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.
How to fix garage door sensor lights.
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.
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.
If they re turned on in both the sensors then there is no issue with the power supply.
Once the wing nuts are loosened disconnect the sensors and take them off.
Sensor power reconnect the sensor to its power supply a common cause of a malfunctioning garage door sensor is lack of power supply.
Raise the garage door using the control button on the garage wall or the remote control unit from a vehicle.
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Inspect each sensor to make sure the green or red power indicator lights are.
But avoid blocking the actual sensor part with it.
If one or both of the lights are off check the fuses breakers and plugs for problems.
To change your sensors.
Check the mechanism s source and sensor leds.
In this case you will set up the level aligned with one sensor then adjust the opposite sensor until the beam of your laser level is hitting the sensor.
Take your wrench and loosen the wing nuts on both of the sensors.
Look for small led lights on the sensors.
Start by unplugging your garage door opener.