As with many such problems the most common problem is the simplest one the motor unit has been unplugged.
Garage door intermittenly working.
Depending on the brand.
First check to see if the transmitter on the wall inside your garage still opens your garage door when pressed.
If the batteries in your transmitter are dead the transmitter won t be able to send a signal to your garage door to open.
If your garage door opener uses a keypad and that keypad stops working then there are a few things you can do to get it functioning again.
Locate and eliminate the source of the rf interference.
This may sound obvious but your garage door transmitters need power to work.
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.
Clutter or obstructions that block the sensor are the first problems to look for if your door won t close or in extreme cases open at all.
The solutions firstly check that you re using it within the range required for your opener.