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The Bard 8201-081 solid state lockout module is an OEM control component used in Bard wall mount HVAC equipment to monitor safety and fault inputs and prevent repeated compressor operation after a fault condition. When a problem such as a safety trip or abnormal operating condition occurs, this module helps protect the refrigeration circuit by locking out the compressor control circuit until the issue is corrected and the unit is reset. Bard lists 8201-081 as obsolete and typically serviced through the current replacement kit, so confirm your unit model and control box wiring before ordering to ensure correct fit and proper lockout function.