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 B# B/ c# p9 r* U2 [; K) }0 R0 A% t, d
The sensors are located on each side of the garage door. You can manually adjust to make them align. Q3 s+ t/ K' x( X5 j U
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My husband did exactly the same thing and fixed the issue. - X. J# s# P) m' Y- G% h$ _' O6 g& }
Hope this will help you bit. Sorry. I can't type in Chinese now.