It s possible you are out of range of the antenna inside the garage.
Garage door opener weak signal.
To isolate potential sources of interference turn the circuit breaker off to the garage and plug the garage door opener into an extension cord from another room.
Modern garage door openers are essentially small radios that operate at about 315mh and a few feet of extra distance can affect the signal.
It flashes because it s hearing the radio signal from your transmitter remote.
Troubleshooting a lost signal on your remote is as easy as resetting the old signal on the motor opener and equipping your transmitters with new signals.
Any electrical device can be the source of the problem.
If the range improves then the interference is coming from a device in the garage.
The remote control unit for a garage door opener works by transmitting a radio signal to the unit inside the garage.
Major brand names like chamberlain liftmaster craftsman and genie have come out with light bulb recommendations.
The remotes work by electronically sending a signal to the motor inside your garage allowing you to open and close the door.
Oftentimes when your garage door opener remote stops working it is because the remote transmitter has lost its signal with the motor.
On most of the newer garage door openers there is a little led light next to the learn button on the back of the opener.
Move closer to the door.
If you watch that little light while you push the button on your remote you will see it flash.
Make sure that the antenna on the motor unit is hanging downward and is not damaged in any way.