Display shows E4 after driver replacement, Prices not sent.

Potential Symptoms

  • Display shows E4 on boot up and then goes blank with decimal flashing.
  • E4 error on gas display.
  • After installation or Fuelight driver replacement, E4 shows temporarily and then goes away. After this, the decimal begins to flash slowly.
  • If replacement driver is from Host display, all other drivers may lose their price after powering on new driver and only show their decimal point.


  • Product Family: Digit and Price Displays
  • Products: Fuelight, DataMaster, FL-2000, FL-2100, FL-2109, FL-2300, FL-4000, DF-2000, DF-2009, DF-2100, DF-2109, DF-2300, DF-4000, Gas Price or Petroleum Price Display, FL or DF product, Thin Driver replacement.
  • Component:
  • Control System: Key fob, RC-100, or DM-100


  • Display has not had prices sent to it since the new driver was installed.


  • Re-send prices to display using DM-100, RC-100, or key fob remote.

KB ID: DD2085633

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