The garage door works when it wants to.

garage door safety beam YouTube

Try the programation with the central control of de wall
hold light boton then press de open botton (dont un unpress the light botton. Then put the control about 2 inch of the main control until its open or close the garage door.

Let me now if it work.

regards

That button on the wall is called a wall control. If you have a wall control with 3 buttons and the light in the control is flashing you need to press the lock button and hold for 3 seconds. Make sure the battery in your remote is good.

Make sure the light in the wall control is not blinking. If it is press and hold the lock button on the wall control for 3 seconds.

Press and hold for 3 seconds the lock button on the wall control.

Sounds like you have a couple problems. First of all press and hold the button on the wall control that has a lock icon for 3 seconds and release. This should take care of the flashing LED and the remotes will now work. Having to hold the button on the wall control until the door is closed is usually a problem with the door sensors. Make sure they are pointed at one another and the small light on each is lit and not flickering.

Press and hold for 3 seconds the button on the wall control with the lock icon.

If the small light in your wall control is blinking it is in the lock mode. Press and hold for 3 seconds the button with the icon of a lock. This will toggle the lock function off.

It sounds like you have the lock enguaged. When it is flashing it locks out all remote access. Hold the lock button for 3 seconds. The green light should go solid. On the issue of closing, it is most likely a safety eye issue. Hold down the wall button. If it closes it is the safety eyes. Holding the button overrides the safety eyes. Make sure that thelight on both eyes are both lit.

HOLDING DOWN THE WALL BUTTON OVERRIDES THE SAFETY EYES.
WHEN HOLDING IT DOWN MAKES THE DOOR CLOSE PROPERLY THE PROBLEM IS IN THE SAFETY EYES.

ARE BOTH LEDS ON? - CHECK FOR A LOOSE OR BROKEN WIRE.
ARE THE EYES WIRED CORRECTLY?
ARE THEY AIMED AT EACH OTHER?

YOU CAN GET THE FULL INSTRUCTIONS AT LIFTMASTER.COM
THE MODEL # WILL BE DIFFERENT BUT THE INSTRUCTIONS ARE THE SAME LOOK AT THE MANUAL FOR MODEL 3280

HOPE THIS HELPS