Please note there have been a many versions of the LW550 control board over the years. Make sure your remote matches with the control board shown in the image below.
Troubleshooting your remote
Do any other remotes work? if yes and it is only the one remote not working, try changing the battery. If it still doesn't working and the light on the remote comes on, you can try re tuning to the main control board. If it still doesn't work then you will need a new remote.
