Actually, per code in Cali, the door should stop & float at 3' from the ground detached from the opener ( balanced load distribution) and move smoothly in either direction. Additionally, it should reverse automatically when it hits a 2" X 4" block laying flat on the ground. 4" width parallel to ground.Thia is a simple repair if you understand the few steps. I just saved my neighbor $700 after his wife backed into door when door wasn't all the way up exiting garage.
Released tension on springs, realigned cables, realigned door, set tension on springs with door all the way down equally on both springs, about 30 1/4 turns on each to a point where you can lift the door with ease to half way to 3/4 up point. Re engaged track opener. WALAA!!! Door company wanted $250 to shut door & come back next day at $500 to make operable... You tube has some great tutorials !