I replaced the sprocket on my garage door opener several weeks ago. The
opener worked well for several weeks after that, however, now the door
reverses during the down cycle. The opener lights do not flash and there is
no visible obstruction. The garage door is a one-piece door. Now when
initiationing the the close cycle the 'straight door arm' is abruptly forced
to one side and the garage door bucks (moves significantly from side to side
in the up position) and the close cycle stops. I haven't changed any of
the 'limits' since installing the new sprocket. And I am hesitant to change
the limits without some more information about why the door can't close.
Any ideas what is creating this problem?