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., c: a3 [+ h1 Z# @4 V( j
9 y; ?/ s. u+ Z5 ]' a8 LThe sensors are located on each side of the garage door. You can manually adjust to make them align.* ?% O! A3 n9 ^+ ]' }) c
4 T) v5 y9 D8 M C; J) iMy husband did exactly the same thing and fixed the issue. # d4 U6 A" e4 h% J8 m, d' y1 }+ w0 f/ u! r
Hope this will help you bit. Sorry. I can't type in Chinese now.