts list for your unit before ordering to ensure correct fit and proper operation.