This sounds like a problem with the safety sensors; either due to a blocked path between the safety sensors, condensation, mis-alignment, dirty eyes, loose wires at the sensors or at the motor head, or just bad safety sensors. When the infra-red safety sensors are malfunctioning, usually one of the sensor lights will be blinking or a blinking red light will show rather than green or amber. The sensor lights need to be solid and not dim or flickering.
When the sensors are at fault, the remotes cannot close the garage door; they can only open it. You may find that the door will only move an inch or so in the close direction. When this happens, your garage door will only close by holding down on the wall button until the door fully closes. This method is the only way to override the safety sensors and close the door. This is also a direct clue that the safety sensors are the problem.
Also, try unplugging the garage door opener and re-plugging the unit back into the outlet. This can act as a reset and may reset the sensors. If none of this works then you may have to replace the sensors or possibly the logic board inside the motor unit.
SOURCE: how do you bypass sensors for craftsman garage door opener
The sensors are safety features so the door won't close on someone. When you hold the wall button down it's over riding the sensors, therefore it works when you hold down the button but will not work when you tap it or use the remote. Line up the photo cells so they stop blinking. If they're blinking they think something is in the way...hence not closing. If you can't get them to line up and stop blinking one may be defective. Contact the manufacturer and see if you can purchase a replacement set. They usually aren't too expensive, maybe $20/$40.
SOURCE: Garage Door Wont Close Craftsman 1/2 HP (1998)
What it is is the electric beams at the door are getting blinded buy the sun or out of line. They are the two black boxes on both sides of the door about a foot from the ground. Put a piece of card board in front of them not blocking the beam dut to block the sun. All that they are is safety beams for kids so they do not get hurt. If you have to move them to the top where the sun will not hit them. Sorry to say though you can not remove them all the way. Also make sure the lite on them is not blinking if so they are out of line.
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SOURCE: Garage door will not shut using remotes. It will
Make sure the door sensors are pointed at one another and both lights are on and not blinking. Tweak them just a bit to make sure.
SOURCE: Liftmaster 971LM opens but won't close correctly
Check the wiring going to the sensors to make sure it is not broken or disconnected. You have a problem with the sensors themselves or the logic board. Unfortunately the only way to be sure is to replace.
SOURCE: Liftmaster 1/2 horse Model HBW0777 acts like the
If the main light flashes 10 times when the door reverses it is a door sensor problem. Look closely at the green lights to make sure one isn't flickering ever so slightly. Tweak them a bit.
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