Norcold Polar 10 Series User manual

© 2018 NORCOLD, INC. All rights reserved. Part No. 639412 Rev. A 10.21.2019
Service Manual
Gas Electric Refrigerators
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 qualified installer,
service agency, or the gas supplier.
Polar 10 Series (N10LX, NA10LX) Models

2
www.norcold.com
Polar Series N10LX, NA10LX
SAFETY .......................................................................................3
INTRODUCTION..........................................................................4
About This Manual..........................................................................................4
Certification and Code Requirements.............................................................4
About Installation.............................................................................................4
Replacement Parts..........................................................................................4
TechnicalAssistance.......................................................................................4
Model Identification.........................................................................................4
Cooling Unit Serial Number.............................................................................4
Refrigerator Model Number.............................................................................4
Refrigerator Model Number.............................................................................5
Model Number Codes.....................................................................................5
SPECIFICATIONS........................................................................6
GENERAL INFORMATION..........................................................9
Ventilation .......................................................................................................9
Overview.......................................................................................................9
Enclosure......................................................................................................9
Baffles...........................................................................................................9
Lower Intake Vent ........................................................................................9
Exhaust Vent.................................................................................................9
Roof Cap.......................................................................................................9
Propane Gas Connections............................................................................10
Leak Test-Detergent....................................................................................10
Electrical Connections...................................................................................10
120 VoltsAC Electrical Connection.............................................................10
12 Volts DC Electrical Connection..............................................................10
Main Control Board (Power Board) Fuses..................................................11
Electrical Components..................................................................................11
Interior Light................................................................................................11
Divider Heater ............................................................................................11
12 Volt DC Fan............................................................................................11
PREVENTATIVE MAINTENANCE.............................................12
Gas FlameAppearance................................................................................12
LowAmbient Heater (optional)....................................................................12
Freezer Blower and SwitchAssembly (optional).........................................12
Temperature Control System......................................................................12
Backup operating system............................................................................12
Clean the Burner Tube..................................................................................13
CONTROLS - N10LX, NA10LX .................................................14
Power ON / OFF Button................................................................................14
Mode Button..................................................................................................14
Temperature Set Button................................................................................15
Gas Operation...............................................................................................15
Gas Mode......................................................................................................15
AC Mode.......................................................................................................15
Air in the Propane Gas Supply Lines............................................................15
Diagnostic Pre-Checks..................................................................................15
FAULT CODES - N10LX, NA10LX MODELS .........................16
TROUBLESHOOTING - N10LX, NA10LX MODELS ...............17
Fault Code - “no” “FL” withAudibleAlarm.....................................................17
Fault Code - “no” “AC” withAudibleAlarm....................................................19
Fault Code - “AC” “HE” withAudibleAlarm...................................................20
Fault Code - “AC” “rE” withAudibleAlarm.....................................................21
Fault Code - “Lo” “dc”....................................................................................21
Fault Code - “Lo” “dc” withAudibleAlarm .....................................................21
Fault Code - “Lo” “dC” withAudibleAlarm.....................................................21
Fault Code - “HI” “dc” withAudibleAlarm......................................................21
Fault Code - “no” “dt” withAudibleAlarm......................................................22
Fault Code - “Sr” withAudibleAlarm.............................................................23
Fault Code - Flashing Temperature Setting ..................................................24
Blank Display................................................................................................25
Figures
Fig. 1 - Double-wrenching gas fittings...........................................................3
Fig. 2 - Cooling unit bar code label location..................................................4
Fig. 3 - Refrigerator information label location .............................................5
Fig. 4 - Model Number..................................................................................5
Fig. 5 - Exploded front view N10LX, NA10LX Models..................................7
Fig. 6 - Exploded rear view N10LX, NA10LX Models ..................................8
Fig. 7 - Typical roof exhaust venting .........................................................10
Fig. 8 - Fuse locations.................................................................................11
Fig. 9 - Fan wiring.......................................................................................11
Fig. 10 - Freezer blower and switch ..........................................................12
Fig. 11 - Burner tube location .....................................................................13
Fig. 12 - Openings of the burner tube.........................................................13
Fig. 13 - Gas train connection ....................................................................13
Fig. 14 - N10LX, NA10LX user interface (control) locations.......................14
Fig. 15 - Wiring diagram .............................................................................31
Fig. 16 - Wiring pictorial..............................................................................32
Fig. 17 - Fan only wiring..............................................................................33
Fig. 18 - Fan and cold weather heater wiring..............................................33
Fig. 19- Fan and ice maker wiring...............................................................34
Fig. 20 - Fan, ice maker, and cold weather heater wiring...........................34
DIAGNOSTIC MODE - N10LX, NA10LX MODELS...................26
General Diagnostic Information.....................................................................26
Access Diagnostic Mode...............................................................................26
Change Screens...........................................................................................26
Exit Diagnostic Mode....................................................................................26
Screens and Diagnostic Segments Information............................................26
SCREEN 1:All Diagnostic Icons ON ..........................................................26
SCREEN 2:All Diagnostic Icons OFF.........................................................26
SCREEN 3: Fresh Food Fin Temperature ..................................................26
SCREEN 4: Stored Fault History................................................................27
SCREEN 5. Stored Fault History................................................................27
SCREEN 6. Erasing Fault History...............................................................27
SCREEN 7. Power Board Inputs................................................................27
SCREEN 8. Power Board Outputs..............................................................28
SCREEN 9. Power Board DC Input Voltage Status....................................28
SCREEN 0. Power BoardAC Input Voltage Status....................................28
SCREENA..................................................................................................28
SCREEN B..................................................................................................28
COOLING UNIT DIAGNOSTICS - ALL MODELS.....................29
WIRING SCHEMATIC - N10LX, NA10LX MODELS .................31
WIRING PICTORIAL - N10LX, NA10LX MODELS ...................32
AUXILIARY WIRING CIRCUITS................................................33
Fan Only........................................................................................................33
Fan and Cold Weather Heater......................................................................33
Fan and Ice Maker........................................................................................34
Fan, Ice Maker, and Cold Weather Heater....................................................34
ICE MAKER ...............................................................................35
REFRIGERATOR ENCLOSURE ...............................................35
Remove the Refrigerator...............................................................................35
Replace the Refrigerator...............................................................................35
Conduct Leak Test ........................................................................................36
■La version française commence à la page 37
■La versión en español comienza en la página 73
CONTENTS

SERVICE MANUAL
3
www.norcold.com
This refrigerator is equipped to use only
ULP gas and can not be changed to use
any other fuels (natural gas, etc.).
Incorrect installation, adjustment, changes
to, or maintenance of this refrigerator can
cause personal injury, property damage,
or both.
Obey the instructions in this manual when
installing the intake and exhaust vents.
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.
ULP gas can cause a fire or an explo-
sion that can result in property damage,
personal injury, or death. Do not smoke or
create sparks while doing any work on the
ULP gas supply system.
Do not use an open flame to examine the
gas supply piping or fittings for leaks.
Make sure the electrical installation
conforms to all applicable codes. See the
“Certification and Code Requirements”
section of the “Installation and Owner’s
Manual.”
Disconnect both the AC and DC power
sources before doing any maintenance
work on the refrigerator.
Do not bypass or change the refrigerator’s
electrical components or features.
Do not use an open flame for leak testing
any of the ULP gas system components.
ULP gas is highly flammable and explo-
sive.
ATTENTION
!
WARNING
Do not spray liquids near electrical outlets,
connections, or the refrigerator compo-
nents. Many liquids conduct electricity
which can cause a shock hazard, electri-
cal shorts, and in some cases fire.
The refrigerator cooling system is un-
der pressure. Do not try to repair or to
recharge a defective cooling system. The
cooling system contains sodium chromate.
Breathing certain chromium compounds
can cause cancer. The cooling system
contents can cause severe skin and eye
burns, and can ignite and burn with an
intense flame. Do not bend, drop, weld,
move, drill, puncture, or hit the cooling
system.
Storing flammable materials behind or
around the refrigerator creates a fire
hazard. Do not use the area behind the
refrigerator to store flammable materials
(e.g. gasoline and cleaning supplies)
Do not remove the round ground prong
from the refrigerator AC power cord. Do
not use a two prong adapter or extension
cord on the AC power cord.
A circuit overload can result in an elec-
trical fire if the wires and/or fuse sizes
are not correct. Use only the wire and
fuse sizes listed in the “Installation and
Owner’s Manual”.
To prevent child entrapment, make sure
all shelf retainers are correctly fastened
and remove the doors before disposing of
the refrigerator.
To avoid possible ULP gas leaks, always
use two wrenches to tighten or loosen the
gas supply line connections. Make sure all
fasteners and connections are tight.
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 flammable
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 identifies
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.
CAUTION
!
ATTENTION
!
WARNING
SAFETY
Fig. 1 - Double-wrenching gas fittings
NOR000129A-1
The rear of the refrigerator has sharp edg-
es and corners. To prevent cuts or abra-
sions when working on the refrigerator, be
careful and wear cut resistant gloves.
Make sure all hardware, such as hinges
and fasteners (i.e., retaining screws), is
properly fastened.
CAUTION
!

4
www.norcold.com
Polar Series N10LX, NA10LX
About This Manual
This service manual provides maintenance, diagnostic, and repair
information for NORCOLD®N10XL and NA10XL 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, liquefied petroleum (LP) gas–propane–
systems, and AC/DC electrical systems as installed in a variety of
recreational vehicles (RV).
All information, illustrations, and specifications 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.
Certification and Code Requirements
NORCOLD®gas/electric absorption refrigerators are certified
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 N10XL and NA10XL
Series Installation Manual for the NORCOLD®limited warranty
to be in effect. Installation must also comply with applicable local
codes and standards set by the relevant certification agency.
Replacement Parts
Use only authorized NORCOLD®replacement parts. Generic parts
do not meet NORCOLD®specifications 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]
Fax: [phone]
World Wide Web: www.norcold.com.
INTRODUCTION
Fig. 2 - Cooling unit bar code label location.
1167359
NORCOLD
N000036A-1
The following information is required to process technical support
requests:
■Refrigerator Model Number
■Refrigerator Serial Number
■Refrigerator Cooling Unit Serial Number
■Recreational Vehicle (RV) Make/Model/Year
Model Identification
■N10LX and NA10LX models are 2-way refrigerators that operate
on AC power or propane gas.
■Letter(s) appended to the model number identify factory in-
stalled accessories.
Cooling Unit Serial Number
The cooling unit serial number appears on the cooling unit bar code
label. The label is affixed 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
NOTICE

SERVICE MANUAL
5
www.norcold.com
Introduction, cont’d.
Model Number Codes
Explanation
1
N = Norcold
2
X = Sequence number indicating
custom features / aftermarket XA/
3
3 =Approximate storage volume in
cubic feet
4
X = Sequence number indicating
custom features
5
Blank = 2-Way Model
.3 = 3-Way Model
6
Blank = Without icemaker
IM = With icemaker
7
LowAmbient Operation:
Blank=Not Equipped
C=Is Equipped
8
Door design:
Blank = Insert panel
SS=Stainless steal wrapped BK=Black
wrapped
WH=White wrapped
WPM=Pewter Royce wrapped
9
Fan:
Blank=No fan
F = Equipped (1 Fan)
F2 = Equipped (2 Fans)
J = Equipped (1) High Velocity Fan
10
Door swing:
L= Left-hand door swing
R = Right-hand door swing
11
P=Black acrylic door panels
12
Packaging Type:
Blank=Corrugated packaging
T = Returnable packaging
M4 = 4-unit multi-pack
M6 = 6-unit multi-pack
M8 = 8-unit multi-pack
NX3X.3IMCBKFRPT
xxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxx
D
E
S
I
G
N
C
E
R
T
I
F
i
E
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
A
C
B
D
Fig. 3 - Refrigerator information label location
x
x
x
x
xx
x
x
x
x
x
x
x
xx
x
x
x
x
x
x
xx
x
x
x
x
E
EF
G
A Serial Number
B Model Number
C Group Code
D BTU / h
E Amount of refrigerant in cooling system
F AC Voltage /Amperage
G DC Voltage /Amperage
Refrigerator Model Number
Fig. 4 - Model Number

6
www.norcold.com
Polar Series N10LX, NA10LX
N10LX, NA10LX Models - Electronic
■Capacitive Touch - ON/OFF, Mode, and Temperature Set
■Backlit LCD Display with Icon, Numerical, and Text Indicators
■Self-Diagnostic with Fault Codes
■2-Way Automatic or Manual Operation (Standard)
■Nine (9) Separate Temperature Settings (With Backup Operating System Mode)
■Sleep Mode
■Twelve (12) Individual Diagnostic Screens
Rough Opening Dimensions (H x W x D)
N10LX, NA10LX Models ------------------------------------------59.88 - 60.01 in.x 23.50 - 23.63 x 24.00 - 24.13 in.
DC (Direct Current) Specifications
Electronic Controls DC Input Voltage Requirement----------------------------------------------10.5 VDC to 16.0 VDC
DC Fuse Requirements
Main Control Board (Power Board) F1 - Control Circuit----5 Amp, 32 V, MINI ® Blade, Automotive Style Fuse
Main Control Board (Power Board) F2 - Auxiliary Circuit7.5 Amp, 32 V, MINI ® Blade, Automotive Style Fuse
DC Resistance / Amperage Ratings
Divider Heater -----------------------------------------------------------------43 Ωto 50 Ω, 240 mA to 279 mA @ 12 VDC
Cold Weather Heater (optional) --------------- ------------------------------- 6.7 Ωto 7.8 Ω, 1.5 A to 1.8 A @ 12 VDC
Ice Maker Water Line Heater (IM models only) --------------------------- 6.7 Ωto 7.8 Ω, 1.5 A to 1.8 A @ 12 VDC
External Cooling Fan------------------------------------------------------------------------------------------430 mA @ 12 VDC
Interior Light----------------------------------------------------------------------------------------------------------------- 180 mA
AC (Alternating Current) Specifications
Electronic Controls AC Input Voltage Requirement ------------------------------------------------ 108 VAC to 132 VAC
AC Fuse Requirements
Power Board F3---------------------------------------------------------- 8 Amp, 250 V Glass FST 5 x 20 mm GMA Type
AC Current Draw
AC Heater----------------------------- 1 each, 300 W @120 VAC, (45.7 Ωto 50.5 Ω), 2.38 A to 2.63 A @ 120 VAC
Ice Maker Water Valve (IM models only)-------------------------------------------------------------------10 W @ 120 VAC
Propane gas
Operating Pressure------------------------------------------------------------------------------10.5 - 11.5 Inch w.c.
Burner Rating (Heat output)--------------------------------------------------------------------------1750 Btu/h @ 11 in. w.c.
Burner Orifice Size ---------------------------------------------------------------------------------------LP18 (not replaceable)
Gas Ignition---------------------------------------------------------------------------------------Electronic with Flame Sensing
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
SPECIFICATIONS

SERVICE MANUAL
7
www.norcold.com
No. Description
A Hinges
B Side Trim Piece / Foam Tape Assembly
C Ice Cube Tray
D Freezer Wire Shelf
E User InterfaceAssembly (Control Assembly)
F User Interface Housing (Control Housing)
G Full Wire Shelf
H Cut Out Wire Shelf
I Crisper Cover
J Crisper
K Clamp
L Hinge Hole Cover
M Strike Plate
N Top Trim Piece
O Bottom Trim Piece
P Interior Light LEDAssembly
Q Thermistor
Fig. 5 - Exploded front view
N10LX, NA10LX Models
L
M
K
NOR000824A
Specifications, cont’d.
B
NAB
C
D
P
E
Q
F
H
G
J
I
O

8
www.norcold.com
Polar Series N10LX, NA10LX
No. Description
R Cooling Unit
S Fins
T AC Heater
U Gas TrainAssembly
V Gas Train Support Bracket / Burner DoorAssembly
W Drip Cup
X AC Power Cord
Y Main Control BoardAssembly (Power Board Assembly)
Z Fan
Fig. 6 - Exploded rear view
N10LX, NA10LX Models
Exploded Views - N10LX, NA10LX MODELS, cont’d.
NOR000825A
S
R
Z
Y
X
W
U
V
T

SERVICE MANUAL
9
www.norcold.com
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 flue 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.
Certified 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 certification 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 floor level. This allows any leaking propane gas to escape to
the outside and not to collect at floor level.
American Gas Association/Canadian Gas Association (AGA/CGA)
certification allows the refrigerator to have zero (0) inch minimum
clearance at the sides, rear, top, and bottom. While there are no
maximum clearances specified for certification, the following maxi-
mum clearances are necessary for correct refrigeration:
Bottom 0 inch min. 0 inch max.
Each Side 0 inch min 1/2 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 flow is blocked or decreased, the refrigerator may not cool
correctly.
Each NORCOLD model is certified by AGA and CGA for correct
ventilation.
ATTENTION
!
WARNING
To confirm 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 flange and cut-out
opening.
■Installed on a solid floor (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 conflict 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
baffles may be present when cabinet clearances exceed installa-
tion guidelines and specifications.
Baffles
Baffles prevent hot air buildup “pocketing” between the refrigerator
cabinet and the enclosure walls and/or ceiling. An enclosure may
be fitted with:
■An absorber baffle and a condenser baffle
■Side baffles (Fig. 7, A)
■Vertical top baffle (Fig. 7, B)
■Vertical angled baffles
■Box baffle
■Or a combination of any of the above.
For complete detail about any necessary baffle(s), refer to the
refrigerator Installation Manual.
Lower Intake Vent
Ventilation and combustion air flow through the lower intake vent
(Fig. 7, C), which also serves as the service access or door. The
lower intake vent needs be kept clear of obstructions that may
restrict the flow of fresh air into the enclosure.
Exhaust Vent
Warm air and combustion gases flow out of the enclosure through
the exhaust vent. The exhaust vent can be either a roof exhaust
vent (Fig. 7, D) 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 (Fig. 7, E) fits over exhaust vent. The sloped end
always faces the front of the RV. It is held in place by four (4) 2-1/2”
long Phillips head screws.
GENERAL INFORMATION

10
www.norcold.com
Polar Series N10LX, NA10LX
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 flame near the propane gas
system.
■Do not use an open flame 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
!
WARNING
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 fire.
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.
■Follow the “Conduct Leak Test” process in this manual.
ATTENTION
!
WARNING
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 cord must be routed so as
not to come in contact with the burner cover, flue 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 certification 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 flue
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 16.0 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 “12 VDC” 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.
ATTENTION
!
WARNING
General Information - Ventilation, cont’d.
Fig. 7 - Typical roof exhaust venting
A Side Baffles
B Vertical Top Baffles
C Lower Intake Vent
D Roof Exhaust Vent
E Roof Cap
NOR000843A
B
Front of RV
D
E
A
C

SERVICE MANUAL
11
www.norcold.com
12 Volt DC Fan
A 12 volt DC fan (Fig. 9, A) increases ventilation of the cooling
system. The fan is located near the condenser on the rear of the
cooling system foam plug. Fan resistance through the fan motor
circuit is approximately 1.8 ohms.
The fan is unidirectional and is controlled by a thermostatic switch
(Fig. 9, B).
The thermostatic switch is located on the first condenser fin (Fig. 9,
C).
The switch turns the fan on and off. The fan comes on when the
temperature of the first condenser fin is about 130° F (54.4° C) and
turn off at about 115° F (46°C).
The DC power is supplied by an auxiliary wire harness (Fig. 9, D)
through to connector pins P1-1 (Fig. 9, E) and P1-6 (Fig. 9, F).
If the vehicle has a roof exhaust vent,
you may need to remove the refrigerator
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.
NOTICE
Electrical Components
Interior Light
The interior light is located in the top of fresh food compartment.
The light remains on at all times while the refrigerator is ON.
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
main control board (power board).
Main Control Board (Power Board) Fuses
There are three (3) fuses located on the Main Control Board (Pow-
er Board). Two (2) are MINI ® Blade, Automotive Style Fuses used
to protect DC voltage circuits (F1 and F2) and one (1) is a glass
body cartridge style fuse (F3) used to protect AC voltage circuits.
Fuse F1
This is a DCV, 5-Amp, 32V, MINI ® Blade, Automotive Style Fuse.
It is used to protect the DC circuitry / components located on the
Main Control Board (Power Board).
Fuse F2
This is a DCV, 7.5 Amp, 32V, MINI ® Blade, Automotive Style Fuse.
It is used to protect DC “loads” connected to the auxiliary output of
the Main Control Board (Power Board). Examples of these loads
are: External cooling fan, waterline heaters, etc.
Fuse F3
This is an ACV, 8 Amp, 250 V, Glass Body Cartridge, FST 5x20
mm, Automotive Style Fuse. It is used to protect the AC circuitry /
components located on the Main Control Board (Power Board).
Fig. 8 - Fuse locations
NOR000815A
F2
F3 F1
Fig. 9 - Fan wiring
A Fan
B Thermostatic Switch
C Condenser
D Auxiliary Wire Harness
E P1-1Auxiliary 12 VDC (ground)
F P1-6Auxiliary 12 VDC (positive)
General Information - Electrical Connections, cont’d.
NOR000793A
11 10 9
5438 7621
1213141516
P1
A
D
F E
C
B

12
www.norcold.com
Polar Series N10LX, NA10LX
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 and clean the burner tube.
■Check/adjust the spark electrode gap to 1/8 - 3/16 inch.
■Make sure the spark electrode tip is clean and that the spark
electrode is securely attached to the gas train assembly.
■Check/adjust AC and DC voltages and propane gas supply
pressure.
■Check the gas safety valve (see procedure in this manual).
■Make sure that area around the burner and controls is free of
debris, 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.
Gas Flame Appearance
While in propane gas operation, examine the appearance of the
gas flame:
If the flame appears at any of the open-
ings of the burner tube other than the
slots, the inside of the burner tube is
obstructed. Clean the burner tube.
1. Change the refrigerator controls to the coldest temperature
setting.
2. Open the lower intake vent.
The burner door can be hot. Wear gloves
to avoid burns.
3. Open the burner door and look at the gas flame:
■The flame should be a darker blue inside and a lighter blue
outside and should be a constant and steady shape.
■The flame should not be yellow and should not have an er-
ratic and unstable shape.
■Make sure the flame does not touch the inside of the flue
tube.
4. Close the burner door.
5. Clean the burner tube as part of routine maintenance. Fol-
low the instructions in the “Clean the Burner Tube” topic in
this manual If the flame is not at peak performance, after the
burner tube is cleaned, contact Customer Service.
ATTENTION
!
WARNING
ATTENTION
!
WARNING
Low Ambient Heater (optional)
Some models are factory equipped with a low ambient heater.
This supplies DC voltage to the heater any time the ambient tem-
perature is low enough. Extended storage during cold weather will
drain the vehicle batteries. To prevent battery drain, remove the 3
Amp fuse from the low ambient heater.
Freezer Blower and Switch Assembly (optional)
All ice maker models are equipped with an ON/OFF switch on the
freezer compartment blower. The switch is factory set to the ON
position. This provides the most ice production. The owner may
choose to turn the blower switch OFF, which will eliminate the
blower noise and also reduce the ice production.
■With the switch in the ON position, the blower will run continu-
ally.
■With the switch in the OFF position, the blower will not run.
If DC voltage is present through the wire harness to the switch
and the switch will not turn the blower ON/OFF, replace the freezer
blower and switch assembly.
Electrical Components cont’d.
Fig. 10 - Freezer blower and switch
A Freezer Blower
B Switch
B
A
NOR000852A
Temperature Control System
Although the refrigerator is not frost-free, it is made to limit frost on
the cooling fins. At regular intervals, the temperature control sys-
tem automatically melts most of the frost from the cooling fins. The
water from the cooling fins drains into a collection cup attached to
the back of the refrigerator. The heat of the cooling system evapo-
rates the water from the collection cup.
Backup operating system
This refrigerator has a backup operating system. The backup
operating system allows the refrigerator to continue to cool if the
thermistor of the refrigerator should fail.
If this failure occurs:
■The refrigerator automatically changes to the backup operating
system.
■In ANY mode, the temperature setting will flash ON and OFF for
10 seconds when the control is “awake”
■The backup operating system can over-freeze or thaw the con-
tents of the freezer and the fresh food compartment.
■Make sure the temperatures of the freezer and the fresh
food compartment are satisfactory.

SERVICE MANUAL
13
www.norcold.com
Fig. 12 - Openings of the burner tube
NOR000683A
Air
Air
Air Air
A Gas TrainAssembly
B Screws
C Gas Train Support Bracket / DoorAssembly
Fig. 11 - Burner tube location
NOR000683A-1
A
BC
Clean the Burner Tube
Clean the burner tube annually. To clean:
1. Close the valve at the vehicle propane gas tank(s).
2. Touch and hold the ON/OFF button ( ) for one (1) second to
turn the refrigerator off.
3. Open the lower intake vent.
4. Disconnect the two (2) white wires from the gas train assembly
(Fig. 11, A).
To avoid possible propane gas leaks,
always use two (2) wrenches to loosen
and tighten the gas supply line at the gas
train assembly.
5. Disconnect the gas supply line from the gas train assembly.
6. Remove the two (2) screws (Fig. 11, B) that attach the gas
train support bracket/door assembly (Fig. 11, C) to the cooling
unit.
Never attempt to operate the gas train
when it is NOT installed in the cooling unit
because of the risk of electrical shock.
7. Remove the gas train assembly from the cooling unit.
When cleaning, do not try to remove
the burner. Removal may can cause a
propane gas leak. Leaking propane gas
can ignite or explode and result in danger-
ous personal injury or death. Do not try to
clean the burner with anything other than
compressed air.
8. Clean the burner tube with compressed air only. Blow air into
the openings of the burner tube to remove any dirt or obstruc-
tions from the inside of the burner tube.
9. Put the gas train assembly back onto the cooling unit.
10. Attach the gas train support bracket/door assembly to the cool-
ing unit.
11. Connect the gas supply line to the gas train assembly.
■Hand thread the gas supply line fitting onto the gas train
assembly until it is finger-tight.
■Apply timing marks to the gas supply line fitting and the gas
train assembly.
■Use the double wrench technique to avoid twisting the
frame of the gas train assembly. If the gas train assembly
becomes bent or twisted, it MUST be replaced.
Always use two (2) wrenches to tighten
or loosen propane gas connections.
Damaged connections, piping, and
components create the potential for gas
leaks.
■Using two (2) wrenches, tighten to 1/8 of a turn more.
12. Connect the two (2) white wires to the gas valve of the gas
train assembly.
13. Open the valve at the vehicle propane gas tank(s).
14. Examine all of the gas connections for leaks.
ATTENTION
!
WARNING
ATTENTION
!
WARNING
ATTENTION
!
WARNING
ATTENTION
!
WARNING
ATTENTION
!
AVERTISSEMENT
ATTENTION
!
ADVERTENCIA
ATTENTION
!
DANGER
Preventative Maintenance, cont’d.
Fig. 13 - Gas train connection
BC
A
BC
A
A Gas Supply Line Fitting
B Gas TrainAssembly
C Timing Marks

14
www.norcold.com
Polar Series N10LX, NA10LX
No. Description
A Power ON / OFF Button
B Mode Button
C Temperature Set Button
D LCD Display
E AUTO Mode Indicator
F AC Mode Indicator
G GAS Mode Indicator
Power ON / OFF Button
Touch and release the Power ON / OFF button (See Fig. 14, A) to
turn on the refrigerator.
Touch and hold the Power ON / OFF button for one (1) second to
turn off the refrigerator.
Mode Button
The mode button is manually operated and does not automatically
change the operating mode of the refrigerator.
Touch and hold the Mode button (See Fig. 14, B) 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 touch 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 Modes of operation.
■AUTO Mode: The AUTO Mode indicator (See Fig. 14, E) comes
on and the refrigerator controls automatically select the most
efficient energy source that is available.
■The first choice of operation is AC electric. If available, the
refrigerator controls select AC electric as the power choice
and the AC mode indicator comes on also (See Fig. 14, F).
• If AC electric is not available to the refrigerator, if the AC
electric is outside the permitted operating range, or if the
AC heater does not operate, the electronic controls of the
refrigerator automatically change to the second choice of
operation.
■The second choice of operation is propane gas. If AC
electric is not available, the controls select gas as the power
choice.
• If unable to establish and maintain a flame, a “no” FL” fault
code shows on the LCD display (See Fig. 14, D). Refer to
the “Fault Codes” section.
■MANUAL AC mode: The refrigerator operates using only AC
electric as the power source and the AC mode indicator (See
Fig. 14, F) comes on.
■MANUAL GAS mode: The refrigerator operates using only gas
as the power source and the GAS mode indicator (See Fig. 14,
G) comes on.
Fig. 14 - N10LX, NA10LX user interface (control)
locations
NOR000649A-1
CONTROLS - N10LX, NA10LX
AUTO
NORCOLD
MODE
set
CODE
FG
ABED C

SERVICE MANUAL
15
www.norcold.com
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.
A 120 volt AC heater generates the heat load required for AUTO
AC and Manual AC operation. To replace the heater, the refrigera-
tor must be removed from the enclosure.
Burn hazard! Allow canister and heaters
to cool before attempting to remove and
replace.
The AC electric heater will cycle in response to the fin temperature
to maintain the cabinet temperature.
Air in the Propane Gas Supply Lines
For safety reasons, the refrigerator elec-
tronic controls are designed so that while
operating in Propane Gas Mode, the trial
for ignition (the maximum time that the
gas valve and the igniter can be left on
without a flame present) is limited to 30
seconds. When starting the refrigerator
for the first time, after storage, or after
replacing the propane gas tanks(s), the
propane gas supply lines can have air in
them.
Due to the air in the gas supply lines, the
burner may not ignite within the 30 second
time limit. If this happens, the gas valve
and igniter outputs will be turned off, the
propane gas mode will be “locked out”,
and the appropriate fault code will show in
the display.
The gas lock out condition can be reset
by powering the refrigerator OFF and
back ON, at which time a new 30 second
trial for ignition will begin. You may need
to repeat this procedure several times to
remove all of the air from the gas supply
lines.
Diagnostic Pre-Checks
Diagnosing fault codes begins by starting with the basics. In many
cases, the problem can be solved by verifying that the refrigerator
is operating in acceptable conditions. Make sure that:
■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 and
16.0 VDC
■Propane gas is available to the refrigerator and is regulated
between 10.5 and 11.5” WC (Inches of Water Column).
ATTENTION
!
WARNING
NOTICE
Temperature Set Button
Touch and release the Temperature Set button (See Fig. 14, C) to
view the current temperature setting.
There are nine (9) temperature settings which appear as numbers
in the LCD display.
■Number one (1) is the warmest temperature setting.
■Number nine (9) is the coldest temperature setting.
Touch and hold the Temperature Set button to scroll through tem-
perature settings, one after the other. Release the Temperature Set
button when the desired temperature setting appears.
Or touch and release the Temperature Set button to change the
temperature settings, one at a time.
Gas Operation
When either AUTO or MANUAL GAS mode is selected, the refrig-
erator attempts to ignite the propane gas burner. If unable to ignite
the burner and to maintain a flame, the fault code “no” “FL” appears
in the LCD display.
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 flow of current to the solenoid
coil.
■The propane gas burner will cycle in response to the fin tem-
perature to maintain cabinet temperature.
■The controls use an electronic sparker to ignite the propane gas
at the burner.
Controls, cont’d.

16
www.norcold.com
Polar Series N10LX, NA10LX
FAULT CODES - N10LX, NA10LX MODELS
Fault Code Fault Code Meaning Action to
Take
The burner did not ignite or re-ignite. Refer to “Fault Code - “no”
“FL” withAudible Alarm” on
page 17.
AC voltage is not available to the refrigerator. Refer to “Fault Code - “no”
“AC” withAudible Alarm” on
page 19.
AC heater fault. Refer to “Fault Code - “AC”
“HE” withAudible Alarm” on
page 20.
AC heater relay stuck on. Refer to “Fault Code - “AC”
“rE” withAudible Alarm” on
page 21.
DC input voltage to the refrigerator is low. Cooling is to
continue. Refer to “Fault Code - “Lo” “dc”” on page 21’
DC input voltage to the refrigerator is too low. GAS MODE is
inhibited. The refrigerator is not cooling. Refer to “Fault Code - “Lo” “dc” withAudible Alarm” on
page 21.
DC input voltage to the refrigerator is too low. All MODES
are inhibited. Refer to “Fault Code - “Lo” “dC” withAudible Alarm” on
page 21.
DC input voltage to the refrigerator is too high. Refer to “Fault Code - “HI”
“dc” withAudible Alarm” on
page 21.
Communications between the controls have been lost. Refer to “Fault Code - “no”
“dt” withAudible Alarm” on
page 22.
This fault is within the refrigerator controls. Refer to “Fault Code - “Sr”
withAudible Alarm” on
page 23.
This fault is within the refrigerator controls. Refer to “Fault Code - “oP”
“LI” withAudible Alarm” on
page 23.
Aflame is sensed at the burner when there should be none
present. Refer to “Fault Code - “FL” “- -” withAudible Alarm” on
page 23.
The thermistor has been sensed as inoperable, so the tem-
perature is being controlled via backup operating system. Refer to “Fault Code - Flashing Temperature Set-
ting” on page 24.
The refrigerator will not turn ON. Refer to “Blank Display” on
page 25.
CODE CODE
Alternately flashes “no” and “FL”
with an audible alarm.
CODE CODECODE CODE
Alternately flashes “no” and “AC”
with an audible alarm.
CODE CODE
Alternately flashes “AC” and “HE”
with an audible alarm.
CODE CODE
Alternately flashes “AC” and “rE”
with an audible alarm.
CODE CODE
Alternately flashes “Lo” and “dc”.
CODE CODE
Alternately flashes “Lo” and “dC”
with an audible alarm.
CODE CODE
Alternately flashes “HI” and “dc”
with an audible alarm.
set
CODE
Flashes “Sr” with an audible alarm.
CODE CODE
Alternately flashes “oP” and “LI”
with an audible alarm.
CODE CODE
Alternately flashes “no” and “dt”
with an audible alarm.
CODE CODE
Alternately flashes “Lo” and “dc”
with an audible alarm.
CODE CODE
Alternately flashes “FL” and “--”
with an audible alarm.
set
Temperature setting flashes on/off at one (1)
second intervals any time the user interface
(control) is “awake”.
Blank display.

SERVICE MANUAL
17
www.norcold.com
TROUBLESHOOTING - N10LX, NA10LX MODELS
Possible Cause:
No flame is sensed present at the
burner when there should be one.
The burner did not ignite or re-ignite.
This fault can occur in AUTO MODE or
MANUAL GAS MODE
Fault Code - “no” “FL” with Audible Alarm
CODE CODE
Alternately flashes “no” and “FL”
with an audible alarm.
Before starting this procedure:
■Make sure that the valve of the RV propane gas tanks) is open.
■Make sure that the manual shut-off valve of the gas train as-
sembly is open.
■Make sure that the propane gas pressure to the refrigerator is
10.5 inches W.C.
YES
Clean burner.
NO
Is burner clean?
YES
Correct gap.
NO
Is burner/
electrode gap
1/8”-3/16”?
YES
Correct. Replace spark / sense
ignitor wire if needed.
NO
Spark/sense
wire installed
correctly w/
continuity?
YES
Replace gas train assembly.
NO
Gas valve
solenoid coil
resistance
74-92 Ohms?
Continued on following page.

18
www.norcold.com
Polar Series N10LX, NA10LX
Continued from previous page.
YES
Replace main control board assembly
(power board assembly).
NO
Does
main control
board (pwr board)
supply 12VDC to
gas train?
Replace Gas Train.
YES
YES
Correct. Replace wires if needed.
NO
Wires to gas
valve connected
w/continuity?
Troubleshooting - N10LXAND NA10LX Models, cont’d.

SERVICE MANUAL
19
www.norcold.com
Possible Cause:
There is no AC power to the refrigerator.
Fault Code - “no” “AC” with Audible Alarm
Before starting this procedure:
■Make sure that no other problems exist with the vehicle’s AC
power supply.
■Make sure no other appliances or lighting circuits are connected
to the refrigerator AC circuit.
■Make sure that no extension cords are being used to supply AC
power to the refrigerator.
CODE CODECODE CODE
Alternately flashes “no” and “AC”
with an audible alarm.
NOR000714A
F2 fuse okay?
1. Check AC power input from RV to unit.
2. Check for faulty AC power cord.
NO
NO
YES
Check condition of F2 fuse
on main control board
(power board).
Replace fuse. Use a 5 amp, 1/4" x 11/4"
AGC type fuse.
108 to 132
VAC?
YES
Check that fuse holder clips
are making full contact with
fuse.
Adjust clips to ensure fuse contacts are
firm in clips and making full contact.
YES
Clips okay? NO
Replace main control board assembly
(power board assembly).
Measure voltage at AC power
cord connection of the
main control board (power
board).
Troubleshooting - N10LXAND NA10LX Models, cont’d.

20
www.norcold.com
Polar Series N10LX, NA10LX
Fault Code - “AC” “HE” with Audible Alarm
Before starting this procedure:
■Make sure that the AC voltage to the refrigerator is 108-132
VAC.
■Make sure no other appliance or lighting circuit is connected to
the refrigerator AC circuit.
CODE CODE
Alternately flashes “AC” and “HE”
with an audible alarm.
The AC is off when it should be on. AC
heater “lockout”. Turn the refrigerator
OFF and then back ON to reset.
Possible Cause:
AC heater fault.
The AC heater is not plugged in.
The AC heater failed open.
Heater
connections
okay?
NO
YES
Check AC heater resistance.
See figure, below. NO Replace AC heater.
YES
Replace main control board assembly
(power board assembly).
Check AC heater wires
for loose or damaged
connections
Resistance
38-50 Ohms?
Repair or replace connectors. If
connectors cannot be repaired,
replace AC heater.
Does
problem
continue?
NO
Solved.
YES
Reset by turning refrigerator
off and then back on.
NOR000715A-1
Troubleshooting - N10LXAND NA10LX Models, cont’d.