Some DCC accessories, especially those made by European manufacturers such as Roco, Hornby, or Lenz, might need additional accessory packets sent before they correctly respond to accessory commands.
To resolve this, Press prog/esc 4 or 5 times to get to "set Cmd station. "Press the enter key four times. Look for "# of ACC Packets."
The default is 4. Try increasing the number of horn stop packets to 8, 16, or 32.
Press prog/ESC to exit until you see the regular loco screen.
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