There are multiple reasons they can stop working.
Remote control garage door opener doesn t work.
Simple but true the remote transmitter needs power to send a signal to your opener.
If pressing the button on your garage door s remote control doesn t work check the batteries first.
Dirty worn or wet contacts inside of the battery case inhibit the electrical current.
Other issues could be a bad battery or even an led bulb causing.
Quickly test the quality of your opener s wiring by following these steps.
When i returned from work today i pushed the button on my remote garage door opener but the door didn t budge.
When the garage door doesn t budge at all when the remote or wall switch pressed it s almost certain the power source has been disrupted in some way.
Reprogram the remote if the remote has a row of small switches inside example make sure the position of the switches match the position of the switches on the back of the garage door opener.
The batteries in the remote are brand new and the door still won t open.
If the remote is set to the correct frequency then this may not be a remote problem but rather a problem with the garage opener itself.
Check to be sure the antenna is attached and if it is not hanging down from the unit move the antenna so it can catch the beam being sent by the remote please note that the antenna on some garage door openers.
Even after putting new batteries in the remote the garage door still is not.
The easiest and first step i suggest is trying to sync your remote again.
How to fix a garage door opener remote that has stopped working check the batteries.
Check to make sure that the opener is plugged in and that no fuses are blown or circuit breakers tripped.
If that doesn t work try rebooting the unit by unplugging the opener and then plugging it back in.
As with many such problems the most common problem is the simplest one the motor unit has been unplugged.
If the remote works from inside the garage but not from the outside then most likely the antenna wire on the garage door opener itself may be damaged broken or not in visible range.
Check the battery contacts.