The LiftMaster K001A6424-1 Logic Board is a genuine OEM replacement control board designed for select LiftMaster medium-duty commercial door operators. As the central controller, it manages open/close functions, motor control, and logic for accessories and safety inputs, helping restore proper operation when a factory board fails. This board is identified for 390 MHz systems, making it suitable for operators that use LiftMaster’s 390 MHz radio technology and compatible remote controls. It interfaces with common commercial accessories such as wall stations, key switches, photo-eye sensors, and sensing edges used on sectional and rolling steel doors in light to medium commercial applications.
This replacement logic board is intended for units that specifically call out part number K001A6424-1 in their parts diagrams or service manuals; always verify compatibility by operator model and serial information before ordering. Installation should be performed by a qualified technician with power removed, transferring wiring harnesses and mounting hardware from the original board as directed in the operator’s manual. After installation, follow the operator’s programming procedures to set travel limits and, where applicable, enroll 390 MHz remote controls and accessories. Test all entrapment protection devices per UL 325 and local codes before returning the door to service. Ideal for buyers searching for a LiftMaster medium-duty control board replacement, commercial garage door operator logic board, or 390 MHz Security+ compatible repair part.