Typical Operation; Manual Operation - LiftMaster 841LM Manual De Instrucciones

Operation

Typical Operation

1. With the garage door fully closed, the automatic garage door lock bolt should be protruding
through the track.
2. Open the garage door. The automatic garage door lock should retract before the garage door begins
to move.
3. Close the garage door. When the garage door reaches the fully closed position, the automatic
garage door lock should automatically activate to secure the door.

Manual Operation

1. The garage door should be fully closed, if possible.
2. Disengage the automatic garage door lock by sliding the manual release to the open position.
3. Pull the emergency release handle down and back (toward the garage door opener). The garage
door can then be raised and lowered manually as necessary.
4. To reconnect the trolley, pull the emergency release handle straight down. The trolley will reconnect
on the next UP or DOWN operation.
NOTE: The automatic garage door lock will re-engage when garage door opener operation resumes.
Manual
release
To Disconnect Trolley
Emergency
release handle
To Reconnect Trolley Trolley Connected
Troubleshooting
The garage door doesn't open completely:
• Ensure any manual locks are removed from the garage door.
• Is something obstructing the garage door? Is the automatic garage door lock in the locked
position? Is the garage door out of balance? Are the springs broken? Remove the obstruction
or repair the garage door.
Automatic garage door lock does not activate when garage door opens or closes:
• Ensure your garage door opener is compatible with the automatic garage door lock. All
compatible garage door openers have a Security Shield icon on the outside cover.
• Ensure the automatic garage door lock connector is plugged into the logic board correctly.
• The wires for the automatic garage door lock may be shorted. Inspect the door lock wire at all
staple points and connection points and replace wire as needed.
• Move lock door connector to secondary terminal.
• Call a LiftMaster Dealer for replacement automatic garage door lock. If the problem persists,
you may need to replace the garage door opener logic board or transformer.
The garage door opener won't operate due to power failure:
• In battery backup mode, the automatic garage door lock will unlock when the garage door is
opened, and will remain disabled until power is restored.
• If the garage door opener battery charge is depleted, use the Manual Operation process.
When power is restored, follow trolley re-engage steps. The automatic garage door lock will
work normally.
If the above recommendations do not fi x the problem please refer to your original garage door
opener manual for additional troubleshooting information.
Warranty
ONE YEAR LIMITED WARRANTY
LiftMaster warrants to the fi rst consumer purchaser of this product that it is free from defect in
materials and/or workmanship for a period of 1 year from the date of purchase.