Door sensors do go bad so if no light is showing at all you may need to replace them.
How do i fix my garage door sensor.
Remove any debris dust or cobwebs from the electric eye lenses on each sensor with a clean rag.
Disconnect the emergency release cord.
Make sure that the antenna on the motor unit is hanging downward and is not damaged in any way.
Once your garage door is secure pull down on the manual release cord which should be red and located next to the garage door motor.
Proper height for a garage door sensor is 4 to 6 inches 10 2 to 15 2 cm.
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.
Move closer to the door.
Look for small led lights on the sensors.
This is a brief demonstration on how to adjust the safety sensors on your garage door.
To disable your garage door sensor first make sure your garage door is closed or propped up with 2 by 4s just in case it comes crashing down when it s put into manual mode.
If they re turned on in both the sensors then there is no issue with the power supply.
The sensors that make garage doors safer must be located in the worst possible place close to the floor.
Align or replace the safety sensor if the door goes up but goes down only when you hold down the wall switch check to see that the safety sensors are in alignment.
You will still be able to use the doors by manually opening or closing it.
If you have a laser level you can use it instead of a string to align your garage door.
It s possible you are out of range of the antenna inside the garage.
Simple but true the remote transmitter needs power to send a signal to your opener.
Sensor power reconnect the sensor to its power supply a common cause of a malfunctioning garage door sensor is lack of power supply.
If you have an automatic garage door then you have to disconnect the door sensors.
Cycle the garage door through the opening and closing actions using the control on the garage wall.
The small light on each sensor should be lit up when nothing is between them.
The first thing you need to do is stop the power supply for the garage door.