The garage door's weight is offset by the springs of the door. Both automatic and manual garage door systems feature these springs. Two springs run over the width of the door, while two extension springs lift and lower the door.
If it closes before the set distance is met, it may have detected something, so it goes back up. Your garage door components may change due to weather changes. The travel down setting can be changed to fix the issue. Residential electric garage door openers made after 1993 have two safety mechanisms that operate when the door is closing. Since that date, all garage door openers have door sensors that prevent the door from closing until all obstructions are out of the way. A misalignment of the photoelectric reversal system is one of the most common scenarios. The door opener interprets as an object in the way of the door's descent if the two sensor housings are out of alignment.
You might need to adjust the limit screws if the garage door won't close all the way. The contacts on these screws tell the garage door opener how far to open or close. It's possible that a garage door refusing to close is a bigger issue than just fixing the sensor, cleaning the tracks, or resetting the travel/limit setting. It is probably time to call in the professionals when it is not a common issue.
Pressure and wear and tear can cause door tracks to be out of alignment. If your garage door is malfunctioning, call a service to have the tracks replaced. The shut reverse, where the door closes and then comes back up, is a wackier malfunction that happens with some doors. Problems like this are caused by a misadjusted limit setting on the opener. A dead transmitter remote is a small problem, but a common reason your garage door won't open often is that the batteries have died.
The limit switch needs only a flathead screwdriver if your garage door isn't staying open or closed. LiftMaster has a helpful resource that explains how to adjust a limit switch.
Garbage cans, shovels, and even mice can damage wiring close to the photo eyes. Since the wiring is low voltage, a small electrical signal can cause the opener to run. When the door begins to descend on its own, the opener's logic board or the motor unit may be to blame. Like your travel down setting, your garage door opener's limit switch governs where your garage door stops.
The door can either be stopped or reversed if an object is detected. The photo eye is used to make sure the door doesn't close on objects or people. It is time to call a garage door repairman if the remedies did not fix the door. Check the overhead track coming from the garage door opener. There could be an obstruction in your garage door's path.
