Lionel 6-18292 UC30-C not Running

You might try doing a TMCC Reset sequence as described in the instructions for your engine on page 16. Website to get manual, if you don't have it, is:

https://www.lionelsupport.com/...ents/71-8293-250.pdf

I have recovered some sound operations by doing the reset of several TMCC engines, but I don't remember having an engine that didn't move and then fixed with the TMCC Reset - but worth a try.

If you haven't already done so, just check around the wheels and any gears you can see that nothing is jammed into them preventing them from turning.

Thanks... I tried the reset but it did not work and checked the wheels and gears and everything is clear. 

By chance is the Train Brake engaged?

It may be in PROG mode even though the switch is in RUN (if a wire came off).  Try this test.  Turn all power off.  Unplug power to your Legacy Base so there is no Legacy or TMCC signal on the layout. Now power up the track with your U30C and see if it will move using transformer power only.  If it does not move then here are some threads that may be helpful.  I was in your shoes 12 years ago just starting out with this same model locomotive.

https://ogrforum.com/...564#3682341338204564

https://ogrforum.com/...-board-compatability

https://ogrforum.com/...739#6498170308309739

Actually, program mode is when the switch is closed, RUN would be with the switch open.

Thanks for the info and the links. UC30 does the same thing in conventional mode with the Legacy base disconnected. Removed the shell, reset the boards and check the wiring and still no movement. From the from links looks like it's the DCDRS board causing the issue.

A few have reported success by disconnecting and reconnecting the molex (black 6 pin) connector on the DCDR board.  They are kind of tough to pull plus there is a release you need to depress also.  It’s worth a try because that board is no longer available from Lionel.  If you can’t locate a board ERR is an option for this loco.  

Thanks... I was able to disconnect and reconnect the black 6 pin connector but unfortunately it did not work.  Guess I am going to have to by a replacement engine.

You can replace the DCDS in that locomotive with the ERR Cruise Commander M, it's a pretty easy replacement.

Thanks... I will give the ERR Cruise Commander M a shot.

As a last shot, power up the loco where it should be running and jiggle the wires near the black Molex connector.