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I had a look. Nothing like that could be seen. Attached are the pics.

Nothing obvious that I can see. Ocassionally, it does stay shut. How do you adjust "the limits"?

Hello Experts. My background: I am not electric/electronic qualified. My garage door closes and opens on press of a button. There is a black box (connected by a chain) - I believe this is the central controlling unit. I have attached pictures of this. Recently, it opens back on itself after...