# My garage door opens or closes by itself. What's causing it? > Chamberlain says the usual causes are a stuck remote button, someone else's remote paired to your opener, or a shorted wall control. Here is how to check. Source: https://garagedoorscience.com/blog/garage-door-opens-or-closes-by-itself · by rick · published 2026-10-07 · updated 2026-10-07 Your garage door opened or closed when nobody pressed anything. [Chamberlain's support article on a door that activates on its own](https://support.chamberlaingroup.com/s/article/Garage-Door-Activates-On-Its-Own) says the usual causes are a remote with a stuck button, someone else's remote that got programmed to your opener by accident, or a short in the wall control, and it calls the problem rare. All three can be checked in order. That Chamberlain article covers Chamberlain and LiftMaster openers. If you have a Genie or another brand, the steps below show you what to look for, but your owner's manual is the place to check how your model does it. ## Start with the remotes A remote with a button jammed down keeps sending a signal, and the opener keeps answering it. [Chamberlain's article](https://support.chamberlaingroup.com/s/article/Garage-Door-Activates-On-Its-Own) says that if the light next to the Learn button on the motor unit flashes fast and does not stop, a remote is sending a constant signal. To find which one, Chamberlain's same article says to take the battery out of each remote in turn. When the flashing stops, the last remote you emptied is the one with the stuck button. Check the car visor, the junk drawer and the spare in the kitchen. A remote that has been sat on in a bag counts too. ## Erase and re-pair If no remote has a stuck button, the next suspect is a remote you do not know about, paired to your opener at some point. Clearing the opener's memory removes it. [Chamberlain's guide to erasing remote and keypad access](https://support.chamberlaingroup.com/s/article/How-To-Erase-Remote-Control-And-Keypad-Access) says to hold the Learn button until its light goes dark, which takes about six seconds, and that this wipes every code the opener had stored. Chamberlain's guide also says each remote and keypad you want to keep has to be programmed again afterwards. Gather them all before you start. [Our guide to programming a garage door remote](/blog/how-to-program-garage-door-remote) walks through that part. If the door then stays put for a few days, the problem was a remote. ## The wall control The wall button and its wire run back to the motor unit, and that wiring can short. Chamberlain's guide to [troubleshooting the door control on Security+ openers](https://support.chamberlaingroup.com/s/article/How-To-Troubleshoot-The-Door-Control-for-Security-Garage-Door-Openers) says excess wire touching the board "can cause a short on the circuit board". That guide's steps include checking for stray wire at the back terminals, and it says not to over-tighten the terminal screws. [Chamberlain's article on a door that activates on its own](https://support.chamberlaingroup.com/s/article/Garage-Door-Activates-On-Its-Own) has you detach the red and white wires at the back of the motor unit to take the wall control out of the circuit, and it warns: "do not disconnect the safety reversing sensor wires." Chamberlain's same article says that if the door still moves by itself with those wires off, the next step is replacing the receiver logic board. If it stops, Chamberlain's article has you narrow it down over several days to the wall control or the wire running to it. Read Chamberlain's article for your model before you touch anything. If you are not comfortable working at the motor unit on a ladder, ask a technician to do this part. ## What the LED can tell you The opener may already be telling you something. [Chamberlain's diagnostic codes page](https://support.chamberlaingroup.com/s/article/Diagnostic-codes-for-garage-door-openers-1484145692749) says a blinking light or arrows on the motor unit may be reporting a problem, and it points you to a chart for your specific model. Chamberlain's page says the model number is on the label on the motor unit. Write it down before you go looking, so you read the right chart. ## What a rolling code does and does not do Your opener may use a rolling code. [DASMA, the door and opener makers' trade group](https://www.dasma.com/safety-tips/garage-door-openers/), describes it this way: "the code changes after every use". That protects the signal, but it does not stop a remote that was properly paired to your opener, and it cannot stop a stuck button. Only erasing the memory removes a paired remote. DASMA's same page gives a plain rule worth following here: "keep the remote controls for your openers where children cannot play with them." A remote in a toy box or a backpack can open the door with nobody watching. ## What to put on a service call If a technician comes out, ask which of the three causes they ruled out, and ask them to write it down: a stuck remote button, a remote paired by accident, or a short in the wall control or its wire. If they recommend a new logic board or a new opener, the note shows what they checked first. [DASMA recommends](https://www.dasma.com/safety-tips/garage-door-openers/) that a trained door system technician install an opener, so a replacement is a job to hand over. ## What not to do Do not touch the springs, cables or bottom brackets on the door while you work on this. They hold the door's weight under tension and belong to a trained technician. If the door moves on its own while anyone is under it, keep everyone clear of the opening until you have found the cause. And when you work at the motor unit, leave the safety sensor wires connected, as Chamberlain's article warns. Chamberlain calls them the safety reversing sensors, and [our safety sensors page](/blog/garage-door-safety-sensors) explains how they work. ## What to do today 1. Look at the light next to the Learn button. If it flashes fast and steadily, pull the battery from each remote in turn until it stops. 2. If no remote is stuck, erase the opener's memory and program again only the remotes and keypads you keep. 3. If the door still moves by itself, read the Chamberlain article for your model, or your manual if it is another brand, and ask a technician to check the wall control and its wiring. If your remote has the opposite problem and does nothing at all, start with [our page on a garage door remote that is not working](/blog/garage-door-opener-remote-not-working).