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.4 O. H8 l1 j1 P Z- C4 A/ o+ Y3 n" @' X
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The sensors are located on each side of the garage door. You can manually adjust to make them align. : v# i" q4 `/ g8 ? A3 J c, F6 K- Z; @0 n
My husband did exactly the same thing and fixed the issue.; d0 \8 O/ V" o. G/ F' H) g* C0 _
0 K/ s5 b( K r5 Q. nHope this will help you bit. Sorry. I can't type in Chinese now.