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The Bard 8612-021 alarm board is an OEM control module used in Bard controller and alarm packages to monitor system status and manage alarm or fault signaling for supported Bard equipment. Listed in Bard documentation as the Alarm Board B used with AB3000-B and related control assemblies, this board is intended to restore proper alarm monitoring and notification when the original board has failed or become unreliable. For best results, confirm compatibility by matching your unit or controller model and the exact Bard part number before ordering, since alarm board configurations can vary by control package and application.