It goes back up if it closes before the set distance is met because it could have detected something. Due to weather changes, your garage door components may change. The travel down setting can be adjusted to fix the issue. Residential electric garage door openers manufactured after 1993 have two safety mechanisms that operate when the door is closing. Since that date, all garage door openers include 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 trolley is a mechanism used to connect the garage door to the opener. The trolley might be in bypass mode if your garage door is moving by hand. Pull the rope toward the door to remove the trolley latch. The trolley will come back onto the chain once you open the garage door.
The garage door's weight is offset by the springs of the door. Automatic and manual garage door systems have these springs. Two springs run over the width of the door, while two extension springs lift and lower the door on the track.
It can be caused by pressure and wear and tear. If your garage door isn't working, call a service to have the tracks replaced. The shut reverse, where the door closes and then comes back up, is a wackier malfunction. Problems like this are often the fault of 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 is because the batteries have died.
Garbage cans, shovels and even mice can damage wiring close to the photo eyes. 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 door stops when raised or lowered.
The door can either be stopped or reversed if there is an object detected. The photo eye is used to make sure the door doesn't close on objects or people. It's time to call a garage door repairman if the above remedies didn't fix the door. Check the overhead track coming from the garage door opener. There might be an obstruction in the path of your garage door.
You might need to adjust the limit screws if the garage door won't close all the way. It's easy to adjust the screws that tell the garage door opener how far to open or close. It is 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. When it isn't one of the common issues, it's probably time to call in the professionals.