If it is hitting the hard stop the motor is tripping the torque overload. Most door openers have open and close limit adjustments check those and set them up properly. On a door there is a low limit a high limit an electric eye across the door and as a last fail safe a torque overload limit. torque limit is normally unchangable you need to adjust the high limit maybe located on the back of the unit. It might be called the up limit and the down limit
SOURCE: My Chamberlin remote garage door opener stopped working.
Try this website for a possible solution
http://www.bearcatco.com/helpgifs/liftmaster_troubleshooting.html
SOURCE: Chamberlain Power Drive 1/2 HP - motor runs but does not move chain
I have the same problem with the worm gear shaved. I bought the replacement part and replaced the worm gear. The door did not travel to the full distance between the limit switch. It hit the upoer limit, stopped. When I pressed the remote again, it only reverse for a short distance and never hit the other end of the limit switch. Any hints what the problems are?
SOURCE: My Sears model 41A4315-7A garage door opener will
Remove the cover and check the drive gear. It is a white nylon gear just in front of the motor and it will be obvious if it is bad. The part number is 41A2817 and is available at any good door opener service company. It comes with instructions.
SOURCE: Access Master 1/3 HP garage door does not close, blinks
Most likely your door sensors are out of alignment. Make sure they are pointed directly at one another.
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