Chamberlain 3840 Manuale Utente

The Chamberlain Group, Inc.
845 Larch Avenue
Elmhurst, Illinois 60126-1196
www.LiftMaster.com

GARAGE DOOR OPENER

Model 3840

Owner’s Manual

■

Please read this manual and the enclosed safety materials carefully!

■

Fasten the manual near the garage door after installation.

■

The door WILL NOT CLOSE unless the Protector System

is connected

and properly aligned.

■

Periodic checks of the opener are required to ensure safe operation.

■

The model number label is located under the light lens on the left side panel

of your opener.

For Residential Use Only

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