Chamberlain 248730 - Manual (Page 28)

27
Installation
STEP 16 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.
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 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)
SENDING SENSOR RECEIVING SENSOR
IF THE AMBER LED ON THE SENDING SENSOR IS NOT GLOWING:
1. Make sure there is power to the garage door opener.
2. Make sure the sensor wire is not shorted/broken.
3. Make sure the sensor has been wired correctly: white wires to white terminal and white/black
wires to grey terminal.
RED
WHITE WHITE GREY
3 2 1
IF THE GREEN LED ON THE RECEIVING SENSOR IS NOT GLOWING:
1. Make sure the sensor wire is not shorted/broken.
2. Make sure the sensors are aligned.
1 2