Brianfrancis45

Thanks to all and especially to DCC .The problem has now been solved. I asked auto electrician this morning if the coding he had entered was the same as the one given above by DCC . It was very similar but if I remember correctly was out by one digit - I think it had a  ''4'' in place of the ''6'' in DCC's coding. I asked him to enter the coding supplied by DCC which he did and  still no sound ,so as advised by DCC I then asked  him to reboot the system which he did and hey presto everything worked perfectly.
The auto elec then deleted DCC's coding and re-entered the coding he originally had put in ( he said he was doing this to be on the safe side as it was the coding that worked with the Columbus unit which I was replacing  ) , did a reboot and all was OK. He said that yesterday he had forgotten to do a reboot of the system and this is why it didn't work then.  Thanks again for your assistance which is greatly appreciated.