About a month ago I had a Bachmann H-4 that gave me a fault code "9". So to help narrow down whether the problem is in the engine or the tender I swapped the tender of another H-4 that I knew worked. After swapping the tenders the locomotive in question worked flawlessly. So the issue is with either the decoder or it's wiring. The train engine sat for a week and this afternoon I went to run a train for my nephew and the engine will not move, I have all my sounds and headlight but the decoder from the good operating engine is now throwing my a fault code "11" motor connection fault. The engine and tender have not been disconnected since the last time it ran. I also triple checked all my track to make sure no metal was laying across the rails creating a short. Is there anything else that could be causing this fault code? This is the second decoder issue I have had out of the 3 H-4's that i own. This is really making me think twice about buying another Bachmann product, any help would be appreciated.

Thanks, john