What do you do if your garage door opener is in malfunction but the LiftMaster Hub is not? This would indicate that the garage door opener is not properly communicating with the LiftMaster hub.
You’ll want to ensure that the garage door opener is within communication range of the LiftMaster hub. That range is over 900 feet open air for an 828LM. For an 821LM, the hub should be installed on the ceiling in the garage where the garage door opener is located, and the 821LM hub should also be within 30 feet open air of the tilt sensor that is installed on the garage door.
-First thing to try would be to Open and close the door from the garage door opener’s wall control. A
manual update of the garage door’s status can restore communication.
-Failing that, let us know and we can send an update command that should get things working.
-Lastly, if the above steps are followed and your’e still seeing the malfunction it is recommended to
delete the door and relearn it into the LiftMaster gateway.