Whirlpool Multibras ARC8140IX User manual

MSEX0105i – Electronic No Frost Refrigerator Bottom Mount/ Dual Fan - Maestro High 2
INDEX
1 – IDENTIFICATION.........................................................................................................................................3
2 – TECHNICAL INFORMATION.......................................................................................................................4
2.1 – Technical Specifications...........................................................................................................4
2.2 – Capacity, Weight and Dimensions...........................................................................................4
2.3 – Maximum weight under Components......................................................................................4
3 –AESTHETICS CHARACTERISTICS.............................................................................................................5
4 – USE CHARACTERISTICS...........................................................................................................................6
4.1 – Keys selection on Control Panel..............................................................................................6
4.2 – Functions & Indicative Icons on the LCD Display..................................................................7
4.2.1 – For Refrigerator Compartment................................................................................7
4.2.2 – For Freezer Compartment........................................................................................8
4.2.3 – Informative and Alarm Icons...................................................................................9
5 – FUNCTIONAL CHARACTERISTICS..........................................................................................................9
5.1 – Electronic Control....................................................................................................................10
5.2 – Interface Board.........................................................................................................................12
5.3 – Reed-Switch Board..................................................................................................................12
5.4 – Freezer Fan Motor....................................................................................................................13
5.5 – Refrigerator Fan Motor............................................................................................................14
5.6 – Temperature Control...............................................................................................................14
5.6.1 – Refrigerator Temperature Sensor – NTC..............................................................15
5.6.2 – Freezer Temperature Sensor – NTC......................................................................17
5.6.3 – Defrost Temperature Sensor – NTC......................................................................17
5.7 – Defrost System.........................................................................................................................19
5.8 – Alarm System...........................................................................................................................20
5.8.1 – Caution Alarm.........................................................................................................20
a) Party Mode Alarm (exceeded time) ................................................................20
b) Anti Bacteria Filter Alarm (replacement time)...............................................20
c) Open Door Alarm..............................................................................................21
d) Temperature Alarm..........................................................................................21
5.8.2 – Service Call Alarm..................................................................................................22
a) Communication Failure Alarm........................................................................22
b) Temperature Sensor (Refrigerator, Freezer & Defrost) failure....................22
5.9 – Air Flow.....................................................................................................................................23
5.9.1 – Air Circulation on Freezer Compartment.............................................................23
5.9.2 – Air Circulation into Refrigerator Compartment...................................................25
6 – OTHERS COMPONENTS..........................................................................................................................26
6.1 – Refrigerant Fluid and Drier Filter............................................................................................26
6.2 – Cabinet......................................................................................................................................26
6.3 – Compressor..............................................................................................................................27
6.4 – Capacitor..................................................................................................................................27
6.5 – Condenser................................................................................................................................27
6.6 – Evaporator................................................................................................................................27
6.7 – Defrost Heater..........................................................................................................................29
6.8 – Thermofuse..............................................................................................................................29
6.9 – Doors and Gaskets..................................................................................................................29
6.10 – Refrigerator Lamp..................................................................................................................30
6.11 – Rollers and Leveler Feet.......................................................................................................30
6.12 – Clicking Bushings..................................................................................................................30
6.13 – Vegetable Drawer with Humidity Control............................................................................30
6.14 – Easy Ice System.....................................................................................................................30
6.15 – Anti-Bacteria Filter.................................................................................................................31
7 – COMPONENT TESTS................................................................................................................................31
7.1 – Electronic Control / Self-Test Routine...................................................................................31
7.2 – Interface Board – LCD Display Routine.................................................................................32
8 – DOOR REVERSAL.....................................................................................................................................33
9 – REQUIRED TOOLS FOR SERVICING......................................................................................................38
10 – WIRING DIAGRAM..................................................................................................................................39
11 – FAILURE CORRECTION CHART (TROUBLESHOOTING)....................................................................40

MSEX0105i – Electronic No Frost Refrigerator Bottom Mount/ Dual Fan - Maestro High 3
1 – IDENTIFICATION :
1.1 – Multibras Version
W R E 48 D R Y WY 00 DESCRIPCION
ENGING.
DIGIT 00= Lauching
DESTINATION WY= Turkey
VOLTAGE Y= 230V / 50Hz
COLOR
B= White color (painted)
S= Silver/ Aluminium color (painted)
R= Stainless steel, finishing
VERSION D= 4oVersion (for this model, this is the first version)
CAPACITY 48=480 liters, 44=440 liters (commercial)
TYPE E= Bottom Mount (Combi) No Frost, Dual Fan
PRODUCT R= Refrigerator
BRAND W= WHIRLPOOL
1.2 – Multibras Serial Number
X X X XXXXXX DESCRIPCION
4ODIGIT Serial Number (Sequential manufacturing number)
3ODIGIT Manufacturing Year
2ODIGIT Manufacturing Month
1ODIGIT Manufacturing Plant (Factory)
The first digit indicates the Factory Plant (in Brasil), identified by a letter as follows:
C– Rio Claro Plant P– São Paulo Plant J– Joinville Plant
I– Imported Products M– Manaus Plant
The second digit indicates the manufacturing month of the product:
A– January D– April G– July J– October
B– February E– May H– August L– November
C– March F– June I– September M– December
The third digit indicates the manufacturing year of the product:
8– 1998 1– 2001 4– 2004 7– 2007
9– 1999 2– 2002 5– 2005 8– 2008
0– 2000 3– 2003 6– 2006 9– 2009
The following six digits indicate the product manufacturing sequential:
Example: 000001, 000002, .....

MSEX0105i – Electronic No Frost Refrigerator Bottom Mount/ Dual Fan - Maestro High 4
2 – TECHNICAL INFORMATION
2.1 – Technical Specifications
Characteristics ARC8140IX
Volts (V) 230
Voltage oscillation - allowed (V) 160 to 260
Frequency (Hz) 50
Current (A) 0,6
Power (W) 120
Tension Stabilizer recommended (W) 1000
Circuit Breaker (A) 10
Freezing Capacity (kg/24h) 10,5
2.2 – Capacity, Weight and Dimensions
Characteristics ARC8140IX
Height 1874
Dimensions (mm) Width 709
Depth 728
Weight (Kg) Unpacked 93
Refrigerator 305
Net Capacity (liters) Freezer 120
2.3 – Maximum weight under Components (Kg)
Ice bin, freezer 1,5
Wire Shelf, freezer (1st )13
Fast Freezing compartment 15
Wire Shelf, freezer (2nd )17
Drawer, freezer (1st )18
Drawer, freezer (2nd )12
Door Shelf, freezer (each one) 4
Extra-cold compartment 26
Glass Shelf, refrigerator (each one) 28
Drawer, vegetable 25
Door Shelf, 1st 3,5
Door Shelf, 2nd and 3rd (each one) 7
Door Shelf, bottles 5

MSEX0105i – Electronic No Frost Refrigerator Bottom Mount/ Dual Fan - Maestro High 5
3 – AESTHETICS CHARACTERÍSTICS
Their main characteristics are: Easy Ice system with automatic feeder, External Handle, Electronic
Control for both Compartments (Refrigerator - RC and Freezer - FC) with LCD Display & Skin
Condenser (Clinched Condenser).
1- Lamp, refrigerator
2- Glass shelf (3)
3- Wind Flow System (air outlets)
4- Extra-cold compartment
5- Humidity Control
6- Vegetable Drawer
7- Vegetable separator
8- Easy Ice System with automatic feeder
9- Fast Freezing compartment
10- Drawer, freezer (2)
11- Rollers (4)
12- Leveler Feet (2)
13- External LCD Display (FC & RC Control)
14- Eggs tray
15- Spacer bin
16- Door Shelf, refrigerator
17- Door Shelf, bottles
18- Door Shelf, freezer (2)
19- Plinth
1
2
3
4
14
16
5
8
9
10
6
18
19
17
12
11
7
15
13

MSEX0105i – Electronic No Frost Refrigerator Bottom Mount/ Dual Fan - Maestro High 6
4 – USE CHARACTERISTICS
4.1 – Keys selection on the Control Panel
This product has 2 differents electronic temperature controls for which compartment, both located at the
Refrigerator Door on the Interface Panel – LCD Display.
When the product is connected for the first time to the Electrical power supply, the digital panel (LCD)
light up for 2 seconds (all icons will appear) and the buzzer will beep once, then the presentation mode
will be activated (around 10 seconds), after that, 5oCpre-selected Refrigerator temperature will appear
and the real freezer temperature will start blinking on Freezer temperature icon followed by an Alarm
“BEEP” & Caution Alarm Icon. To disable the sound Alarm, keep OK key pressed for 3 seconds and 3
dashes will replace the real temperature until it reaches –12°C, when – 18oCpre-selected Freezer
temperature will appear. At this moment all functions will be deactivaded, therefore, when one of the
doors is opened, it will assume the 6th Sense function.
a) On key
Key for turning the product on, when it is in the Stand-by (Off) mode
If the product is disconnected from the electrical power supply during
operation, or in case of lack of energy, it will assume the position On when
re-connected, or when the power returns.
b) Stand-by / Off key
Key for turning the product off when it is in its normal mode.
If the product is disconnected from power during operation in Stand-by
(Off) mode, it will assume the "Off" position when re-connected.
Whenever it is Off/ Stand-by, the display will show 3 horizontal traces on
the Freezer display and 2 on the Refrigerator display.
c) Menu key
Select / Disable the several product functions, as well as Temperature
Levels for the Freezer and Refrigerator (see functions details below). The
available options will be shown on the Display on each touch on this key. They will flash until
confirmation with the OK key.
Note: The function/program selection will always have to be confirmed with the OK key (see details
below). If it is not confirmed (OK key), after 5 seconds it will return to the prior programming.
d) ”+” Temperature level key
It selects the Temperature level to warmer in the Freezer compartment or
in the Refrigerator compartment, depending on the selection chosen with
the menu Key.
e) ”–” Temperatura leve key
It selects the Temperature level to colder in the Freezer compartment or in
the Refrigerator compartment depending on the selection chosen with the
menu Key.
f) OK key
It confirms the selection of the desired function previously programmed with
the Menu or Temperature Level Keys (+/-).
It also works as Off Sound Alarm – Beeper.

MSEX0105i – Electronic No Frost Refrigerator Bottom Mount/ Dual Fan - Maestro High 7
4.2 – Functions & Indicative Icons on the LCD Display
4.2.1. For Refrigerator Compartment
•Temperature selection for the Refrigerator Compartment
It can be selected degree by degree (positive temperature) for the
Refrigerator Compartment from 1º C (maximum – colder ) to 7º C
(minimum – less cold)
LEVEL USE RECOMENDATION
7
Recommended to cold days, when there is not much food
in the refrigerator and occasional door opening.
4
Recommended to intermadiate situation, normal use; pleasant days
(not much hot), food stored and door opening in the medium condition
1Recommended to hot days, when there is a lot of food stored
in the refrigerator and frequent door opening.
Note: # Additional to the levels above indicated, more 4 levels are available (levels "2 / 3 and 5 / 6 "), that can be
used according with the consumer needs;
•Fast Cooling
This function allows a quick food cooling in an efficient way,
without changing the food characteristics.
When the Fast Cooling is activated it will be kept on for 6 hours
and then it will be automatically turned off returning to the previously selected parameters. If it is
necessary to interrupt the Fast Cooling function, just press the Menu key, select the Fast Cooling icon
and confirm (OK key). It will be disabled.
Remarks:
This function disable automatically after 6 hours, then returning to the previously selected parameters.
For this function, the Compressor will be continuously activated, and the refrigerator temperature Control
will be set at the maximum level, it means coldest mode (the LCD display will keep showing the
previously selected temperature), while the Freezer temperature Control will be unchanged, and its
temperature values will change according to the display pre-selected values.
•Vacation Mode
For a long time absence, when the open-door frequency is
“null”, this function can be used, in order to save power
energy. In this function, the Compartments (Refrigerator &
Freezer) temperature levels are set at the minimum level , it means, warmest mode (the LCD display will
keep showing the previously selected temperature), and the cool air passage to the refrigerator
Compartment will be reduced.
Attention:
Whenever this function is activated, sensitive/perishable food should be removed from the refrigerator, in
order to avoid their deterioration.
This function does not disables automatically, and it must be disabled in the Menu. In this case, the
product will work as the last programming of Freezer & Refrigerator temperature.
Important: This function does not disables automatically.
The Vacation Mode, also will be deactivated when selected other function or when one of the doors is
opened after 30 minutes of their programming.
Note: During the first 30 minutes the Vacation Mode is not deactivated by openning door.

MSEX0105i – Electronic No Frost Refrigerator Bottom Mount/ Dual Fan - Maestro High 8
•Open Refrigerator door Icon
Whenever the refrigerator Door is open, this icon will activate,
showing the door status. If it is flashing, it means the product is
in the Alarm mode (see Alarm system – item).
4.2.2. For Freezer Compartment
•Temperature selection for the Freezer Compartment
It can be selected degree by degree (negative temperature) from
–18º C (minimum – less cold) to –24º C (maximum - colder).
LEVEL USE RECOMENDATION
-18
Recommended to cold days, when there is not much food
in the freezer and occasional door opening.
-21
Recommended to intermadiate situation, normal use; pleasant days
(not much hot), food stored and door opening in the medium condition
-24 Recommended to hot days, when there is a lot of food stored
in the freezer and frequent door opening.
Note: # Additional to the levels above indicated, more 4 levels are available (levels "-19 / -20 and -22 / -23 "), that
can be used according with the consumer needs;
•Party Mode
It allows fast cooling for bottles (0,75 l) in the Freezer
Compartment. It works as if it was a Timer, and after 30
minutes an alarm will sound, the Caution Alarm Icon will
light and the Party Icon will flash, indicating the bottle can be
taken.
At this moment, disable manually the Party mode Function by pressing the OK key (it does not
disable automatically).
Attention:
Do not leave bottles, mainly glass bottles inside the Freezer compartment longer than 30 minutes,
because it can explode causing accidents.
If the function is not disabled after 30 minutes, the product will return to the prior parameters, but the
sound Alarm will be disabled after 10 minutes and the Caution Alarm and the Party mode icons will keep
activated until they are manually disabled with the OK key.
For this function, the Compressor and the Freezer Fan Motor will be continuously activated. The
refrigerator temperature control will keep unchanged, and its temperature levels will change according to
the display pre-selected values.
•Fast Freezing
This function allows a quick food freezing in an efficient way,
without changing their characteristics.
When the Fast Freezing is activated, it will be kept on for 18
hours, and then it will be automatically turned off, returning to the previously selected parameters. If it
is necessary to interrupt the Fast Freezing function, just press the Menu key, select Fast Freezing icon
and confirm (OK key). It will be disabled.
For this function, the Compressor and the Freezer Fan Motor will be continuously activated. The
refrigerator Temperature control will keep unchanged, and its temperature levels will change according
to the display pre-selected values.

MSEX0105i – Electronic No Frost Refrigerator Bottom Mount/ Dual Fan - Maestro High 9
•Open Freezer door Icon
Whenever the freezer Door is open, this Icon will activate,
showing the door status. If it is flashing, it means the product
is in the Alarm mode (see Alarm system – item).
4.2.3. Informative and Alarm Icons
•6th Sense
Automatic function that adjusts to the consumer use conditions,
achieving a better use of the device as well as the conservation of
the food.
This automatic adjustment is made by the Electronic Control
software, based on the differential of internal Temperatures
(Refrigerator & Freezer) versus Doors opening frequency versus the
LCD panel user’s selection, whenever one of the Doors is opened,
the software will try to be close to the user selected temperature.
Whenever the function is activated the 6th Sense icon will show on the display. If not, it means the
function is disabled and the inside temperature is close to the one selected by the user.
•Keyboard lock – “Child lock”
This function protects temperature/function selection from being
handled accidentally or by children.
To activate this function, press the +, – (Temperature level ) & OK
keys for 5 seconds, and then the lock key will appear on the display
locking the keyboard. After activating this function, other functions
cannot be programmed.
To disable this function, repeat the same operation that activates it.
•Caution Alarm Icon
This function prevents the consumer about something abnormal in
the operation or at the end of some previously programmed function
(see details in Alarm situations).
•Service Call Icon
This function, also an alarm function, is related to some possible
technical failure in the product, and can need some technical
intervention (see details in Alarm situations).
The consumer should call the Authorized Technical Service unity,
requiring the technical assistance, giving the failure code showed
in the Display, making it easier to the Technician to make a pre-
diagnosis.
5 - FUNCTIONAL CHARACTERISTICS
This refrigerator is managed by an Electronic System, mainly consisting of:
9Electronic Control
9Interface board
9Reed-switch board
9Temperature Sensors (Refrigerator , Freezer & Defrost)
9Compressor
9Freezer Fan Motor (V dc)
9Refrigerator Fan Motor (V dc)
9Defrost Heater
9Lamps

MSEX0105i – Electronic No Frost Refrigerator Bottom Mount/ Dual Fan - Maestro High 10
These components are described as shown below.
5.1. Electronic Control
The complete operation of this product is done by the Electronic Control, which executes the functions
according to the needs, turning the components on or off through received/managed signals, such as:
- Compressor On/Off
- Fan Motors (Refrigerator & Freezer) On/Off & Speed
- Defrost Heater On/Off
- Lamp, through received signals by the reed-switch board, that checks the door opening/closing.
- Receives signals from the Freezer/ Refrigerator & Defrost temperature Sensors
- Among many other functions controlled by its software.
The Electronic Control is located at the rear of the refrigerator, next to the cabinet and besides the
compressor, inside a plastic box. Cables going inside the product, using connectors that do not permit an
assembling failure do its connection to the mains and its components.
Inside, the Electronic Control is divided in 2 parts, a main Board and a line filter.
Main Board Line Filter
CN1 – Compressor and Power Cord CN2 – Load Components and Reed-Switch Board
CN3 – Temperature Sensors CN4 – Interface Board
Note: More Details, check the Wiring Diagram
WARNING
Electrostatic Discharge Risk
Do not touch the Circuit components, because you can damage, fuse/burnt or weaken the board.
Always handle the Boards by the sides/plastic holder.
Spare Parts/ stock boards must be kept in anti-static packaging.
CN3
CN2
CN4
CN1

MSEX0105i – Electronic No Frost Refrigerator Bottom Mount/ Dual Fan - Maestro High 11
- Disassembly
1. Remove the cover fastening screws. 2. Release the cover tabs.
3. Release the Board connectors. 4. Loose all other screws and remove the Electronic Control.
IMPORTANT
# Be careful when using the Multimeter
measuring probes, as they may damage the
connector terminals.
# Be careful when removing the electronic board
connectors, as they are latched.
Remove them at right angles with no side
movements
Take away on
this direction

MSEX0105i – Electronic No Frost Refrigerator Bottom Mount/ Dual Fan - Maestro High 12
5.2. Interface Board – LCD Display
The interface board has the function of interacting with the user, indicating the product
functions/programming and operation (see Use Characteristics item) always put in operation by the
Electronic Control.
- Disassembly - LCD
1. Pry the Buttons (right & left) of
the Interface.
2. Release the screws that are attaching the
Interface board;
3. Remove the Interface board 4. Disconnect the wire connector and take
out the Interface board.
WARNING
Electrostatic Discharge Risk
Do not touch the Circuit components, because you can damage, fuse/burnt or weaken the board.
Always handle the Boards by the sides/plastic holder.
Spare Parts/ stock boards must be kept in anti-static packaging.
5.3. Reed-switch Board
This Refrigerator is equipped with a switch electronic system (reed switches) that are connected to the
Reed Switch Board, located inside of the Console, on the Refrigerator frontal portion.
These switches, along two magnets, one located on the lower head of the Freezer door, and the other
on the upper head of the Refrigerator door, informs the Electronic Control which is the position of the
doors, opened or closed. This reading is done when the magnet stays away from the reed switch,
indicating that the door is opened or that it is closed, when the magnet is close to the reed switch.
Door opening management
When 1 or the 2 doors are opened, the following actions will be executed:
Freezer door opened
Freezer door Icon will switch on
Freezer and refrigerator Fan Motor will switch off.
Refrigerator door opened
Refrigerator door Icon will switch on
Refrigerator Fan Motor will switch off
Refrigerator lamp will switch on

MSEX0105i – Electronic No Frost Refrigerator Bottom Mount/ Dual Fan - Maestro High 13
- Disassembly
1. Remove both screws that are fastening the
Console
2. Release the connector and pull out the set
5.4. Freezer Fan Motor
The Freezer Fan Motor is fed by direct voltage (Vdc) and fixed to the rear cover of the evaporator
through a rubber flexible holder, that protects from occasional vibrations, and consequently noise. It is
responsible for the forced air circulation inside the product, as much the Freezer as the Refrigerator
compartment.
This component does not depend on the compressor to work, and its speed (rpm) can range according
to the function/necessity managed by the Electronic Control. The orders it performs are:
•It receives signals from the Electronic Control to turn on/off, change speed according to the
necessity/function;
•The Fan Motor always turns off when the Freezer door is opened.
When closing the door, the Electronic System re-starts controlling the activation of the Fan Motor.
Note: - Except during the Initial Test Routine (factory routine) which has priority over other functions
(see Component Tests) and keep the Fan on during this time.
- In case that one of the Doors remains open during 6min, the Freezer Fan Motor will turn on
automatically
•After a defrost or compressor start up cycle, the Fan Motor will re-start only when the temperature
differential between the Freezer and the Defrost sensors reaches 2º C, it means it is reactivated
according to the temperature, not according to the time, as it used to be in other product models.
Technical Characteristics
Nominal Tension (Vdc) Range (Vdc) Nominal
Current (a) Potency (W) Velocidade (rpm)
24 Vdc from 20,4 to 27,6 Vdc 0,14 a 3,4 W 2700 to 3300 rpm

MSEX0105i – Electronic No Frost Refrigerator Bottom Mount/ Dual Fan - Maestro High 14
5.5. Refrigerator Fan Motor
The Refrigerator Fan Motor is also fed by direct voltage (Vdc), therefore, located inside the Wind Flow,
fixed to a plastic Housing by flexible rubber holder, which avoids occasional vibrations and consequently
noise. It is responsible for the forced air circulation inside the Refrigerator Compartment.
This component does not depend on the compressor to work, and its speed (rpm) can range according
to the function/necessity managed by the Electronic Control. The orders it performs are:
•It receives signals from the Electronic Control to turn on/off, change speed according to the
necessity/function;
•The Fan Motor always turns off when the one of the doors (Freezer/Refrigerator) is opened.
When closing the door, the Electronic System re-starts controlling the activation of the Fan Motor.
Note: - Except during the Initial Test Routine (factory routine) which has priority over other functions
(see Component Tests) and keep the Fan on during this time.
- In case that one of the Doors remains open during 6min, the Freezer Fan Motor will turn on
automatically
•After a defrost or compressor start up cycle, the Fan Motor will re-start only when the temperature
differential between the Freezer and the Defrost sensors reaches 2º C, it means it is reactivated
according to the temperature, not according to the time, as it used to be in other product models.
Technical Characteristics
Nominal Tension (Vdc) Range Nominal
Current (A)
Potency (W) Velocidade (rpm)
24Vdc 20,4 to 27,6 Vdc 0,1A 2,9 W 2900 to 3500 rpm
Remark
In order to avoid the return of hot air (re-circulation air) through the Wind flow, whenever the Refrigerator
Fan Motor is "on" the Freezer Fan Motor will also be.
5.6. Temperature Control
The temperature inside the product depends on the quantity of food and the open-door frequency. The
refrigerator and freezer temperature sensors are responsible in checking the inside temperature in each
compartment, sending signals to the electronic control, and it will activate/disable the interface
components so that the inside temperature is kept next to desired, according to selected in the LCD
Display (temperature / function) or automatically by the 6th Sense mode.
The temperatures range of each compartment by graduation level are described as follows:
Level – 24 Level – 23 Level – 22 Level – 21 Level – 20 Level – 19 Level – 18
FC -20ºC to -29ºC -16ºC to -25ºC -15ºC to -24ºC -14ºC to -23ºC -13ºC to -22ºC -12ºC to -21ºC -11ºC to -20ºC
Level 1 Level 2 Level 3 Level 4 Level 5 Level 6 Level 7
RC +4ºC to +2ºC +5ºC to +3ºC +6ºC to +4ºC +7ºC to +5ºC +8ºC to +6ºC +9ºC to +7ºC +10ºC to +8ºC
Note: Reference temperatures on the Sensor body with; empty product, stabilized internal temperatures and
approximated room temperature +25oC.
COMMENTS
The temperature value is measured close to the Sensor
and not at the center of the Refrigerator or Freezer compartment.

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When the product is for the first time connected to the Electrical power supply and the initialization
routine was finished (See User Characteristics) the digital panel (LCD) will start with the factory pre-
selected temperatures:
•Freezer = 3 dashes (then, –18oC )
•Refrigerator = +5oC
If the product is disconnected during its use, or lack of energy occurs, it will assume the last
function/programming done by the user when reconnected. When this lack of power makes the Freezer
and Defrost sensors temperatures upper than +20º C, the controls will assume the pre-selected factory
temperatures.
5.6.1. Refrigerator Temperature Sensor – NTC
Located in the refrigerator compartment, attached on its support, in upper portion of the internal air duct,
the refrigerator Sensor is responsible for sending signs to the electronic control, which will command the
Refrigerator and Freezer fan motors functioning always simultaneously, that is, whenever they’re
put in action by the refrigerator sensor, they will work together.
Note: Except after the first 5.8 minutes the product was connected to the electrical power supply (see
Initial Test Routine), they will work individually.
Its actuation range will follow the temperature selection indicated at the Refrigerator Control (LCD
Panel), which the Electronic Control Software will convert following the relation:
T (ºC) R (Ω)T(ºC)R(Ω)T(ºC)R(Ω)T(ºC)R(Ω)
-50,0 181117,9 -25,0 35050,0 0,0 8758,0 25,0 2681,8
-49,5 174753,7 -24,5 34012,7 0,5 8532,5 25,5 2623,7
-49,0 168634,8 -24,0 33009,5 1,0 8323,0 26,0 2567,1
-48,5 162751,1 -23,5 32039,1 1,5 8114,7 26,5 2511,9
-48,0 157092,7 -23,0 31100,3 2,0 7912,1 27,0 2458,0
-47,5 151650,2 -22,5 30192,0 2,5 7715,3 27,5 2405,4
-47,0 146414,9 -22,0 29313,2 3,0 7524,0 28,0 2354,1
-46,5 141378,0 -21,5 28462,8 3,5 7337,9 28,5 2304,0
-46,0 136531,5 -21,0 27639,7 4,0 7157,1 29,0 2255,2
-45,5 131867,6 -20,5 26843,1 4,5 6981,2 29,5 2207,5
-45,0 127378,7 -20,0 26072,0 5,0 6810,2 30,0 2160,9
-44,5 123057,8 -19,5 25325,5 5,5 6643,9 30,5 2115,5
-44,0 118898,1 -19,0 24602,7 6,0 6482,2 31,0 2071,2
-43,5 114893,0 -18,5 23902,9 6,5 6324,9 31,5 2027,9
-43,0 111036,3 -18,0 23225,2 7,0 6171,8 32,0 1985,6
-42,5 107322,0 -17,5 22568,9 7,5 6023,0 32,5 1944,3
-42,0 103744,5 -17,0 21933,1 8,0 5878,1 33,0 1904,1
-41,5 100298,2 -16,5 21317,3 8,5 5737,2 33,5 1864,7
-41,0 96977,9 -16,0 20720,8 9,0 5600,1 34,0 1826,3
Refrigerator
Sensor

MSEX0105i – Electronic No Frost Refrigerator Bottom Mount/ Dual Fan - Maestro High 16
-40,5 93778,7 -15,5 20142,8 9,5 5466,7 34,5 1788,8
-40,0 90695,7 -15,0 19582,8 10,0 5336,8 35,0 1752,2
-39,5 87724,3 -14,5 19040,1 10,5 5210,4 35,5 1716,4
-39,0 84860,2 -14,0 18514,1 11,0 5087,4 36,0 1681,4
-38,5 82099,2 -13,5 18004,3 11,5 4967,6 36,5 1647,3
-38,0 79437,2 -13,0 17510,2 12,0 4851,1 37,0 1613,9
-37,5 76870,3 -12,5 17031,1 12,5 4737,6 37,5 1581,3
-37,0 74394,9 -12,0 16566,7 13,0 4627,1 38,0 1549,5
-36,5 72007,4 -11,5 16116,4 13,5 4519,5 38,5 1518,4
-36,0 69704,4 -11,0 15679,7 14,0 4414,7 39,0 1488,0
-35,5 67482,7 -10,5 15256,3 14,5 4312,7 39,5 1458,3
-35,0 65339,2 -10,0 14845,6 15,0 4213,3 40,0 1429,3
-34,5 63270,8 -9,5 14447,2 15,5 4116,5 40,5 1400,9
-34,0 61274,7 -9,0 14060,7 16,0 4022,2 41,0 1373,2
-33,5 59348,2 -8,5 13685,8 16,5 3930,3 41,5 1346,1
-33,0 57488,5 -8,0 13322,1 17,0 3840,9 42,0 1319,6
-32,5 55693,3 -7,5 12969,1 17,5 3753,7 42,5 1293,7
-32,0 53960,0 -7,0 12626,6 18,0 3668,7 43,0 1268,4
-31,5 52286,3 -6,5 12294,2 18,5 3585,9 43,5 1243,6
-31,0 50670,0 -6,0 11971,6 19,0 3505,3 44,0 1219,4
-30,5 49108,9 -5,5 11658,4 19,5 3426,6 44,5 1195,8
-30,0 47601,1 -5,0 11354,4 20,0 3350,0 45,0 1172,6
-29,5 46144,4 -4,5 11059,2 20,5 3275,3 45,5 1150,0
-29,0 44737,1 -4,0 10772,7 21,0 3202,5 46,0 1127,9
-28,5 43377,3 -3,5 10494,4 21,5 3131,5 46,5 1106,2
-28,0 42063,2 -3,0 10224,2 22,0 3062,3 47,0 1085,1
-27,5 40793,2 -2,5 9961,7 22,5 2994,8 47,5 1064,4
-27,0 39565,6 -2,0 9706,8 23,0 2929,0 48,0 1044,1
-26,5 38379,0 -1,5 9459,2 23,5 2864,9 48,5 1024,3
-26,0 37231,8 -1,0 9218,7 24,0 2802,3 49,0 1004,9
-25,5 36122,6 -0,5 8985,0 24,5 2741,3 49,5 986,0
xxx xxx xxx xxx xxx xxx 50,0 967,4
NTC Curve - Steinhart-Hart Equation
0,00
20000,00
40000,00
60000,00
80000,00
100000,00
120000,00
140000,00
160000,00
180000,00
200000,00
-60,00 -40,00 -20,00 0,00 20,00 40,00 60,00
temperature (degrees C)
Resistance (Ohm)
Note:
9Table values/ Graphic are referential and can modify conform the environmental temperature and
other external factors.
9The bigger the sensor ohmic Resistance is, smaller is the temperature (colder) of the Compartment.

MSEX0105i – Electronic No Frost Refrigerator Bottom Mount/ Dual Fan - Maestro High 17
5.6.2. Freezer Temperature Sensor – NTC
Located on the freezer compartment at the Evaporator Front Cover, the
Freezer temperature Sensor is responsible for internal temperature
monitoring of this compartment, sending signs to the Electronic Control
which will activate/ deactivate Compressor and Fan Motor (thermostatic
routine), keeping the internal temperature close to the desired/ selected on
the Interface Panel
Right Wrong
IMPORTANT
Check the correct position of the Freezer Sensor on its housing;
its wires should run downwards to prevent them from being broken.
It’s operation range will be in accordance to the temperature selection indicated on the Freezer Control
(LCD Panel) which will follow the list shown at the table and graphic of the Refrigerator Temperature
Sensor, since they have the same electrical properties
5.6.3. Defrost Temperature Sensor – NTC
It’s located at the freezer compartment, along with the Evaporator returning pipe. The Defrost Sensor is
responsible for sending signs to the electronic control, which will command the ending of the adaptive
defrost, turning off the Defrost Heater, containing a similar function to the well-known Defrost Bimetal.
IMPORTANT
♦The Defrost Sensor is provided with a conductor sheet that should never be removed.
♦Never change the position of such Sensors, as their functional characteristics can be modified.
This sensor also informs the temperature conditions of the Evaporator when the product is activated
(plugged in electricity) indicating to the Electronic Control the correct start up to be followed (see item –
Temperature Control), for instance, manufacturing default or the previous programming done by the
user, compressor shelter, etc.
Defrost
Sensor

MSEX0105i – Electronic No Frost Refrigerator Bottom Mount/ Dual Fan - Maestro High 18
WARNING
These Sensors (Freezer & Defrost) Are Compatible with Each Other, but
Are Not Compatible with the Sensors of the previous line.
NEVER replace these Sensors with the Sensor Kit used in the previous line.
Replacement
In the need of replacing one of the Temperature Sensors, use the
SENSOR KIT (code 326.013.997), which consist in; Temperature
Sensor (1) and connectors (2), as showed on the picture.
Field Provisions
1) Remove the defective Temperature Sensor. 2) Apart the wiring cables. Striping the wires is
not necessary
3) Now insert one of the wiring cable into the 4) Then insert one of the sensor wires into the
connector same connector
5) Using a pliers, press the connector blade. Internally, this blade will lock both wires doing the
electrical connection between them.
Wires touching the
connector bottom

MSEX0105i – Electronic No Frost Refrigerator Bottom Mount/ Dual Fan - Maestro High 19
IMPORTANT
♦Only press the metal blade after ensuring that the wires are touching the connector bottom.
♦Do not remove the silicon grease from inside the connector, for this grease protects the wire
terminals against moisture and rust.
6) Take the other connector and repeat the operation with
the other wires, then put the Sensor at its origin position.
5.7. Defrost System
This refrigerator holds an adaptive Defrost System, i.e., it’s adjustable according to needfulness,
depending on the client’s habits, environmental conditions, etc
Monitored by the Electronic Control, this system is constituted of the following components:
- Electronic Control;
- Defrost Heater;
- Defrost Temperature Sensor;
- Defrost Gutter;
- Evaporation tray (above the compressor).
The accurate frequency is defined by the Electronic Control throughout the following monitoring:
•Compressor activity time;
•Door opening frequency;
•Time of the last executed defrosts;
Defrosts shall occur in every 8 hours (of the compressor activity), able to be reduced (adaptive) to every
4 hours (of the compressor activity) according to the needfulness / usage (determined by the Electronic
Control Software).
Defrost average time is from 10 to 20 min. and the maximum is 40 min., afterwards, the product will
return to its normal operation.
Upon a period of 5 minutes elapsing after the end of the Defrost cycle, the Electronic Control will turn the
Compressor on, and as the Defrost Sensor reaches a temperature 2ºC below the one set by the Freezer
Sensor, the Fan Motors will be also activated and the unit will return to normal operation.
Summarily, the Electronic Control activates the Defrost System, which will execute the following steps:
- Fan Motors (Refrigerator & Freezer) and Compressors are turned-off;
- Heater is activated;
- Defrost Sensor informs the Defrost ending when reach 15oC (or 40 minutes, max. time);
- Heater is turned-off;
- Compressor is turned on after 5 Minutes the heater is off;
- Fan Motors are turned on when the differential of temperature between Defrost and Freezer Sensors
reach 2oC;
- Product returns to the programmed function before defrost.
This product’s Defrost System has also a safety system which will put in action an immediate
defrost in case of an existing differential temperature between Defrost Sensor and Freezer Sensor
higher than 10oC for 10 minutes, helping against casual ice building up on the Evaporator.
When the product is with Fast Freezing mode enable, the Defrost System will be fixed and not adaptive,
and 2 defrosts will occur during this period, it means, the first will occur 3 hours after the compressor
activity and the second just 9 hours after (compressor activity) the first defrost.
Upon ending the activity of the Fast Freezing function (18 hours), the next defrost cycles will occur as
adaptive normal cycles.

MSEX0105i – Electronic No Frost Refrigerator Bottom Mount/ Dual Fan - Maestro High 20
5.8. Alarm System
Should the product present any irregularity (according the possibilities below), it will set off a sound
(“BEEP”) and/ or visual Alarm (Icon blinking), through the LCD Interface, getting the diagnosis easy.
Before visiting a client requiring service, we must request to the consumer if any Alarm or failure Code is
been shown on the LCD display (Interface Board)
ATTENTION
When one of these faults occur, the client must be instructed to turn off the sound alarm by pressing the
OK key, however, THE PRODUCT MUST NOT BE UNPLUGGED FROM THE WALL SOCKET.
The Alarms can be:
5.8.1. Caution Alarm
a) Party Mode Alarm (exceeded time)
After exceeded 30 minutes of predetermined time to the Party
Mode, product will raise the Caution Alarm (Caution Alarm Icon
will light and the Party Icon will flash), indicating the bottle can be
taken. Its operational properties will not be changed.
To disable the Alarm, press OK key
When Constant, there is the chance of a real Sensor Failure, being necessary to check its source
Check Point:
- Poor contact between terminals/ connectors – CN4 / Electronic Control (main board), Interface board
(LCD Display), upper wiring harness between freezer Door and Cabinet;
- Open wires/ wiring harness
- Finally, Interface board or Electronic Control (main board). Do the Interface Board – LCD Display
routine.
b) Anti Bacteria Filter Alarm (replacement time)
This product has a function that announce the correct time of Filter
replacement which will occur after 4320 hours of plugged in
product, it means, around 6 months of Filter life. At this moment, a
Caution Alarm will blink and Failure Code – “AF” will be shown in
the LCD Display.
To disable the Alarm, just press OK key, therefore the Caution Icon
will remain in the LCD and every 6 hours the sound alarm with “AF”
code will activate again, until consumer replace the Filter and reset
the counter.
To reset the counter, keep OK key pressed for 5 seconds while the product is in Alarm mode (this reset
can not be done with the product out of “AF” Alarm) and the Caution Alarm Icon together with the “AF” failure
code will disappear.
IMPORTANT
Don’t reset the Alarm counter before Filter replacement.
It will prejudice the Anti-Bacteria Filter Alarm function
When constant, there is the chance of a real Technical Failure, check its source.
Check Point:
- Poor contact between terminals/ connectors – CN4 / Electronic Control (main board), Interface board
(LCD Display), upper wiring harness between freezer Door and Cabinet;
- Open wires/ wiring harness
- Finally, Interface board or Electronic Control (main board). Do the Interface Board – LCD Display
routine.