Chamberlain 93002MC Manual page 18

Installation
(continued)
9
Align the safety reversing sensors
The door will not close if the sensors have not been installed and aligned correctly.
The LEDs in both sensors must be glowing steady, which indicates they are powered and aligned correctly. The sending sensor (with an amber
LED) transmits an invisible light beam to the receiving sensor (with a green LED). If an obstruction breaks the light beam while the door is
closing, the door will stop and reverse to the full open position. If the door is already open, it will not close.
TO ALIGN SENSORS:
The sensors can be aligned by loosening the wing nuts, aligning the sensors, and tightening the wing nuts.
If the LEDs are not glowing steadily:
Amber LED
Sending Sensor
• Check that both sensors are installed inside the garage, one on either side of the door.
• Check that sensors are facing each other with the lenses aligned and the receiving sensor light does not receive direct sunlight.
• Check that sensors have the same measurement, no higher than 6" above the floor.
Amber LED is not lit:
• Check there is power to the garage door opener.
• Check the sensor wire is not shorted/broken.
• Check the sensor has been wired correctly: white wires to white terminal and white/black wires to grey terminal.
Green LED is not lit:
• Check that the sensor wire is not shorted/broken.
• Check that the sensors are aligned.
(invisible light beam)
If the receiving sensor is in direct sunlight,
switch it with sending sensor so it is on the
opposite side of the door.
18
Green LED
Receiving Sensor
(will have sticker on back)