Prices are not changing and "Display response NACK" error; Poor wireless signal

​​​Potential Symptoms

  • Gas prices not changing.
  • DM-100 handheld says "Display response NACK".


  • Product Family: Fuelight
  • Product: FL-2000
  • Component: Serial Radios
  • Control System: FLR-1500


  • Poor wireless signal.


  • Improve wireless signal by changing channels on radios to different channel and rebooting system.

KB ID: DD3734353

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