My garage door has the same problem. I phoned Barcol and the guy told me it is a easy fix. Usually because the two sensors above the ground are not in alignment. ( {& z3 f' z. A" a- Z' ?& A7 |2 c/ f% i
The sensors are located on each side of the garage door. You can manually adjust to make them align. 6 M% c6 ^( Y! P/ t0 @; a' {. J" P+ Y4 [3 @# g
My husband did exactly the same thing and fixed the issue. * }# K8 _8 {6 ~4 X o3 _& ]- [1 ?: ?& I1 e
Hope this will help you bit. Sorry. I can't type in Chinese now.