Locomotive refuses to run

[dutchbuilder]

I'm not going to tell you guys what kind of locomotive because it's irrelevant to the case.
Here is what happened.
I had to repair and rewire the locomotive because of wire length problems.
The OEM sound decoder also had died so i used a standard 2 function Bachmann decoder as stand in.
I programmed it with JMRI and a Sprog3 using adress 3 and ran it on my big layout using my Lenz equipment.
Everything works fine ,ran for several hours without any hick ups.
I gave it back to the owner who also uses Lenz equipment.
Nothing...dead as the proverbial doornail.
Ok , something could have happened during transportation.
Got it back, put in on my track......works perfectly.
Shoot me and my friend , we are at a total loss, what is happening here?
Btw he took it back home and it still refuses to budge.

Ton

[dutchbuilder]

Never mind , the problem has solved itself by RTFM.
The decoder was unintentionally switched into consist slave mode.
And then it doesn't work....PFFFFFFFFFF

Ton

[efehser]

Fun with electronics...
I would recommend a big hammer, but that might be a bit extreme.

[dutchbuilder]

Usually i give a free flying lesson to the offending object.

Ton