Q: Can I replace only one sensor on my garage door opener?
A: (safety sensors: sensors located at the bottom corners of door that keep door from closing when door opening is obstructed.) Safety sensors have 2 sensors pointed at each other. One is a transmitting sensor the other is a receiving sensor. Usually each sensor has different color LED lights one green and one red. These LED lights indicate if sensor is working properly.
When one sensor has broken or stopped working and the other is still ok, you can just replace the sensor that has stopped working. Now sensors are sold to garage door companies in pairs. They don’t sell them individually. So replacing both sensors is the best way to go.
When sensors LED lights blink they are letting you know something is wrong. I have found on Genie brand openers that don’t assume the sensor that is blinking is the one that has malfunction. I have replaced just the one sensor that was blinking and found the bad sensor was the other one.
Always replace both sensors because it eliminates having a malfunction with a sensor that you did not replace. And since they are sold as a pair it just makes more sense. Replacing sensors is an easy process and should only take 20 to 30 minutes in most cases.