After pressing the learn button, go through the same programming method using the second button. This process will not over write the first button.
The codes cannot be erased, only overwritten. A newly programmed code will take the place of a previous code.
The LED is also a power indicator, pressing a button on the remote should cause the LED to illuminate. If the LED does not illuminate after you press the button, replace with a 3V lithium battery, CR2032.
If one remote control button is operating two doors, you must clear the memory of the garage door opener that you do not want the button to activate.
The learn button can either be found on the garage door opener or on an external receiver. To locate the receiver look for an antenna, some receivers will require a cover be removed to gain access to the learn button.
Visit the online manual for images of where to find your learn button.
The remote control can transmit on 310MHz, 315MHz, 318MHz, 390MHz and 372.5MHz radio frequencies.
Check the Compatibility Matrix
No, the remote control should retain it's memory. If it does not, you will need to reprogram it.
Most gate operators have a built in radio receiver or an external receiver. The receiver on a gate opener can usually be found within the cabinet of the operator. If it's a community gate, you may require permission to gain access.

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