The LiftMaster 041D0277-1 Transformer is a genuine OEM replacement power transformer designed for select LiftMaster garage door openers equipped with built-in Wi‑Fi and Battery Backup. This internal component steps incoming power down to the low-voltage levels the opener’s logic board, motor control circuitry, and charging system require, helping restore reliable operation when the original transformer has failed or degraded. It is commonly used in residential openers featuring myQ connectivity where consistent low-voltage power is essential for daily operation and maintaining the backup battery’s charge.
Use this part by matching the exact 041D0277-1 number to the parts list in your opener’s owner’s manual or exploded diagram to ensure compatibility; it is not a universal transformer. Installation is typically a direct swap inside the opener head: disconnect AC power, unplug or remove the backup battery, then replace the factory transformer using the original mounting points and connectors, taking care to route wiring as shown in the service documentation. No reprogramming is normally required after replacement, but you should test door travel, safety sensors, and the Battery Backup function per LiftMaster procedures. For safety, only service with power removed and follow all manufacturer and local electrical guidelines. This OEM transformer supports LiftMaster Wi‑Fi Battery Backup openers that use myQ technology and Security+ 2.0 accessories; always verify fitment by part number before ordering.