Google brought me here, I had the same problem, the door is jamed and won't calibrate, after trying so many things, the only thing worked for me is: During calibrartion I pused the close button and pulled the string down firmly until I got about 10 inches of the string down, then it worked perfectly.
I know this is an old thread, but in case someone lands here like myself
I know this is an old thread, but in case someone lands here like myself