DOA T&P F7 unit heading back to Texas

it's possible the Z-4000 might have just enough voltage going out at zero throttle that the electronic e-unit won't cycle?

I thought of that and killed the power with the toggle switch: “Still negative function!”

My hope is that the shipping back to the dealer shook something loose in these new fangled black boxes, so it will run. One could wish for an old fashioned E unit...

Did you try running the engine via Bluetooth ?

Do you have lights/sounds ?

I assume you are running conventional ? If the engine was in neutral and somehow the PGM/RUN switch was put into PGM position, it could be locked in neutral.

I’m like Mr. Monk - don’t like change.... I tend to keep with the old ways. Only tried conventional.  I considered trying that Bluetooth deal  but since I wanted to run conventional I went with sending it back.

Understood, but in this case it would be simply as a diagnostic test - not for permanent running.

Hope it runs right when you get it back.

Thanks, me too. I thought I would never get one, got lucky, paid too dollar, and....

Seems to me there have past reports of some Lionel engines that didn't play well with MTH transformers. Some operators have said their rule is when running Lionel engines, use Lionel transformers for best operation, and vice versa. In come cases people have talked about sine wave issues and differences between Lionel and MTH transformer output, but I don't recall the details.