You can use the recorder remote with up to three different Panasonic DVD recorders in the room [where you set each remote to a different 'channel', 1, 2, or 3 - otherwise by default they are all set to 1 and then all three Panasonic DVD recorder/players would respond to every remote command from every remote control. See page 15 of the user guide to see how to program/unprogram the remotes & players to do this [you can download the manual as a pdf from Panasonic.co.uk via the internet if you have lost your paper copy]. If this is your problem you will see the likes of 'Remote DVD3' flash up on the DVD display when using the remote - which your DVD recorder may or may not respond to depending if it's set to 1, 2, or 3.
keith, thank you for the post. you saved my evening after my son decided to play with remote control and dvd3 appeared on the display. that was simple to reprogram remote control, but without your post i wouldnt have even guesses that was the problem.