可能性很多: . D+ p0 }1 p4 V1 X( A. a彈簧老化或斷裂,- l- z" T* x' w% u
OPENER有問題, 9 J; D! E, G k+ T/ b. @開關制出問題,3 s5 F* m" R* c1 ]; B' P. v l. x2 @' t# ~
電眼鬆脫移位,% Q! s* K" g6 S' z. y
滾輪移位或需要潤滑
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780-9840801 garage door plus (non chinese), i! `- T8 f/ P1 {6 V# b
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Pls note: no affiliation, hire at your own risk.