If one or both of the lights are off check the fuses breakers and plugs for problems.
How to fix garage door sensor lights.
Sensor power reconnect the sensor to its power supply a common cause of a malfunctioning garage door sensor is lack of power supply.
Once the wing nuts are loosened disconnect the sensors and take them off.
Raise the garage door using the control button on the garage wall or the remote control unit from a vehicle.
If both the red source and green sensor lights are on and not blinking then the door mechanism is working properly.
If you have a laser level you can use it instead of a string to align your garage door.
To change your sensors.
A simple way to do this is to unplug the garage door opener and then plug in another device say your phone or a light bulb to see if it lights up.
Look for small led lights on the sensors.
Start by unplugging your garage door opener.
Inspect each sensor to make sure the green or red power indicator lights are.
Take your wrench and loosen the wing nuts on both of the sensors.
When your garage door opener is not responding to any command from the remote or the door control you need to check if the opener has electricity.
If they re turned on in both the sensors then there is no issue with the power supply.
Move the sensors into the garage and out of the sun switch sides the sides of the sensors putting cardboard like a toilet paper tube around the sensor will block much of the sunlight.
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Proper height for a garage door sensor is 4 to 6 inches 10 2 to 15 2 cm.