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.
Garage door won t stay closed liftmaster.
This will cause the trolley to move into position and reconnect to the garage door.
When the lock button is on the garage door opener will work from the door control but the remote controls are locked out.
If your door control has a lock button it may have been turned on.
To reconnect the garage door to your liftmaster garage door opener manually close the garage door pull the emergency release handle down.
First check the sensor lights.
Press the lock button to turn this feature off.
Unlock the lock button.
Test the garage door to see if it stays closed.
There can be a few reasons as to why your garage door won t stay closed and by doing some snooping and checking a few parts of the garage door system you ll be able to see what s really going on.
As you suggested you likely just need to adjust the down limit travel or the closing force.
Depending on the brand.
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Continue to adjust the limit screw until you find the proper setting.
Clutter or obstructions that block the sensor are the first problems to look for if your door won t close or in extreme cases open at all.
These troubleshooting tips should work if nothing else is wrong with your garage door.
Try opening the garage door with the remote and see what happens.
Now press the remote control.
So there you have it.
The light will flash two times.
It s frustrating to have a garage door that won t stay closed.
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Depending on the model yours may also have a door sensor sometimes called a door edge sensor that stops and reverses the garage door when it encounters a person or object in its path.
Loosen the receiving eye wing nut and adjust sensor until it receives the sender s beam.
When the green indicator light glows steadily tighten the wing nut.
Adjusting the limit travel setting.
Whether you have a belt drive chain drive or wall mount model find helpful resources manuals videos and more to help you diagnose and fix the problem.