Oftentimes when your garage door opener remote stops working it is because the remote transmitter has lost its signal with the motor.
Garage door opener signal weak.
If you watch that little light while you push the button on your remote you will see it flash.
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.
If the bad opener suddenly has good range again then the other unit in your garage is causing rf interference.
Make sure that the antenna on the motor unit is hanging downward and is not damaged in any way.
Multiple garage door opener troubleshooting test start by unplugging the opener that has good range powering down this unit.
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.
It flashes because it s hearing the radio signal from your transmitter remote.
Before installing the extension kit move any metallic objects that may obstruct the signal between the remote control.
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.
The remotes work by electronically sending a signal to the motor inside your garage allowing you to open and close the door.
Clip the remote control onto a sun visor in the vehicle instead of a metal ash tray or metal dash board that can.
Test the opener that has the poor range.