The LiftMaster 41A5021-9G-315 Receiver Logic Board Assembly is an OEM replacement control board for select LiftMaster Security+ models that operate on the 315 MHz frequency. This assembly restores the opener’s core functions by managing the motor, integrated radio receiver, work light control, wall console interface, and safety reversing sensors. Designed for residential garage door openers with the purple Learn button, it supports compatible Security+ 315 MHz accessories such as 371LM/373LM remotes and the 377LM wireless keypad. To ensure compatibility, match 41A5021-9G-315 to the exact part number printed on the existing board; it is not interchangeable with 390 MHz versions or boards with different suffixes.
Installation involves disconnecting power, removing the opener’s light lens, swapping the wire harnesses to the new board one-for-one, properly routing the antenna lead, and securing the assembly before restoring power. After replacement, reprogram door travel limits and force settings, then use the Learn button to program remotes and keypads. Verify photo-eye alignment and test the safety reversal system in accordance with UL 325 practices. The 41A5021-9G-315 is intended for select LiftMaster residential chain- or belt-drive openers using Security+ rolling code at 315 MHz; it will not work with units that use orange/red 390 MHz Security+ or newer yellow Learn button Security+ 2.0 systems. For best results and safety, service should be performed by a qualified technician and static-sensitive handling precautions should be observed.