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I am trying everything you guys mention. I adjusted/reset the downforce and the next time i opened the door the reversal happened almost immediately after pushing the button while trying to close. i cleaned and checked the safety lights after i saw 4 blinks of the status light. Can the safety...

I have 3800 liftmasters installed. They are 12 yrs old. One of them is reversing when about 2-3 ft down. It acts like it runs into something and reverses. I find nothing that it hits. This has been intermittent over a couple years, now every time. I unhooked the opener from the door and the...