Lenz compact and programing

[ChrisWaring]

Hi

I have just received a 70 ton climax with sound (very nice by the way) and am running it with my Lenz compact DCC controller. The locomotive runs fine with this controller but i am having trouble changing the address on the programing track. i just get a message cannot read CV. the locomotive makes a clicking noise as well. the Lenz compact i am using is about 10 years old and i do remember some time ago reading that this unit could not change CV's on all decoders. Is this problem due to something i am doing wrong or is the Lenz compact just not up to the job?

Thanks for reading

Chris.