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.$ _# ~" g7 W, C
/ k( X" ~& l. h6 O1 A9 UThe sensors are located on each side of the garage door. You can manually adjust to make them align. " M1 E$ m% n7 v7 u( b& c$ F) b( p) a6 L) y! Q- ~6 Y1 Q
My husband did exactly the same thing and fixed the issue.) X5 g X( W8 R1 t' {
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Hope this will help you bit. Sorry. I can't type in Chinese now.