Diagnostic Screens Information - Norcold 121X Series Service Manual

Diagnostic Screens Information

Screen All Diagnostics LED On
1 COLD-
9 COLDEST
Confirms display is set to Diagnostics. Within
five seconds the screen number is replaced by
. All LED segments should be lit.
1 COLD-
9 COLDEST
1 COLD-
9 COLDEST
Replace the optical control display assembly if
any segment fails to light.
Pressing the switch button displays
MODE
screen .
1 COLD-
9 COLDEST
Screen All Diagnostics LED Off
1 COLD-
9 COLDEST
The screen number displays and within five
seconds it turns off
should remain lit.
1 COLD-
9 COLDEST
Replace the optical control display assembly if
any other segment is lit.
Pressing the switch button displays
screen .
MODE
1 COLD-
9 COLDEST
74
S 9
ection
. Only the ON LED
1 COLD-
9 COLDEST
ON LED
Screen Fin Temperature
1 COLD-
9 COLDEST
Displays fin temperature as sensed by the
temperature sensing circuit through the
thermistor. This is not freezer or fresh food
cabinet air temperature.
The example illustrated below shows 30
degrees Fahrenheit (1 degree Celsius) fin
temperature.
1 COLD-
9 COLDEST
An open or shorted thermistor displays 00 as
illustrated below.
1 COLD-
9 COLDEST
Pressing the switch button displays
MODE
screen .
1 COLD-
9 COLDEST
Screen Stored Fault History
1 COLD-
9 COLDEST
The first of two stored fault history screens.
It displays stored fault history using lit LED
segments. Segments fault descriptions are
illustrated below.
2-Fresh food compartment
door open for more than two
minutes
1 COLD-
5-AC mode selected but
9 COLDEST
AC voltage not available
Pressing the switch button displays
MODE
screen .
1 COLD-
9 COLDEST
1-Burner failed to light/relight
3-DC voltage low
4-DC voltage high
6-AC relay stuck closed
7-AC heaters failed open