SOURCE: My garage door opener won't close the garage door.
Most likely your door sensors have been bumped and are not aligned properly. Make sure they are pointed at one another and the small light on each one is lit and not blinking.
SOURCE: Remote Control closes garage door but does not open
It sounds like a case of your keypad losing signal strength enough that it cannot transmit through the closed door. If a new battery doesn't do the job a new keypad will.
SOURCE: Garage Door will not stay closed.
You need to check the adjustment for the travel of the door ... All automatic closers have a built in safety mechanism that prevents children, pets and even yourself from being crushed by the door ... so if the travel is set to low the door will hit the ground too hard and safety mechanism will activate opening the door again! Look at you documentation for how to adjust this for your particular model :)
You cannot bypass the sensors but you can try reversing their position so that the sun isn't hitting the receiving unit. You can also move them back from the door or use something like the tube inside a roll of toilet tissue to shade the lens.
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