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.: v/ C+ {$ \5 W$ q" h
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The sensors are located on each side of the garage door. You can manually adjust to make them align. 0 j* i) O' E6 n 9 e% ~. F* d/ X' h2 e2 PMy husband did exactly the same thing and fixed the issue.$ r+ {% L9 ]" \- z% W, S
9 ~( L6 f+ y! O b) v* I) W4 ]9 pHope this will help you bit. Sorry. I can't type in Chinese now.