Zero ARB User manual

SERVICE MANUAL ZERO
Single Zone Models: 36L (38qrt), 44L (46qrt), 60L (63qrt), 73L (77qrt), 105L (111qrt)
Dual Zone Models: 69L (73qrt), 96L (101qrt)

Revision Date – 15/07/2020 page 1
TABLE OF CONTENTS
1INTRODUCTION .................................................................................................................. 2
1.1 General information .................................................................................................... 2
1.2 How to use this manual .............................................................................................. 2
1.3 Contact information .................................................................................................... 2
2WARRANTY ........................................................................................................................ 3
2.1 ARB Fridge Freezer Limited Warranty ....................................................................... 3
2.2 Warranty procedure for service agents ...................................................................... 3
3STANDARD SERVICE/WARRANTY TIMES ....................................................................... 4
4SPARE PARTS .................................................................................................................... 5
4.1 Spare parts list ........................................................................................................... 5
4.2 Spare parts exploded drawing .................................................................................... 6
4.3 Minimum stocked spare parts .................................................................................... 7
5TOOLS REQUIRED ............................................................................................................. 8
5.1 Basic servicing ........................................................................................................... 8
5.2 Servicing the refrigeration system .............................................................................. 8
6TROUBLESHOOTING ......................................................................................................... 9
6.1 Check light codes. ...................................................................................................... 9
6.2 DC Power Supply ..................................................................................................... 10
6.3 AC Power Supply ..................................................................................................... 14
6.4 Cooling ..................................................................................................................... 15
6.5 General .................................................................................................................... 18
6.6 Battery Protection Settings ....................................................................................... 19
7FAULT FINDING FLOW CHARTS .................................................................................... 20
7.1 Fridge will not run on 100-240V AC power ............................................................... 20
7.2 Fridge will not run on 12/24V DC power ................................................................... 21
8CHECKS AND TESTS ....................................................................................................... 22
8.1 Vehicle wiring system ............................................................................................... 22
8.2 Test AC Rectifier ...................................................................................................... 25
8.3 Test Compressor control unit – 12/24V DC .............................................................. 28
8.4 Test Thermistor ........................................................................................................ 30
8.5 Adjust internal temperature correlation .................................................................... 31
9SERVICE AND REPAIR .................................................................................................... 32
9.1 Handles – Replace ................................................................................................... 32
9.2 Corner Columns – Replace ...................................................................................... 33
9.3 Front Cover – Replace ............................................................................................. 34
9.4 Control Panel Circuit Board – Replace. .................................................................... 37
9.5 Compressor control unit – Replace .......................................................................... 38
9.6 Main circuit board - Replace..................................................................................... 39
9.7 Compressor base plate – Replace ........................................................................... 41
9.8 AC Rectifier - Replace .............................................................................................. 43
9.9 Cooling Fan - Replace ............................................................................................. 45
9.10 Thermistor – Replace ............................................................................................... 46
9.11 Plug fuse (12/24V DC) - Replace ............................................................................. 48
9.12 Device fuse (100-240V AC) - Replace ..................................................................... 48
10 SERVICE BY REFRIGERATION MECHANIC ................................................................... 49
10.1 Compressor recharge information ............................................................................ 49
10.2 Leaks in the refrigerant system. ............................................................................... 49
11 WIRING .............................................................................................................................. 50
11.1 Wiring diagram (Single Zone)................................................................................... 50
11.2 Wiring diagram (Dual Zone) ..................................................................................... 51

Revision Date – 15/07/2020 page 2
1 INTRODUCTION
1.1 General information
This manual is for the sole use of ARB approved repairers and provides information on servicing the
ARB Zero Fridge Freezer (Type 10802010 -> 10802070). The part numbers covered by this manual
include 10802XYZ, where XY is the specific fridge size and Z is the country destination.
Deviation from the directions given in this manual are not permitted without the express permission of
the ARB Fridge Freezer Product Manager or the ARB Warranty Manager.
If you have any queries about servicing an ARB Fridge Freezer, please contact ARB using the contact
details below.
This manual makes reference to working with mains power in the range from 100-240V AC. All electrical
work of this nature must be carried out by a qualified electrician.
This manual makes reference to working with the refrigeration system of the fridge freezer. All work
involving the refrigeration system must be carried out by a qualified refrigeration mechanic.
Please note that safe working practices must be exercised while performing any work on an ARB Fridge
Freezer.
1.2 How to use this manual
This manual has been developed as an electronic resource. To navigate through this manual, click on
the blue underlined reference links.
Throughout this manual, reference is made to replacement parts. All spare parts are available from ARB.
A complete list of spare parts and corresponding part numbers is given in Section 4.1 of this manual.
Please note that individual part numbers are not listed elsewhere within this manual.
The following terms are used throughout this manual:
CAUTION: These are instructions given to prevent damage or accidents.
HINT: These are helpful suggestions to aid the servicing procedure.
NOTE: These are details which may further clarify a situation.
WARNING: These are safety warnings. Failure to observe these instructions can cause personal
injury or damage to the fridge.
1.3 Contact information
ARB 4x4 ACCESSORIES
Corporate Head Office
42-44 Garden St Tel: [phone]
Kilsyth, Victoria Fax: [phone]
AUSTRALIA, 3137
Australian enquiries [email protected]
North and South American enquiries [email protected]
Other international enquiries [email protected]
www.arb.com.au

Revision Date – 15/07/2020 page 3
2 WARRANTY
2.1 ARB Fridge Freezer Limited Warranty
ARB Corporation Ltd’s Fridge Freezers are warranted to be free from material and workmanship defects
as per the ARB warranty policy. The below website will direct you to the ARB policies page which
contains all current warranty information.
https://www.arb.com.au/about/policy/
It is the responsibility of the owner to deliver and pick up the appliance from the place of service.
ARB reserves the right to change the warranty conditions at any time by public notice and by attaching a
clear change of warranty terms and conditions notice to the product visible at time of purchase. No party
other than ARB Corporation Ltd is authorised to change the terms or conditions of this warranty.
Subject to conditions as defined by the Australian Trade Practices Act 1974 (as amended). There are no
other warranties either expressed or implied, which extend beyond those set forth in the preceding
paragraphs.
2.2 Warranty procedure for service agents
The following procedure should be followed when processing a warranty claim.
1. The Fridge Freezer should be received with all components, including all power leads. A physical
inspection of the unit should be conducted to ascertain whether there is any damage (eg:
scratches, dents, stain, etc), and documented on the application.
2. Assess the fridge to identify the fault(s).
3. Complete a copy of the warranty claim form and forward it to your regional ARB Office. To be
processed, the form must include the customer’s details, serial number, a description of the fault,
and the parts required.
NOTE: A copy of the purchase receipt must be submitted with the claim.
4. ARB will assess the claim and if approved will dispatch the required parts as soon as practical at
no charge to the repairer. If the claim is not approved, ARB will contact the repairer. ARB will also
issue the repairer with a Warrant Claim Number and provide any special instructions for repair or
return of faulty parts.
5. The repairer shall replace the specified components as per the service manual and test the ARB
Fridge Freezer prior to its return to the customer. It is the responsibility of the repairer to warrant
the workmanship of the repair for the minimum period as set out in legislation for the jurisdiction
in which the ARB Fridge Freezer has been repaired, or if no period is specified, for a minimum of
90 days.
6. Send an invoice that references the Warranty Claim Number to your regional ARB Office for
processing. Any variance to the warranty times as stated in this manual must be approved by
ARB.
EXCLUSIONS
Refer to the Warranty Statement supplied with the fridge.
ARB will not accept liability for transport of the ARB Fridge Freezer to or from the service agent.

Revision Date – 15/07/2020 page 4
3 STANDARD SERVICE/WARRANTY TIMES
WORK REQUIRED
INDIVIDUAL WARRANTY TIME*
Compressor – remove and replace **
Condenser – remove and replace **
Refrigerant blockage or leak **
Compressor control unit – remove and replace
1.0 hours
Compressor mounting base –remove and replace
1.5 hours
Control panel circuit board – remove and replace
1.0 hours
Device / plug fuse - replace
0.25 hours
Fan – remove and replace
1.0 hours
Hinge assembly – service
0.25 hours
Inlet power socket - remove and replace
0.75 hours
Latch assembly – remove and replace
0.25 hours
Lid seal – remove and replace
0.25 hours
Interior Light - replace
0.25 hours
Main circuit board – remove and replace
1.0 hours
Power cable – check and replace
0.25 hours
Rubber feet – remove and replace (x 4)
0.25 hours
Thermistor - replace
1.0 hours
* Some warranty times can be negotiable due to unforeseen complexities. Any extension to the standard
warranty times must be authorised by ARB.
** These parts are not considered serviceable items. Complete fridge replacement is required.
*** Light LED is only covered under warranty for the first 3 months after the initial purchase date.
ARB will not pay for the removal or replacement of a fridge freezer that has been built in, unless
authorisation is given by the ARB.
The warranty labour rate paid will be based on the average refrigeration service rate for the region of the
repairer.
Calculating total warranty time
The table above list warranty times for the service of individual components.
If a single item is serviced or replaced and the warranty time is less than 0.5 hours, ARB will accept a
total warranty time of 0.5 hours. This will allow for assessment and administration of the warranty claim.
If multiple components are to be serviced or replaced under the same warranty claim, the full individual
warranty time will not be paid to replace each component. The total warranty time paid will be calculated
as follows:
Individual warranty time

For component being replaced with the
longest individual warranty time.
+
0.5 hours

For each additional component being
replaced with an individual warranty time
greater than 0.5 hours
+
Individual warranty time

For each additional component being
replaced with an individual warranty time less
than 0.5 hours

Revision Date – 15/07/2020 page 5
4 SPARE PARTS
4.1 Spare parts list
The items in the following table correspond with the items on the exploded diagram in section
4.2.
ITEM
ARB MAIN DESCRIPTION
QTY
ARB PART #
1
LID LATCH ZERO 36/44L
1 kit
10910142
2
LID LATCH ZERO 60/69/73/105L
1 kit
10910143
3
LID LATCH ZERO 96L
1 kit
10910144
4
CABINET PIN HINGE ZERO 36/44L
1 pair
10910145
5
CABINET PIN HINGE ZERO 60/69/73/96/105L
1 pair
10910146
6
LID SOCKET HINGE ZERO 36/44L
1 pair
7
LID SOCKET HINGE ZERO 60/69/73/96/105L
1 pair
8
CONDENSER FAN ZERO
1
10910159
9
COMPRESSOR CONTROL UNIT ZERO 36/44L
1
10910161
10
COMPRESSOR CONTROL UNIT ZERO 60/69/73/96/105L
1
10910162
11
INTERIOR LIGHT LENSE ZERO
1
10910171
12
CORNER COLUMN ZERO 36L
1 kit
10910172
13
CORNER COLUMN ZERO 44L
1 kit
10910173
14
CORNER COLUMN ZERO 60L
1 kit
10910174
15
CORNER COLUMN ZERO 69/73L
1 kit
10910175
16
CORNER COLUMN ZERO 96/105L
1 kit
10910176
17
LID RUBBER INSERT ZERO 36/44L
1
10910177
18
LID RUBBER INSERT ZERO 60/69/73/96/105L
1
10910178
19
HANDLE ASSEMBLY FRONT ZERO 60/69/73/96/105L
1 kit
10910179
20
HANDLE ASSEMBLY REAR ZERO 60/69/73/96/105L
1 kit
10910180
21
HANDLE ASSEMBLY FRONT ZERO 36/44L
1 kit
10910181
22
HANDLE ASSEMBLY REAR ZERO 36/44L
1 kit
10910182
23
HANDLE SUPPORT BRACKET ZERO 36/44L
1 kit
10910183
24
HANDLE SUPPORT BRACKET ZERO 60/69/73/96/105L
1 kit
10910184
25
RUBBER FOOT ZERO
1
10910185
26
DRAIN PLUG
1
10910186
27
LID ZERO 36/44L
1
10910194
28
LID ZERO 60/69/73L
1
10910195
29
LID ZERO 96LDZ
1
10910196
30
LID ZERO 105L
1
10910197
31
COMPRESSOR BASE SUPPORT ZERO
1
10910202
32
VENT SHROUD SCREWS SIDE ZERO
1 set
10910204
33
VENT SHROUD ZERO 36/44L
1
10910206
34
VENT SHROUD ZERO 60/69/73L
1
10910207
35
VENT SHROUD ZERO 96/105L
1
10910208
36
DISPLAY PANEL TOUCHPAD
1
10910209
37
ARB BADGE LOGO ZERO
1
10910210
38
POWER SOCKET SUPPORT PANEL
1 kit
10910211
39
COMPRESSOR BASE PLATE ZERO 36/44L
1
10910216
40
COMPRESSOR BASE PLATE ZERO 60/69/73L
1
10910217
41
COMPRESSOR BASE PLATE ZERO 96/105L
1
10910218
42
BASKET SYSTEM ZERO 36L
1 system
10910187
43
BASKET SYSTEM ZERO 44L
1 system
10910188
44
BASKET SYSTEM ZERO 60L
1 system
10910189
45
BASKET SYSTEM ZERO 73L
1 system
10910190
46
BASKET SYSTEM ZERO 105L
1 system
10910191
47
BASKET SYSTEM ZERO 69LDZ
1 system
10910192
48
BASKET SYSTEM ZERO 96LDZ
1 system
10910193
49
POWER SOCKET SUPPORT PANEL REAR
1
NOTES:
 Quantity column indicates maximum number of individual items per service repair.
 The part number given is for singular units unless otherwise stated in the item description.
 Drawings are indicative only, product appearance may change slightly.

Revision Date – 15/07/2020 page 6
4.2 Spare parts exploded drawing
The items in the following exploded diagram correspond with the items in the table in section 4.1.

Revision Date – 15/07/2020 page 7
The following items are not illustrated in section 4.2.
ITEM
ARB MAIN DESCRIPTION
QTY
ARB PART #
50
AC POWER LEAD ZERO PLUG TYPE I
1
10910163
51
AC POWER LEAD ZERO PLUG TYPE B
1
10910164
52
AC POWER LEAD ZERO PLUG TYPE F
1
10910165
53
AC POWER LEAD ZERO PLUG TYPE D
1
10910166
54
AC POWER LEAD ZERO PLUG TYPE G
1
10910167
55
DC POWER SOCKET ZERO
1
10910168
56
AC POWER SOCKET ZERO
1
10910169
57
DISPLAY PANEL LOOM ZERO
1
10910199
58
TERMINAL COVER CAPS ZERO
1
10910200
59
DC INTERNAL WIRING KIT ZERO
1
10910201
60
BLUETOOTH JUMPER
1
10910203
61
OWNERS MANUAL ZERO AUS/USA
1
10910214
62
COMPRESSOR GROUND WIRE ZERO
1
10910215
63
LID SEAL ZERO 36/44L
1
10910148
64
LID SEAL ZERO 60/69/73L
1
10910149
65
LID SEAL ZERO 105L
1
10910150
66
LID SEAL ZERO 96L
1
10910151
67
POWER SOCKET DECAL ZERO REAR
1
10910152
68
POWER SOCKET DECAL ZERO FRONT
1
10910153
69
DISPLAY PANEL TOUCHPAD DECAL (DUAL ZONE)
1
10910154
70
DISPLAY PANEL TOUCHPAD DECAL (SINGLE ZONE)
1
10910155
71
DISPLAY PANEL PCB ZERO (SINGLE ZONE)
1
10910156
72
DISPLAY PANEL PCB ZERO (DUAL ZONE)
1
10910157
73
MAIN PCB ZERO (SINGLE ZONE)
1
10910158
74
MAIN PCB ZERO (DUAL ZONE)
1
10910219
75
INTERIOR LIGHT PCB ZERO
1
10910170
76
DC SOCKET COVER ZERO
1
10910198
77
VENT SHROUD SCREWS BASE ZERO
1
10910205
78
FRIDGE BASE PLUG ZERO
1
10910212
79
THERMISTER ZERO
1
10910213
80
AC/DC TRANSFORMER ZERO (AC RECTIFIER)
1
10910160
4.3 Minimum stocked spare parts
ARB recommends that the following parts be stocked by all ARB fridge freezer service agents. As these
parts are consumed, they should be replaced as soon as possible to ensure that all items are on hand
when required. For replacement parts, contact your regional ARB office.
Parts not listed in the table below can be ordered from ARB as required.
The item numbers in the table below correspond with the item numbers in the table in section 4.1 and
the exploded drawing in section 4.2.
ITEM
ARB MAIN DESCRIPTION
QTY
ARB PART #
9
COMPRESSOR CONTROL UNIT ZERO 36L/44L
10910161
10
COMPRESSOR CONTROL UNIT ZERO 60L/69L/73L/96L/105L
10910162
73
MAIN PCB ZERO (SINGLE ZONE)
10910158
74
MAIN PCB ZERO (DUAL ZONE)
10910219
8
CONDENSER FAN ZERO
10910159
71
DISPLAY PANEL PCB ZERO (SINGLE ZONE)
10910156
72
DISPLAY PANEL PCB ZERO (DUAL ZONE)
10910157
75
INTERIOR LIGHT PCB ZERO
10910170
11
INTERIOR LIGHT LENSE ZERO
10910171
26
DRAIN PLUG
10910186
FUSE AC 100-240V 6.3AMP –F6.3L250V
FUSE DC GLASS 12/24V 10AMP –6G10A
ARB DC POWER CORD
10910076

Revision Date – 15/07/2020 page 8
5 TOOLS REQUIRED
5.1 Basic servicing
The following tools will be required to perform general non-refrigeration based servicing of the fridge.
Basic tool kit
Phillips head screw drivers (various sizes)
Flat blade screw drivers (various sizes)
Needle nosed plies
Wire (side) cutters
Vice grips
Sharp knife
Allen key set
Cable ties
12V power supply
Multimeter (with the following ranges)
DC voltage (0 - 24V)
AC voltage (100 - 240V)
Resistance (0.5 Ω – 50 kΩ)
Temperature +10°C (+50°F) to -18°C (0°F)
Jumper cable
Short length of insulated wire terminated with spring loaded clips or push-on
connectors at each end.
The following tools will be required to perform specific non-refrigeration based servicing of the fridge
Check vehicle wiring (refer to section 8.1)
DC Voltage Drop tester (available from ARB – part # 10910040)
Replace serviceable thermistor (refer to section 9.10)
Heat transfer paste (available from Jaycar p/n NM-2012)
5.2 Servicing the refrigeration system
It is expected that a refrigeration mechanic who is servicing the refrigeration system will have the
appropriate equipment to pressure test, evacuate and charge the system with the specified refrigerant in
accordance with local or State handling practices.

Revision Date – 15/07/2020 page 9
6 TROUBLESHOOTING
6.1 Check light codes.
Display “E0” and Check light is solid ON – Temperature sensor issue:
 For temporary use, engage the Emergency Override to operate the fridge freezer.
 Please contact ARB for assistance at your earliest convenience.
Display “E1” and Check light flashes once every 4 seconds – Low supply voltage:
The battery protection system has turned the fridge freezer off because low voltage has been
detected.
 Check with a different power source, for example a different vehicle or 240V AC power. If changing
the power source fixes the issue, the possible cause could be the original power source.
 Check that the correct battery protection setting has been selected to suit the customer’s
requirements.
 Check the vehicle wiring is adequate.
- For cable lengths up to 6m (20’), ARB recommends a minimum automotive cable size of 6 mm
(4.5 mm2).
- For cable lengths greater than 6m (20’), ARB recommends that you consult a qualified
technician for advice on the correct wire size.
 Check that all terminals and joints are clean and in good condition.
 Check that the battery voltage at the socket is above the set cut-out voltage (refer to section 6.6).
To ensure that voltage drop is accounted for when measuring this voltage, refer to section 8.1.
NOTE: The battery protecting system only controls 12 and 24V DC supplies. To confirm that the
fridge freezer is operating correctly, connect the fridge freezer to a standard 100-240V AC supply.
Display “E2” and Check light flashes 2 times every 4 seconds – Fan issue:
The control system has turned the fridge freezer off because the fan is drawing more than 0.6 amp
while the compressor is running. This could be because the fan is running slowly or not running at all.
 Check that the fan is not obstructed or dirty.
Display “E3” and Check light flashes 3 times every 4 seconds –Compressor start issue:
The compressor will not start because the refrigerant system has become unbalanced. This can
occur when the power to the fridge freezer is briefly interrupted.
 Turn the fridge freezer off and disconnect it from its power supply.
 Allow the fridge freezer to stand for 10 to 15 minutes to allow the system to equalise.
 Reconnect the fridge freezer to the power supply and turn it on.
 Compressor control box fault.
 Compressor fault.
Display “E4” and Check light flashes 4 times every 4 seconds – Low motor speed:
The compressor motor is running below its minimum maintainable speed. This could be because
the refrigerant system has been overcharged.
Consult a refrigeration mechanic to check that the system is charged with the correct amount of
refrigerant.
 Move the unit to a lower ambient temperature.
 Clean vents and ensure clean air flows over the compressor.
 Fan fault.
Display “E5” and Check light flashes 5 times every 4 seconds – Over temperature:
The fridge freezer has stopped operating because the control unit has become too hot.
 Check to ensure that there is adequate ventilation around the control unit and the compressor.
 Check that the fan is operating correctly. The fan must always be running when the compressor is
running.
 The fridge freezer may be operating in extremely high ambient temperatures. For example in a
sealed stationary vehicle that is parked in the direct sunlight. Try to improve the ventilation around
the fridge freezer or shield it from direct sunlight.
 Fan fault.

Revision Date – 15/07/2020 page 10
TROUBLESHOOTING
6.2 DC Power Supply
Symptom
Possible Cause(s)
Suggested Action(s)
Fridge does not run when
using a 12/24V DC power
supply.
12/24V DC plug fuse has
blown.
Replace 12/24V DC plug fuse (refer to
section 9.11.
Fault with 12/24V DC fridge
power lead.
Check continuity of lead from plug to
socket. Replace lead if faulty or damaged.
Poor connection of plug to
socket in back of fridge.
Check that plug is correctly installed into
socket in back of fridge.
NOTE: A poor connection can cause
high resistance and a large
voltage drop. This can cause
the battery protection system to
activate prematurely.
No power to supply socket
from power source (eg
vehicle battery).
Check that vehicle wiring is correct and
that power is available at the outlet socket.
The DC supply voltage is
below the minimum voltage
needed to operate the fridge.
Connect the fridge to a 12 or 24V DC
power supply. Check the supply voltage.
NOTE: The compressor control unit
and digital display will not
operate if the supply voltage is
below approximately 7V DC.
The polarity of the fridge
power circuit is wired
incorrectly.
This means the positive (+)
and negative (-) wires are
connected back to front.
Check the DC wiring circuit to ensure the
polarity (“+” and “–“) is correct.
NOTE: The compressor control unit has
inbuilt polarity protection and
will not function if the polarity is
incorrect.
Poor electrical connection
inside the fridge between the
power socket and the
compressor control unit.
Check connections between the DC socket
and the “+” and “-” terminals on the
compressor control unit.
Check that approximately 12 or 24V DC is
measured at the “+” and “-“ terminals.

Revision Date – 15/07/2020 page 11
TROUBLESHOOTING
DC Power Supply (continued)
Symptom
Possible Cause(s)
Suggested Action(s)
Fridge does not run when
using a 12/24V DC power
supply.
Faulty compressor control
unit.
Test compressor control unit (refer to
section 8.3). If compressor does not run
during test, replace compressor control
unit (refer to section 9.5) and repeat test.
Faulty control panel circuit
board.
Test compressor control unit (refer to
section 8.3). If control unit is ok, test fridge
with new control panel circuit board and
replace if necessary (refer to section 9.4).
Faulty main circuit board.
Test compressor control unit (refer to
section 8.3). If control unit is ok, test fridge
with new main circuit board and replace if
necessary (refer to section 9.6).
Faulty thermistor.
Test compressor control unit (refer to
section 8.3). If control unit is ok, test fridge
with new thermistor and replace if
necessary (refer to section 9.10).
Fault within main wiring loom.
Test continuity of wiring loom from main
circuit board to control panel circuit board.
If fault identified and unrepairable, contact
ARB for advice.
Fridge will not run when DC
input voltage exceeds 13.8V
(eg When vehicle is
running)
Faulty main circuit board.
Replace main circuit board (refer to section
9.6) and retest.

Revision Date – 15/07/2020 page 12
TROUBLESHOOTING
DC Power Supply (continued)
Symptom
Possible Cause(s)
Suggested Action(s)
12/24V DC fridge lead plug
fuse blows repeatedly.
Fault within 12/24V DC fridge
power lead.
Check continuity of lead from plug to
socket. Replace lead if faulty or damaged.
Incorrect fuse used in plug.
Install the correctly rated fuse. The correct
rating is 10Amp (refer section 9.11).
Short circuit between “+” and
“-” terminals on compressor
control unit.
Check for short circuits between the “+”
and “-” terminals on the compressor
control unit.
Compressor stops running,
“E1” displayed and Check
light flashes twice every 4
seconds.
Compressor has stopped
running because battery cut-
out voltage has been
reached.
Check that correct battery protection
setting is selected (refer section 6.6).
Check that vehicle wiring is adequate.
Refer to section 8.1.
Check battery voltage and voltage at
supply socket.
NOTE: Voltage readings must be taken
with a load on the circuit to
allow for voltage drop within the
circuit (refer to section 8.1).
Check that plug is correctly installed into
socket in back of fridge.
Check that plug is correctly installed into
supply socket in vehicle.
Test fridge on 100-240V AC to confirm
correct operation of fridge.
Intermittent power supply
to fridge.
Poor connection of plug into
socket in back of fridge.
Check that plug is correctly installed into
socket in back of fridge.
Check that the plug makes firm connection
with the terminals inside the fridge socket.
If fit is loose, test fridge with new power
lead. If symptom resolved, replace power
lead.
Poor connection of plug into
supply socket (eg vehicle
accessories socket).
Check that plug is correctly installed into
the supply socket.
Compressor has stopped
running because battery cut-
out voltage has been
reached.
Check that correct battery protection
setting is selected (refer section 6.6).
Check that vehicle wiring is adequate.
Refer to section 8.1.

Revision Date – 15/07/2020 page 13
TROUBLESHOOTING
DC Power Supply (continued)
Symptom
Possible Cause(s)
Suggested Action(s)
Fridge runs but digital
display is not visible.
Faulty control panel circuit
board.
Test with new control panel circuit board
(refer to section 9.4). If symptom resolved,
replace circuit board.
Fridge runs but cannot
change target temperature.
Faulty control panel circuit
board.
Test with new control panel circuit board
(refer to section 9.4). If symptom resolved,
replace circuit board.
Fridge does not run, “E2”
displayed and Check light
flashes twice every 4
seconds.
The fan is not connected to
the compressor control unit.
Check the fan wiring to ensure the “+ve”
and “–ve” fan wires are correctly
connected to the compressor control unit
(refer section 9.9).
Faulty fan.
Test with new cooling fan (refer to section
9.9). If symptom resolved, replace fan.
NOTE: The fan must be running whenever
the compressor is running.
Faulty compressor control
unit.
Test compressor control unit (refer to
section 8.3). If symptom resolved, replace
control unit (refer to section 9.5).
Interior cabinet light does
not work.
Interior LED is faulty.
Replace LED.
No power to fridge.
Check that either 12/24V DC or 100-240V
AC power is being supplied to the fridge.
Faulty main circuit board
Test operation of light with new main
circuit board. If symptom resolved, replace
circuit board.
Faulty light switch
Replace cabinet assembly.

Revision Date – 15/07/2020 page 14
TROUBLESHOOTING
6.3 AC Power Supply
Symptom
Possible Cause(s)
Suggested Action(s)
No power to fridge when
using a 100-240V AC power
supply.
Poor connection of plug to
back of fridge.
Check that plug is correctly installed into
the socket in back of fridge.
Device fuse in back of fridge
cabinet has blown.
Replace device fuse. Refer to section
9.12.
No power to supply socket
from AC power source.
Check that there is power to the supply
socket from the AC power source.
NOTE: If using a poor quality power
generator, it is possible that the
supply voltage could be above or
below the 100-240V AC power
range and may not be a pure,
non-fluctuating sine wave.
Poor electrical connection
inside the fridge between the
AC power socket and the
compressor control unit.
Check AC electrical wiring within the
fridge.
NOTE: All AC electrical work should be
carried out by a qualified
electrician.
Faulty main circuit board.
Test with new main circuit board. If
symptom resolved, replace circuit board
(refer to section 9.6).
Faulty compressor control
unit.
Test compressor control unit on AC power
(refer section 8.3). Replace if necessary.
Test with new compressor control unit. If
symptom resolved, replace compressor
control unit (refer to section 9.5).
Device AC fuse repeatedly
blows.
Short circuit in 100-240V AC
fridge cable.
Check continuity of lead from plug to
socket. Replace lead if faulty or damaged.
Short circuit between
terminals “L” and “N” on
compressor control unit.
Check for short circuit between the “L”
and “N“ terminals on the compressor
control unit.
Unregulated and/or
fluctuating power supply.
For example
From an engine driven
generator.
Ensure that the generator has a voltage
regulator and is supplying a standard,
pure sine wave AC voltage without
fluctuation in voltage or frequency
NOTE: Ensure that the fridge is turned
off before starting or stopping
the generator.
Fault with compressor control
unit.
Test with new compressor control unit &
replace if necessary (refer section 9.5).

Revision Date – 15/07/2020 page 15
TROUBLESHOOTING
6.4 Cooling
Symptom
Possible Cause(s)
Suggested Action(s)
Fridge does not cool.
Compressor runs.
Poor ventilation.
Check that there is sufficient clearance
around the fridge and that the fan is not
obstructed.
Compressor starts and stops
because the battery
protection system is active.
Error light flashes once every
4 seconds.
Check that the correct battery protection
setting is selected (refer section 6.6).
Check that vehicle wiring is adequate
(refer to section 8.1).
NOTE: In the rear of a vehicle, the customer may be unaware that
this is occurring.
The lid seal is damaged or
missing.
Check seal is installed correctly into lid
and it is in good condition. Replace seal if
damaged or missing.
Leak in refrigerant system.
Look for visible oil leaks around the
refrigeration lines, compressor and
condenser. If a leak is detected, contact a
qualified refrigeration mechanic for
service advice.
If no leak detected, contact a qualified
refrigeration mechanic and request that
the system is pressure tested.
Blockage within the
refrigeration system.
Contact a qualified refrigeration mechanic
for service advice.
Fridge does not cool.
Compressor does not run.
Faulty compressor control
unit.
Test compressor control unit (refer to
section 8.3) and replace if necessary
(refer to section 9.5).
Faulty control panel circuit
board.
Test compressor control unit (refer to
section 8.3). If control unit ok, test fridge
with new control panel circuit board and
replace if necessary (refer section 9.4).
Faulty main circuit board.
Test compressor control unit (refer to
section 8.3). If control unit is ok, test with
new main circuit board and replace if
necessary (refer to section 9.6).
Faulty thermistor.
Test compressor control unit (refer to
section 8.3). If control unit is ok, test with
new thermistor and replace if necessary
(refer to section 9.10).

Revision Date – 15/07/2020 page 16
TROUBLESHOOTING
Cooling (continued)
Symptom
Possible Cause(s)
Suggested Action(s)
Temperature display is not
accurate with cabinet
temperature.
Time lag has not been
allowed for.
Allow the fridge to reach the set
temperature and cycle a few times before
assessing accuracy of temperature.
NOTE: A display temperature within 2-
3°C (3.6-5.4°F) of the actual
temperature at the base of the
fridge is within normal on/off
cycle temperature variation.
Frozen items have been
placed directly on top of
thermistor.
Rearrange items in fridge so that frozen
items are not located directly on top of the
thermistor.
NOTE: The thermistor is located in the
base of the fridge directly under
the centre of the plastic liner.
Internal temperature
correlation settings
inaccurate.
Adjust the internal temperature correlation
setting (refer to section 8.5).
NOTE: This should not be necessary
unless the thermistor has been
replaced.
Items freeze with fridge set
to warmest setting.
Faulty thermistor.
Test thermistor (refer to section 8.4) and
replace if necessary (refer section 9.10).
Faulty control panel circuit
board.
Test fridge with new control panel circuit
board and replace if necessary (refer to
section 9.4).
Faulty main circuit board
Test fridge with new main circuit board
and replace if necessary (refer to section
9.6).
Fridge does not reach
target temperature.
Fridge is operating at its
maximum cooling capacity in
extreme ambient
temperatures.
The maximum cooling capability of the
system is a reduction of 50°C (122°F)
below ambient temperature.
For example
In ambient temperatures above 32°C
(73°F), the system may not cool to a
cabinet temperature of -18°C (0°F).
Large temperature
difference between the top
and bottom of fridge.
The temperature within the
cabinet will vary as the
compressor cycles on and off.
The temperature difference
will vary depending on factors
like how the fridge is loaded
and how often it is opened.
Advise the customer that some
temperature variation is normal within the
fridge.
NOTE: The temperature difference can
increase as the cabinet
temperature decreases.

Revision Date – 15/07/2020 page 17
TROUBLESHOOTING
Cooling (continued)
Symptom
Possible Cause(s)
Suggested Action(s)
Fridge cools but
compressor runs
continuously.
Poor ventilation.
Check that there is sufficient clearance
around the fridge and that the fan is not
obstructed.
Fridge is operating at or near
the thermal capacity of
system.
The thermal capacity of the system is
50°C (122°F) below ambient temperature.
The lid seal is damaged or
missing.
Check that the seal is installed correctly
into the lid and that it is in good condition.
Replace the seal if it is damaged or
missing.
Faulty thermistor.
Test thermistor (refer to section 8.4) and
replace if necessary (refer section 9.10).
Faulty control panel circuit
board.
Test fridge with new control panel circuit
board and replace if necessary (refer to
section 9.4).
Faulty main circuit board.
Test fridge with new main circuit board
and replace if necessary (refer to section
9.6)
Insufficient charge of
refrigerant in compressor
system.
Contact a qualified refrigeration mechanic
and request that the system is pressure
tested.
Partial blockage within the
refrigeration system.
Contact a qualified refrigeration mechanic
for service advice.
Noisy compressor
Compressor is loose or not
correctly mounted.
Inspect the compressor to ensure that it is
correctly mounted. Replace compressor
mounting feet if necessary.
Noise from inside compressor
when fridge experiences high
movement and/or vibration.
This noise is normal when the fridge
experiences high movement and/or
vibration.
System is low on refrigerant.
Perform checks listed above under
“Fridge does not cool. Compressor Runs”.
Digital display shows
temperature values in the
wrong units.
The internal settings within
the control panel are
incorrect.
Refer to the owner’s manual for directions
on changing temperature units between
°C and °F.

Revision Date – 15/07/2020 page 18
TROUBLESHOOTING
6.5 General
Symptom
Possible Cause(s)
Suggested Action(s)
Latch does not easily
disengage from lid.
The seal is causing the lid to
sit away from the fridge
cabinet.
Press down on the lid slightly to help
disengage the latch from the lid.
Noisy fan.
Obstruction in fan.
Remove foreign material from the fan and
retest system.
Faulty fan.
Remove fan from fridge and test. If fan is
identified as faulty, replace with new fan
(refer to section 9.9).
Lid opens during transit.
The latch was not closed
correctly.
Advise customer that latch must be
correctly closed before transportation.
Faulty latch.
Inspect latch and latch pivot for damage.
Lid will not open when
fridge is running.
The air inside the fridge has
cooled forming a negative
pressure within the cabinet.
This can occur when the
fridge is left running while
empty.
Remove the drain plug to allow the
pressure inside the cabinet to equalise
with the ambient air.
Advise customer to remove drain plug
from drain if the fridge is to be left running
with nothing inside it.
HINT: Dislodge the drain plug from the
fridge cabinet by pushing it up
from under the fridge use a small
round rod or similar.
Hinge noisy during
operation.
The hinge sockets have
become dirty.
Remove lid from body of fridge.
Clean hinge sockets.

Revision Date – 15/07/2020 page 19
TROUBLESHOOTING
6.6 Battery Protection Settings
The ARB Zero Fridge Freezer is fitted with a battery monitor to control the level of discharge of
the supply battery. The battery monitor has three settings; HIGH, MEDIUM and LOW. When set
to HIGH, the battery monitor will provide maximum protection for the battery against excessive
discharging. When set to LOW, the battery monitor will allow maximum use of the energy stored
in the battery. The table below shows the voltage cutout levels for the three battery monitor
settings.
LOW (Lo)
MEDIUM (nE)
HIGH (HI)
Switch off voltage – 12V DC
10.1 ± 0.3 V
11.4 ± 0.3 V
11.8 ± 0.3 V
Restart voltage – 12V DC
11.1 ± 0.3 V
12.2 ± 0.3 V
12.6 ± 0.3 V
Switch off voltage – 24V DC
21.5 ± 0.3 V
22.5 ± 0.3 V
23.0 ± 0.3 V
Restart voltage – 24V DC
23.0 ± 0.3 V
24.0 ± 0.3 V
24.5 ± 0.3 V
To change the battery protection level:
 Turn the fridge freezer ON.
 Press three times (four times for Dual Zone) to display current battery protection
setting.
 Press or to change the battery protection voltage between High (HI),
Medium (nE) and Low (Lo).
 After 5 to 6 seconds of inactivity, the battery protection voltage will be set and the
display will show the current cabinet temperature.
NOTE: The battery protecting system only controls 12 and 24V DC supplies. To confirm that the
fridge freezer is operating correctly, connect the fridge freezer to a standard 100-240V AC
supply.