I have a 1.5 dci Dynamic '57 plate and so no 6 disc CD player.
I purchased a second hand player which apparently was all working. I fitted it into the car with the lead to connect it to the radio, put the code in and there was life!

I put the radio and CD player back into the dash and then tried to insert a CD but it just would not let me put it in. It comes up Error CD but it just won't let me put a CD in.

I disconnected it all and then reconnected it, just to make sure all was correct

Still no good

Any ideas or suggestions?