Unable to change gas prices, bad signal (line to line) cable

​Potential Symptoms

  • One or more displays may show E4 and will not update but host display is responding.
  • Unable to change gas prices on one or more fuel displays.
  • Decimal does not blink on one or more displays when trying to change price and cycling power does not resolve issue.
  • When selecting the "Detect Displays" option on the DM-100, not all displays are detected.
  • FL-3000 line to line cable indicator LEDs (DS2 and DS3) are flickering on and off despite having cable plugged in correctly.
    • LEDs are not lighting correctly despite being plugged in.  (Ex: J9 LED is blank but J10 LED is lit up despite being connected to each other.)


  • Product Family: Digit and Price Displays
  • Product: FL and DF products, Gas or Fuel Price Display, FL-3000, FL-4500, FL-2000, FL-2100, FL-2109, FL-2300, FL-4000, DF-2000, DF-2009, DF-2100, DF-2109, DF-2300, DF-4000
  • Component: Signal (Data) cable, Line to Line Cable
  • Control System:


  • Signal cable (line to line) has failed and is not passing data between drivers.


  • Replace signal (line to line) cable.

KB ID: DD1992714

Fill out my online form.
DISCLAIMER: Use of this content may void the equipment warranty, please read this DISCLAIMER prior to performing any service of the equipment.