LiftMaster 841LM Automatic Garage Door Lock vs LiftMaster 041A6102 Power Door Lock

The 841LM is a smart deadbolt for LiftMaster openers that locks and unlocks automatically and reports status in the myQ app. Owners and reviewers say it works at first but often fails after about a year, with plastic internal gears and housing as the weak point. The 041A6102 is not a smart lock at all. It is a replacement power lock kit for jackshaft openers like the 3800, 8500, 8500W, RJO20 and RJO70. Buy the 841LM only if you want app monitoring and have a compatible opener. Buy the 041A6102 only to replace or add the power lock on a wall-mount opener that supports one.

• Choose the LiftMaster 841LM if you have a compatible LiftMaster opener and want an automatic deadbolt you can check and control from the myQ app.
• Choose the LiftMaster 041A6102 if you own a 3800, 8500, 8500W, RJO20 or RJO70 wall-mount opener and need to replace or add its power lock.