From the manual(abridged)...Press the setup key and the TV key together.Indicator lights will turn on.
Press three digit code for your TV.
If LED turns off code has been accepted.
If LED still on code is wrong so start again.
Press any key to exit setting mode and repeat
GRUNDIG codes are:003,044,010,052,024,065,008,050,020,055
033,091,043,049,018,053,026,077,007
Hope It's one of the first ones!
Bruce
April 2008