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/ ^# Z! {; x, [" i% h; l0 b" e 9 J7 H+ J- _. J4 z2 [+ fThe sensors are located on each side of the garage door. You can manually adjust to make them align. 0 P- R+ d" X7 Z# L9 u% U: U& N* x) [6 ?1 K# M" s
My husband did exactly the same thing and fixed the issue.* ]$ |9 x( C2 n4 {+ v7 c
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Hope this will help you bit. Sorry. I can't type in Chinese now.