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 M5 w/ {: @7 N6 W3 C+ P1 m. S! {
% O- [+ C4 v- q4 S( uThe sensors are located on each side of the garage door. You can manually adjust to make them align. . E/ ]6 U3 p0 B; A& f" ] 9 t9 R e! p5 z7 [, vMy husband did exactly the same thing and fixed the issue.) o" v( }6 O& ~# @. q5 v- y
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Hope this will help you bit. Sorry. I can't type in Chinese now.