Squealing, screeching, or grinding noises from your garage door are usually indicative of a lack of lubricant or an accumulation of dirt or debris in the tracks. When removing debris, do not use harsh chemicals to clean the tracks. Once the track is clean, coat it with lubricant designed especially for garage doors, if possible. If you do not have access to this special type of lubricant, you can use WD-40 on the tracks and hardware.
If the light attached to the door opener mechanism blinks several times after the door reopens, this generally means something is blocking the sensors or that they've become misaligned. The two sensors are generally clipped onto the door track about six inches from the floor. You can move them slightly with your hands to try to get them lined up. Other possibilities include a broken cable that must be replaced, a track that is bent and needs to be replaced or a worn extension spring cable pulley that needs to be replaced.
Should an object or individual become trapped, or if a malfunction occurs, pulling on the handle will allow the user to manually lift the door up or down. If a garage door is good working order, the spring system that runs across the top of the door opening should provide enough assistance so an average adult can lift the door with relatively little effort.
Torsion springs have three advantages over extension springs: They’re quieter, safer and easier to fine-tune. Torsion springs are quieter because you don’t have a spring knocking against a roller track. They’re safer because when a spring breaks, it usually stays on the bar. Finally, you can fine-tune the tension on a torsion spring so the door is perfectly balanced. Setting the tension on torsion springs has always been very dangerous, but torsion and extension spring systems with easy, do-it-yourself tensioning (Photo 7) are available. If you don’t use one of these DIY-friendly, easy tensioning systems (Clopay EZ-Set Spring and Wayne-Dalton TorqueMaster are two brands), you should hire a professional to release and set the tension on a torsion spring.