Diagnostic Mode; Access Diagnostic Mode; Change Screens; Exit Diagnostic Mode - Norcold 2118IM Service Manual

Diagnostic Mode

The diagnostic mode is a tool incorporated within the controls
and can be accessed via the optical display. This tool is designed
to assist in verifying temperature, inputs, outputs, and to retrieve
recorded faults stored by the controls by displaying the various
information via the LCD. Ten (10) screens, each having a particular
function, are used to display this information. For example, screen
three (3) displays the fresh food fin thermistor temperature, and
screens four (4) and five (5) display stored fault history.
The LCD utilizes a dual 7-segment display within the LCD. The
screen number is displayed utilizing the left-side 7-segment dis-
play while inputs, outputs, and various fault related information is
displayed utilizing individual segments of the right-side 7-segment
display. These individual segments will be defined/explained under
each of the individual screen descriptions to follow.

Access Diagnostic Mode

1. Press and hold both the MODE and the Temperature Set but-
tons at the same time.
2. Release the MODE and the Temperature Set buttons as soon
as screen
3. A few seconds later,

Change Screens

To change screens, press and hold the MODE button until the next
screen displays.

Exit Diagnostic Mode

4. Press and hold both the MODE and the Temperature Set but-
tons at the same time.
5. Release the MODE and the Temperature Set buttons when the
mode icons and temperature setting once again display.
Turning the refrigerator OFF then back ON also exits the Diagnos-
Diagnostic Screen 4 (Initial View)
tic Mode.

Screens and Diagnostic Segments Information

Screen 1. All Diagnostic Icons ON
Diagnostic Screen 1 (Initial View)
Screen 1 (Initial view)
Screen 1 verifies all icons are operational by turning them on.
www.norcold.com
displays.
set
code
s.
display
Diagnostic Screen 1 (Second View)
Screen 1 (Second view)
Screen 2. All Diagnostic Icons OFF
Press the MODE button to bring up screen 2.
Diagnostic Screen 2 (Initial View)
Screen 2 (Initial view)
Screen 2 verifies all icons are operational by turning them off
Screen 3. Fresh Food Fin Temperature
Press the MODE button to bring up screen 3.
Diagnostic Screen 3 (Initial View)
Screen 3 (Initial view)
Screen 3 displays the actual fin temperature being sensed by the
thermistor. This is not the fresh food cabinet air temperature.
The example shows the fin temperature to be 20°F.
■ If the thermistor is "open", the second view will show "00".
■ If the thermistor is "shorted", the second view will show "99".
Screen 4. Stored Fault History
Press the MODE button to bring up screen 4.
Diagnostic Screen 4 (Initial View)
Screen 4 (Initial view)
Diagnostic Screen 4 (Second View)
Note: All segments shown as being on
Screen 4 displays stored fault history using lighted LED segments.
Refer to illustration below for fault history definitions of the indi-
vidual LED segments. If a fault occurred, its assigned fault history
Individual segment identification:
set
code
AC mode selected
but not available
25
Diagnostic Screen 2 (Second View)
Screen 2 (Second view)
Diagnostic Screen 3 (Second View)
Screen 3 (Second view)
Diagnostic Screen 4 (Second View)
Note: All segments shown as being on
Screen 4 (Second view)
All segments shown as being on.
Individual segment identification:
Ignition Fault
AC mode selected
but not available
1
Door Ajar
2 3
DC voltage low
4
DC voltage high
5 6
AC relay stuck closed
7
AC heater failed open
Ignition Fault
1
Door Ajar
2 3
DC voltage low
4
DC voltage high
6
5 AC relay stuck closed
7
AC heater failed open
SERVICE MANUAL