Home Improvement Questions? Ask a Handyman for Answers
Can you still open and close the door some other way, without the remote?
If the LiftMaster is still functional, then the remote may just need re-pairing with the system again.
To do this, press and release the Learn button on the LiftMaster, then within 30 seconds, press and hold the button on the remote for three seconds. The LED indicator light should turn off or the operator lights will blink indicating programming was completed successfully. Press the button on the remote again to test it. The opener should now work normally again.
The Learn button is located on the LiftMaster, usually near the pull-cord.