There is one on each side of the door.
Garage door goes up but not down.
To fix this issue increase the down limit one quarter turn.
If your garage door hits it bounces up and starts to open again your garage door is working well.
If you find that your garage door closes part way and then goes back up this can be triggered by objects on the ground blocking their path such as garbage cans or toys.
This is almost always the result of a dirty or obstructed safety feature.
It could also be caused by a buildup of debris on the tracks that prevents the rollers from moving forward.
This could include small items like rocks gum or mud buildup.
Safety sensors if the door goes up but you can t make it go down you probably need to adjust the sensors.
It goes partway down reverses direction and goes back up again.
You ll then want to test it again and if it s not right keep adjusting the down limit nob until your garage door hit the board and bounces back up.
You push the button to close the garage door.