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. 3 o# i$ ~* w" P2 o . u& ^ \0 k& \The sensors are located on each side of the garage door. You can manually adjust to make them align. 5 U# i+ o9 }/ j* R$ ]. z& n9 F( H9 o, L/ Y$ S/ e
My husband did exactly the same thing and fixed the issue.$ w7 u) K1 L5 X9 q" [) o
p- y0 r* n- b/ GHope this will help you bit. Sorry. I can't type in Chinese now.