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.
Garage door remote signal weak.
If your remote works correctly check that the opener s antennae doesn t have any excess debris buildup is pointed toward the door and isn t broken.
If the bad opener suddenly has good range again then the other unit in your garage is causing rf interference.
If you watch that little light while you push the button on your remote you will see it flash.
Multiple garage door opener troubleshooting test start by unplugging the opener that has good range powering down this unit.
Press the learn button on your garage door motor to reset the current codes and transmitters and wait for the red indicator light to begin blinking.
The button is near the antenna wire on the back of the system.
Test the opener that has the poor range.
Before installing the extension kit move any metallic objects that may obstruct the signal between the remote control.
Step 2 press the open button on your remote transmitter three times while inside of your garage and pointed at the motor.