Garage door safety sensor Wiring

Warning please read the following before attempting to change your garage door sensors. 

Garage door sensors are designed for safety, before there were sensors around people, cats and cars could get damaged by there garage door. Making sure that your sensors are properly installed is important, typically they are placed approximately 1 foot of the ground.

Below is a picture of standard lift master garage door safety sensors they can easily be installed by cutting the wire from your old lift master sensor and matching up the wires black to black and white to white.

however let's go through the instructions step by step.

Step 1  Unplug opener, and remove old safety sensor wiring. You can easily remove the wires from the motor head by depressing the plastic piece above them and pulling the wire. Dismount the old garage door sensors.

Note: be mindful of the way the wires were connected so you no how to wire it back.

Step2  mount the new garage door sensors  in a way such that they are pointing at each other, tighten the thumbscrew.

Step3  Staple wires neatly (with rounded staples not flat ones) so the wires do not touch any part of the moving garage door system. Be careful not to staple wire this will cause sensor not to work. finally, reconnect wires the same way that you removed them.

Genie garage door sensor

The genie sensor is the same install as the lift master with an exception for the wiring... If you look how your old wiring is and follow it you should have no problem.. You will notice the wire goes from one sensor to the other and then to the motor head. The wires are color coded so just put the like colors together and you will do great!

Note: After plugging in your opener your sensors should have two solid lights if not then they are either wired wrong or you stapled the wires... in any case make sure you look at the current wiring ... which should be series for genie garage door sensors or parallel for lift master garage door safety sensors.

 FAQ:

Q: I changed my garage door safety sensor and my door still will not go down.

A: when your garage door sensors wiring is installed correctly you should have a solid light on each for models with two sensors and a solid light on models with one sensor. Check that the sensors are properly aligned and that there is nothing blocking them. Also make sure you are careful not to staple the wire when you install the sensors. Your safety sensors are designed with a normally open circuit so a staple will easily close the circuit.