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. 7 _7 s' r1 y, _6 p3 G 7 Y" [; C" n* nThe sensors are located on each side of the garage door. You can manually adjust to make them align. # }9 _; H' K" s$ b: _( o' I ? ( a/ ^8 E' S1 z- z! ^; f1 X" lMy husband did exactly the same thing and fixed the issue. ! v7 k5 p9 G" U ) Y& d+ C2 S9 ]; WHope this will help you bit. Sorry. I can't type in Chinese now.