COULD be that its lift power is not enough. Read manual and adjust 0 V$ p1 X: i% f8 o6 l& J' Y( M8 n; [- e) a* Z' s
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2 V2 L" W6 ?# p! y+ jU can also call Robert garage door 7807073706. Really nice guy. We asked him twice . U an also try ask pay him less money than what he asked. Good luck