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.# y% d! G, W+ U- m' ]8 G
* i# k! r2 k/ a# }5 [The sensors are located on each side of the garage door. You can manually adjust to make them align.( H9 N8 i! h) j( u1 o+ z( t. o H
/ R, m9 A$ J4 P" `6 ZMy husband did exactly the same thing and fixed the issue.9 u5 \: z- e, U. M7 g n
V, g. V% N+ m& m8 {# H
Hope this will help you bit. Sorry. I can't type in Chinese now.