This will cause the trolley to move into position and reconnect to the garage door.
Garage door opener goes down but not up.
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.
Go along with your safety reversing sensors.
Your garage door s logic board is the brain of your garage door opener.
They both have lights and both lights should be on.
Check if the limits are properly set.
Connect the white wire from the sensor to the white terminal of the garage door opener and then the black and white wire to the grey terminal.
T his is a pretty uncommon problem but one that can happen after you ve first installed your garage door opener.
However if your garage door doesn t bounce back up then you know you have a problem.
Now it may be the lower limit switch itself but it s more likely to be a relay or ic problem.
If the door goes up but you can t make it go down you probably need to adjust the sensors.
If the door then goes down when you press the button hit the button again before the door hits the ground and see if it goes up.
To reconnect the garage door to your liftmaster garage door opener manually close the garage door pull the emergency release handle down.
Make sure only the safe t beams that came with this garage door opener are installed.
This brain can wear out in time so you could need a replacement.
This is related to the up limit switch.
Get logic board replacement.
This is almost certainly an electronics problem.
To fix this issue increase the down limit one quarter turn.
Two things stop the lower direction travel of an overhead door.
Try opening the garage door with the remote and see what happens.
Garage door starts down then stops and goes back up or safe t beam system malfunction.
When the logic board wears out it can cause your garage door to close then open and vice versa without explanation.
Now put a step ladder under your garage door opener and climb it.
There is a latch in the circuit that keeps the down motor on until the lower limit switch is tripped.
If your garage door hits it bounces up and starts to open again your garage door is working well.
Other things could be wrong but they are in the weird category.
Check if the safe t beams red led light is flashing.
There is one on each side of the door.
Disconnect the pre wire from the garage door opener.
Adjust the limits as needed.
Try making small adjustments.
Now press the remote control.