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." x7 M$ q5 B' c2 K6 o
4 z* }: R& Z! f: q9 v# a7 ?& M9 X& KThe sensors are located on each side of the garage door. You can manually adjust to make them align. $ i" D2 _' P6 M" {( w& n9 j J' U. {: x" j! i
My husband did exactly the same thing and fixed the issue. ; _! _; l& R% {. {) U4 ]3 J. m! C0 a; y
Hope this will help you bit. Sorry. I can't type in Chinese now.