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.3 g( ~ B* q4 |: F. H. f
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The sensors are located on each side of the garage door. You can manually adjust to make them align. 0 ^3 {' W2 x6 e7 ~" b- K6 e% M# R/ R ) R' D# c$ O; b1 o! A+ S4 ^6 q' hMy husband did exactly the same thing and fixed the issue.- S0 J4 P& d8 G- R& n* Q
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Hope this will help you bit. Sorry. I can't type in Chinese now.