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.$ k7 c" j8 B# K1 s2 z+ R+ q
. X- q" a# C1 V2 s jThe sensors are located on each side of the garage door. You can manually adjust to make them align.: V- Y& x$ h$ x- k' M' Y& C
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My husband did exactly the same thing and fixed the issue. ! N- X7 ~$ [; q3 d0 n; v% a+ s6 u6 a9 h8 ^ \
Hope this will help you bit. Sorry. I can't type in Chinese now.