Chamberlain C870 C870 Owner s Manual - English - Page 27
STEP 16 Aligning the safety reversing sensors, STEP 17 Ensure the door control is wired correctly
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Installation STEP 16 Aligning the safety reversing sensors 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. 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. The sensors can be aligned by loosening the wing nuts, aligning the sensors, and tightening the wing nuts. 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. 1 2 3 RED WHITE WHITE GREY Wing Nut Amber LED SENDING SENSOR 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 (invisible light beam) Green LED RECEIVING SENSOR If the receiving sensor is in direct sunlight, switch it with sending sensor so it is on the opposite side of the door. STEP 17 Ensure the door control is wired correctly If the door control has been installed and wired correctly, a message will display on the Smart Control Panel screen. 27