According to liftmaster issues with the safety sensor wiring typically occur because of a poor connection incorrectly connected wires or a short in the wire from a staple.
Garage door opener sensor light not working.
Replacing your old sensors.
Genie garage door openers have a green light on the sending sensor.
Light bulb needs to be replaced in garage door opener.
Plug the opener back in.
The problem is either due to a blocked path between the sensors dirty eyes loose wires at the sensors or at the motor head or just bad sensors.
If the light is still not coming on it could be the light socket or the logic board.
Follow these easy steps there isn t a solid light coming from the safety eye sensors.
To determine which one it is follow the steps below.
Many times the malfunction can be due to a loose connection or broken wire.
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.
Sweep the garage floors and look through the sidings to ensure that there are no objects to obstruct the door.
Now that you have made sure there are no obstructions and that both sensors are aligned properly.
Check power supply to garage door opener.
It only comes on when the sending sensor is making the proper connection.
Cleaning and adjustment remove any debris dust or cobwebs from the electric eye lenses on each sensor with a clean rag.
Adjust each sensor in small.
When the infra red sensors are malfunctioning usually one of the sensor lights will be blinking.
If the sending sensor is not working properly the green light on the receiving sensor will remain off.
Loosen the small nuts that hold each sensor to the l brackets with a small adjustable wrench.
This light should always be on unless it is not getting power.
If it s the light socket or logic board.
Loosen the nuts just.
The sensors have to be aligned with each other and also have to be connected correctly to the garage door system in order to work.
The transmitters remotes will not work to close the garage door.
More and more products are being produced at a faster rate and that leads to reduced quality.
Liftmaster suggests them be placed no higher than 6.
Cycle the garage door.
Since the lack of power supply is a common problem check the wires around the sensor when the led lights are not flashing.
Unplug the garage door opener then immediately plug the opener back into the electrical outlet.