Maintaining and Troubleshooting an Infrared Opener Garage Door Infrared sensors are one of the modern garage door convenience developed today. This sensor keeps the door from closing in on an incoming car when the beam of light is broken, ensuring the prevention of dents and other damages on our vehicles. However faulty sensors may keep the garage door from closing properly when using a garage door opener. Troubleshooting and identifying the problems in the garage door and the infrared sensor must e done first before any garage door repair is to take place or calling in for a Garage Door Repair Woburn service. Alignment of the sensors should be checked if it is perfect, for mismatches may cause vibrations during operation, triggering a momentary break and forcing the door to go back up. Also do checks to insure that the wires behind the sensors are in good condition. Problems could also be caused by broken garage door springs or cables, and lastly, making sure that the lenses are clean and free of debris, for a dirty lenses may hinder the infrared sensors from working properly.