LiftMaster 8557 8557 Manual - Page 22

Ensure the Safety Reversing Sensors are aligned, 3 Ensure the Door Control is wired correctly

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Power 2 Ensure the Safety Reversing Sensors are aligned The door will not close if the sensors have not been installed and aligned correctly. 2.1 Check to make sure the LEDs in both sensors are glowing steadily. The LEDs in both sensors will glow steadily if they are aligned and wired correctly. When the light beam is obstructed or misaligned while the door is closing, the door will reverse and the garage door opener lights will flash ten times. If the door is already open, it will not close. The sensors can be aligned by loosening the wing nuts, aligning the sensors, and tightening the wing nuts. Amber LED If the receiving sensor is in direct sunlight, switch it with sending sensor so it is on the opposite side of the door. (invisible light beam) Green LED SENDING SENSOR RECEIVING SENSOR IF THE AMBER LED ON THE SENDING SENSOR IS NOT GLOWING: Make sure there is power to the garage door opener. Make sure the sensor wire is not shorted/broken. Make sure the sensor has been wired correctly: white wires to white terminal and white/black wires to grey terminal. IF THE GREEN LED ON THE RECEIVING SENSOR IS NOT GLOWING: Make sure the sensor wire is not shorted/broken. Make sure the sensors are aligned. RED WHITE WHITE GREY 3 Ensure the Door Control is wired correctly If the door control has been installed and wired correctly a message will display on the screen. 22

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22
2
Ensure the Safety Reversing Sensors are aligned
The door will not close if the sensors
have not been installed and aligned
correctly.
When the light beam is obstructed or
misaligned while the door is closing, the
door will reverse and the garage door
opener lights will flash ten times. If the door
is already open, it will not close. The
sensors can be aligned by loosening the
wing nuts, aligning the sensors, and
tightening the wing nuts.
2.1
Check to make sure the LEDs in both sensors are glowing steadily. The LEDs in both sensors will glow steadily if they
are aligned and wired correctly.
Green LED
R
O
S
N
E
S
G
N
I
V
I
E
C
E
R
R
O
S
N
E
S
G
N
I
D
N
E
S
Amber LED
If the receiving sensor is in
direct sunlight, switch it with
sending sensor so it is on the
opposite side of the door.
(invisible light beam)
IF THE AMBER LED ON THE SENDING SENSOR IS NOT GLOWING:
IF THE GREEN LED ON THE RECEIVING SENSOR IS NOT GLOWING:
Make sure there is
power to the garage
door opener.
Make sure the
sensor wire is not
shorted/broken.
RED
WHITE
WHITE
GREY
Make sure the sensor has been wired
correctly: white wires to white terminal
and white/black wires to grey terminal.
Make sure the sensors are aligned.
Make sure the sensor wire is
not shorted/broken.
3
Ensure the Door Control is wired correctly
If the door control has been installed and wired correctly a message will display on the screen.
Power