RJT
Titanium
- Joined
- Aug 24, 2006
- Location
- greensboro,northcarolina
Can someone explain to me how a garage door opener knows when it is at the top of it's stroke? About once a month mine overtravels into the hard stop. I have to loosen up the chain, push it off the stop and then it works agian for about a month. Is there some kind of transducer on the sprocket, or sensor on the position of the door (like the beam at about 6 inches off the floor to make sure nothing is in the way when coming down)? I can't see how it works. Its a liftmaster 1/3 hp professional series, about 2 years old. The manual is long gone. Thanks, RJT