radio/cd, Vauxhall Zafira, CD30?

Just purchased a used Zafira 07 model, it is fitted with a CD30 radio/cd which does not seem to be the correct model for the car. It plays sometimes but mostly will not play and shows radio safe on the screen. Have tried holding down the AS button when switching the unit on with no result. Any suggestions. Many Thanks

Jim
January 2011