How To Install a New Garage Door Sensor

Chances are your last garage door failed to stay closed, which now brings you to the point where you will have to install a new garage door sensor.

Don't worry, it's not hard to complete and it should only takes about 30 minutes from start to finish.

First you will need to gather up some basic tools. You will need:

  • New garage door sensors
  • Screwdriver or socket wrench
  • String

Once you have the tools in hand you can start with the first step.

  1. The first step for installing new garage door sensors would be to shut the power to the garage door. This is a very important step and should be done before any work begins on the door. Failure to complete this step is jeopardizing your safety. Garage doors can sometimes weigh as much as 400 pounds. They have been known to injure and have killed a few people. So be very careful.
  2. Secondly, you will need to disconnect the wiring from the sensors and unscrew any bolts or screws that are holding the sensors in place.
  3. Next, you will need to install the sensors in the exact place as the ones you just removed. This is very important, because the sensors have to be aligned for them to work properly. If the sensors are not aligned the door will not close and will be cause for you to have another go at it.
  4. Once, the sensor is screwed tightly into place. You should use the string and drape it from one sensor to the other one. Make sure the string is tightly secured. This is done to make sure the sensors are aligned. If you notice any errors, make sure to correct them and readjust the sensor that is off.

After the screws are safely secured into place, you can remove the string. You can now turn the power back on to the garage and begin to test your installation. You should first raise the garage up, and then press the button for it to go down, but before it gets completely down, you should wave your hand in front of the sensor only. Be sure to stay away from the door itself. If the garage stops and immediately starts to go back up, then you know that you have installed the sensor correctly. If the garage continues to go down, then retry the string test and makes sure you have the sensors aligned with each other.


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