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N109X Series

Norcold N109X Series, N109XIM Series User manual

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DO NOT install this refrigerator in below deck marine applications. Do not
install this refrigerator in xed indoor cabin or other dwelling applications. This
refrigerator must use only NORCOLD designed and approved outside air intake
and exhaust ventilation for correct and safe operation. Any other ventilation
could cause lethal combustion exhaust fumes and or/explosive propane gas
fumes to be in the living area and/or below deck.
WARNING
Service Manual
N109XIMXX
N109XXX
MODELS
Gas/Electric Refrigerators
Publication No. 625352C (06-07-07)
© 2004 THETFORD/NORCOLD. All rights reserved.
N109X Models Refrigerator Service Manual
INTRODUCTION ........................................................... 3
About this Manual ............................................................... 3
Model Identication and Information Label ......................... 3
Cooling Unit Serial Number ................................................ 3
Certication and Code Requirements ................................. 3
About Installation ................................................................ 3
Replacement Parts ............................................................. 3
Technical Assistance ........................................................... 3
SAFETY AWARENESS................................................. 4
Safety Notice ....................................................................... 4
Attention & Safety Statements ............................................ 4
SPECIFICATIONS ......................................................... 5
TROUBLESHOOTING – QUICK REFERENCE GUIDE .... 6
N109X DISPLAYED FAULT CODES ............................ 7
TROUBLESHOOTING FLOWCHARTS ....................... 8
Blank Display – Refrigerator does not turn on .................... 8
no FL Fault Code – Burner failed to ignite or reignite ......... 9
Sr Fault Code – Flame sense circuit failure ...................... 10
dc LO Fault Code – Low dc voltage .................................. 10
dc HI Fault Code – DC voltage high ..................................11
dc rE Fault Code – DC relay stuck closed .........................11
no AC Fault Code – No AC power available ..................... 12
AC rE Fault Code – AC relay stuck closed ....................... 12
AC LO Fault Code – AC voltage low ................................. 13
AC HI Fault Code – AC voltage high ................................. 13
AC HE Fault Code – AC heater failed open ...................... 14
dr Fault Code – Door open for more than 2 minutes ........ 15
Lamp Switch Operation .................................. 15
Lamp Switch Testing Procedure ....................................... 15
N109X Backup Operation ............................... 16
Thermistor Failure Fault – Controls in Backup Operating
System mode .................................................................... 16
Backup Operating System (BOS) ..................................... 16
no co Fault Code – No cooling detected by the controls ......17
Power Board Resetting Procedure ................................... 17
VENTILATION ............................................................. 18
Roof Exhaust Venting ....................................................... 18
Air Intake Vent ................................................................... 18
Roof Exhaust Vent ............................................................ 18
Bafes ............................................................................... 19
Double Sidewall Venting ................................................... 20
LP GAS SYSTEM ....................................................... 23
Pressure Requirements .................................................... 23
Testing for LP Gas Leaks .................................................. 23
Components ...................................................................... 24
Solenoid Gas Valve & Connections .............. 24
Orice ............................................................... 24
Burner & Burner Tube .................................... 24
Flue & Flue Bafe ............................................ 25
Heat Deector .................................................. 25
Flame Appearance ............................................................ 25
Burner Cleaning Procedure .............................................. 26
ELECTRICAL REQUIREMENTS AND COMPONENTS 28
DC Voltage Requirements and Polarity ............................ 28
Power Board DC Fuse .................................... 28
DC Power Wiring Requirements ....................................... 28
AC/DC Converter as Power Source .................................. 28
Lamp Assembly ............................................... 28
Divider Heater .................................................. 28
AC Power Requirements .................................................. 29
AC Heater & AC Heater Circuit Fuse ............. 29
Power Board AC Power Cord ......................... 29
TABLE OF CONTENTS
2
Ice Maker AC Power Cord .............................. 30
12 Vdc Ventilation Fan ...................................................... 30
COOLING UNIT .......................................................... 31
Description ........................................................................ 31
Heat Absorption .............................................. 31
Leveled Operation .......................................... 31
Gradual Decrease in Cooling Efciency ........................... 31
Cooling Performance Monitoring Control ......................... 31
Resetting the Power Board ............................ 32
Cooling Unit Monitoring Control Operation . 32
"no co" Fault Code ......................................... 32
Cooling Unit Vertical Bafe ............................................... 32
Refrigerant Leakage ......................................................... 32
Disposal of Cooling Unit .................................................... 32
Cooling System Diagnostic Flowchart .............................. 33
Replacing the Cooling Unit ............................................... 35
Removing the Refrigerator from the Enclosure ... 35
Removal of Cooling Unit ................................ 36
Installation of Replacement Cooling Unit ..... 36
Reinstallation of Refrigerator into Enclosure ... 39
ELECTRONIC COMPONENTS .................................. 39
Power Board Removal & Installation ......................... 40
CONTROLS ................................................................ 41
N109X Optical Control Assembly ...................................... 41
Front Box ......................................................... 41
Optical Control Assy Removal & Installation ... 41
Modes of Operation .......................................................... 42
AUTO AC Operation & AUTO LP Operation .... 42
Shift from AUTO LP GAS to AUTO AC .......... 42
No AC Power and No Flame ........................... 42
Troubleshooting No Flame and No AC Faults 42
AC Manual Mode .............................................................. 43
No AC Power or Loss of AC Power ............... 43
AC Power Restored ........................................ 43
Troubleshooting "no AC" Fault .................... 43
LP Manual Mode ............................................................... 43
Flame Fails to Ignite or Flame Goes Out ...... 43
DIAGNOSTIC MODE ................................................. 44
Accessing & exiting Diagnostic Mode ............................... 44
Changing Screens ............................................................ 44
Screens and Diagnostic Segments Information ................ 45
WIRING PICTORIALS AND DIAGRAMS ................... 47
ICE MAKER COMPONENTS AND SERVICE ............ 49
Specications .................................................................... 49
Wire Harness .................................................................... 49
Water Fill Tube & Line ....................................................... 50
12 Vdc Water Line Heater ................................................. 50
Water Valve Replacement Procedure ............................... 51
Water Valve Service .......................................................... 52
Ice Maker Troubleshooting Chart ...................................... 52
Replacing Ice Maker ......................................................... 53
Cycle Testing Ice Maker .................................................... 54
Checking Water Valve Operation ...................................... 54
Water Fill Adjustment ........................................................ 54
Checking Water Valve Solenoid Resistance ..................... 55
Checking Mold Heater Resistance .................................... 55
Checking Voltage to Motor ................................................ 55
Winterization ..................................................................... 55
N109X ModelsRefrigerator Service Manual
About this Manual
This service manual provides maintenance, diagnostic, and
repair information for
Norcold®
model N109X gas absorption
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.
Model Identication
Model N109X is a 2-way refrigerator that can operate on AC
power or LP gas. The electronic controls operate on 12 volt DC.
Letter(s) appended to the model number identify factory
installed accessories. For example, an N109XIM is a
2-way refrigerator equipped with an ice maker.
Certication and Code Requirements
Norcold®
N109X gas/electric absorption refrigerators
are certied under the latest edition of ANSI Z21.19B
standards for installation in mobile homes or recreational
vehicles.
Norcold®
N109X gas/electric absorption
refrigerators are also certied with the Canadian
Standards Association, CAN/CGA-1.4-M94.
Electrical components are compliant.
INTRODUCTION
About Installation
Refrigerator installation must conform with the N109X
Installation Manual for the Norcold® limited warranty to
be in effect. Installation must also comply with applicable
local codes and standards set by the cognizant
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 replacement 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 for service technicians
is available through the Norcold® Customer Service Center:
'Telephone: ...................................1-800-444-7210.
7Fax: ..............................................1-937-497-3183.
;World Wide Web: ............... www.norcold.com/cda.
This information is required to process technical support
requests:
nModel number.
nSerial number.
nMake, model, and year of recreational vehicle.
3
Information Label
The information label is located in the upper right corner
of the fresh food compartment just below the divider. (Fig.
Figure 1. Refrigerator information label location
NORCOLD.
INC.
SIDNEY,
OHIO
pourle GPL, equipped por le propan
TESTED FOR LP GAS: EQUIPPED FOR PROPANE / Teste
4.20 Amps 500 Watts
SUPPLY
alimentati
11 "WC10.5 "WC
BURNER
bruleur
120VAC
60Hz
12VDC
0.66 LBS
REFRIGERANT/frigorigene
R707
TEST PRESSURE /
D'ESSAI 800 PSI
3.30 Amps 40 Watts
SERIAL # / N de serie
XXXXXXX
MODEL # / N de modele
GROUP CODE / code de
INPUT / puissance
N1095RIM
For recreational vehicle installation
Min. Installation clearance 0" sides, top
bottom, back. Install only with Kit #3
See installation instructions
Pour installation vehicule de plaisance
Degagement minimum pour I'installation
0" cotes, haut,bas, arriere, Installer
uniquement avec latrousse n_3
Voir les instructions d'installation.
618860
30807
1500 BTUH
CSA-1.10-2003
REFRIGERATORS
ANZI Z221.19-2003
REFRIGERATORS
D
E
S
I
G
C
R
E
T
I
F
I
E
D
CERTIFIED
RR
Figure 2. Cooling unit bar code label location
Cooling Unit Serial Number
The cooling unit has a separate serial
number that appears on the cooling
unit bar code label. The label is
afxed to the surface of the cooling
unit leveling chamber (Fig. 2).
1). The label provides this information:
nSerial number.
nModel number.
nLP gas (propane) pressure.
nBtu/hr.
nAC voltage and amperage.
nDC voltage and amperage.
nDesign certication.
nVent kit requirement.
N109X Models Refrigerator Service Manual
Safety Statements
Do not modify, alter, or equip the refrigerator to the
use of any other fuel (natural gas, butane, etc.). N109X
refrigerators are designed and equipped for the use of
LP gas–propane gas–only.
Incorrect installation, adjustment, alteration, or
maintenance of the refrigerator can cause personal
injury, property damage, or both.
Do not smoke, light res, or create sparks when
working on the propane gas system.
Do not use an open ame for leak testing any of
the propane gas system components. Propane gas is
highly ammable and explosive.
Always use two wrenches to tighten or loosen LP
gas connections. Damaged connections, piping, and
components create the potential for gas leaks.
All electrical connections and repairs to the
refrigerator must comply with all applicable codes. Refer
to the certication and code requirements section of the
N109X Installation Manual for more information.
Do not work on live electrical circuits. 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 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
connections or electronic components. Most liquids,
including leak detection solutions, are electrically
conductive and pose the potential for an electric shock
hazard, short electrical components, damage electronic
circuits, and/or ignite a re.
Do not use leak test solutions that contain
ammonia or chlorine. Ammonia and chlorine degrade
copper and brass components.
The cooling unit is a sealed system under
pressure! Do not try to repair or recharge the cooling
unit. Do not bend, drop, weld, drill, puncture, saw, or
strike the cooling unit.
Handle a leaking cooling unit with extreme
caution! The cooling unit contains ammonia, hydrogen,
and sodium chromate. Ammonia can cause severe
skin and eye burns. Hydrogen is highly ammable,
can ignite, and burns with an intense ame. Certain
chromium compounds, such as sodium chromate, are
carcinogenic.
Do not use extension cords. Do not remove
the grounding prong from the refrigerator AC power
cord. Do not use a two prong adapter to connect the
refrigerator to the AC outlet.
Do not over-fuse electrical circuits. Use specied
fuses and AWG wire sizes. The "Specications" section
of this manual provides fuse size information. Refer to
the N109X Installation Manual for the correct AWG wire
size specications.
Prevent child entrapment! Before disposing of
the refrigerator, remove all doors and fasten all shelves
with retainers.
Some of the refrigerator's metal components have
sharp corners and edges. Wear hand protection, such
as cut resistant gloves, and exercise extreme care when
handling the refrigerator.
Make sure all hardware, such as hinges and
fasteners (retaining screws, etc.), is properly fastened.
SAFETY AWARENESS
Safety Notice
It is not possible to anticipate all of the conceivable
ways or conditions under which the refrigerator may be
serviced or to provide cautions as to all of the possible
hazards that may result. Standard and accepted safety
precautions and equipment should be used when
working on electrical circuits and handling toxic or
ammable materials. Safety goggles and other required
protection should be used during any process that can
cause material to become airborne, such as removing a
leaking cooling unit and cleaning components.
Attention Statements
The safety alert symbol followed by the word
WARNING or CAUTION identies potential safety
hazards or conditions.
The safety alert symbol with the appropriate heading
appears on all safety labels posted on the refrigerator
and safety awareness notices presented throughout this
manual.
WARNING
The above heading identies hazards or conditions,
which if ignored can cause serious injury, death,
and/or extensive property damage.
CAUTION
The above heading identies hazards, which if
ignored can cause injury and/or property damage.
4
N109X ModelsRefrigerator Service Manual
5
Storage volume
N109X -------------------------------------------------------------------------------------------------------------------------------- 9.5 ft3.
Rough opening dimensions (H x W x D)
N109X -------------------------------------------------------------------------------------------------------59
7/8 in. x 23
1/2 in. x 24 in.
Decorative panels dimensions
Thickness ---------------------------------------------------------------------------------------------------------------------------- 3/16 in.
Freezer door (H x W) ----------------------------------------------------------------------------------------- 14
17/32 in. x 21
19/32 in.
Fresh food compartment door -------------------------------------------------------------------------------- 38
5/8 in. x 21
19/32 in.
Controls
Type ------------------------------------------------------------------------------------- Electronic with built-in diagnostic function
ON/OFF/MODE/TEMP SET switches -----------------------------------------------------------------Raised pushbutton style
Temperature settings ---------------------------------------------------------------------------------------------- 1=cold, 9=coldest
Temperature sensor -----------------------------------------------------------------------------Thermistor, n mounted (10th n)
Off-level operating limits
Side-to-side--------------------------------------------------------------------------------------------------------3 degrees maximum
Front-to-back ------------------------------------------------------------------------------------------------------6 degrees maximum
DC power
Controls operating voltage ----------------------------------------------------------------------------------------- 10.5 to 15.4 Vdc
DC fuse (F1 in power board) ------------------------------------------------------------5 A (tan color), automotive blade type
DC amp draws (at nominal 12 VDC)
Automatic ignition ------------------------------------------------------------------------------------------------------------------ 0.50 A
Divider heater ----------------------------------------------------------------------------------------------------------------------- 0.25 A
Fresh food compartment lamp ------------------------------------------------------------------------------------------------- 0.46 A
Gas valve ---------------------------------------------------------------------------------------------------------------------------0.146 A
Fan ------------------------------------------------------------------------------------------------------------------------------------ 0.36 A
AC power
AC heater operating voltage requirements ---------------------------------------------------------------------- 108 to 132 VAC
Fuse ac heater circuit (F3 in power board) -------------------------------------- 5 A, 1/4 in. x 1
1/4 in. AGC type fast acting
AC heater rating ----------------------------------------------------------------- 300 W/2.5 A @ 120 VAC (resistance of 48 Ω)
LP gas (propane)
Operating pressure ----------------------------------------------------------------------------------------------- 10.5 to 11.5 in. w.c.
Heat input ---------------------------------------------------------------------------------------------------- 1500 Btu/h @ 11 in. w.c.
Orice -----------------------------------------------------------------------------------------------------------------------------------LP16
Gas ignition ----------------------------------------------------------------------------------- Automatic with ame sensing circuit
Electrode tip-to-burner air gap ------------------------------------------------------------------------------------------ 1/8 to 3/16 in.
N109X Models
SPECIFICATIONS
N109X Models Refrigerator Service Manual
TROUBLESHOOTING – QUICK REFERENCE GUIDE
Problem Possible Cause Checks/Reference
Ventilation restricted or obstructed.
Cooling unit problem.
No AC power to refrigerator.
F3 fuse in the power board open.
AC heater failed open.
Check LP gas supply and valves.
See page 8.
See page 8.
See page 9.
See page 7.
Check 12 volt DC connections.
Check fuse F1 (5 amp) in power board.
No 12 volt DC power to refrigerator.
Faulty/loose 12 volt DC connections.
F1 fuse in power board open.
See page 11.
Check fuse F3.
See page 13.
Ventilation obstructed.
AC voltage low.
Check enclosure for airflow obstructions.
See page 12.
No LP gas.
Incorrect electrode tip-to-burner gap.
Faulty spark/sense electrode assembly.
Flame sensing circuit failure.
Ventilation restricted or obstructed.
Incorrect LP gas pressure.
Dirty burner.
Missing flue baffle.
Heat deflector blocked.
Check enclosure for obstructed airflow.
See page 8.
See page 8.
See page 24.
See page 24.
The refrigerator does not turn ON.
The refrigerator does not cool on
ac power.
The refrigerator does not cool
efficiently on ac power.
The refrigerator does not operate
on LP gas.
The refrigerator does not cool on
any of the power sources.
The refrigerator does not
cool efficiently on LP gas.
Check enclosure for obstructed airflow.
See pages 16 and 30.
6
N109X ModelsRefrigerator Service Manual
7
N109X DISPLAYED FAULT CODES
See page 15.
Flashing
Temp
Setting
Backup operating system in operation.
D
i
s
p
l
a
y
A
l
t
e
r
n
a
t
i
n
g
See pages 16
and 30.
Audible
Alarm
No cooling detected by the controls.
See page 14.
Audible
Alarm
Fresh food compartment door open more than 2 minutes.
Lamp reed relay switch faulty.
A
l
t
e
r
n
a
t
i
n
g
D
i
s
p
l
a
y
See page 13.
Audible
Alarm
AC heater failed open.
D
i
s
p
l
a
y
A
l
t
e
r
n
a
t
i
n
g
See page 12.
AC voltage high.
D
i
s
p
l
a
y
A
l
t
e
r
n
a
t
i
n
g
See page 12.
AC voltage low.
A
l
t
e
r
n
a
t
i
n
g
See page 11.
D
i
s
p
l
a
y
Audible
Alarm
AC relay stuck closed.
D
i
s
p
l
a
y
A
l
t
e
r
n
a
t
i
n
g
See page 11.
Audible
Alarm
No ac power available to refrigerator.
AC cord not plugged into power board.
F3 fuse open.
D
i
s
p
l
a
y
A
l
t
e
r
n
a
t
i
n
g
See page 10.
DC voltage high.
Code Probable Cause Reference
See page 7.
Blank
Display
Screen
Refrigerator turned off.
No 12 Vdc to refrigerator.
F1 fuse open.
D
i
s
p
l
a
y
A
l
t
e
r
n
a
t
i
n
g
See page 8.
Audible
Alarm
The burner failed to ignite or reignite.
See page 9.
Audible
Alarm
Flame sense circuit failure.
D
i
s
p
l
a
y
A
l
t
e
r
n
a
t
i
n
g
See page 9.
DC voltage low.
N109X Models Refrigerator Service Manual
Blank Display – Refrigerator does not turn on
TROUBLESHOOTING FLOWCHARTS
Figure 3. Checking the dc fuse
continuity
Figure 4. Measurement points for wire harness voltage
Before beginning this procedure make sure:
■
The RV DC power system is supplying 10.5 to 15.4 volts to the refrigerator.
■
No other RV appliances or lighting circuits are connected to the refrigerator dc circuit.
■
12 volt DC input to the power board is wired according to the N109X Installation Manual.
Fault indicator displayed:
Measure voltage across
power board 12VDC and
GND1 connections
.
1. Low/no DC power input to power board.
2. Loose/faulty wiring or connectors.
NO
NO
YES
Check condition of F1 fuse
in power board. See Figure 3.
Replace fuse. Use a standard 5 amp
(tan color) automotive blade style fuse.
10.5 to
15.4 volts DC?
YES
Measure voltage at optical
control harness. See
Figure 4.
Replace power board.
See page 38.
YES
Voltage
present?
NO
Replace optical control assembly.
See page 39.
F1 fuse okay?
Wire harness optical
control display connector
White/red wire
White/violet wire
87III
V
10.5 to 15.4 volts DC
V
mA
A
mV
V
V
OFF
ACOM V
mA
m
A
m
A
87III
Good= 00.0
W
00.0
Bad = OL
F1 Fuse
ON TEMP
SET
MODE ON-OFF
1-COLD COLDEST-9
8
N109X ModelsRefrigerator Service Manual
9
no FL Fault Code – Burner failed to ignite or reignite
Air gap
1/8 to 3/16
inch?
Burner
clean?
Before beginning this procedure make sure:
■
RV LP gas tank valve is open.
■
Refrigerator solenoid gas valve manual shutoff is open.
■
LP gas pressure at the solenoid gas valve pressure tap is 10.5. to 11.5 in. w. c.
Clean and service burner.
See page25.
NO
YES
Check that electrode tip-to-
burner air gap is correct.
NO
Set electrode-to-burner air gap
1/8 to 3/16 inch.
YES
Continuity?
Check spark/sense electrode
assembly for continuity.
NO
Replace spark/sense electrode
assembly.
Voltage?
YES
Check voltage across power
board terminals GV and
GV GND.
NO
Replace power board.
Continuity?
YES
Check gas valve solenoid
wires for continuity.
NO
Replace gas valve wires.
YES
Check gas valve solenoid
resistance.
.
NO
Replace gas valve.
79 to 85 Ω?
Check burner condition.
YES
Faulty or obstructed gas valve.
Replace gas valve.
ON TEMP
SET
MODE ON-OFF
1-COLD COLDEST-9
D
i
s
p
l
a
y
A
l
t
e
r
n
a
t
i
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g
Audible
Alarm
N109X Models Refrigerator Service Manual
Sr Fault Code – Flame sense circuit failure
dc LO Fault Code – Low dc voltage
Fault indicator displayed:
Replace power board.
See page 38.
Flame sense circuit failure.
ON TEMP
SET
MODE ON-OFF
1-COLD COLDEST-9
Voltage
lower than
10.5 volts?
NO
Check RV 12 volt DC power supply to
the power board.
YES
See NOTE below to determine
and correct "dc LO" fault.
Check for DC voltage input
to power board terminals
12VDC and GND1.
Audible
Alarm
ON TEMP
SET
MODE ON-OFF
1-COLD COLDEST-9
A
l
t
e
r
n
a
t
i
n
g
D
i
s
p
l
a
y
Before beginning this procedure:
■
Make sure RV DC voltage to refrigerator is 10.5 to 15.4 volts.
■
Determine if the "dc LO" fault code displays when the converter is the source of DC power.
■
Make sure no other appliance or lighting circuit is connected to the refrigerator DC circuit.
Fault indicator displayed:
NOTE
Electronic controls operate on 12 volt DC. When an AC/DC converter is
used to supply DC power, the refrigerator circuit must be connected to the
appliance output terminals of the converter (ltered side).
If the refrigerator circuit is connected to the unltered side the AC ripple
generated by the converter may cause a "dc" "LO" fault code to display.
To troubleshoot a "dc" "LO" fault, connect a charged 12 volt automotive
battery to the power board. If the "dc" "LO" code clears, the fault was
caused by unltered DC power.
If the "dc LO" code does not clear, replace the power board (see page 38).
10
N109X ModelsRefrigerator Service Manual
11
dc HI Fault Code – DC voltage high
dc rE Fault Code – DC heater relay stuck closed
Fault indicator displayed:
Replace power board.
See page 38.
DC heater relay stuck closed.
Audible
Alarm
ON TEMP
SET
MODE ON-OFF
1-COLD COLDEST-9
A
l
t
e
r
n
a
t
i
n
g
D
i
s
p
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a
y
NOTE
Electronic controls operate on 12 volt DC. When an AC/DC converter is
used to supply DC power, the refrigerator circuit must be connected to the
appliance output terminals of the converter (ltered side).
If the refrigerator circuit is connected to the unltered side the AC ripple
generated by the converter may cause a "dc " "HI " fault code to display.
To troubleshoot a "dc " "HI" fault, connect a charged 12 volt automotive
battery to the power board. If the "dc" "HI" code clears, the fault was caused
by unltered DC power.
If the "dc LO" code does not clear, replace the power board (see page 38).
N109X Models Refrigerator Service Manual
no AC Fault Code – No AC power available
AC rE Fault Code – AC heater relay stuck closed
Before beginning this procedure make sure:
?
No other problems exist with the RV AC power supply.
?
No other appliances or lighting circuits are connected to the refrigerator AC circuit.
?
Extension cords are not being used to supply AC power to the refrigerator.
Fault indicator displayed:
F3 fuse okay?
1. Check AC power input from RV to unit.
2. Check for faulty AC power cord.
NO
NO
YES
Check condition of F3 fuse
in power board.
Replace fuse. Use only a 5 amp,
1
/
4
" x 1
1
/
4
"
AGC type fuse.
108
to
132 volts?
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 power board.
See page 38.
Measure voltage at power
board AC cord connection.
Audible
Alarm
ON TEMP
SET
MODE ON-OFF
1-COLD COLDEST-9
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Fault indicator displayed:
Replace power board.
See page 38.
AC heater relay stuck closed.
Audible
Alarm
ON TEMP
SET
MODE ON-OFF
1-COLD COLDEST-9
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N109X ModelsRefrigerator Service Manual
13
AC LO Fault Code – AC voltage low
AC HI Fault Code – AC voltage high
Before beginning this procedure:
■ Determine if a certain AC power source sets the "AC” “LO" fault code (generator, shore power, inverter).
■ Make sure no other appliance or lighting circuit is connected to the refrigerator AC circuit.
■ Make sure extension cords are not being used to supply AC power to the refrigerator.
Fault indicator displayed:
Fault related to RV AC power distribution
component or circuit supplying AC power
to refrigerator.
YES
NO
Replace power board.
See page 38.
Voltage
lower than
108 volts?
Measure voltage at power
board AC cord connection.
Audible
Alarm
ON TEMP
SET
MODE ON-OFF
1-COLD COLDEST-9
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Before beginning this procedure:
■
Determine if a certain AC power source sets the "AC HI" fault code (generator, shore power, inverter).
Fault indicator displayed:
Fault related to RV AC power distribution
component or circuit supplying AC power
to refrigerator.
YES
NO Replace power board.
See page 38.
Voltage
higher than
132 Vac?
Measure voltage at power
board ACcord connection.
Audible
Alarm
ON TEMP
SET
MODE ON-OFF
1-COLD COLDEST-9
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N109X Models Refrigerator Service Manual
AC HE Fault Code – AC heater failed open
AC heater resistance 38 to 53
Ω.
Before beginning this procedure make sure:
n
RV AC voltage to the refrigerator is 108 to 132 volts.
n
No other appliance or lighting circuit is connected to the refrigerator AC circuit.
Fault indicator displayed:
Heater
connections
okay?
NO
YES
Check AC heater resistance.
See Figure 5.
NO Replace AC heater.
See page 28.
YES
Replace power board.
See page 38.
Check AC heater wires for
loose or damaged connection.
Resistance
38 to 53
Ω
?
Audible
Alarm
ON TEMP
SET
MODE ON-OFF
1-COLD COLDEST-9
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Repair or replace connectors. If
connectors cannot be replaced,
replace heater. See page 28.
Figure 5. Measuring AC heater resistance.
Multimeter set to
Ohms scale
14
N109X ModelsRefrigerator Service Manual
15
dr Fault Code – Door open for more than 2 minutes
Lamp Switch Testing Procedure
1. Slide a magnetic screwdriver tip or a small magnet
on the underside of the optical control assembly
as shown in Figure 6.
2. Check the food compartment light as the
screwdriver tip is moved under the display:
nThe light should turn off when the magnetic
screwdriver tip or magnet passes under the optical
control assembly.
nThe light should turn on when the magnetic
screwdriver tip or magnet is distanced from the
underside of the optical control assembly.
3. If the light does not turn off when the magnet
passes under the optical control display, replace
the optical control display assembly. See page 39.
Before beginning this procedure make sure:
■
Light/thermistor connector and wire harness connector are fully engaged and locked.
Fault indicator displayed:
Adjust striker plate.
NO
YES
Check for correct door
installation. See NOTE below.
NO
Test lamp switch operation. See switch
test procedure below.
YES
Check for location of magnet if the door
swing was changed. See NOTE below.
Check that the door latch
striker plate is adjusted
correctly.
Was door
swing
changed?
Striker plate
okay?
Audible
Alarm
ON TEMP
SET
MODE ON-OFF
1-COLD COLDEST-9
NOTE
Always follow the instructions provided in the
Owner's Manual to change the refrigerator door
swing. The bottom door trim does not have a
magnet. Inverting the doors will required non-
approved modications and will cause the fresh
food compartment light to remain on when the door
is closed.
Figure 6. Testing light switch operation.
Food Compartment Lamp Switch
A reed relay switch turns the fresh food compartment
light on and off. This switch is an integral component of
the optical control display board circuitry.
Lamp Switch Operation
The lamp switch operates using a permanent magnet
located underneath the fresh food compartment door
cap. When the door is fully closed, the magnet pulls and
maintains the switch contacts open (light off). Opening
the door breaks pull the door cap away from the switch,
causing the switch contacts to close (light on).
N109X Models Refrigerator Service Manual
Thermistor Failure Fault – Controls in Backup Operating System mode
Backup Operating System (BOS)
The backup operating system (BOS) is an electronically
controlled duty cycle. It maintains the refrigerator
in operation if the thermistor is is open, shorted or
disconnected from the circuit. BOS maintains cooling by
controlling the heat source selected. In BOS the length
of the cooling cycle is controlled by a timer.
To accomplish this, the BOS adjusts the length of the
cooling cycle according to the temperature setting
selected by the user; the higher the temperature
setting, the longer the cooling cycle. For example, if
the temperature setting is set to 5, raising the setting
to 6 will lengthen the cooling cycle, resulting in lower
refrigerator temperature.
When a warmer temperature is desired, changing the
temperature setting to a lower number shortens the
cooling cycle. For example, if the temperature setting is
set to 6, lowering the setting to 5 will shorten the cooling
cycle, resulting in warmer refrigerator temperatures..
N109X Backup Operation
When the N109X controls shift to BOS operation, the
temperature setting ashes for ten seconds when the
TEMP button is pressed. After ten seconds, the "ON"
LED displays.
Figure 7. Thermistor terminals and connector. Figure 8. Checking thermistor resistance.
Before beginning this procedure:
■ Make sure lamp/thermistor assembly is connected to the wire harness.
Fault indicator displayed:
Thermistor
Lamp
Connection
Thermistor
Connections
Clean/repair terminals or connector as
required. See Figure 7.
NO
Check thermistor resistance.
See Figure 8 below.
Wires and
connector
good?
Check lamp/thermistor wire
assembly and connector for
dirty/broken connections.
YES
Thermistor packed in ice bath
Temperature* Resistance*
(oF) (k )
85 8.1– 9.0
80 9.1–10.0
75 10.1–11.0
70 11.1–12.0
60 12.1–13.0
50 15.5–16.5
40 22.5–23.5
35 24.5–25.5
33 28.5–29.5
32 30.0–32.0
*
Approximate Values
ON TEMP
SET
MODE ON-OFF
1-COLD COLDEST-9
Te mp
Setting
Flashing
As the thermistor cools in the ice bath
the resistance value goes up. When the
thermistor is exposed to warmer temperatures
the reisistance reading goes down See Ta ble.
Multimeter set to
kOhms function.
16
N109X ModelsRefrigerator Service Manual
17
no co Fault Code* – No cooling detected by the controls
10. Turn OFF the refrigerator.
11. Disconnect the 12 VDC power positive and
negative wires from the power board.
12. Install the power board cover.
13. Reconnect the following to the power board:
a. Spark/sense electrode assembly wire.
b. Solenoid gas valve wires.
c. AC power cord.
d. 12 VDC positive and negative wires from the
power board.
14. Place refrigerator in service.
8. Turn OFF the refrigerator.
9. Turn ON refrigerator. If "no co" code displays,
repeat steps 7 - 9. Figure 9. Resetting the power board.
NOTE
A jumper wire to jump Pin 15 to ground can be
made from a 8-inch long insulated 14 AWG wire by
stripping 1/2 inch of insulation from each end.
Pin 16
White/violet wire
To pin 15 Ground Lug
Insulated wire jumper
22 AWG with 1/2" long stripped ends
Fault indicator displayed:
NO
YES
Check for completion of
cooling cycle after resetting
power board.
NO
Cooling unit is good. Recheck for
ventilation obstructions and leveled
operation.
YES
Check for cooling at fin
assembly.
"no" "co"
code shows
before cycle
end?
Cooling
detected?
Audible
Alarm
ON TEMP
SET
MODE ON-OFF
1-COLD COLDEST-9
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1. Check for ventilation obstructions
and leveled operation.
2. Reset power board as shown in
Figure 9 and described in procedure
below.
3. Allow unit to operate normally.
1. Replace cooling unit if "no co"
shows before completing a full
cooling cycle.
2. Reset power board as shown in
Figure 9 and described in procedure
below.
* For more information on the "no co" fault code, see
pages 30-33
Power Board Resetting Procedure
1. Turn OFF the refrigerator.
2. Disconnect the following from power board:
a. 12 VDC positive and negative wires.
b. AC power cord.
c. Solenoid gas valve wires.
d. Spark/sense electrode assembly wires.
3. Remove the power board cover.
4. Reconnect 12 VDC positive and negative wire.
5. Turn ON the refrigerator.
6. Locate Pin 15 on 16 pin connector (P1). Pin 15
is the empty socket to the right of the white/violet
wire on the top row. See Figure 9.
7. Using a 14 AWG size insulated jumper wire, jump
Pin 15 to the power board ground lug for 10 -
15seconds. A click sound will indicate when the
controls reset. See Figure 9.
N109X Models Refrigerator Service Manual
VENTILATION
Figure 10. Roof exhaust venting arrangement
Roof Exhaust Venting The space between the air intake vent and the rear
of the refrigerator must be kept clear at all times. Any
obstruction in this area may cause serious ventilation
problems. The air intake vent opening also provides
access for servicing cooling unit components.
Roof Exhaust Vent
The heat absorbed by ventilation air and combustion
gases ow out of the enclosure through the roof exhaust
vent. See Figure 10 below and Figure 11, page 18.
The roof exhaust vent is equipped with a non-
removable metal mesh screen that prevents leaves,
debris, birds or rodents from getting into the enclosure.
The roof cap is fastened to the exhaust vent with four
screws. The cap is always installed with the slope
towards the front of the RV.
Air Intake Vent
The ventilation and combustion air ows into the
enclosure through the air intake vent. See Figure 10
below and Figure 11, page 18.
Intake vent
Absorber coils
1/8 inch maximum
(if wider see Figure 11)
Roof exhaust vent
Condenser
1 inch maximum
(if wider see Figure 12)
Baffle
Full width of enclosure
to isolate the top of refrigerator
from rejected heat
RV front RV rear
Exhaust vent screen
1/4 inch or less
Vertical baffle
Do not remove!
Fan
The general guidelines for intake vents and
roof exhaust vents presented in this section do
not replace the instructions and/or guidelines
provided in the N109X Installation Manual
and the Ventilation Guidelines For Gas/Electric
Refrigerators, part number 622090A (3-01). Refer
to the N109X Installation Manual and Ventilation
Guidelines For Gas/Electric Refrigerators for the
latest information on approved vents, installation
instructions, and special construction exceptions.
NOTE
18
N109X ModelsRefrigerator Service Manual 19
Bafes
The minimum and maximum clearances for installing
the refrigerator or correcting ventilation problems on
roof vented units are listed in Table 1 below. Bafes
are required whenever installations exceed maximum
clearances listed in Table 1. Figure 11 and Figure 12
show bafe locations.
Vertical Angled Bafes
Vertical angled bafes are required when the roof exhaust
vent is installed inboard of the condenser. Figure 12
shows the angled vertical bafes required on inboard roof
vent installations. The horizontal wall bafes are required
whenever the distance between the cooling unit and the
interior surface of the outside wall exceeds one inch.
Figure 11. Back view–roof exhaust venting
Figure 12. Bafes required for an inboard
roof exhaust vent installation
Minimum Maximum
Bottom 0 inch 0 inch
Sides (each) 0 inch 1/2 inch
Top 0 inch 1/4 inch
Rear 0 inch 1 inch
Table 1. Clearances for roof vented installations
Angled baffles
required when the
roof exhaust vent
is inboard of
the condenser.
Baffles
required when
the opening between
the outside wall and
cooling unit is over
1 inch.
Condenser
Air intake vent
1/4 inch or
less
Fan
Intake vent
Condenser
Absorber coils
Side wall baffles
required when the
clearance between the
enclosure side walls
and refrigerator
exceeds 1/8 inch.
Top baffle required
when the clearance from
the cealing to the top of the
refrigerator exceeds 1/4 inch.
Vertical baffle Do not remove!
Fan
N109X Models Refrigerator Service Manual
Two bafes are required for the N109X model in double
sidewall venting applications. It should be noted that
bafe arrangements are different if the enclosure
depth is greater or less than 26 inches. The bafe
congurations are shown in Figure 13, page 20, and
Figure 14, page 21.
Air Intake Vent
The ventilation and combustion air ow into the
enclosure is through the air intake vent. See Figure 13,
page 20, and Figure 14, page 21.
Sidewall Exhaust Vent
The heat absorbed by ventilation air and combustion
gases ow out of the enclosure through the sidewall
exhaust vent. See Figure 13, page 20, and Figure 14,
page 21 for details.
Double Sidewall Venting
Because of increased installation of refrigerators in
RV slide outs, NORCOLD has developed venting
guidelines for double sidewall vent applications. This
ensures NORCOLD refrigerators meet the ANSI Z21.19
standards for cooling performance when used in slide
out applications.
The challenge with slide out installations is that the
"chimney effect" (see page 30) that is present with
roof vent installations is not as strong in slide outs. To
improve the airow of the chimney effect, sidewall vent
installations must have fans and bafes. These fans and
bafes direct the air ow through the surfaces of heat
rejecting components. NORCOLD has determined that
the following three key design considerations optimize
heat removal in slide out applications.
n Refrigerators installed in slide outs must have
a fan or fans to assist air ow. All N109X
refrigerators have a factory installed fan.
nFresh air must be directed to ow through the
surface areas of the absorber coils, condenser
ns, and the outer surface of the canister.
nCorners and structural pockets where heated
air may stagnate must be reduced in size or
completely eliminated.
The general guidelines for intake vents and
roof exhaust vents presented in this section do
not replace the instructions and/or guidelines
provided in the N109X Installation Manual
and the Ventilation Guidelines For Gas/Electric
Refrigerators, part number 622090A (3-01). Refer
to the N109X Installation Manual and Ventilation
Guidelines For Gas/Electric Refrigerators for the
latest information on approved vents, installation
instructions, and special construction exceptions.
NOTE
20
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