Norcold 2118IM User manual

© 2016 NORCOLD, INC. All rights reserved. Part No. 637026 Rev. B 03.14.2016
Service Manual
Gas Electric Refrigerators
MODELS
2118, 2118SS, 2118BK
Questions? 1-800-444-7210
Improper installation, adjustment, altera-
tion, 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

2
www.norcold.com
2118, 2118IM, 2118IMD Series
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
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
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
FRENCH AND SPANISH TEXT BEGINS ON PAGE 35.

SERVICE MANUAL
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Fig. 1 - Double-wrenching gas ttings
NOR000129A-1
Safety
It is not possible to anticipate all of the conceivable ways or condi-
tions 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
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.
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, altera-
tion, or maintenance of the refrigerator
can cause personal injury, property dam-
age, 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. Dam-
aged connections, piping, and compo-
nents 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 Installa-
tion 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 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 compo-
nents. Most liquids, including leak detec-
tion solutions, are electrically conductive
and pose the potential for an electric
shock hazard, short electrical compo-
nents, damage electronic circuits, and/or
ignite a re.
CAUTION
!
ATTENTION
!
WARNING
ATTENTION
!
WARNING
Do not use leak test solutions that contain
ammonia or chlorine. Ammonia and chlo-
rine degrade copper and brass compo-
nents.
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 am-
monia, 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 re-
move the grounding prong from the refrig-
erator AC power cord. Do not use a two
prong adapter to connect the refrigerator
to the AC outlet.
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 dispos-
ing 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 com-
ponents have sharp corners and edges.
Wear hand protection, such as cut resis-
tant gloves, and exercise extreme care
when handling the refrigerator.
CAUTION
!

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2118, 2118IM, 2118IMD Series
■Recreational Vehicle (RV) Make/Model/Year
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
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
NOTICE
Fig. 3 - Refrigerator information label location
xxxxxxxxxxxxxxxxxxxxxxxxxxx
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D
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I
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N
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E
R
T
I
F
i
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D
NORC OLD
SA
Serial Number
Model Number
x.xx
LBS.
test pressure
xxx VOLTS - AC xx HZ
x.xx AMPS xxx Watts
xx VDC xx HZ
x.x AMPS xx xx Watts
Group Code
Input Pressure
BTUH
Refrigerant
xxxxxxxxxxxxxx xxxxxxxxxxxxx
xxxxxxxxxxxxxxx xxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxx xxxxx
xxxxxxxxxxxxxxxxxxxxx xxxxxx
xxxxxxxxxxxxxxxxxxxxx xxxx
xxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxx xxxxx
xxxxxxxxxxxxxxxxxxxxxxx xx
xxxxxxxxxxxxxxxx xxxxxxxxx
xxxxxxxxxxxxxxxxxx xxxxx
xxxxxxxxxxxxxxxxxx xxxxx
D
E
S
I
G
N
C
E
R
T
I
F
i
E
SA
NORCOLD
x
x
x
x
xx
x
x
x
x
x
x
x
xx
x
x
x
x
x
x
x
x
x
x
x
x
318
312
313
314
315
316 317
Introduction
About This Manual
This service manual provides maintenance, diagnostic, and repair
information for NORCOLD®2118, 2118IM, 2118IMD Series gas ab-
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®reserves the right to make
changes at any time without notice.
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®limited
warranty to be in effect. Installation must also comply with appli-
cable local codes and standards set by the relevant certication
agency.
Replacement Parts
Use only authorized NORCOLD® replacement parts. Generic parts
do not meet NORCOLD® specications for safety, reliability, and
performance. The use of unauthorized aftermarket or generic re-
placement parts voids the refrigerator’s limited warranty coverage.
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]
3Fax: [phone]
8World Wide Web: www.norcold.com.
The following information is required to process technical support
requests:
■Refrigerator Model Number
■Refrigerator Serial Number
■Refrigerator Cooling Unit Serial Number
Fig. 2 - Cooling unit bar code label location.
1167359
NORCOLD
N000036A-1

SERVICE MANUAL
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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
Specications

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2118, 2118IM, 2118IMD Series
Fig. 4 - Exploded front view
Exploded View
No. Description
1 Crisper
2 Crisper Lid
3 Crisper Lid Vent
4 Beverage Bin
5 Beverage Bin Cover
6Crisper 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
NOR000450B
2
4
5
3
6
7
1
9
8
2
3
1
12
16
13
10
15
17
11
14
18
19
20
24
21
22
23
25
26
27
11
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

SERVICE MANUAL
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Fig. 5 - Exploded rear view
Exploded View, cont'd.
No. Description
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
19
17
22
NOR000206A
21
24
18
20
23
23
25
26

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2118, 2118IM, 2118IMD Series
Ventilation
Overview
The installed unit must be completely
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 monox-
ide fumes can cause dizziness, nausea, or
in extreme cases, death.
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:
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 refrig-
erator 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.
ATTENTION
!
WARNING
General Information
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
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.
ATTENTION
!
WARNING
Enclosure
The cabinet that encloses the refrigerator is built by the RV manu-
facturer. Depending on cabinet depth, height, and width certain
bafes may be present when cabinet clearances exceed installa-
tion 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.
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.
9
319
13
12
NOR000201A
179
320
Fig. 6 - Typical roof exhaust venting
Front of RV

SERVICE MANUAL
9
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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.
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.
Ventilation, cont’d.
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.
Be very careful when working on or near
the propane gas system.
■ 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.
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.
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
ATTENTION
!
WARNING
ATTENTION
!
WARNING
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
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
the refrigerator AC power cord. Removal
of this prong can result in a severe electri-
cal shock, as well as voiding the refrigera-
tor’s electrical certication and warranty.
■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.
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 connec-
tions 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.
ATTENTION
!
WARNING

10
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2118, 2118IM, 2118IMD Series
from the enclosure to test the thermostatic
switch. If the vehicle has an upper side-
wall exhaust vent, you are able to test the
thermostatic switch by removing the upper
sidewall vent.
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 compart-
ment 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-
Electrical Connections, cont’d.
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 be-
tween 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 cool-
ing 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 approxi-
mately 1.8 ohms.
The fans are controlled by a thermostatic switch.
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 up-
per 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
NOTICE
Fig. 7 - Thermostatic switch for fans.
NOR000202A
10
322
321
323
■ 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.
This in-line fuse is necessary for added
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
ATTENTION
!
WARNING
Fig. 8 - Movable door seal.
324
Art01813
10

SERVICE MANUAL
11
www.norcold.com
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.
Temperature Monitor Control (TMC)
The purpose of the temperature monitor control is to prevent dam-
age 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.
Electrical Components, cont’d.
Fig. 9 - Temperature monitor control
326
NOR000212A-1
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.
NORCOLD CANNOT ACCEPT RESPONSIBILITY FOR REPAIRS,
ADJUSTMENT, OR MAINTENANCE PERFORMED BY OTHER THAN A
QUALIFIED DEALER OR SERVICE CENTER.

12
www.norcold.com
2118, 2118IM, 2118IMD Series
165
NOR000147A
Fig. 10 - Burner Box Location
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 ( ) for one (1) second to
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.
To avoid possible propane gas leaks, al-
ways use two (2)wrenches to loosen and
tighten the gas supply line at the 3/8 inch
male are tting.
ATTENTION
!
WARNING
Fig. 11 - Burner/Orice Assembly
Art 00956
77 78
79
80
Gas Flame Appearance
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.
The burner box cover can be hot. Wear
gloves to avoid burns.
■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 instruc-
tions. If the flame is not at peak performance after it has been
cleaned, contact Customer Service.
ATTENTION
!
WARNING
5. Remove the are nut from the orice assembly [77] (See Fig.
11).
6. Remove the orice assembly from the burner [78].
When cleaning, do not try to remove the
orice [79] from the orice adapter [80].
Removal will damage the orice and can
cause a propane gas leak. Leaking pro-
pane 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.
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.
ATTENTION
!
WARNING
Controls
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.
Fig. 12 - Control Locations
set
ART 02492
30 31 32
280 278
Art02493

SERVICE MANUAL
13
www.norcold.com
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.
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.
Controls, cont’d.
Fig. 13 - Mode Indicators
ART 02493
set
set
set set
284
282
281
283
Art02493
Temperature Indicator
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 re-
frigerator 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.

14
www.norcold.com
2118, 2118IM, 2118IMD Series
Modes of Operation
Gas Mode
In AUTO GAS mode and MANUAL GAS mode, the controls ener-
gize 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
to cool before attempting to remove and
replace.
The AC electric heaters will cycle in response to the n tempera-
ture to maintain the cabinet temperature.
ATTENTION
!
WARNING
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.
Test the Gas Safety Valve
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.

SERVICE MANUAL
15
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.
Fig. 14 - Continuous 12 Volts
NOR000240A
12VDC
GND
LIMIT_OUT
LIMIT_IN
AC_HT_HI_2
AC_HT_HI
AC_HT_LO
AC_HT_LO_2
L1
L2
41
2
35
6
125 3
4
67
8
9
10
12
K2
K5
K3
K1
K4
F2 8-Amp
F1 5-Amp
-
+
P3
-
-
-
+
+
+
+
+
P2
P1
+
U1
K2 K5 K4 K3
K1
YL-GN/JN-VE
RD-YL/RG-JN
BK-NR
RD-BU/RG-BL
POWER BOARD/PANNEAUD’ALMENTATION
WH-BK/BC-NR
TEMP
ON-OFF MODE
MICRO
Vreg
1
2
3
4
5
P1
P3
DISPLAY BOARD / CARTE D’AFFICHAGE
C
B
D
A
E
BK-NR
BU-BL
BU-BL
RD-YL/RG-JN
12
P4
12VDC/VCD (BAT POS)
12VDC/VCD (BAT NEG)
K6
K6
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 microproces-
sor. This signal allows the K3 relay to energize thus closing the
normally open contacts [K].

16
www.norcold.com
2118, 2118IM, 2118IMD Series
Fig. 15 - Switched 12 Volts
NOR000241A
12VDC
GND
LIMIT_OUT
LIMIT_IN
AC_HT_HI_2
AC_HT_HI
AC_HT_LO
AC_HT_LO_2
L1
L2
41
2
35
6
125 3
4
67
8
9
10
12
K2
K5
K3
K1
K4
F2 8-Amp
F1 5-Amp
-
+
P3
-
-
-
+
+
+
+
+
P2
P1
+
U1
K2 K5 K4 K3
K1
YL-GN/JN-VE
RD-YL/RG-JN
BK-NR
RD-BU/RG-BL
POWER BOARD/PANNEAUD’ALMENTATION
WH-BK/BC-NR
TEMP
ON-OFF MODE
MICRO
Vreg
1
2
3
4
5
P1
P3
DISPLAY BOARD / CARTE D’AFFICHAGE
K
L
E
BK-NR
BU-BL
BU-BL
RD-YL/RG-JN
12
P4
12VDC/VCD (BAT POS)
12VDC/VCD (BAT NEG)
K6
K6
G
M
F
H
J
Fault Codes, cont’d.
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 “un-
latched”, 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.
NOTICE
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.
NOTICE

SERVICE MANUAL
17
www.norcold.com
no AC
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.
■The (F2) fuse holder clips are not loose or broken.
■If above steps all check good, replace power board.
code
WITH BEEPING
ALARM
code
WITH BEEPING
ALARM
code
NOR000124A-noac
Fault Codes, cont’d.
no FL
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
WITH BEEPING
ALARM
code
code
WITH BEEPING
ALARM
NOR0002142A
code
WITH BEEPING
ALARM
code
code
WITH BEEPING
ALARM
NOR000124A---
FL --
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.
Potter & Brum
T7CS1D2-05
5VDC
05
700514
5A@120VAC
CH
NOR000298A
F2

18
www.norcold.com
2118, 2118IM, 2118IMD Series
Fault Codes, cont’d.
no AC, no FL
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
WITH BEEPING
ALARM
code
WITH BEEPING
ALARM
code
WITH BEEPING
ALARM
code
code
WITH BEEPING
ALARM
code
NOR000124A-noac_no
oP LI
Meaning:
Refer to the flow chart(s) that are on the next four (4) pages.
code
WITH BEEPING
ALARM
code
WITH BEEPING
ALARM
code
NOR000124A-opli
AC HE
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.
036
code
WITH BEEPING
ALARM
code
WITH BEEPING
ALARM
code
NOR000124A-ache
AC rE
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.
code
WITH BEEPING
ALARM
code
WITH BEEPING
ALARM
code
NOR000124A-acre

SERVICE MANUAL
19
www.norcold.com
Re-
move power
board cover. Is
there 12 VDC between
the TMC GND terminal and
power board LIMIT_IN
terminal?
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
VDC between the gas valve
bracket and power board
LIMIT_OUT
terminal?
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.
Replace
Power board
Replace
Power board
Fault Codes, cont’d.
“LI” “oP” fault code is displayed
on front of refrigerator.
BEGIN
Is TMC
red light on
solid? (Tempera-
ture Monitor Control)
Is TMC
red light
ashing?
Is
TMC
wired
according to
the wiring diagram/
schematic?
A
Go to TMC RED LIGHT FLASHING on
next page.
B
Go to TMC RED LIGHT SOLID on
page 21.
1. Connect or repair connections as needed.
2. If oP LI code clears, the repair is complete.
3. If oP LI code remains return to BEGIN process
on this owchart.
Is there
12 VDC
between the GND
and +12V terminals of
the TMC?
Is there
12 VDC
between the GND
and +12V OUT termi-
nals of the TMC?
Replace the
TMC
Is there
12 VDC
between the GND
and +12V terminals of
the TMC?
Yes
No
YesNo
Yes
No
Yes
Yes
No
Yes
No
No
No No
Yes
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.

20
www.norcold.com
2118, 2118IM, 2118IMD Series
Temperature Monitor Control (TMC) - Red Light Flashing
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.
FAST
On/Off 2 to 3 times per
second
The TMC has sensed the input
voltage to be below 9.5 VDC
The TMC has sensed an open
circuit in the thermocouple circuit
SLOW
On/Off once per second
Is thermocouple
plugged into T/C
connector of TMC?
Replace thermocouple
Is red light
ashing FAST or
SLOW?
FAST SLOW
A
From Previous Page
Yes
No
Plug in thermocouple.
Once plugged in, TMC
will self-recover and
oP LI fault code will be
cleared.
Fault Codes, cont’d.