If you pull up to your garage as you normally do and press on your remote control garage door opener only to find that it suddenly won't work, the problem can be due to one of several issues. Some of the things you want to consider as possible problems can include –
Very hot or cold weather outside can keep your remote from working: If it's extremely hot or very cold outside and you try to use your remote to get the garage door to open, then you may find it won't work. To test whether or not the issue is weather related, you will want to take the remote in the house with you for a while so it can get to room temperature and then step back outside and give it a try. If it suddenly works, then you have easily found out the problem. Also, this lets you know that you'll want to try to take extra steps in the future to prevent the remote from getting too hot or cold again. One thing you may want to do is to keep it with you instead of leaving it in the car where it will be exposed to those extreme temperatures for long periods of time.
The battery may need to be replaced: It may be the batteries that is the problem. However, your garage door openers remote will normally give you a little warning before the batteries go out. You may find that you suddenly need to click it a few times and even get closer to the garage than you normally have to before it opens the garage door for you.
You may be too far away or the signal is blocked by something: Try clicking the remote from a closer distance than when you are on the street. Also, keep in mind that there may be something blocking the signal temporarily. However, if you continue needing to get closer and closer before the remote will open the garage door, then you should consider the aforementioned section regarding batteries going bad.
You may have a remote which has simply burned out: Just as with any other electrical device, it's also possible for your garage door openers remote to simply go bad. When this happens, it's generally easier to just replace the remote than to have it fixed. You don't necessarily need to turn to the actual manufacturer for a replacement remote, although this is an option. You can also opt to get a universal remote that can be programed to work with your system. Universal remotes are generally compatible with just about all garage door opener manufacturers.
The sensors may be dirty or misaligned: If you find you can't open or shut the garage door, it may actually be the sensors near the bottom of your garage door frame that are the problem. Make sure the 'eyes' are clean and that they are pointed directly at each other.
If you can't determine the problem then you may want to call out a garage door repair person, or even your local locksmith. They will be able to troubleshoot the problem for you and take care of it so you can once again open the door with the remote.