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. % d, y2 ]2 w ]& Q, _& R. c/ m9 A9 W: @+ ]
The sensors are located on each side of the garage door. You can manually adjust to make them align. # L6 H6 L* r k- l+ V. d& r $ e, D+ f, s8 V/ U! P6 |8 G9 bMy husband did exactly the same thing and fixed the issue.% b- d& N* W2 _" i" o8 \+ U
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Hope this will help you bit. Sorry. I can't type in Chinese now.