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.- ?/ A( s4 s; M$ ?
+ }, M) v; _% b6 J! {The sensors are located on each side of the garage door. You can manually adjust to make them align. 8 F; d9 G% X N$ k1 ^1 x8 ~7 o8 O- e" T1 F
My husband did exactly the same thing and fixed the issue. 5 o; K) ]$ z; S, U$ k8 I+ N* M
Hope this will help you bit. Sorry. I can't type in Chinese now.