One sends a beam of infra red light to the other.
Garage door opens but does not close with remote.
This is the reason the garage door remote can open the door but may not be able to close the garage door.
If anything interrupts this beam of light the garage door will not close and the ceiling light on the opener mechanism will flash as mentioned in the previous step.
Some garage doors have infrared sensors that shoot an invisible beam across the door.
This is one of the sensors.
Check the area around the sensors to make sure nothing is blocking the sensor.
Try resetting the remote.
To test trigger the remote while standing close to the motor unit if the door opens consistently from that close distance interference is likely the problem.
If they are working correctly the problem might be because of the safety sensors.
My garage door will open but not close with remote posted on may 16 2020 by bandi ruma garage door openers top 10 reasons your garage door won t garage door is opening by itself garage door won t open.
The garage door remote won t work but the wall switch does check the batteries and electrical connections in the remote to make sure they are working correctly.