Bachmann Ultimate won't work with a few decoders

[westerngauntlet]

Hi I have many locos and decoders all working fine with my Bachmann Ultima controller.

 

However a few recent purchases do not work.

 

They appear to program, I can read and write correct cv values. I have tried dcc decoder reset cv8=8.

 

However loco do not respond to throttle on main track or any F functions.

 

The appear to program and jolt slightly on programming (although maybe not as much jolt as others)

 

I am successfully programming a variety of other decodes since having issues.

 

Any thoughts on solution.

 

And I acknowledge far more sophisticated controllers are available at far highs prices. I am generally very happy with my Ultima.

[chriswright03]

I think it would help people to help you if you supply a bit more information i.e. brands and models.  It may well be that known issues exist with certain models and when you talk about recent purchases are you talking about decoders or locos?