Since the lack of power supply is a common problem check the wires around the sensor when the led lights are not flashing.
No power at fotocell garage door.
Disconnect the power to the garage door.
Sweep the garage floors and look through the sidings to ensure that there are no objects to obstruct the door.
Once the power comes back on you must reconnect the garage door opener in order to take full.
2 the glass fuse on the circuit board has blown or popped.
Here is what may cause your garage door opener to not power on.
1 the transformer has failed due to a power surge.
Disconnect the emergency release cord.
Many times the malfunction can be due to a loose connection or broken wire.
Also how to manually close and disconnect.
Flip the circuit that controls the power to the garage door or disconnect the garage door plug from the wall.
During a power outage the garage door must be manually opened and closed in order to get in and out of this area of your home.
By using the emergency release cord you are able to open the trolley and shut down the electric garage door opener.
Look for obstructions adjust the sensors to get a solid green light.
You will still be able to use the doors by manually opening or closing it.