Hi all, Sorry to reopen this but trying to work out what to do next. I sent my decoder back to Hornby as advised and they have tested it, say it works fine and have returned it to me. So far, so good. Very grateful for them testing it for me. I then followed the advice above and tested it on a DCC ready loco with an 8-pin socket (Hornby 153 DMU) to see if I could get it to operate on address 03. No response. The 153 works fine with the usual decoder plugged back in. Again, my DCC controller is the Bachmann EZ which I know is basic, but should it operate these new chips? I am happy to admit defeat but would be uncomfortable (for example) selling the decoder on because I simply can't get it to operate for me. Any thoughts about what I should do next? Thanks for all the help on this - massively appreciated! Phil (Will is a pseudonym!)