If they re turned on in both the sensors then there is no issue with the power supply.
My garage door sensor is yellow.
Watch the sensors as the garage door operates.
If you find the lights turned off in one or both the sensors it indicates that there is a problem in power supply.
Open garage door then look at the safety sensors.
Garage door sensor light is yellow not letting door shut.
The light on the sending sensor should always be on even if the sensors are not aligned properly.
The sending sensor is usually amber or red and the receiving sensor is usually green or yellow.
A common cause of a malfunctioning garage door sensor is lack of power supply.
So how do you fix this issue.
The garage door sensor yellow light and the green light together create a solid illumination.
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.
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.
Then take an object large enough to set between the 2 sensors and see what the sensors do one turns off.
Chamberlain liftmaster and sears craftsman garage door openers manufactured after 1997 will have an amber or yellow light on the sending safety sensor.
Remember that the light on both sensors must be lit up solid they can be green amber or red.
Any flickering indicates alignment is needed.
If they both have lights on then continue.