Iovox CD 80 button 4 failed so can't complete code

[JohnnyBG]

Hi'

It's in the title really.

Just this morning when I started up the radio asked for code, no problem, I have it! I remember it as well as having it written down as every time I play a CD afterwards it asks for the code to get the radio to work.

Did the first three digits using the 1, 2 and 3 buttons. When I press button 4 to cycle through to the right number, nothing happens, it just stays on zero. So although I know the code, I can't enter it.

Help welcomed.

JohnnyBG