How to realign the reverse sensors on a garage door?

To realign the reverse sensors on a garage door, also called safety sensors or photo eyes mounted 4 to 6 inches above floor on each side of door opening that prevent door from closing on obstruction, you need to adjust brackets so sensors face each other and LEDs show steady. First, locate both sensors; one is sending sensor showing steady yellow or amber LED when powered, other is receiving sensor showing steady green when aligned. If green is blinking or off, sensors misaligned. Clean lenses with soft cloth to remove dirt, spider webs, or dust. Loosen wing nut or screw holding sensor bracket to vertical track, allowing sensor to pivot. Adjust sensor by hand, pointing it directly at opposite sensor, ensuring both at same height and level, with no obstructions between them. Watch receiving sensor green LED while adjusting; when green turns from blinking to steady without flicker, alignment achieved. Tighten bracket securely without moving sensor. Ensure sensors not pointing upward or downward. Check wiring connections at motor unit for looseness. Avoid direct sunlight shining into receiving sensor, as sun can overpower infrared beam and cause false reversal; if sun interference, install small cardboard shade above sensor. Test by closing garage door using remote; door should close without reversing, and opener lights should not flash. If door still reverses after realignment, check close force adjustment and track binding. Professional sensor realignment costs 75 to 150 dollars, but DIY takes 10 to 15 minutes.