One Garage Door Sensor Is Red And One Is Green . There usually is a light on each sensor. Garage door sensors work using an infrared beam of light.
How To Align Garage Door Sensors 9 Steps With Pictures from www.wikihow.com Not all sensors have different color lights. My garage door will not go down using my transmitters. There usually is a light on each sensor.
The light is emitted from one side of the garage door to a receiving unit on the other side if the sensors are thrown out of alignment, then the red light will blink.
The sensors have to see each other. There usually is a light on each sensor. Garage door sensors work using an infrared beam of light. A sensor is basically an electronic beam of light that sees things in its path and when.
