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. & K" A) G1 I; i: |/ V. O: E/ o9 ?; {, C! F0 J, o
The sensors are located on each side of the garage door. You can manually adjust to make them align. ) I: P+ H! b5 ], e0 e9 h / T1 S& B2 e; C: E. YMy husband did exactly the same thing and fixed the issue. / r: M; [9 M% d5 S( Q$ L6 `5 U" ~ Y: X; H, x) z8 L
Hope this will help you bit. Sorry. I can't type in Chinese now.