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.5 O8 e' n; h& E% v
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The sensors are located on each side of the garage door. You can manually adjust to make them align.+ ]* B+ V8 N/ E: w1 n
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My husband did exactly the same thing and fixed the issue. : `$ `7 A5 M$ N; E- ^. U- c! s) ~: {/ b. A N
Hope this will help you bit. Sorry. I can't type in Chinese now.