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Manual LiftMaster 8550 Garage Door Opener

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Manual

CONTENTS

Preparation. . . . . . . . . . . . . . . .2-3

Assembly . . . . . . . . . . . . . . . . .4-5

Installation . . . . . . . . . . . . . . .6-13

Install the Door Control. . . . . . 14-15

Install the Protector System

. . 16-19

Power. . . . . . . . . . . . . . . . . . 20-21

Adjustments . . . . . . . . . . . . . 22-24

Battery Backup*. . . . . . . . . . . 25-26

Operation . . . . . . . . . . . . . . . . . 27

Features . . . . . . . . . . . . . . . . . . 28

Door Control . . . . . . . . . . . . . 29-30

Remote Control . . . . . . . . . . . 31-32

To Erase the Memory . . . . . . . . . 32

To Open the Door Manually . . . . . 33

Maintenance . . . . . . . . . . . . . . . 34

Troubleshooting. . . . . . . . . . . 35-36

Accessories. . . . . . . . . . . . . . . . 37

Warranty. . . . . . . . . . . . . . . . . . 38

Repair Parts . . . . . . . . . . . . . 39-41

* If applicable

ELITE Series

Garage Door Opener

LiftMaster

845 Larch Avenue

Elmhurst, Illinois 60126-1196

■ 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 garage door opener are required to ensure safe operation.

■ The model number label is located on the left side panel of your garage door opener.

■ This garage door opener is ONLY compatible with MyQ

and Security✚ 2.0™

accessories.

■ DO NOT enable the Timer-to-Close feature if you are installing the garage door

opener on a one-piece door. The Timer-to-Close is to be used ONLY with sectional

doors.

NOTE: If you are installing the garage door opener on a one-piece door, visit

www.LiftMaster.com for installation instructions.

www.LiftMaster.com

Serial Number:

Date of Purchase:

Models

• 8550 - DC Belt Drive

with Battery Backup

• 8557 - 3/4 hp

Belt Drive

FOR RESIDENTIAL USE ONLY

Write down the following information for

future reference:

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