• Some batteries must be turned on first. The system is a plug-and-play system. The display cables should be disconnected once and checked for broken/bent pins. Then plug the plugs back together again, arrow to arrow. 
  • Disconnect the plug connection from the brake lever to the display and turn on the display. If the system is working again, the E-brake lever must be replaced. 
  • If present, disconnect the front lamp and turn on the display. If the system works again, the e-bike lamp will most likely cause a short circuit. The e-bike lamp and, if necessary, the light cable should be replaced. 
  • The NCM Moscow, NCM Milano, NCM Venice 48V may have a loose battery connector as a cause. Unscrew the battery holder at the top and disconnect the rigid connection and plug it back together again. Check soldering point to battery plug.
  • if none of the above work the issue may be due to a faulty display or faulty battery.