The easiest way to align garage door sensors, which are the small black safety eyes mounted 4 to 6 inches above floor on each side of garage door opening, is to loosen brackets, point them at each other, and tighten while watching LED lights for steady glow. First, locate both sensors: one is sending sensor that shows steady yellow or amber LED, other is receiving sensor that shows steady green LED when aligned and receiving infrared beam. If green is blinking or off, sensors misaligned. Clean both lenses with soft cloth to remove dirt, spider webs, or dust that blocks beam. Loosen wing nut or screw that holds sensor bracket to track, allowing sensor to swivel slightly. Adjust sensor by hand so it points directly at opposite sensor, level and same height, about 4 to 6 inches off floor, ensuring no obstruction between them. While adjusting, watch receiving green LED; when it turns from blinking or off to steady green without flicker, alignment achieved. Tighten bracket securely without moving sensor. If sensors mounted on different heights, adjust brackets so both same height. Avoid sunlight shining directly into receiving sensor, as sun can overpower infrared and cause false misalignment; if sun issue, shield sensor with small cardboard hood. Test by closing door; it should close without reversing. If door still reverses, check wiring for loose connections at motor unit. Professional sensor alignment costs 75 to 150 dollars, but DIY takes 10 minutes and costs nothing.
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