可能性很多:" O8 z. a( D, q% R, n5 N5 j
彈簧老化或斷裂,' ~7 t: |: Y g& R
OPENER有問題, 3 N' Z j! H7 J- \ w開關制出問題,6 } E+ `5 g9 ^- N& q, a5 k# l' l9 T* m
電眼鬆脫移位,- y a6 H; e; |6 q9 @/ n
滾輪移位或需要潤滑
~8 ?1 f" k9 G1 X( U2 y780-9840801 garage door plus (non chinese) & X, [: X C" ]; V . G6 w8 z: \' X$ o* b0 |/ iPls note: no affiliation, hire at your own risk.