The LiftMaster K001A6424 Logic Control Board (Medium Duty) is an OEM replacement main control board engineered for select LiftMaster commercial door operators in the Medium-Duty platform. It serves as the operator’s central controller, managing motor direction for open/close/stop, interfacing with wall controls and radio receivers, and handling safety circuits such as photo-eyes and edges. Use this board to restore normal operation when the original control board has failed or is intermittent, preserving core functions like standard control terminals, diagnostics, and accessory support in compatible LiftMaster commercial garage door openers.
Installation is a direct swap for units originally equipped with board K001A6424; disconnect power, observe ESD precautions, move wiring harnesses to the matching terminals, and secure the board in the factory location. After replacement, follow the operator’s manual to re-establish limits, accessories, and any features such as timer-to-close. Compatibility should be confirmed by matching the part number on the existing board or by referencing the operator’s illustrated parts list; this board is intended for select LiftMaster Medium-Duty commercial operators and is not universal across all LiftMaster models. For safe operation, ensure required entrapment protection devices are present and functional, and verify proper wiring and controls before returning the door to service.