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.* b& W, k9 \2 r% [" z- Q
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The sensors are located on each side of the garage door. You can manually adjust to make them align.# o" V* @1 v b5 i& H2 y
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My husband did exactly the same thing and fixed the issue. & ?; u1 M5 {/ k 9 F; V% H- i9 Y* DHope this will help you bit. Sorry. I can't type in Chinese now.