Adjustment; Programming Buttons - LiftMaster 8550C Mode D'emploi

Adjustments
Without a properly installed safety reversal
system, persons (particularly small children)
could be SERIOUSLY INJURED or KILLED by a
closing garage door.
• Incorrect adjustment of garage door travel
limits will interfere with proper operation of
safety reversal system.
• After ANY adjustments are made, the safety
reversal system MUST be tested. Door
MUST reverse on contact with 1-1/2" (3.8
cm) high object (or 2x4 laid flat) on floor.
To prevent damage to vehicles, be sure fully
open door provides adequate clearance.
NOTE: If anything interferes with the door's
upward travel it will stop. If anything interferes with
the door's downward travel, it will reverse.
INTRODUCTION
Your garage door opener is designed with
electronic controls to make setup and
adjustments easy. The adjustments allow you
to program where the door will stop in the
open (UP) and close (DOWN) position. The
electronic controls sense the amount of force
required to open and close the door. The
force is adjusted automatically when you
program the travel and cannot be changed.
To watch a short instructional video on
programming your new LiftMaster garage
door opener. Use your smartphone to read
the QR Code below:

PROGRAMMING BUTTONS

The programming buttons are located on the
left side panel of the garage door opener and
are used to program the travel.
UP (Open)
23
DOWN (Close)
PROGRAMMING BUTTONS
UP Button

Adjustment

Button
DOWN Button