Garage Door Opener Starts To Open Then Stops

When the garage door ascends correctly but stops short it is fully open these are the likely causes.
Garage door opener starts to open then stops. If the door is working properly it should be easy to lift by hand. This indicates that the springs torsion springs in the case of the photo above are working properly and are not the issue. Open up the case and look for a screw type track that moves when the opener runs. Sometimes the limit switch is activated by the movement of a specially shaped nut traveling on this track.
If your garage door opens and suddenly stops it might be because of your logic board. In order to fix this you ll want to make small changes to the close limit setting until the door opener knows to stop once the door has reached the floor. If your garage door is closing fully and then reversing to open again then it may be due to a problem with the close limit switch. You push the button to close the garage door.
A torsion spring has. The garage door can be operated manually by disconnecting the garage door opener from the door using the red pull cord. The logic board receives and responds signals to any remote. When the opener is activated the screw rotates causing the nut to move until it reaches the switch.
The door should then lower easily and you can reconnect the opener. When the door is fully open use a mallet to lightly tap the bent side of the track back into alignment. If not re engage it. Doing this can save you some amount of cash.
You might need to consider replacing it if your door is not working properly or you may purchase a new opener. This is almost always the result of a dirty or obstructed safety feature. Opener runs but the garage door does not move screw drive models make sure the carriage is engaged. Check to make sure the pulley is not boken.
Check to make sure the chain belt assembly is not broken or off its pulley. Replace broken chain belts sprockets or pulleys.