I'm very new to DCC and have a Bachmann EZ Command Control Center transformer.  I put an HO Spectrum 4-4-0 DCC (no sound) locomotive on my track and it runs full throttle in forward without moving the throttle knob.  The only way to stop it is to hit the stop button.  It will not run in reverse.  Anyone ever encounter this before and if so, how does one correct it?