ZTC 4007 Diamond decoder

I assume you have had this loco on the programming track and tried to read a few CV's. If you haven't get into the habit of testing your installations before plonking them on the main line.
Although ZTC don't advocate the removal of capacitors you could try this route: I see you have a plug-in decoder the chances are you haven't tried this route yet.
Perhaps first try phoning ZTC Tel: +44 (0)870 241 8730 ask them why their decoder isn't working as it should.

What system are you using ? why did you choose this decoder ? Do you have other loco's that run normally ?

QUOTE NEW 4007 Diamond Decoder for use with all NMRA DCC Ready Locomotives
This new NMRA compliant Decoder is suitable for all 00/HO DCC ready locomotives and provides the easiest installation possible with the eight-pin NMRA mounting found on all DCC ready locomotives. There are not wires to solder! The ZTC 4007 is a top of the range, fully featured decoder available at a ground breaking price.

I always set up my locos on a programing track and I as able to read CVs and even been able to reset the decoder to factory defaults but it still does not seem to make any difference.

I am using gaugemaster prodigy DCC and have used TCS M1 , lenz Silver and have several SWD sound decoders, all of these work fine.

I will try an disconnect the capacitor and see if this makes any difference

I had no real reason to try the ZTC4007 just thought i would give them a go as supposidly all DCC systems are compliant with others

I will try and contact ZTC tomorow and see what they have to say

Thanks
Bob