The limit screws might need to be adjusted if your garage door won't close all the way. The screws have contacts that let the garage door opener know how far to open or close. A garage door refusing to close may be 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 one of the common issues.
It goes back up if it closes before the set distance is met because it could have detected something. Your garage door components can change due to weather changes. The issue can be fixed by adjusting the travel down setting. 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 the most common scenario. The door opener interprets the beam being cut off as an object in the way of the door's descent, when the two sensor housings are out of alignment.
The limit switch requires only a flathead screwdriver if your garage door isn't staying open or closed. LiftMaster has a resource that explains how to adjust a limit switch.
Pressure and wear and tear can cause door tracks to be out of alignment. If your garage door isn't working, you should always call a service to get 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 minor problem but a common reason your garage door won't open often.
Garbage cans, shovels, and even mice can cause damage to the wiring. Since the wiring is low voltage, any small electrical signal can cause the opener to open. The opener's logic board or the motor unit itself could be to blame when the door begins to descend on its own. Like your travel down setting, your garage door opener's limit switch governs where your garage door stops when raised or lowered.
The garage door remote can be replaced if it doesn't work. An electrical surge can cause the breaker to trip. If the breaker that powers your garage isn't in the "On" position, you should check your home's breaker panel.
Check the wall panel near the entrance of your home to make sure that it has been corrected. The open and closed limit settings are what garage doors have. When your garage door is completely open and when it is completely closed, these settings tell you how far up the track to go. The garage door stops when it reaches the limit. You may have to adjust your closed limit settings if your garage door keeps opening by itself after you closed it. The opener will mistake the ground for obstruction if the settings are too high, because they will think that a door has closed early.