Your garage door keeps opening back up when you close it because its safety reversal system is being triggered by sensors, force settings, or track issues that make the opener think there is an obstruction. The most common cause is misaligned safety sensors near the floor that have been bumped, causing the sending sensor to show yellow and receiving sensor green but not steady, so when you try to close, the door reverses and lights blink. Check sensors for dirt, spider webs, or sunlight interference blocking the infrared beam, and realign them so they face each other and LEDs are steady. Another cause is the close force setting too sensitive, so if rollers are binding due to lack of lubrication or bent track, opener feels resistance and reverses as safety. Adjust close force slightly on opener unit per manual. Travel limits set incorrectly can cause door to hit floor too hard and bounce back. Garage door springs that are weak make door heavy, causing opener to reverse. Also, damaged rollers or debris in tracks cause friction triggering auto reverse. To diagnose, disconnect opener via emergency cord and manually close door to feel for binding. If door closes manually smoothly, issue is sensors or force settings. If it binds manually, fix tracks and lubricate. Professional adjustment costs 75 to 150 dollars. Keep gutters clean to prevent water damage rusting tracks that cause binding.
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