Diagnostics: Thermal Dimming


  • Inappropriate dimming levels. Depending on the ambient light conditions, the display may be too dim to read.

IDM / System Health Event(s)

  • Thermal Dimming alert in Diagnostics


  • Product Family: Message Displays
  • Product: System Health, IDM
  • Component: DB-1000, AF-2014
  • Control System: 


  • display cooling system malfunctioned
  • display filters plugged

Onsite Troubleshooting Steps

  • Display face using fans/filtered display:
    • investigate fans, thermostat, and filters in problem area
    • if fans are not running adjust the thermostat to see if will activate the fans
      • if fans do not activate check power to thermostat
      • if there is power to the thermostat and it is still not working, replace thermostat
    • if fans are running check for dirty filters and replace as necessary
  • Display face using air conditioners:
    • verify thermostat controlling the air conditioning is set properly and that kicks on the AC system
    • HVAC tech will be needed to determine any issues with the air conditioning system itself.

KB ID: DD2056556

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