Look for small led lights on the sensors.
My garage door sensor is yellow.
If you do not see a solid illumination or your garage door is not working the problem is most likely due to the sensors being out of line.
Garage door sensor light is yellow not letting door shut.
Watch the sensors as the garage door operates.
If they both have lights on then continue.
Any flickering indicates alignment is needed.
You ll need to first equip yourself with a wrench of some sort and a tape measure.
The sending sensor is usually amber or red and the receiving sensor is usually green or yellow.
The light on the sending sensor should always be on even if the sensors are not aligned properly.
A common cause of a malfunctioning garage door sensor is lack of power supply.
If they re turned on in both the sensors then there is no issue with the power supply.
Open garage door then look at the safety sensors.
The garage door sensor yellow light and the green light together create a solid illumination.
Chamberlain liftmaster and sears craftsman garage door openers manufactured after 1997 will have an amber or yellow light on the sending safety sensor.
I reprogrammed my genie opener after that was done the door i reprogrammed my genie opener after that was done the door will only go down by holding the wall button down until the door is completely down.
Then take an object large enough to set between the 2 sensors and see what the sensors do one turns off.
Garage door sensor light is yellow not letting door shut.