(Chamberlain 1/2 hp Whisper Drive garage door opener) the garage mounted opener will open the door, but none of the remotes now work. batteries have been changed already. Is there a way to reprogram the remotes? Bought the house resale so don't have the original manuals.

If the wall button will operate the door up but none of the devices do then look at the wall button. Find the lock button and push it for 2 seconds and then try the remotes again. This is your vacation lock. You can get a manual at chamberlain.com. Now if the door does not open or close with the remotes you can reprogram them. Press the colored learn button on the motor head and then press the button on the remote. Repeat for each remote. If they fail to program you will need a new logic board. Thanks BB

Where is the serial number located on Chamberlain 1/2hp garage door opener,,mine just quit working,,no power ..