Craftsman garage door opener
I have a 4 year old Craftsman 1/2 HP garage door opener. The chain fell off the drive - so I put it back on and re-tightened. Problem is that the door only seems to want to close (and it's already closed). The chain moves about 6 inches (trying to close again) and stops. Every time you push the button - it only wants to close - never open. I've adjusted the up and down limits to the point it probably doesn't know what to do.