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.- P+ [ {* g) M0 e4 l
0 |1 D$ N: q- h. d! R rThe sensors are located on each side of the garage door. You can manually adjust to make them align. 1 p$ _" D6 \+ V' B8 S! t$ f; f4 N" R% q* X4 l
My husband did exactly the same thing and fixed the issue. 6 y j( `6 n+ x* F, U* j% R8 D( Q5 R5 a% T7 e# h
Hope this will help you bit. Sorry. I can't type in Chinese now.