This is done with the help of sensors in the motor and on each side of the opening near the floor and mounted on the tracks.
Garage door issues opening.
Garage door won t open with remote fix.
If you garage door is lowering then reversing.
As with many such problems the most common problem is the simplest one the motor unit has been unplugged.
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.
Check to see if the trolley has been disconnected.
The garage door cable enables you to pass through a heavy door safe and sound.
Replace the circuit board if the outlet has power but there s no sound or no lights when you push the wall switch and remotes you probably have a bad circuit board.
Garage door reversing before closing garage door openers manufactured after 1993 include sensors to prevent a door from closing on a child or pet.
Finally it s possible the garage door opener s motor.
Generally for automatic garage doors cables balance out the lifting of the door s massive material so that it would just swiftly go up and down when the sensor is activated.
It s also possible that the circuit breaker fuse or gfci outlet powering the door opener circuit has tripped or burned.
The trolley moves along the chain drive the long track attached to the ceiling when the garage door is opening or closing attached via a metal.