You need to reactivate your sensor. The door should stay open and the motor unit lights should blink. It is very unlikely the remote is broken and if the door is completely unresponsive or hit-and-miss, the remote battery is the first thing to check. Our battery backup systems still operate with all safety and security features as if the power was on. If the garage door opener closes the door with the safety sensors blocked, replace the logic board. Remote Batteries Are Depleted. If your garage door opener remote has suddenly stopped signaling for your door to raise and lower, consider whether the batteries have died before calling your local garage door … Find the Garage Door Opener Battery backup that’s right for your home. LiftMaster’s Garage Door Openers Battery solutions ensure you can get in and out of your garage, even when the power is out. Open the garage door. To remove the old batteries, open the battery chamber and lift the old cells. 1. If your garage door opener operates via remote control, you can remove the old batteries by simply sliding the door located at the back of the remote control. Considering how simple it is to replace the battery, you should go ahead and do so before the garage door remote goes out completely. Do you remember the last time you replaced the batteries in your opener remote? The garage door safety sensors are designed to ensure maximum safety for your garage door opener operation. Place a box or similar object between the safety sensors to block the sensing beam. Most types of door openers have battery compartments located at the bottom part of the control box. The Genie garage door safety sensor kit (Safe-T-Beams) uses an invisible infrared beam across the opening of the door, the system detects any object passing through the infrared beam of light and automatically reverses the closing garage door. Attempt to close the garage door using a remote. To do this, open and close the window or door several times until you hear the keypad beep. However, if you’re changing batteries for a window or door sensor, you’re not finished quite yet. Most likely your garage door remote battery is on the way out. Typically, your keypad will beep three times when you open or close the window or door. The photo cells on a garage door opener will never affect the opening of your door in any manner whatsoever therefore if your door doesn't open it is not a problem with the photo-cell sensors.