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Bard part 8612-026 is the OEM AB3003 alarm board used inside Bard DC3000 Series lead lag telecom controllers that manage three wall mount air conditioning units. This board handles the controller alarm and status functions for the third HVAC circuit, including refrigerant pressure lockout and power loss monitoring, and it provides dry contact alarm outputs so building or shelter monitoring systems can receive clear fault signals for faster troubleshooting. If you are replacing a failed board or restoring alarm functionality after a control issue, 8612-026 is the correct factory matched control component for DC3003 applications, and confirming compatibility with the DC3002 DC3003 controller parts list and wiring diagrams is recommended before ordering.