Slowly rotate sensor back aligning sensor with sending sensor until it lights up green again.
How to get your garage door sensors aligned.
This explains that the door sensors need to be in perfect alignment in order to work.
You will see a steady glowing light on each of the sensors.
An easy way to tell if your garage door sensors are out of alignment is by checking if the exterior led light blinks when you attempt to close the door.
If you are unable to get the door closed and the safety sensors are the issue the garage door can be closed by pressing and holding the push button on the wall until down travel is completed.
Testing your garage door sensors.
As you can see adjusting the alignment is actually a lot simpler than you d think.
Match like colors to like colors there are usually a black wire and a white wire.
The information provide by aashe is very good.
Evaluate the situation and perform one more test of the door.
Green lights mean the sensors are working while red lights indicate the sensors are not aligned.
The sensors are now aligned properly.
Connect these wires to the wiring of the new sensors.
I would suggest that you begin by replacing the sensors.
When you have a strong green light put it back into the bracket and put the wing nut back on.
Proper height for a garage door sensor is 4 to 6 inches 10 2 to 15 2 cm.
The latest garage door sensors are technologically advanced and even allow you to control the opening and closing through an app on your smartphone.
So here is the step by step guide on how to fix a garage door sensor.
Take the string off the mounting brackets and turn the power back on to your garage door.
For instance try using the wall switch instead of the remote.
If one of the lights is off they will not allow the door to close.
Follow these steps carefully and you shouldn t have a problem.
Sometimes the sensor may be beyond repair due to wear and tear and in such a case your best bet is to replace the garage door sensor with a new one.
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.
Attach the wires of the new sensors to your garage door system now that you have your hanging wires use your pliers to strip some of the casing back and expose the wires.