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My garage door has opened twice in the last 2 weeks during the night. Is someone driving by and opening it "accidentally"? How do I keep this from happening?

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in the mean time, 1) if you have a doorway from the garage, keep it locked; 2) some openers have a wall mounted control unit, and some of those control units have a tiny switch to disable the opener. If you disable the opener, or simply unplug the opener's power cord, make sure you know how to open the door manually in case of emergency such as fire. Also, unplugging or disabling the opener may make it possible to open the door manually (from outside), in which case it will need to be manually latched closed as well for security. –  mike Jul 15 '13 at 2:57
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Thanks Mike. I have all doors locked and garage doors latched with handle and spring lock mechanism. Will try to reset remote and code box. –  Nanny Jul 15 '13 at 4:28
    
good. It would be stating the obvious, but two other steps would be to google the model number. It's likely that the mfr put the owner's manual online, or that someone posted a scanned version. The other is to call customer service. Much depends on the age and model that you have. Sorry I can't be of more help. –  mike Jul 15 '13 at 5:03
    
Our prior house was built before the age of the rolling code openers, and we had the garage door opener circuit controlled by a switch inside the house, which we turned off at night and when away for more than a day. –  TomG Jul 15 '13 at 23:48
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3 Answers

If you have an older style garage door remote, before they used rolling codes, you could very easily have some people driving by activating it accidentally. I had a similar problem, so I ended up unplugging the remote control portion of it, so the wall mount switch still works, and the whole unit is going to be replaced soon anyways (electric eye sensor, etc).

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I would agree with Aaron. There are so many DIY projects for making a garage door opener that tests all possible codes in rapid succession. instructables.com/id/Garage-Door-Opener Some of them have been reduced to a mobile phone application that only requires a $5 device to be connected to the phone. Also, if all the homes in your neighborhood are about the same age, there's a good chance the same company setup the garage door systems for all the houses, and a common open code is probable. –  Dogbert Jul 15 '13 at 16:24
    
That instructables URL is interesting, but that particular one is just controlling the inside-the-house X10 setup to simulate a push on the button, not sending RF to the garage door opener –  Aaron Jul 15 '13 at 16:39
    
Agreed. There are at least 20 similar projects, some of which actually communicate with the external receiver. I just wanted to make a point, and draw attention to the existence of such DIY projects which, while academic in nature, are open to considerable abuse. –  Dogbert Jul 15 '13 at 16:43
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I have three Genie garage door openers. Two years after installation one started opening and closing on its own. I took the batteries out of the transmitters, shut off the switch on the door button, and reprogrammed the open/close limits. Nothing worked.

When checking the door button/wiring for a short, I found that one wire from the wall button connected to the back of the opener had worked loose and was just lying against the contact. I slid the wire back in and made sure it would not pull back out. End of problem!

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Are the openings related to any particular environmental conditions? I have an occasional false open when it gets very cold. I suspect that the safety mechanisms are triggering it (It also exhibits some other mis-triggers of the safeties), but I haven't proven that yet.

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