www.norcold.com/cda 63N6XX/N8XX ModelsRefrigerator Service ManualFigure 47. Models N64X/N84X Optical Control Assembly.Diagnostic ModeThe Diagnostic Mode uses ten diagnostic channels,commonly known as "screens", to display "live"inputs, outputs, and fault history. Each screen isidentified by a number, which shows in the opticalcontrol assembly display. See Figure 47.The N64X/N84X optical control display uses a dual 7-segment LED module to display the screen numberand diagnostic information. Information made up of fourletters or digits displays in an alternating sequence.Fault history, "live" inputs, and outputs is presentedusing LED segments. The diagnostic LED segments, ifpresent, display to the right of the screen number.Diagnostic LED segments identification numbers. SeeFigure 48.Exiting the Diagnostic ModeTo exit the Diagnostic Mode:1. Press and hold MODEand TEMPSETbuttons at thesame time.2. Release the MODEand TEMPSETbuttons as soon as thedisplay shows .Turning the refrigerator OFF then back ON also exitsthe Diagnostic Mode.DIAGNOSTIC MODE — MODELS N64X/N84XON TEMPSETMODE ON-OFF1-COLD COLDEST-9DisplayAccessing the Diagnostic ModeTo access the Diagnostic Mode:1. Press and hold both the MODEand TEMPSETbuttons atthe same time.2. Release the MODEand TEMPSETas soon as screendisplays.3. A few seconds later, displays.Changing ScreensTo change screens, press and hold the MODEbuttonuntil the next screen displays.Figure 48. Diagnostic LEDs Segments Identification.12 3745 6ON Light