My old Craftsman door opener was having problems closing, it was here six years ago when I moved into the house so I have no idea how old it was. It would open just fine, but after the weather turned cold it did not want to close. I had the same problem last year so I decided to just replace it.
On to the real problem:
I purchased a Craftsman door opener (model #53975) and tried to simply replace the old unit with the new one. Things seemed to go well, it only took a few hours to swap in the new opener for the old one and install Sensor Beams. I expected to have problems with the beams but both lights glow steadily with no flickering that I or my wife can see.
However the new unit will not close or open with or without the door. The Inner Trolley (which is near opener) will move maybe 4"-6". Most of the time it will than reversal itself and return to the starts point. A few times it will stop and I have to hit the door control button to get it to return to it's starting point.
I used almost nothing from the new door kit, a few nuts & bolts along the the Safety Sensors. I also used the new Control Console and new wires. I had hoped no to have to use anything else but that may be what my problem is.