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The most likely cause of this problem is that the door is unexpectedly hitting the ground before the shut off of the motor. It is possible that the door is also jamming which makes the unit think there is an obstruction. If there is no mechanical problem with the door itself, you can make adjustments to the up/down force and the up/down limits. These adjustments are at your lifter motor unit and you should check or download your particular manual. I have linked a video showing the basics for this adjustment. https://www.youtube.com/watch?v=GebkW96Sd_c
Place a 2x4 (or other object that is solid and about 2" thick)flat on the ground in the middle of the door. Activate the opener and lower the door until it makes contact with the 2x4. It should hit the 2x4 and then reverse in the upward direction. It can put pressure on the 2x4 just not stay there. If it reverses then it has passed. If it stays down then find the down force adjustment on the opener and turn it down. This adjustment can be found in your manual and will differ in location from brand to brand of garage door opener. Check the belt/chain for slack when it is running(there is no need to check this on a worm drive opener). If there is more than 3/4" slack then tighten it up with the tension adjuster on the trolley. Check the force adjustments per the manual as well. Do not pay attention to this slack when the door is shut as the trolley arm presses on the opener arm to gain the best seal at the bottom of the door. If you have a screw drive you can lubricate the screw with liquid graphite. All other types need none unless you want to lubricate the nylon gear inside the unit with rail grease, but be careful here and unplug the unit first. If your garage door opener has safety eyes start the door down and then cross the beam. The opener should reverse upward. If it does it passes, if not then call a reputable repair firm. Thanks BB
LED bulbs with leaking motion sensors tend to flicker as well, more so than CFL. I switched to Cooper style - but now my Cooper OS310u will sense motion - and keep sensing motion almost all the time. If it's in test mode - it will shut off but otherwise it keeps sensing it. This is in a garage - and door open or closed does not seem to affect it. I have the same unit working in my basement just fine.
suggestion - don't try LEDs to solve the problem and yes - it will burn out your CFLs real fast.
You are receiving interference from the digi door. You will have to return this unit and go with a different one on a different frequency. Chamberlain makes a clicker that would work well with that unit. Thanks BB
If it hits the floor and then reverses then you will have to first turn up the down force a little bit and try. If it still does then turn down the down travel to stop sooner. If it reverses before it hits the ground then turn up the down force. If this does not do it then more than likely the problem is in the door itself. Thanks BB
try adjusting the close shut off switch.(limiting switch) It sounds like when the door shuts, it has too much pressure. The sensor picks this up and reverses the door.This is a saftey feature. It just needs adjusting