Norcold N84X.3 User Manual

Screen
Number

2 Seconds

Blank
Screen
(2 second
pause)

1 Second

DC voltage high

AC relay stuck closed

Door ajar

DC voltage low

AC heater failed open

AC mode selected
but not available

Ignition fault

Flame sense failure

Thermistor failure.

AC voltage low

AC voltage high

Screen 1 confirms that the Diagnostic Mode is active. A
few seconds after the number displays, all LED
segments light. See illustration

Screen 3 shows the actual fin temperature being
sensed by the thermistor. This is not the fresh food
cabinet air temperature. The illustration shows 30°F fin
temperature as displayed in screen 3.

Press the 

 button to bring up screen 4.

Screen 4 displays stored fault history using lighted LED
segments. The illustration provides fault history
information and assigned LED segments. If a fault
occurred, its assigned LED will light.

Screen 5 also displays stored fault history using lighted
LED segments. The illustration provides fault history
information and assigned LED segments. If a fault
occurred, its assigned LED will light.

If the LED segments do not match the illustration, the
fault is in the optical control display.

Replacing the optical control assembly should resolve
this fault.

Press the 

 button to bring up screen 2.

Screen 2 continues to confirm the reliability of the
display. The screen should go completely blank after
the screen number is displayed.

Press the 

 button to bring up screen 6.

If an LED segment displays, the fault is in the optical
control assembly.

Replacing the optical control assembly should resolve
this fault.

Press the 

 button to bring up screen 3.

Press the 

 button to bring up screen 5.