Norcold 2118IM, 2118IMSS, 2118BK, 2118, 2118SS Service Manual

Service Manual

Gas Electric Refrigerators

MODELS

2118, 2118SS, 2118BK

Improper installation, adjustment, altera­tion, service or maintenance can cause
personal injury or property damage. Refer
to this manual. For assistance or addition-

al information, contact a qualied installer,

service agency, or the gas supplier.

2118IM, 2118IMSS, 2118IMBK

2118IMD, 2118SSIMD, 2118IMDBK

© 2016 NORCOLD, INC. All rights reserved.

Questions? 1-800-444-7210

Part No. 637026 Rev. B 03.14.2016

Contents

Safety .......................................................................................................... 3

Introduction .................................................................................................. 4

About This Manual .................................................................................. 4

Certification and Code Requirements ..................................................... 4

About Installation ..................................................................................... 4

Replacement Parts .................................................................................. 4

Technical Assistance ............................................................................... 4

Model Identification ................................................................................. 4

Cooling Unit Serial Number ..................................................................... 4

Refrigerator Model Number ..................................................................... 4

Specications .............................................................................................. 5

Exploded View ............................................................................................. 6

General Information ..................................................................................... 8

Ventilation ................................................................................................... 8

Overview ................................................................................................. 8

Enclosure ................................................................................................ 8

Baffles ..................................................................................................... 8

Lower Intake Vent .................................................................................. 8

Exhaust Vent ........................................................................................... 9

Roof Cap ................................................................................................. 9

Propane Gas Connections .......................................................................... 9

Leak Test-Detergent ................................................................................ 9

Leak Test-Compressed Air ...................................................................... 9

Electrical Connections ................................................................................. 9

120 Volts AC Electrical Connection ......................................................... 9

12 Volts DC Electrical Connection .......................................................... 9

Power Board Fuses ................................................................................. 9

Electrical Components .............................................................................. 10

Fresh Food Compartment Light ............................................................ 10

Divider Heater ...................................................................................... 10

12 Volt DC Fans ................................................................................... 10

Thermostatic Switch ............................................................................. 10

Movable Door Seal ............................................................................... 10

Replacement Fuse Size ........................................................................ 10

Temperature Monitor Control (TMC) ......................................................11

Preventative Maintenance ..........................................................................11

Gas Flame Appearance ............................................................................. 12

Remove and Clean the Burner Orice ...................................................... 12

Controls ..................................................................................................... 12

Power ON / OFF Button ........................................................................ 12

Mode Button .......................................................................................... 13

Temperature Set Button ........................................................................ 13

Temperature Indicator ........................................................................... 13

Gas Operation ....................................................................................... 13

Modes of Operation ................................................................................... 14

Gas Mode .............................................................................................. 14

AC Mode ............................................................................................... 14

Lighting Instructions .................................................................................. 14

Test the Gas Safety Valve ......................................................................... 14

Diagnostic Pre checks ............................................................................... 14

Fault Codes .............................................................................................. 15

Blank Display ........................................................................................ 15

no AC .................................................................................................... 17

no FL ..................................................................................................... 17

FL -- ....................................................................................................... 17

no AC, no FL ......................................................................................... 18

AC rE ..................................................................................................... 18

AC HE ................................................................................................... 18

oP LI ...................................................................................................... 18

Temperature Monitor Control (TMC) - Red Light Flashing .................... 20

Temperature Monitor Control (TMC) - Red Light on Solid ..................... 21

Clear the Temperature Monitor Control (TMC) Lockout State ............... 22

Sr ........................................................................................................... 23

Lo dc without alarm ............................................................................... 23

Lo dc without alarm while in GAS Mode ............................................... 23

Lo dc with alarm .................................................................................... 23

dr ........................................................................................................... 24

Flashing temperature setting icon ......................................................... 24

Diagnostic Mode ........................................................................................ 25

Access Diagnostic Mode ....................................................................... 25

Change Screens ................................................................................... 25

Exit Diagnostic Mode ............................................................................ 25

Screens and Diagnostic Segments Information .................................... 25

Ice Maker ................................................................................................... 28

Wiring Diagram .......................................................................................... 29

Wiring Pictorial .......................................................................................... 30

2118 Rear Wiring Views ............................................................................ 31

2118IM and 2118IMD Rear Wiring Views ..................................................32

Remove / Replace the Refrigerator ........................................................... 34

Remove the Refrigerator ....................................................................... 34

Replace the Refrigerator ....................................................................... 34

Figures

Fig. 1 - Double-wrenching gas fittings ..................................................... 3

Fig. 2 - Cooling unit bar code label location. ........................................... 4

Fig. 3 - Refrigerator information label location ....................................... 4

Fig. 4 - Exploded front view .................................................................... 6

Fig. 5 - Exploded rear view .................................................................... 7

Fig. 6 - Typical roof exhaust venting .....................................................8

Fig. 7 - Thermostatic switch for fans. .................................................... 10

Fig. 8 - Movable door seal. .................................................................... 10

Fig. 9 - Temperature monitor control ......................................................11

Fig. 10 - Burner Box Location .............................................................. 12

Fig. 11 - Burner/Orifice Assembly ......................................................... 12

Fig. 12 - Control Locations ................................................................... 12

Fig. 13 - Mode Indicators ..................................................................... 13

Fig. 14 - Continuous 12 Volts ............................................................... 15

Fig. 15 - Switched 12 Volts ................................................................... 16

Fig. 16 - Magnet position ....................................................................... 22

Fig. 17 - Wiring Diagram ...................................................................... 29

Fig. 18 - Wiring Pictorial ........................................................................ 30

Fig. 20 - 2118 upper rear wiring ............................................................ 31

Fig. 21 - 2118 lower rear wiring ............................................................ 31

Fig. 23 - 2118IM lower rear wiring ......................................................... 32

Fig. 22 - 2118IM and 2118IMD upper rear wiring .................................. 32

Fig. 24 - 2118IMD lower rear wiring ...................................................... 33

2118, 2118IM, 2118IMD Series

FRENCH AND SPANISH TEXT BEGINS ON PAGE 35.

2

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Safety

CAUTION

WARNING

WARNING

CAUTION

It is not possible to anticipate all of the conceivable ways or condi­tions under which the refrigerator may be serviced or to provide
cautions as to all of the possible hazards that may result. Standard
and accepted safety precautions and equipment should be used

when working on electrical circuits and handling toxic or ammable

materials. Safety goggles and other required protection should be
used during any process that can cause material removal, such as
when removing a leaking cooling unit and cleaning components.

Read this manual carefully and understand the contents before
working on the refrigerator. Be aware of possible safety hazards
when you see the safety alert symbol on the refrigerator and in this

manual. A signal word follows the safety alert symbol and identies

the danger of the hazard. Carefully read the descriptions of these
signal words to fully know their meanings. They are for your safety.

This signal word means a hazard, which if

!

!

ATTENTION

ignored, can cause small personal injury
or much property damage.

This signal word means a hazard, which
if ignored, can cause dangerous personal
injury, death.

Do not use leak test solutions that contain
ammonia or chlorine. Ammonia and chlo­rine degrade copper and brass compo­nents.

The cooling unit is a sealed system under
pressure! Do not try to repair or recharge
the cooling unit. Do not bend, drop, weld,
drill, puncture, saw, or strike the cooling
unit.

Handle a leaking cooling unit with extreme
caution! The cooling unit contains am­monia, hydrogen, and sodium chromate.
Ammonia can cause severe skin and eye

burns. Hydrogen is highly ammable, can
ignite and burns with an intense ame.

Certain chromium compounds, such as
sodium chromate, are carcinogenic.

Do not use extension cords. Do not re­move the grounding prong from the refrig­erator AC power cord. Do not use a two
prong adapter to connect the refrigerator
to the AC outlet.

!

ATTENTION

Norcold refrigerators are designed and
equipped for the use of propane gas
only. Do not modify, alter, or equip the
refrigerator to any other fuel (natural gas,
butane, etc.).

Incorrect installation, adjustment, altera­tion, or maintenance of the refrigerator
can cause personal injury, property dam­age, or both.

Do not smoke, light res, or create sparks

when working on propane gas system.

Propane gas is highly ammable and
explosive. Do not use an open ame for

leak testing any of propane gas system
components.

Always use two wrenches to tighten or
loosen propane gas connections. Dam­aged connections, piping, and compo­nents create the potential for gas leaks.

All electrical connections and repairs to
the refrigerator must comply with all appli-

cable codes. Refer to the certication and

code requirements section of the Installa­tion Manual.

Turn off AC power and DC power sources
before attempting to remove, service, or
repair any of the refrigerator’s electrical
or electronic components. Do not work on
live electrical circuits.

Do not over-fuse electrical circuits. Use

specied fuses and AWG wire sizes. The
specication section of this manual pro-

vides fuse size information. Refer to the

Installation Manual for the correct AWG
wire size specications.

Prevent child entrapment! Before dispos­ing of the refrigerator, remove all doors
and fasten all shelves with retainers.

Make sure all hardware such as hinges
and fasteners (retaining screws, etc.), are
properly fastened.

Obey the instructions in this manual with
regard to intake and exhaust venting

specications.

Do not install the refrigerator directly on
carpet. Put the refrigerator on a metal or
wood panel that extends the full width and
depth of the refrigerator.

!

Some of the refrigerator’s metal com­ponents have sharp corners and edges.
Wear hand protection, such as cut resis­tant gloves, and exercise extreme care
when handling the refrigerator.

www.norcold.com

Do not modify, bypass, or eliminate any of
the refrigerator’s electrical components,
electronic circuits, or propane gas system
components.

Do not wet or spray liquids on or near
electrical outlets, connections or compo­nents. Most liquids, including leak detec­tion solutions, are electrically conductive
and pose the potential for an electric
shock hazard, short electrical compo­nents, damage electronic circuits, and/or

ignite a re.

Fig. 1 - Double-wrenching gas ttings

3

NOR000129A-1

SERVICE MANUAL

NOTICE

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Introduction

■ Recreational Vehicle (RV) Make/Model/Year

About This Manual

This service manual provides maintenance, diagnostic, and repair
information for NORCOLD
sorption refrigerators. It is a reference tool designed for technicians
who are knowledgeable in the theory and operation of gas/electric

absorption refrigerators, liqueed petroleum (LP) gas–propane–

systems, and AC/DC electrical systems as installed in a variety of
recreational vehicles (RV).

All information, illustrations, and specications contained in this

publication are based on the latest product information available
at the time of publication. NORCOLD
changes at any time without notice.

®

2118, 2118IM, 2118IMD Series gas ab-

®

reserves the right to make

Certication and Code Requirements

NORCOLD® gas/electric absorption refrigerators are certied
under the latest edition of ANSI Z21.19B standards for installation
in mobile homes or recreational vehicles, and with the Canadian
Standards Association CAN/CGA-1.4-M94.

Electrical components are compliant.

About Installation

Refrigerator installation must conform with the 2118, 2118IM,
2118IMD Series Installation Manual for the NORCOLD
warranty to be in effect. Installation must also comply with appli-

cable local codes and standards set by the relevant certication

agency.

®

limited

Model Identication

2118, 2118IM, and 2118IMD Series models are shipped from the

factory as 2-Way units to operate on propane gas or 120 volts AC

electric.
Letter(s) appended to the model number identify factory installed

accessories. See Fig. 2.

Cooling Unit Serial Number

The cooling unit serial number appears on the cooling unit bar

code label. The label is afxed to the surface of the cooling unit

leveling chamber.

Be sure to have the cooling unit serial
number available if you need technical
support on this component.

Refrigerator Model Number

N000036A-1

1167359

NORCOLD

Replacement Parts

Use only authorized NORCOLD® replacement parts. Generic parts
do not meet NORCOLD
performance. The use of unauthorized aftermarket or generic re­placement parts voids the refrigerator’s limited warranty coverage.

®

specications for safety, reliability, and

Technical Assistance

If unable to resolve technical issues using the information provided
in this manual, technical support is available through NORCOLD
Customer Service Center:

Telephone: [phone]

(

Fax: [phone]

3

World Wide Web: www.norcold.com.

8

The following information is required to process technical support
requests:

■ Refrigerator Model Number

■ Refrigerator Serial Number

■ Refrigerator Cooling Unit Serial Number

2118, 2118IM, 2118IMD Series

Fig. 2 - Cooling unit bar code label location.

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NORC OLD

312

Serial Number

Model Number

313

Group Code

314

Input Pressure

®

315

BTUH

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Refrigerant

x.xx
LBS.
test pressure

Fig. 3 - Refrigerator information label location

312 Serial Number
313 Model Number
314 Group Code
315 BTU / h
316 Amount of refrigerant in cooling system
317 AC Voltage / Amperage
318 DC Voltage / Amperage

4

316

xxx VOLTS - AC xx HZ
x.xx AMPS xxx Watts
xx VDC xx HZ
x.x AMPS xx xx Watts

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317

318

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Specications

Rough Opening Dimensions

(H x W x D) --------------------------------------------------------------------------------------- 68.94 - 69.06 in. x 35.94 - 36.04 x 24.00 - 24.13 in.

Internal Capacities

Total capacity ----------------------------------------------------------------------------------------------------------------------------------------18.18 cu. ft.
Freezer ------------------------------------------------------------------------------------------------------------------------------------------------- 5.92 cu. ft.
Fresh food compartment --------------------------------------------------------------------------------------------------------------------------12.57 cu. ft.

Controls

Type ------------------------------------------------------------------------------------------------------------------ Electronic with built-in self diagnostic
ON/OFF, MODE, TEMP SET switches -------------------------------------------------------------------- LCD assembly with ush push buttons
Temperature setting range ------------------------------------------------------------------------------------------------- 1 = cold through 9 = coldest
Temperature / defrost sensing services ------------------------------------------------------------------------------------------------------ Thermistors
Fresh food thermistor ------------------------------------------------------------------------------------------------- Located on 2nd n from the right
Fans thermistor --------------------------------------------------------------------------- Located at rear of refrigerator on left most condenser n

DC Power

Electronic controls voltage requirement ----------------------------------------------------------------------------------------------- 10.5 to 15.4 VDC
Fuse-power board ------------------------------------------------------------------------------------------------ Automotive Blade, Type APR-5A-Tan

DC Current Draw at nominal 12 VDC

Fresh food blower ----------------------------------------------------------------------------------------------------------------------------- 0.200 - 0.300 A
Freezer blower---------------------------------------------------------------------------------------------------------------------------------- 0.140 - 0.185 A
Divider heater -------------------------------------------------------------------------------------------------------------------------------------------- 0.275 A*
Flapper heater ------------------------------------------------------------------------------------------------------------------------------------------- 0.417 A*
Perimeter heater ----------------------------------------------------------------------------------------------------------------------------------------0.275 A*
Interior light ----------------------------------------------------------------------------------------------------------------------------------------------- 0.500 A*
Gas valve -------------------------------------------------------------------------------------------------------------------------------------------------0.146 A*
External ventilation fans (2 at condenser) ---------------------------------------------- 0.430 A @ 12VDC - 2/29/2016 and before (per fan)*

----------------------------------------------------------------------------------------------------------0.277@ 12VDC - 3/1/2016 and after (per fan)*
External ventilation fan (1 at absorber) ------------------------------------------------------------------------------------------------------------0.140 A*
Ice maker water line heater (IM models only) ---------------------------------------------------------------------------------------------------0.167 A*
Ice maker water line heater (IMD models only) -------------------------------------------------------------------------------------------------1.250 A*
Dispenser water line heater (IMD models only) ------------------------------------------------------------------------------------------------- 0.167 A*
Dispenser water valve heater (IMD models only) ----------------------------------------------------------------------------------------------0.458 A*

AC power

AC input voltage requirements ------------------------------------------------------------------------------------------------------------ 108 to 132 VAC
Fuse-power board ------------------------------------------------------------------AGC Series, 8A, Fast Acting, Glass Tube (1/4 in. x 1-1/4 in.)

AC Current Draw

AC heaters (2) -------------------------------------------------------------------------------------------------------------------- 300 W, 2.5 A (per heater)
AC heater resistance -------------------------------------------------------------------------------------------------------46.0 Ω to 51.0 Ω (per heater)
Ice maker (IM models only) --------------------------------------------------------------------------------------------------------------180W at 115 VAC
Ice maker water valve (IM models only) ---------------------------------------------------------------------------------------------------------0.210 A**
Ice maker water valve (IMD models only) -------------------------------------------------------------------------------------------------------0.145 A**

Propane gas

Operating pressure ----------------------------------------------------------------------------------------------------------------------10.5 - 11.5 inch w.c.
Burner rating (8-slot burner / LP22 orice) -------------------------------------------------------------------------------- 3000 Btu/h at 11 inch w.c.
Burner orice size ------------------------------------------------------------------------------------------------------------------------------------------ LP22

Flame sensing ------------------------------------------------------------------------------------------------ Electronic through spark sense electrode
Electrode tip-to-burner gap ------------------------------------------------------------------------------------------------------------------1/8 to 3/16 inch

Off-level operating limits

Side-to-side-------------------------------------------------------------------------------------------------------------------------------3 degrees-maximum
Front-to-back ----------------------------------------------------------------------------------------------------------------------------- 6 degrees-maximum

* = Calculated, ** = Actual

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5

SERVICE MANUAL

Exploded View

23

22

21

12

13

11

20

24

25

18

17

11

16

14

15

19

27

8

7

10

9

6

2

3

2

1

5

1

4

3

NOR000450B

Fig. 4 - Exploded front view

Description

No.

1 Crisper
2 Crisper Lid
3 Crisper Lid Vent
4 Beverage Bin
5 Beverage Bin Cover
6 Crisper Cover Assembly
7 Middle Wire Shelf
8 Top Wire Shelf
9 Full wire Shelf
10 Fin Assembly
11 Blower Assembly
12 Guide Block
13 Thermistor

2118, 2118IM, 2118IMD Series

26

14 Freezer Wire Shelf With Hump
15 Freezer Wire Shelf
16 Ice Maker Shutoff Arm
17 Ice Maker
18 Ice Maker Cover
19 Crisper Bin
20 Light Switch
21 Lamp Bracket Assembly
22 Light Bulb
23 Light Cover
24 Drip Hose
25 Drip Cup
26 Dispenser Reel Assembly
27 Drip Tray

6

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Exploded View, cont'd.

24

23

25

NOR000206A

Fig. 5 - Exploded rear view

Description

No.

17 AC Heaters
18 Drip Cup
19 Gas Valve
20 Water Valve (IM and D models only - D version shown)

21 Temperature Monitor Control (TMC)
22 Power Board
23 Blower Assembly
24 Fan Thermostat
25 Cooling System
26 Burner Box

21

20

17

23

26

18

19

22

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7

SERVICE MANUAL

WARNING

General Information

WARNING

To conrm that installation is adequate, check for:

■ Adequate ventilation - refer to "Ventilation Requirements."

■ Both gas and electrical components installed and operating in a
safe condition.

■ Adequate seal between refrigerator mounting ange and cut-out
opening.

■ Installed on a solid oor (not on carpet) and secured.

This refrigerator is not intended to be

!

ATTENTION

operated as a free standing unit (i.e.
where the products of combustion are not
completely isolated from the living area) or

installed in such a way as to conict with

these installation instructions. Unapproved
installations could result in safety risks or
performance problems.

Enclosure

The cabinet that encloses the refrigerator is built by the RV manu­facturer. Depending on cabinet depth, height, and width certain

bafes may be present when cabinet clearances exceed installa­tion guidelines and specications.

Bafes

Bafes prevent hot air buildup “pocketing” between the refrigerator

cabinet and the enclosure walls and/or ceiling. An enclosure may

be tted with:

■ An absorber bafe and a condenser bafe

■ Side bafes [320] (See Fig. 6)

■ Vertical top bafe [13]

■ Vertical angled bafes

■ Box bafe

■ Or a combination of any of the above.

Ventilation

Overview

The installed unit must

!

ATTENTION

Certied installation needs one lower intake vent and one upper

exhaust vent. Install the vents through the side wall of the vehicle
exactly as instructed in the Installation Manual. Any other installa-

tion method voids both the certication and the factory warranty of

the refrigerator.
The bottom of the opening for the lower intake vent, which is also

the service access door, must be even with or immediately below

the oor level. This allows any leaking propane gas to escape to
the outside and not to collect at oor level.

American Gas Association/Canadian Gas Association (AGA/CGA)
certication allows the refrigerator to have zero (0) inch minimum
clearance at the sides, rear, top, and bottom. While there are no
maximum clearances specied for certication, the following maxi-

mum clearances are necessary for correct refrigeration:

isolated from the combustion system of the
refrigerator and it must have complete and

unrestricted ventilation of the ue exhaust

which, in gas mode, can produce carbon
monoxide. The breathing of carbon monox­ide fumes can cause dizziness, nausea, or
in extreme cases, death.

be completely

For complete detail about any necessary bafe(s), refer to the

refrigerator Installation Manual.

Lower Intake Vent

Ventilation and combustion air ow through the lower intake vent
[9] (See Fig. 6), which also serves as the service access or door.

The lower intake vent needs be kept clear of obstructions that may

restrict the ow of fresh air into the enclosure.

319

179

Front of RV

12

13

Bottom 0 inch min. 0 inch max.
Each Side 0 inch min 1/4 inch max.
Top 0 inch min. 1/4 inch max.
Rear 0 inch min. 1 inch max.

These clearances plus the lower and upper vents cause the natural
air draft that is necessary for good refrigeration.

Cooler air goes in through the lower intake vent, goes around the
refrigerator coils where it removes the excess heat from the refrig­erator components, and goes out through the upper exhaust vent.

If this air ow is blocked or decreased, the refrigerator may not cool

correctly.

Each NORCOLD model is certied by AGA and CGA for correct

ventilation.

2118, 2118IM, 2118IMD Series

NOR000201A

Fig. 6 - Typical roof exhaust venting

8

320

9

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Ventilation, cont’d.

WARNING

WARNING

WARNING

Exhaust Vent

Warm air and combustion gases ow out of the enclosure through

the exhaust vent. The exhaust vent can be either a roof exhaust

vent [12] or an upper sidewall exhaust vent.

The roof exhaust vent has a non-removable metal mesh screen
to prevent leaves, birds, rodents and/or debris from entering the
enclosure.

inches Water Column).

■ If the pressure of the compressed air is more than 1/2 psig (14
inches Water Column), remove the gas supply line from the 3/8
inch male are tting of the refrigerator before the test.

■ If the pressure of the compressed air is equal to or less than
1/2 psig (14 inches Water Column), push and hold the ON/OFF

button (

) for one (1) second before the test.

Electrical Connections

Roof Cap

The roof cap [319] ts over exhaust vent. The sloped end always
faces the front of the RV [179] (See Fig. 6). It is held in place by
four 2-1/2” long Phillips head screws.

Propane Gas Connections

The refrigerator operates on propane gas at a pressure of 10.5
inches Water Column min. to 11.5 inches Water Column max.

!

ATTENTION

■ Do not smoke, or use an open ame near the propane gas
system.

■ Do not use an open ame to examine for leaks.

■ Do not connect the refrigerator to the propane gas tank without
a pressure regulator between them.

■ To avoid possible propane gas leaks, always use two wrenches
to tighten or loosen the propane gas supply line connections.

■ Leaking propane gas can ignite or explode and result in danger-
ous personal injury or death.

!

ATTENTION

Leak Test-Detergent

Using a solution of liquid detergent and water:

■ Examine the propane gas supply system for leaks: make sure

the propane gas supply line and all gas connections have no
leaks. Do not use any liquid that contains ammonia.

Leak Test-Compressed Air

If you use compressed air for the test:

■ The pressure of the compressed air at the 3/8 inch male are

tting of the refrigerator must not be more than 1/2 psig (14

Be very careful when working on or near
the propane gas system.

Do not allow the leak detecting solution
to touch the electrical components. Many
liquids are electrically conductive and can
cause a shock hazard, electrical shorts,

and in some cases re.

120 Volts AC Electrical Connection

The refrigerator is equipped with a three prong plug for protection
against shock hazard and must be connected into a recognized

three prong attachment receptacle. The free length of cord is 24”.

The cord must be routed so as not to come in contact with the

burner cover, ue pipe or any other component that could damage

the cord insulation.

Do not remove (cut)grounding plug from

!

ATTENTION

■ Verify AC power cord is in a grounded three-prong receptacle.

■ Verify receptacle is within easy reach of the lower intake vent.

■ Verify power cord does not touch the burner cover, the ue
pipe, or any hot component that could damage the insulation of
the power cord.

the refrigerator AC power cord. Removal
of this prong can result in a severe electri­cal shock, as well as voiding the refrigera-

tor’s electrical certication and warranty.

12 Volts DC Electrical Connection

The refrigerator controls require 12 volt DC to operate. The

minimum control voltage is 10.5 volts DC. The maximum control
voltage is 15.4 volts DC.

Polarity

The correct polarity of the DC leads to the power board connec­tions is:

■ The + 12 volt DC (positive) supply wire from the battery must be

connected to the terminal marked “12VDC” on the power board.

■ The - 12 volt DC (negative) supply wire from the battery must be

connected to the terminal marked “GND” on the power board.

Power Board Fuses

The DC controls circuit is protected by an Automotive Blade, Type

APR-5A-Tan fuse located on power board terminal F1. The AC
circuit is protected by an AGC Series, 8A, Fast Acting, Glass Tube
(1/4 in. x 1-1/4 in.) fuse located on power board terminal F2.

■ See wiring diagram in this manual. Both negative and positive

supply wires require 1/4” female quick connect terminals.

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9

SERVICE MANUAL

Electrical Connections, cont’d.

NOTICE

WARNING

■ Use a minimum of 18AWG wire for supply wire and maximum 6
A in-line fuse for the DC power supply wires.

■ Make sure an in-line fuse is installed on the DC positive wire,

as near the battery as possible, between the battery and the
terminal block of the refrigerator.

from the enclosure to test the thermostatic
switch. If the vehicle has an upper side­wall exhaust vent, you are able to test the
thermostatic switch by removing the upper
sidewall vent.

322

This in-line fuse is necessary for added

!

ATTENTION

safety, even though the refrigerator has a
DC fuse in the control assembly.

Replacement Fuse Size

AC circuit AGC Series, Fast Acting,Glass Tube (1/4 in.x 1 -1/4 in.)
DC circuit Automotive Blade, Type APR-5A-Tan

Electrical Components

Fresh Food Compartment Light

The fresh food compartment light is turned on and off by door
operated switches. Each switch is located in the top of fresh food
compartment above each door.

Divider Heater

The divider heater is permanently “foamed into” the divider be­tween the freezer compartment and the fresh food compartment.
The divider heater warms this area to prevent condensation from
forming. Powering on the refrigerator automatically powers on the
divider heater. Power to the heater is continuously supplied by the
power board.

12 Volt DC Fans

12 volt DC fans increase ventilation of the cooling system. Two (2)
larger fans are located near the condenser on the rear of the cool­ing system foam plug. The third smaller fan is located below the
absorber coils of the cooling system.

All of the fans are unidirectional. The larger fans each draw 0.430
amps @ 12 volts DC. The smaller fan draws 0.140 amps @ 12

volts DC. Fan resistance through the fan motor circuit is approxi­mately 1.8 ohms.

The fans are controlled by a thermostatic switch.

10

321

323

NOR000202A

Fig. 7 - Thermostatic switch for fans.

Movable Door Seal

The apper assembly [324] (See Fig. 8) is hinged onto the left hand
door [10] of the fresh food compartment. The apper assembly pro-

vides the vertical sealing surface between the fresh food compart­ment doors for their inboard gaskets.

The apper is equipped with a 12 volt DC moisture reduction

heater. The heater is supplied power through a wire harness
foamed into the door.

The heater is turned on when spring pins, on the hinge side of the
door, make contact with the permanent contacts that are in the side
of the refrigerator cabinet. The left hand fresh food compartment
door must be fully closed to close the connection. Powering on the

refrigerator automatically energizes the apper heater circuit.

Verify that the heater is operating by touching the exterior sur-

10

Thermostatic Switch

The thermostatic switch [321] is located on the rst condenser n
[10] (See Fig. 7). Incoming +12 volt DC [322] is fed through the up­per terminal of the thermostatic switch. The +12 volt DC out [323]

connects to the lower terminal of the thermostatic switch.
The switch turns the fans on and off. The fans come on when the

temperature of the rst condenser n is about 130° F (54.4° C) and
turn off at about 115° F (46°C).

If the vehicle has a roof exhaust vent,
you may need to remove the refrigerator

2118, 2118IM, 2118IMD Series

Fig. 8 - Movable door seal.

10

324

Art01813

www.norcold.com

Electrical Components, cont’d.

face of the apper assembly. The surface of the apper assembly

should be slightly warm to the touch.

If the apper surface feels cold to the touch or is wet, troubleshoot

the heater as follows:

1. Check for any bent, broken or missing spring pins.

2. Check the door alignment. If needed, align the door so that
all of the spring pins make full contact with the center of the
contacts in the cabinet.

3. Check the heater resistance. Resistance reading should be
between 26 ohms and 31 ohms.

4. Replace the apper assembly if the heater is open, shorted, or
if the resistance is not between 26 ohms and 31 ohms.

NOR000212A-1

Temperature Monitor Control (TMC)

The purpose of the temperature monitor control is to prevent dam­age to the cooling unit due to an overheating condition in the boiler.

An overheating condition may be caused by one or a combination
of the following:

■ Insufcient or obstructed ventilation.

■ Inadequate installation in enclosure.

■ Heat deector cap blocked by insulation.

■ Heat deector cap jammed against ue opening.

■ Exceeding off-level limits.

■ Cooling unit blockage.

The temperature monitor control [326] acts as a temperature
supervising device (See Fig. 9). It uses a thermocouple, which is

positioned on the boiler, to provide the best possible monitoring of
temperature.

If the temperature of the boiler rises to an abnormal level, the high
temperature monitor opens to prevent the boiler from overheating.

The controls are programmed to detect when the monitor is open.
If the switch is open or not connected to power board terminals
LIMIT IN and LIMIT OUT, the controls:

■ Display fault code “LI” “oP”.

■ Stop AC and propane gas operation.

326

Fig. 9 - Temperature monitor control

Preventative Maintenance

An annual maintenance check is strongly recommended:

■ Leak test the gas lines.

■ Check combustion seal; repair or replace, if necessary (Visual
check without removing the refrigerator.).

■ Inspect or clean the burner or burner orice.

■ Check/adjust the electrode spark gap.

■ Insure the spark electrode tip is clean and that the electrode is
securely attached to the burner bracket.

■ Check/adjust AC and DC voltages and propane gas supply
pressure.

■ Check the gas safety valve (see procedure in this manual).

■ Insure that area around the burner and controls is free of de-
bris, oily rags, etc.

■ Inspect the controls, piping and wiring to insure that they are in
good condition.

THESE MAINTENANCE PROCEDURES MUST BE PERFORMED BY A
QUALIFIED SERVICE PERSON.

www.norcold.com

NORCOLD CANNOT ACCEPT RESPONSIBILITY FOR REPAIRS,
ADJUSTMENT, OR MAINTENANCE PERFORMED BY OTHER THAN A
QUALIFIED DEALER OR SERVICE CENTER.

11

SERVICE MANUAL

WARNING

Gas Flame Appearance

WARNING

WARNING

5. Remove the are nut from the orice assembly [77] (See Fig.

11).

While in propane gas operation, examine the appearance of the
gas ame:

■ Put the refrigerator on temperature setting 9 (the coldest tem-
perature setting).

■ Open the lower intake vent.

!

ATTENTION

■ Open the burner box door and look at the gas flame:

■ The ame should be a darker blue inside and a lighter blue
outside and should be a constant and steady shape.

■ The ame should not be yellow and should not have an er-
ratic and unstable shape.

■ Make sure the ame does not touch the inside of the ue
tube.

■ Close the burner box door.

■ The burner orifice should be cleaned as part of routine main-
tenance. Follow the Remove and Clean Burner Orifice instruc­tions. If the flame is not at peak performance after it has been
cleaned, contact Customer Service.

The burner box cover can be hot. Wear

gloves to avoid burns.

77

80

79

78

Art 00956

Fig. 11 - Burner/Orice Assembly

6. Remove the orice assembly from the burner [78].

When cleaning, do not try to remove the

!

ATTENTION

7. Clean the orice assembly with alcohol only. Using a wrench,
assemble the orice assembly to the burner. Assemble the
are nut to the orice assembly. Examine all of the gas connec-

tions for leaks.

orice [79] from the orice adapter [80].
Removal will damage the orice and can

cause a propane gas leak. Leaking pro­pane gas can ignite or explode and result
in dangerous personal injury or death. Do

not clean the orice with a pin or other

objects.

Remove and Clean the Burner Orice

Clean the burner and the burner orice annually. To clean the
burner orice:

1. Close the valve at the vehicle propane gas tank(s).

2. Push and hold the ON/OFF button (
turn the refrigerator off.

3. Open the lower intake vent.

4. Remove the burner box cover [165] (See Fig. 10) by removing

one (1) screw.

NOR000147A

Fig. 10 - Burner Box Location

To avoid possible propane gas leaks, al-

!

ATTENTION

ways use two (2)wrenches to loosen and

tighten the gas supply line at the 3/8 inch
male are tting.

) for one (1) second to

165

Controls

278

30 31

Art02493

280

Fig. 12 - Control Locations

No. Description

30 Power ON / OFF button
31 Mode button
32 Temperature set button
280 LCD (Liquid Crystal Display)
278 Temperature setting

Power ON / OFF Button

Push and release the Power ON / OFF button [30] (See Fig. 12) to

turn on the refrigerator.
Push and hold the Power ON / OFF button for one (1) second to

turn off the refrigerator.

32

set

2118, 2118IM, 2118IMD Series

12

www.norcold.com

Controls, cont’d.

Temperature Indicator

Mode Button

The mode button is manually operated and does not automatically
change the operating mode of the refrigerator.

Push and hold the Mode button [31] to scroll through the available
modes of operation of the refrigerator, one after the other. When

the desired mode indicator comes on, release the Mode button.
Or push and release the Mode button to change the available

modes of operation one at a time. There are one (1) Automatic and
two (2) Manual Mode of operation.

■ AUTO Mode: The refrigerator controls automatically select the
most efficient energy source that is available.

■ If available, the refrigerator controls select AC electric as the

power choice and the Auto mode AC indicator [281] comes
on (See Fig. 13).

■ If AC electric is not available, the controls select propane
gas as the power choice and the Auto mode propane gas

indicator [282] comes on.

■ MANUAL AC mode: The refrigerator operates using only AC
electric as the power source and the Manual mode AC indicator

[283] comes on.

■ MANUAL GAS mode: The refrigerator operates using only
propane gas as the power source and the Manual mode gas

indicator [284] comes on.

There are nine (9) temperature settings [278] (See Fig.12).

■ Number one (1) is the warmest temperature setting.

■ Number nine (9) is the coldest temperature setting.

Gas Operation

When either AUTO or MANUAL GAS mode is selected, the re­frigerator attempts to ignite the propane gas burner. If unable to

ignite the burner and to maintain a ame, the fault code “no” “FL”

appears in the LCD.

281

set

283

set

Art02493

282

set

284

set

Fig. 13 - Mode Indicators

Temperature Set Button

Push and hold the TEMPERATURE SET button [32] (See Fig.12)

to scroll through temperature settings, one after the other. Release
the TEMPERATURE SET button when the desired temperature
setting appears.

Or push and release the TEMPERATURE SET button to change
the temperature settings, one at a time.

www.norcold.com

13

SERVICE MANUAL

Modes of Operation

WARNING

Test the Gas Safety Valve

Gas Mode

In AUTO GAS mode and MANUAL GAS mode, the controls ener­gize the solenoid coil to open the gas valve. Spring pressure closes

the valve when the controls stop the ow of current to the solenoid

coil.
The propane gas burner will cycle in response to the n tempera-

ture to maintain cabinet temperature.
The controls use an electronic sparker to ignite the propane gas at

the burner.

AC Mode

AUTO AC or MANUAL AC mode operation requires 108 to 132
volts AC. Voltage is to be supplied through a 2 pole, 3-wire, 20

Amp grounding type receptacle.

Two (2) 120 volt AC heaters generate the heat load required for
AUTO AC and Manual AC operation. Each heater is rated for 300
watts @ 120 volts AC. Each heater has a resistance value of 45 to
51 Ohms at ambient temperature. To replace heaters, the refrig-

erator must be removed from the enclosure.

Burn hazard! Allow canister and heaters

!

ATTENTION

The AC electric heaters will cycle in response to the n tempera­ture to maintain the cabinet temperature.

to cool before attempting to remove and
replace.

Lighting Instructions

Before ignition or start up of the refrigerator:

■ Be sure the air ow in the lower intake vent, through the refrig-
erator coils and condenser, and out the upper exhaust vent is
not blocked or decreased.

■ Be sure there are no combustible materials in or around the
refrigerator.

1. Open the valve at the propane gas storage tank.

2. Push and release the ON / OFF button (

3. Push and hold the TEMPERATURE SET button until tem-

perature setting “9” appears.

4. Push the Mode button until the MANUAL GAS mode indica-

tor comes on.

).

To test the gas safety valve:

1. Open the lower intake vent.

2. Remove both white wires from the solenoid of the gas safety
valve on the rear of the refrigerator.

3. Insert volt ohm meter leads into the white wires and set the
meter to read DC volts.

4. Power ON the refrigerator; select MANUAL GAS mode.

5. Verify that the meter reads approximately 12 volts DC and that

the igniter sparks at the burner.

6. After approximately 30 seconds, the voltage measured at the
white wires will be 0 volts DC and the sparking at the burner will

cease. This means that the gas valve safety circuit is operating
correctly. The appropriate error code will appear on the optical
display.

7. Reconnect the white wires to the gas valve solenoid. It does
not matter which wire is attached to which terminal.

8. Close the lower intake vent.

9. Power OFF the refrigerator.

Diagnostic Pre checks

Prior to performing the diagnostic steps called out in the follow-

ing pages; rst do these important diagnostic pre-checks. In most

cases doing so, in and of itself, will remedy the problem at hand.
Make sure:

■ Door is closed and sealing correctly.

■ Unit vents are not blocked.

■ Ambient temperature is not unusually high (more than 110° F. /

43° C.)

■ Verify control panel works properly. The refrigerator is plugged
into a known working AC outlet with a voltage between 108 VAC
and 132 VAC.

■ Extension cords are not being used to supply AC power to the
refrigerator.

■ The refrigerator is connected to a known working DC power

supply and/or battery supplying between 10.5 VDC and 15.4

VDC.

■ Propane gas is available to the refrigerator and is regulated

between 10.5 inches and 11.5 inches w.c. (Inches of Water

Column).

■ The airflow through the intake and exhaust vents is not blocked
and the ventilation baffles are constructed correctly.

2118, 2118IM, 2118IMD Series

14

www.norcold.com

Fault Codes

Blank Display

On-Off Theory of Operation:

Continuous 12-Volts (See Fig.14)

12VDC is supplied to the refrigerator at Power Board terminals

12VDC & GND [A]. This 12VDC travels through the Power Board
to fuse F1 [B] and then out to P1-6 [C]. Via the red-blue wire, the

12VDC exits the Power Board and enters the Display Board at

P1-1 [D]. The 12VDC travels through the Display Board to one side
of the normally open On-Off switch [E]. This 12VDC is referred

to as the continuous 12-volts because it is always present at the
one side of the On-Off switch when 12VDC power is applied to the
refrigerator.

2

P3

1

K3

K1

K4

U1

K5

K2

K6

WH-BK/BC-NR

1

2

35

4

6

P2

POWER BOARD/PANNEAUD’ALMENTATION

BK-NR

K3

K1

K2

BU-BL

F2 8-Amp

F1 5-Amp

B

K6

K5

YL-GN/JN-VE

12VDC/VCD (BAT POS)

12VDC/VCD (BAT NEG)

A

12VDC

GND

12

P4

-

125

K4

-

-

3

-

4

+

+

C

67

+

+

8

+

9

+

10

P1

LIMIT_OUT

LIMIT_IN

AC_HT_HI_2

AC_HT_HI

AC_HT_LO_2

AC_HT_LO

L2

L1

+

RD-YL/RG-JN

RD-BU/RG-BL
RD-YL/RG-JN

BU-BL
BK-NR

D

P1

1

ON-OFF

Vreg

2

3

4

5

MODE

E

P3

MICRO

DISPLAY BOARD /

TEMP

CARTE D’AFFICHAGE

NOR000240A

Fig. 14 - Continuous 12 Volts

Switched 12-Volts (See Fig. 15):
Pressing the On-Off switch [E] will allow 12VDC to pass through

the On-Off switch and back to the Power Board via the blue wire [F]
connected between the Display Board at P1-3 [G] and the Power
Board at P2-3 [H]. Once the 12VDC reaches the Power Board, a
signal is sent out to the coil of relay K3 [J] via the U1 microproces­sor. This signal allows the K3 relay to energize thus closing the
normally open contacts [K].

www.norcold.com

15

SERVICE MANUAL

Fault Codes, cont’d.

NOTICE

NOTICE

2

P3

1

J

K3

K1

K4

U1

K5

K2

K6

WH-BK/BC-NR

1

2

H

35

4

6

P2

POWER BOARD/PANNEAUD’ALMENTATION

BK-NR

BU-BL

K3

K

K1

K2

F2 8-Amp

F1 5-Amp

K5

F

12VDC

GND

12

P4

K6

-

125

K4

-

-

3

-

4

12VDC/VCD (BAT POS)

12VDC/VCD (BAT NEG)

YL-GN/JN-VE

+

+

67

+

+

8

+

9

+

10

P1

+

LIMIT_OUT

LIMIT_IN

AC_HT_HI_2

AC_HT_HI

AC_HT_LO_2

AC_HT_LO

L

RD-YL/RG-JN

BU-BL
BK-NR

G

P1

1

ON-OFF

Vreg

2

3

4

5

MODE

E

P3

MICRO

DISPLAY BOARD /

TEMP

CARTE D’AFFICHAGE

RD-BU/RG-BL

L2

L1

RD-YL/RG-JN

M

NOR000241A

Fig. 15 - Switched 12 Volts

K3 is a latching relay. Once the relay

coil is energized the contacts close and
remain closed even when the 12VDC is

removed, hence the term “latching relay”.
With the K3 contacts now closed, 12VDC

is passed back to the Display Board via

the red-yellow wire [L] between P1-9 of
the Power Board and P1-2 [M] of the

Display Board. This 12VDC will remain at

P1-2 [M] until the latching relay is “un­latched”, which will not take place until the

On-Off button is depressed again. This
12VDC is termed the switched 12-volts
and is used to power ON the display.

The On-Off switch [E] is a momentary

push- button switch. The operation de-

scribed above takes place during the “split
second” the On-Off button is depressed

to power the refrigerator on. If for some
reason the display does not turn on, the
On-Off button can be pushed and held
down to aid in troubleshooting. EXAMPLE:
Verify you have 12VDC between P1-1

(GND) and P1-6 (continuous 12-volts) of

the Power Board. Leave the meters black
ground lead connected to P1-1 and move

the red positive lead from P1-6 to P2-3 of

the Power Board. Have someone press
and hold the On-Off button. You should
measure 12VDC as long as the On-Off

button is held in. When the On-Off button

is released you should see the 12VDC go
away.

2118, 2118IM, 2118IMD Series

16

www.norcold.com

Fault Codes, cont’d.

no AC

WITH BEEPING

ALARM

code

NOR000124A-noac

Meaning:
The Power Board sensed the refrigerators AC input voltage to be

less than 85 volts. This fault, by itself, can only be displayed while

operating in the Manual AC Mode. This fault can be displayed in
conjunction with other faults while operating in the Auto Mode. For
example; no AC followed by no FL (See AUTO mode discussion for
further explanation).

Verify:

■ The refrigerator is plugged into a known working AC outlet sup-

plying a minimum of 85 VAC.

■ The AC power cord is in good operating condition.

■ The glass 8-amp fuse (F2) on the Power Board is intact.

Potter & Brum

T7CS1D2-05

5VDC

05

700514

5A@120VAC

CH

F2

code

code

WITH BEEPING

ALARM

no FL

WITH BEEPING

ALARM

code

Meaning:

The Power Board was not able to detect a ame present at the

burner. This fault, by itself, can only be displayed while operating in

the Manual Gas Mode. This fault can be displayed in conjunction

with other faults while operating in the Auto Mode. For example; no
AC followed by no FL.

Verify:

■ All propane gas shutoff valves (including manual shutoff on gas
valve itself) are open.

■ Propane Gas pressure at refrigerator is 10.5 in. W.C - 11.5 in.

W.C. (water column).

■ Propane gas supply line is free of air.

■ The burner is clean.

■ The electrode-to-burner air gap is between 1/8” and 3/16”.

■ The spark-sense igniter wire is installed correctly and in good
operating condition.

■ Gas valve solenoid is in good operating condition (Coil resis-

tance ≈ 74 Ohms to 92 Ohms).

■ Wires to the gas valve are connected and in good operating
condition.

■ Power Board supplies 12 VDC to gas valve when required.

■ If the above steps all check good, replace power board.

code

code

WITH BEEPING

ALARM

NOR0002142A

NOR000298A

■ The (F2) fuse holder clips are not loose or broken.

■ If above steps all check good, replace power board.

FL --

WITH BEEPING

ALARM

code

NOR000124A---

Meaning:

The gas valve is “mechanically” stuck open and subsequently the
Power Board has sensed a ame present when there should not

be. This fault can be displayed in ANY MODE.

■ Replace the gas valve.

code

code

WITH BEEPING

ALARM

www.norcold.com

17

SERVICE MANUAL

Fault Codes, cont’d.

no AC, no FL

WITH BEEPING

ALARM

code

WITH BEEPING

ALARM

code

NOR000124A-noac_no

Meaning:
This fault is a combination of two separate faults. First, the Power

Board sensed the AC input voltage to be less than 85VAC and
automatically switched to the LP Gas Mode. Secondly, the Power
Board was then unable to detect a ame while operating in the
Auto Gas Mode. This fault can only be displayed while operating in

the Auto Mode.

Verify:

■ Follow the “Verify” instructions for the “no AC” fault and “no FL”.

■ If all the steps listed under Verify the “no AC” and the “no FL”
codes check good, replace power board.

code

code

code

code

WITH BEEPING

ALARM

WITH BEEPING

ALARM

AC HE

WITH BEEPING

ALARM

code

036

NOR000124A-ache

Meaning:
The Power Board sensed the AC heater current to be too low. This

fault can only be displayed while operating in the Manual AC Mode.
Verify:

■ AC heater connections are in good repair and are properly

connected to the Power Board. (Refer to Fig. 17 and Fig. 18

refrigerator wiring diagrams for proper connection.)

■ AC heater resistance measures between 45Ω and 51Ω:

■ No - replace AC heater.

■ Contact Customer Service for further instructions.

code

code

WITH BEEPING

ALARM

oP LI

code

WITH BEEPING

ALARM

NOR000124A-opli

code

code

WITH BEEPING

ALARM

AC rE

WITH BEEPING

ALARM

code

NOR000124A-acre

Meaning:
The AC heater relay contacts of relay K2, on the Power Board, are

stuck closed. This fault can be displayed in ANY MODE.

■ Replace the Power Board.

2118, 2118IM, 2118IMD Series

code

code

WITH BEEPING

ALARM

Meaning:

Refer to the flow chart(s) that are on the next four (4) pages.

18

www.norcold.com

Fault Codes, cont’d.

“LI” “oP” fault code is displayed

on front of refrigerator.

BEGIN

Is

TMC

wired

according to

the wiring diagram/

schematic?

1. Connect or repair connections as needed.

2. If oP LI code clears, the repair is complete.

No

3. If oP LI code remains return to BEGIN process

on this owchart.

Yes

Is there

12 VDC

between the GND

and +12V terminals of

the TMC?

Yes

Is TMC

red light

ashing?

Is there

12 VDC

between the GND

and +12V OUT termi-

nals of the TMC?

Is TMC

red light on

solid? (Tempera-

ture Monitor Control)

No

YesNo

No

Yes

A

Go to TMC RED LIGHT FLASHING on

next page.

B

Go to TMC RED LIGHT SOLID on

page 21.

Replace the

TMC

No

Is there

12 VDC

between the GND

and +12V terminals of

the TMC?

Yes

Yes

Re-

move power

board cover. Is

there 12 VDC between

the TMC GND terminal and

power board LIMIT_IN

terminal?

No

1. Repair blue limit in wire and/or connections as
needed.

2. If oP LI code clears, the repair is complete.

3. If oP LI code remains, return to BEGIN pro-
cess on this owchart.

Remove

power board

cover. Is there 12

No

VDC between the gas valve

bracket and power board

LIMIT_OUT

terminal?

Yes

1. Repair green ground wire and/or connections
as needed.

2. If oP LI code clears, the repair is complete.

3. If oP LI code remains, return to BEGIN pro-
cess on this owchart.

Yes

No

Replace

Power board

Replace

Power board

1. Repair red limit out wire and/or connections
as needed.

2. If oP LI code clears, the repair is complete.

3. If oP LI code remains, return to BEGIN pro-
cess on this owchart.

www.norcold.com

19

SERVICE MANUAL

Fault Codes, cont’d.

Temperature Monitor Control (TMC) - Red Light Flashing

A

From Previous Page

FAST

On/Off 2 to 3 times per

second

The TMC has sensed an open

circuit in the thermocouple circuit

Is thermocouple

plugged into T/C

connector of TMC?

FAST SLOW

Is red light

ashing FAST or

SLOW?

Yes

Replace thermocouple

SLOW

On/Off once per second

The TMC has sensed the input

voltage to be below 9.5 VDC

Plug in thermocouple.

Once plugged in, TMC

will self-recover and

oP LI fault code will be

2118, 2118IM, 2118IMD Series

No

cleared.

20

Make sure input voltage
to TMC +12V terminal is

between 10.5 –15.4 VDC.

Once input voltage is

above 10.0 VDC, High

Temperature Monitor will

self-recover and oP LI

fault code will be cleared.

www.norcold.com

Fault Codes, cont’d.

Temperature Monitor Control (TMC) - Red Light on Solid

B

From Previous Page

Red light on TMC is

ON solid

Inspect for cooling unit

1. Carefully remove insulation canister
and insulation from around boiler
(A).

2. Visually inspect exposed boiler area
for any powdery, yellow residue
indicating leaking chromate (B).

3. Smell around boiler area for
ammonia.

powdery residue

leak.

Is yellow,

visible?

Yes

Yes

No

Can you

smell ammonia?

Removing Insulation

1. Remove the insulation canister (A) and
remove the insulation.

A

REPLACE COOLING

UNIT

NOR000212A-1

2. Inspect for powdery, yellow residue (B).

No

Using litmus paper, inspect boiler area

for leaks.

Did litmus

paper indicate a

leak?

No

C

Go to TMC Lockout State on next

www.norcold.com

page.

Yes

21

Example of Chromate Leaking

B

Red arrows
pointing to yellow,
powdery residue ­indicates chromate
leak

SERVICE MANUAL

Fault Codes, cont’d.

WARNING

NOTICE

NOTICE

C

From Previous Page

Do not attempt this TMC validation unless

!

ATTENTION

Clear the Temperature Monitor Control (TMC) Lockout
State

Clear the TMC lockout state (red light ON solid) shown below to
validate TMC functionality. The TMC is the black box control por­tion of the High Temperature Monitor System.

1. Red light of the TMC is ON (solid).

2. The boiler area of the cooling unit (where the thermocouple

is mounted) has cooled to less than 250° F.

3. A magnet has been positioned as shown in Fig. 16 for ve
(5) seconds.

you have already followed the “TMC Red
Light On Solid” instructions and deter-

mined that the cooling unit does not have
a leak. Otherwise, there is a serious risk

of re that can result in property damage,

personal injury, or death.

In order to clear the lockout state (red light
ON solid), the conditions below must be
met. DO NOT remove the plastic cover of
the TMC.

If lockout state does not clear in ve (5)

seconds, try using a stronger magnet.

Fig. 16 - Magnet position

+12V

634677

T/C

GND

REV E

YELLOW

+12V OUT

NOR000249A

REPLACE COOLING

UNIT

No

Once the TMC lockout

state has been cleared:

1. Run the refrigerator in
AC mode.

2. Monitor operation for

24 hours.

Did the refrigerator cool

properly?

Yes

REPAIR COMPLETE

■ Once the lockout state has been cleared, the red light of the
TMC will turn off.

■ If the refrigerator is not on, turn it on to further validate the TMC

conguration.

Repeated lockouts (red

light ON solid) indicate

potential cooling unit

failure - CONTACT

TECHNICAL SUPPORT

2118, 2118IM, 2118IMD Series

22

www.norcold.com

Fault Codes, cont’d.

WARNING

Sr

WITH BEEPING

ALARM

code

NOR000124A-5r

Meaning:
The Power Board detected an internal fault. This fault can be reset

by powering the refrigerator OFF and back ON. Should this fault
continue to be displayed after being reset, the Power Board should
be replaced. This fault can be displayed in ANY MODE.

Verify:

■ Igniter Spark Sense electrode is not touching the burner
(shorted to ground).

■ Wire from P1-10 (12VDC out to gas valve) is not shorted to
ground.

■ For example, if the wire were to be pinched somewhere and
the insulation covering torn, this would allow the bare wire to
short to ground and this fault will be displayed.

■ If the above steps check good and this error continues, replace
the power board.

Lo dc without alarm while in GAS Mode

WITH BEEPING

ALARM

code

NOR000124A-lodc-woalarnGAS

Meaning:
The refrigerator attempted to ignite or re-ignite the burner when the

DC input voltage was less than 10.0 VDC. The gas valve/igniter

outputs are inhibited when there is a call for cooling and the DC

voltage is less than 10.0 VDC. Should there be a call for cooling
while the DC input voltage is greater than 10.0 VDC and the DC
input voltage then falls below 10.0 VDC, the gas valve will remain

energized and no fault will be displayed. This fault will automatically
reset and the gas valve/igniter outputs will be allowed to operate

once the DC input voltage is >10.5 VDC. This fault can only be
displayed in the Auto and Manual GAS modes.

Verify:

■ That the battery charging equipment of the vehicle is opera-
tional.

■ That the AC/DC converter is operational (if applicable).

■ Contact Customer Service for further instructions.

code

code

WITH BEEPING

ALARM

Lo dc with alarm

Lo dc without alarm

code

Meaning:
The Power Board has determined the DC input voltage is less than

10.5 VDC. Anytime the DC input voltage falls below 10.5 VDC and

the low DC voltage fault is displayed the divider, perimeter, and

apper heaters are turned OFF. This fault can be displayed in ANY

MODE. This fault will be cleared and the divider, perimeter, and

apper heaters will be turned back ON when the DC input voltage
is ≥11.5VDC.

Verify:

■ That the battery charging equipment of the vehicle is opera-
tional.

■ That the AC/DC converter is operational (if applicable).

■ If voltage is within range, replace power board.

Remember that the fault can not be

!

ATTENTION

cleared until the DC input voltage is

≥11.5VDC.

code

code

NOR000124A-lodc-woalarn

code

WITH BEEPING

ALARM

code

code

WITH BEEPING

ALARM

Meaning:

The DC voltage to the refrigerator is less than 8.5 volts DC. All

outputs are inhibited. This fault will automatically reset and outputs
will be allowed to operate once the DC input voltage rises above

9.0 VDC. This fault can be displayed in ANY MODE.

Verify:

■ That the battery charging equipment of the vehicle is opera-
tional.

■ That the AC/DC converter is operational (if applicable).

■ If voltage is within range, replace power board.

www.norcold.com

23

SERVICE MANUAL

Fault Codes, cont’d.

WITH BEEPING

dr

ALARM

code

Meaning:
This fault indicates the optical display board has sensed that one

or both of the fresh food doors have been open for more than
2-minutes. If this fault is displayed, the fresh food interior light will
automatically be turned off. Once both doors are closed, the fault
code will be cleared and the interior light will be allowed to operate.
This fault can be displayed in any mode of operation.

Verify:

■ Both fresh food doors are latching when closed. Adjust the
strike plate if needed.

■ Both latches are operating correctly. Fix or replace handle latch
if necessary.

■ Both doors are aligned correctly. Align doors if necessary.

■ Both doors are not damaged or warped. Replace door if neces-
sary.

■ Light switches turn off light when held closed. If not, replace
switch.

■ Check for worn hinge bushings. Replace if necessary.

■ Check for bent bottom hinges. Replace if necessary.

Flashing temperature setting icon

length of time the heat source outputs (AC heater and propane gas
burner) are energized. The duty cycle, or length of time the cool­ing cycle is regulated, can be manually controlled via the TEMP

SET button. When a colder temperature is desired, changing the
temperature setting to the next “colder” setting will provide addi-

tional cooling by lengthening the cooling cycle. For example, if the

temperature setting is set to 5, adjusting the temperature setting to
the next colder setting of 6 will lengthen the cooling cycle. When a

warmer temperature is desired, changing the temperature setting
to a warmer setting shortens the cooling cycle. For example, if the

temperature setting is set to 4, lowering the setting to 3 will shorten

the cooling cycle.

Verify:

■ The fresh food n thermistor is plugged in and that the connec-
tions are not dirty or broken.

■ Thermistor resistance (Check resistance at thermistor connec-
tor with thermistor packed in ice bath).

Temperature* (°F) Resistance* (k Ω)

85 8.1 - 9.0
80 9.1 - 10.0
75 10.1 - 11.0
70 11.1 - 12.0
60 12.1 - 13.0
50 15.5 - 16.5
40 22.5 - 23.5
35 24.5 - 25.5
33 28.5 - 29.5
32 30.0 - 32.0
* Approximate values

set

NOR000243A

Flashing Temperature Setting ICON

A Flashing Temperature Display means the electronic controls

have sensed the n thermistor to be inoperable. This fault is only
displayed while the optical display is “awake.” To “wake” the display

press and release either the Mode or Temp Set buttons. If there is a
problem sensed with the thermistor the temperature setting icon will

ash ON and OFF. After 10-seconds the control will revert back to
the “sleep” mode. This fault can be displayed in ANY MODE.

Should the thermistor be sensed inoperable the electronic controls
will ignore the thermistor and revert to a BOS mode (Backup Oper­ating System). The BOS mode is an electronically controlled duty
cycle that allows the refrigerator to continue operating until such
time the thermistor can be repaired or replaced.

This duty cycle will maintain refrigerator cooling by controlling the

■ An alternate method would be to use an infrared gun to
measure the n temperature. Then compare that tempera­ture with the temperature indicated on Diagnostic Screen

#3. The temperature difference should be 6° F or less. If

not, thermistor is bad.

2118, 2118IM, 2118IMD Series

24

www.norcold.com

Diagnostic Mode

Individual segment identification:

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 n thermistor temperature, and
screens four (4) and ve (5) display stored fault history.

Screen 2. All Diagnostic Icons OFF

Press the MODE button to bring up screen 2.

NOR000125A-2

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 dened/explained under

each of the individual screen descriptions to follow.

Access Diagnostic Mode

1. Press and hold both the MODE and the Temperature Set but­tons at the same time.

2. Release the MODE and the Temperature Set buttons as soon

as screen

3. A few seconds later,

displays.

set

code

displays.

Change Screens

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

Exit Diagnostic Mode

Screen 2 (Initial view) Screen 2 (Second view)

Screen 2 veries all icons are operational by turning them off

Screen 3. Fresh Food Fin Temperature

Press the MODE button to bring up screen 3.

NOR000125A-3

Screen 3 (Initial view) Screen 3 (Second view)

Screen 3 displays the actual n temperature being sensed by the

thermistor. This is not the fresh food cabinet air temperature.

The example shows the n 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.

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 Diagnos­tic Mode.

Screens and Diagnostic Segments Information

Screen 1. All Diagnostic Icons ON

NOR000125A-1-1

Screen 1 (Initial view) Screen 1 (Second view)

Screen 1 veries all icons are operational by turning them on.

set

code

NOR999125-4

Screen 4 (Initial view) Screen 4 (Second view)

All segments shown as being on.

Screen 4 displays stored fault history using lighted LED segments.
Refer to illustration below for fault history denitions of the indi-

vidual LED segments. If a fault occurred, its assigned fault history

Ignition Fault

1

Door Ajar

AC mode selected
but not available

2

3

DC voltage low

4

DC voltage high

6

5

7

AC relay stuck closed

AC heater failed open

www.norcold.com

25

SERVICE MANUAL

Diagnostic Mode, cont’d.

LED segment will be on.

Individual Segment Identification

1 Ignition fault.
2 Door ajar.
3 DC voltage low.
4 DC voltage high.
5 AC mode selected but not available.
6 AC relay stuck closed.
7 AC heater failed open.

Screen 5. Stored Fault History

Press the MODE button to bring up screen 5.

NOR000125A-5

Screen 5 (Initial view) Screen 5 (Second view)

All segments shown as being on

Screen 5 also displays stored fault history using lighted LED seg­ments. Refer to illustration below for fault history denitions of the

individual LED segments. If a fault occurred, its assigned fault
history LED segment will be on.

Thermistor failure

1

Flame present
with gas off

Service required
error has occured

2

3

Not used

4

5

7

Not used

6

AC voltage has been high

Not used

Press the MODE button to bring up screen 6.

Screen 6 (Initial view) Screen 6 (Second view)

NOR000125A-6

Screen 6 (Third view) Screen 6 (Fourth view)

Screen 6 provides a way to erase fault history from memory. To

erase the fault history:

■ Press and hold the Temperature Set button (approximately ve

(5) seconds) until “CL” shows on the screen.

■ Once “CL” is displayed, release the Temperature Set button.

■ Press and hold Temperature Set button (approximately ve (5)

seconds) until “Er” is displayed again. At this point, the fault his­tory has been cleared on both Screen 4 and Screen 5.

Screen 7. Power Board Inputs

Press the MODE button to bring up screen 7.

Screen 7 (Initial view) Screen 7 (Second view)

All segments shown as being on

NOR000125A-7

Individual Segment Identification

1 Thermistor failure.
2 Flame present with gas off.
3 Not used.
4 Not used.
5 Service required error has occurred.
6 AC voltage has been high.
7 Not used.

Screen 6. Erasing Fault History

2118, 2118IM, 2118IMD Series

Screen 7 displays “live” power board inputs using lighted LED
segments. Refer to illustration below for “live” input denitions of

the individual LED segments. If a power board input is active or
“live,” its assigned input LED segment will be on.

Individual Segment Identification

Food compartment light
is off and door is closed

1

Flame is sensed

Not used

26

2

3

Thermistor is sensing fin temperature

4

Not used

6

5

7

Not used

Not used

www.norcold.com

Diagnostic Mode, cont’d.

1 Food compartment light is off and door is closed.
2 Flame is sensed.
3 Thermistor is sensing fin temperature.
4 Not used.
5 Not used.
6 Not used.
7 Not used.

Screen 8. Power Board Outputs

Press the MODE button to bring up screen 8.

NOR000125A-8

Screen 8 (Initial view) Screen 8 (Second view)

All segments shown as being on

Screen 8 displays “live” power board outputs using lighted LED
segments. The following illustration provides denitions of the
“live” outputs indicated by the individual LED segments. If a power

board output is active or “live,” its assigned output LED seg­ment will be on.

AC heater relay is energized

1

Not used

DC power to
light switch

2

3

DC power to divider heater

4

Gas valve relay is energized

6

5

7

DC power to ignition circuit

Not used

Screen 9. Power Board DC Input Voltage Status

Press the MODE button to bring up screen 9.

NOR000125A-9

Screen 9 (Initial view) Screen 9 (Second view)

All segments shown as being on

Screen 9 displays DC voltage status using lighted LED segments.
Refer to illustration below for denitions of the individual LED seg-

ments. If DC voltage at the power board is within normal range
(10.5 to 15.4 VDC), LED segment 4 will be on.

DC voltage higher than 15.4 volts

1

Not used

Not used

Individual Segment Identification

1 DC voltage higher than 15.4 volts.
2 Not used.
3 Not used.
4 DC voltage normal.
5 Not used.
6 Not used.
7 DC voltage lower than 10.5 volts.

2

3

Not used

4

DC voltage normal

6

5

7

Not used

DC voltage lower than 10.5 volts

Individual Segment Identification

1 AC heater relay is energized.
2 Not used.
3 DC power to divider heater.
4 Gas valve relay is energized.
5 DC power to light switch.
6 DC power to ignition circuit.
7 Not used.

www.norcold.com

Screen 0. Power Board AC Input Voltage Status

Press the MODE button to bring up screen 0.

NOR000125A-0

Screen 0 (Initial view) Screen 0 (Second view)

All segments shown as being on

Screen 0 displays AC voltage status using lighted LED segments.
Refer to illustration below for denitions of the individual LED seg-

ments.

27

SERVICE MANUAL

Diagnostic Mode, cont’d.

AC voltage higher than 132 volts

1

Not used

Not used

2

3

Not used

4

5

7

AC voltage normal

6

Not used

AC voltage lower than 85 volts

Individual Segment Identification

1 AC voltage higher than 132 volts.
2 Not used.
3 Not used.
4 AC voltage normal.
5 Not used.
6 Not used.
7 AC voltage lower than 85 volts.

If AC voltage at the power board is within normal range (108 to
132 VAC), LED segment 4 will be on.

Ice Maker

For information about ice maker operation and troubleshooting,
please refer to the separate Ice Maker Service document.

2118, 2118IM, 2118IMD Series

28

www.norcold.com

Wiring Diagram

Description

PB Power Board
DB Display Board
CW Cold Weather Kit
A AC Heaters
B Light
C Thermistor
D Gas Valve
E Divider Heater
F Perimeter Heater
G Fresh Food Blower
H Temperature Monitor

Control
I External Fans
J * Ice Maker Water Line

Heater
K * Water Valve Heater
L * Dispenser Water Line

Heater
M * Dispenser Water Valve

Heater
N * Water Valve
O * Dispenser Light P.C.B.
P * Dispenser Switch
Q Temperature Switch
R * Temperature Switch
S Divider Heater Housing
T Door Contacts
U Flapper Heater
V Flapper Housing
W Door Switch
X Igniter
Y Freezer Blower
Z Thermocouple
1 Fused Continuous 12

VDC
2 Switched 12 VDC
3 Communications
4 Display Ground
5 Auxiliary Ground
6 Auxiliary +12 VDC
7 Divider +12 VDC
8 Gas Valve +12 VDC
9 Internal Fans Ground
10 Internal Fans +12 VDC
11 Cooling Unit Heater
12 Temperature Switch
F1 5 Amp DC fuse
F2 8 Amp AC fuse
F3 3 Amp DC fuse
* Optional

www.norcold.com

NOR000186A

T1

U1

PB

BK-YL/NR-JN

P2

PB

2

P3

1

F1

K6

K3

K1

K4

K5

K2

K6

RD-BU/RG-BL

1

2

35

4

BU/BL

4

4

6

BK/NR

K4

K5

K3

K1

LIMIT_OUT

LIMIT_IN

AC_HT_HI_2

AC_HT_HI

K2

AC_HT_LO_2

AC_HT_LO

F2

Fig. 17 - Wiring Diagram

12VDC

GND

P4

P1

3

3

L2

L1

1

2

125

3

4

67

8

9

10

RD/RG

BK/NR

GN/VE

-

WH/BC

-

BK/NR

-

WH/BC

-

RD/RG

+

RD-BU/RG-BL

+

+

YL/JN

OR/OR

+

+

RD-YL/RG-JN

WH/BC

+

RD/RG

+

BU/BL

BK/NR

BK/NR

BK/NR

BK/NR

X

X

+12VDC

8

29

10

10

9

9

7

8

10

10

9

9

WH/BC

6

6

12VDC GROUND

D

D

5

5

6

6

1

1

7

2

2

8

A

A

120VAC

RD/RG

BK/NR

Y

Y

-

+

2

1

2

1

RD/RG

G

G

-

+

2

1

2

1

O*

O

2

1

2

1

N*

N

M*

P*

P

WH/BC

BR/BR

R*

R

BR/BR

Q

M

L*

L

K*

K

J*

J

RD/RG

RD/RG

Q

RD/RG

I

I

BK/NR

BK/NR

BK/NR

BK/NR

12

12

11

11

12VDC GROUND

BR/BR BR/BRBK/NR

cw

F3

BK/NR

+12VDC

5

5

F

F

7

7

S

S

RD-BU/RG-BL

GN/VE

RD/RG

BU/BL

+12V IN

H

H

+12V OUT

-

+

YL/JN

RD/RG

Z

Z

BK-YL/NR-JN

1

22

1

+

GND

-

T

E

C

T

E

YL/JN

WH/BC

2

1

2

1

-

+

B

B

C

RD-YL/RG-JN

1

1

V

V

2

2
3

3

U

U

DB

DB

TEMP

MICRO

MODE

P3

ON-OFF

Vreg

P1

2

4

1

5

3

1

1

BU/BL

RD-BU/RG-BL

BK/NR

2

2

3

3

4

4

YL/JN

VT/VT

W

OR/OR

W

W

W

SERVICE MANUAL

Wiring Pictorial

Description

PB Power Board
DB Display Board

A AC Heaters
B Light
C Thermistor
D Gas Valve
E Divider Heater
F Perimeter Heater
G Fresh Food Blower
H Temperature Monitor Control
I External Fans
J * Ice Maker Water Line Heater
K * Water Valve Heater
L * Dispenser Water Line Heater
M * Dispenser Water Valve Heater
N * Water Valve
O * Dispenser Light P.C.B.
P * Dispenser Switch
Q Temperature Switch
R * Temperature Switch
S Divider Heater Housing
T Door Contacts
U Flapper Heater
V Flapper Housing
W Door Switch
X Igniter
Y Freezer Blower
Z Thermocouple
1 Fused Continuous 12 VDC
2 Switched 12 VDC
3 Communications
4 Display Ground
11 Cooling Unit Heater
12 Temperature Switch
F1 5 Amp DC fuse
F2 8 Amp AC fuse
F3 3 Amp DC fuse
* Optional

P1-6

P1-5

2

NOR000187A

O*

O

V

V

P1-1

3

1

1

4

2

234

P3-2

P3-1

DB

DB

4

P2-3

P2-4

W

W

W

W

2

2

P2-6

P2-1

I

I

J* K* L*

J

N

N*

U

L

K

M*

M

U

F

T

+12VDC

12VDC GROUND

12

P1-3

P1-1

+12V OUT

YL/JN

Z

T

+12V IN

+

P1-8

GND

P1-4

5

GND

D

D

P1-2

P1-10

GND

H

H

-

RD/RG

Z

A

A

P*

P

Q

Q

R

R*

P1-6

P1-9

X

X

T1

PB

PB

1

2

35

4

4

6

P2

P1-5

2

+12VDC / +12VCC

2

P3

1

F1 5-Amp

F1

12VDC

GND

P4

P1

LIMIT_OUT

LIMIT_IN

AC_HT_HI_2

AC_HT_HI

AC_HT_LO_2

AC_HT_LO

F2

L2

F2 8-Amp

L1

12VDC GND / -12VCC

1

2

125

3

4

67

8

9

10

S

S

E

E

F

B

B

P1-7

7

Y

Y

G

G

P4-1

9 11

F3

P4-2

11

11

12

12

F3 3-Amp

2118, 2118IM, 2118IMD Series

C

C

Fig. 18 - Wiring Pictorial

30

+12VDC

12VDC GROUND

12VDC GROUND / -12VCC

+12VDC / +12VCC

www.norcold.com