It goes partway down reverses direction and goes back up again.
Garage door closes a little then opens again.
This is almost always the result of a dirty.
If the garage door does not close completely or begins to close and then opens back up again the down limit switch needs to be adjusted.
To reconnect the garage door to your liftmaster garage door opener manually close the garage door pull the emergency release handle down.
Now press the remote control.
This brain can wear out in time so you could need a replacement.
This will cause the trolley to move into position and reconnect to the garage door.
Your garage door s logic board is the brain of your garage door opener.
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.
When the logic board wears out it can cause your garage door to close then open and vice versa without explanation.
If it closes only partway the safety sensors are usually responsible clean the lenses or realign them and make sure there are no obstacles blocking the beam.
Measure the distance of the gap from the bottom of the.
These steps should fix.
Try opening the garage door with the remote and see what happens.
Get logic board replacement.
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.
If the door closes while holding the button pressed you are likely having one of the following issues with your safety sensors.
If you re craftsman chamberlain etc garage door opener is closing and then opening up its likely a common problem related to the stop limit mechanism.