Internal Use Only
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Multi Air Conditioner
SVC MANUAL(General)
MODEL : Multi-Inverter Type
CAUTION
Before Servicing the unit, read the safety precautions in General SVC manual.
Only for authorized service personnel.
Air Conditioner Service Manual
CONTENTS
Part 1 General Information.........................................................................................................2
1. Safety Precautions........................................................................................................3
2. Model Line Up................................................................................................................6
3. Nomenclature ................................................................................................................7
Part 2 Functions & Controls ......................................................................................................8
1. List of Functions & Controls........................................................................................9
2. Air Flow .......................................................................................................................12
3. Air Purifying.................................................................................................................14
4. Installation Functions .................................................................................................15
5. Reliability .....................................................................................................................18
6. Convenience Functions & Controls .........................................................................19
Part 3 Control logic....................................................................................................................24
1. Compressor .................................................................................................................25
2. Step(frequency) control..............................................................................................26
3. Reversing valve operaton ..........................................................................................27
4. Discharge pipe control ...............................................................................................28
5. Input Current Control..................................................................................................29
6. Outdoor Fan Control...................................................................................................30
7. Defrost Control............................................................................................................31
8. LEV Control .................................................................................................................32
9. Oil restoration operation ............................................................................................34
10. Compressor warm-up control logic ........................................................................34
11. Heat sink control .......................................................................................................35
Part 4 Test Run ..........................................................................................................................36
1. Check before Test Run ..............................................................................................37
2. Test Run Flow chart ...................................................................................................38
3. Test Runing..................................................................................................................39
Part 5 Trouble Shooting Guide ...............................................................................................40
1. Self-diagnosis Function ......................................................................................41
2. Pump Down ..........................................................................................................43
3. Evacuation............................................................................................................44
4. Gas Charging .......................................................................................................45
5. Cycle Part .............................................................................................................46
6. Electronic Parts....................................................................................................47
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LGE Internal Use Only
Part 1 General Information
1. Safety Precautions ............................................................................................................3
2. Model Line Up .....................................................................................................................6
3. Nomenclature......................................................................................................................7
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LGE Internal Use Only
Part 1 General Information
1. Safety Precautions
To prevent injury to the user or other people and property damage, the following instructions must be followed.
■ Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is classified by the following indications.
This symbol indicates the possibility of death or serious injury.
This symbol indicates the possibility of injury or damage to properties only.
■ Meanings of symbols used in this manual are as shown below.
Be sure not to do.
Be sure to follow the instruction.
Dangerous Voltage
1.1 Cautions in Repair
Be sure to disconnect the power cable plug from the plug socket before disassembling the equipment for a repair.Internal components and circuit boards are at
main potential when the equipment is connected to the power cables. This voltage is extremely dangerous and may cause death or severe injury if come in contact with it.
Do not touch the discharging refrigerant gas during the repair work.
The discharging refrigerant gas.The refrigerant gas can cause frostbite.
Release the refrigerant gas completely at a well-ventilated place first.
Otherwise, when the pipe is disconnected, refrigerant gas or refrigerating
machine oil discharges and it Can cause injury.
When the refrigerant gas leaks during work, execute ventilation. If the refrigerant
gas touches to a fire, poisonous gas generates. A case of leakage of the refrigerant and the closed room full with gas is dangerous because a shortage of oxygen
occurs. Be sure to execute ventilation.
When removing the front panel or cabinet, execute short-circuit and discharge
between high voltage capacitor terminals. If discharge is not executed, an electric
shock is caused by high voltage resulted in a death or injury.
Do not turn the air-conditioner ON or OFF by plugging or unplugging the power
plug. There is risk of fire or electrical shock.
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LGE Internal Use Only
Part 1 General Information
Do not use a defective or underrated circuit breaker. Use the correctly rated
breaker and fuse. Otherwise there is a risk of fire or electric shock.
Install the panel and the cover of control box securely. Otherwise there is risk of
fire or electric shock due to dust, water etc.
Indoor/outdoor wiring connections must be secured tightly and the cable should
be routed properly so that there is no force pulling the cable from the connection
terminals. Improper or loose connections can cause heat generation or fire.
Do not touch, operate, or repaire the product with wet hands. Hoding the plug by
hand when taking out. Otherwise there is risk of electric shock or fire.
Do not turn on the breaker under condition that front panel and cabinet are
removed.
Be sure to earth the air conditioner with an earthing conductor connected to the
earthing terminal.
Conduct repair works after checking that the refrigerating cycle section has
cooled down sufficiently. Otherwise, working on the unit, the hot refrigerating
cycle section can cause burns.
Do not tilt the unit when removing panels. Otherwise, the water inside the unit
can spill and wet floor.
Do not use the welder in a well-ventilated place. Using the welder in an enclosed
room can cause oxygen deficiency.
Be sure to turn off power switch before connect or disconnect connector, or parts
damage may be occurred.
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Part 1 General Information
1.2 Inspections after Repair
Check to see if the power cable plug is not dirty or loose. If the plug is dust or
loose it can cause an electrical shock or fire.
Do not use a joined power cable or extension cable, or share the same power
outlet with other electrical appliances. otherwise, it can cause an electrical shock,
excessive heat generation or fire.
Do not insert hands or other objects through the air inlet or outlet while the product is operating. There are sharp and moving parts that could cause personal
injury.
Do not block the inlet or outlet of air flow. It may cause product failure
Check to see if the parts are mounted correctly and wires are connected.
Improper installation and connections can cause an electric shock or an injury.
Check the installation platform or frame has corroded. Corroded installation platform or frame can cause the unit to fall, resulting in injury.
Be sure to check the earth wire is correctly connected.
After the work has finished, be sure to do an insulation tset to check the resistance is 2[Mohm] or more between the charge section and the non-charge metal
section (Earth position). If the resistance value is low, a disaster such as a leak or
electric shock is caused at userʼs side.
Check the drainage of the indoor unit after the repair. If drainage is faulty the
water to enter the room and wet floor.
Copyright ©2010 LG Electronics. Inc. All right reserved.
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LGE Internal Use Only
Part 1 General Information
2. Model Line Up
2.1 Indoor units
Category
Type
Chassis
2.64
(9)
SB
Wall
mounted
Model names
Capacity, kW(kBtu/h Class)
3.52
(12)
AMNW09GDBL0
[LMAN096HV]
5.28
(18)
AMNW12GDBL0
[LMAN126HV]
LIBERO
AMNW18GDCL0
[LMAN186HV]
SC
SE
AMNW09GDER1
[LMAN095HVT]
AMNW12GDER1
[LMAN125HVT]
ART COOL
AMNW18GD8R1
[LMAN185HVT]
S8
AMNW12GTRA0
[LMCN125HV]
TR
Ceiling cassette
AMNW18GTQA0
[LMCN185HV]
TQ
Ceiling
concealed
duct
B1
Low
static
pressure
(Slim)
AMNW09GB1A0
[LMDN095HV]
AMNW12GB1A0
[LMDN125HV]
AMNW18GB2A0
[LMDN185HV]
B2
2.2 Outdoor units
Heat pump
No. of connectable indoor units
Total capacity index of connectable
indoor units
Power supply
A2UW183FA2
[LMU187HV]
A3UW243FA2
[LMU247HV]
A4UW363FA1
[LMU366HV]
A4UW363FA2
[LMU369HV]
Max.2
Max.3
Max.4
Max.4
24
33
48
48
1Ø, 208~230V, 60Hz
Chassis
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LGE Internal Use Only
Part 1 General Information
3. Nomenclature
3.1 Indoor Unit(Global)
AMN
W
09
G
D
E
L
0
Serial number
Function
A : Basic, L : Nano plasma (Wall Mounted)
C: Plasma(ceiling cassette), G: Low static motor
ART COOL(Mirror) type front panel color
R : Mirror, W : White, G : Gold
Chassis name
Indoor unit type
L : Wall Mounted,
D : ART COOL Mirror
T : Ceiling cassette, B : Ceiling concealed duct
Electrical rating
G: 1ø, 208-230V, 50Hz/60Hz
Cooling/heating capacity
Ex) 7,000 Btu/h Class → '07', 18,000 Btu/h Class → '18'
Model type
H : Heat pump
W : DC Inverter heat pump
Indicates that this is multi system indoor unit using R410A
3.2 Outdoor Unit(Global)
A2U
W
18
3
F
A
0
Serial number
Function
A : Basic
Multi type
F : Free joint multi type
Electrical rating
3 : 1ø, 208-230V, 60Hz
Cooling/heating capacity
Ex) 24,000 Btu/h Class → '24', 36,000 Btu/h Class → '36'
Model type
W : DC inverter heat pump
Indicates that this is multi system outdoor unit using R410A
Ex) A2U : Connectable max. 2 indoor units
A4U : Connectable max. 4 indoor units
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LGE Internal Use Only
Part 2 Functions & Controls
1. List of Functions & Controls ..........................................................................................9
2. Air flow ............................................................................................................................12
2.1 Auto swing (left & right) ...............................................................................................12
2.2 Auto swing (up & down) ..............................................................................................12
2.3 Chaos swing (up/down)...............................................................................................12
2.4 Air flow step.................................................................................................................13
2.5 Chaos wind (auto wind)...............................................................................................13
2.6 Jet Cool Mode Operation ............................................................................................13
2.7 Swirl wind Swing .........................................................................................................13
3. Air purifying ....................................................................................................................14
3.1 PLASMA Air Purifying System ....................................................................................14
4. Installation Functions ....................................................................................................15
4.1 E.S.P. (External Static Pressure) Setting ....................................................................15
4.2 How to Set E.S.P? ......................................................................................................16
4.3 High Ceiling operation.................................................................................................17
5. Reliability ........................................................................................................................18
5.1 Hot start.......................................................................................................................18
5.2 Self-diagnosis Function...............................................................................................18
5.3 Soft dry operation........................................................................................................18
6. Convenience Functions & Controls .............................................................................19
6.1 Auto cleaning operation ..............................................................................................19
6.2 Auto Operation (Fuzzy Operation) ..............................................................................20
6.3 Auto restart Opeartion.................................................................................................21
6.4 Child Lock Function.....................................................................................................22
6.5 Forced operation .........................................................................................................22
6.6 Sleep Timer Operation ................................................................................................23
6.7 Timer(On/Off) ..............................................................................................................23
6.8 Defrost Control (Heating) ............................................................................................23
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Part 2 Functions & Controls
1. List of Functions & Controls
1.1 Description of Functions/Controls
Category
Airflow
Air purifying
Installation
Reliability
Function
Auto swing (left & right)
Auto swing (up & down)
Chaos swing (up & down)
Airflow steps (fan/cool/heat)
Chaos wind (auto wind)
Jet cool (Power wind)
Swirl wind Swing
Deodorizing filter
Plasma air purifier
Pre-filter
(washable/anti-fungus)
Drain pump
E.S.P. control
Electric heater (operation)
High ceiling operation
Hot start
Self diagnosis
Soft dry operation
Auto changeover
Auto clean
Auto operation
(artificial intelligence)
Auto restart operation
Convenience
Child lock
Forced operation
Group control
Sleep mode
Timer (on/off)
Timer (weekly)
Two thermistor control
Standard wired remote
controller
Deluxe wired remote controller
Simple wired remote controller
Individual control Wired remote Controller
(for hotel use)
Wireless remote controller
(simple)
Wireless LCD remote control
General central controller
CAC network
(Non LGAP)
function
Dry contact
Description
Remark
Horizontal Airflow Direction control
Vertical Airflow Direction control
Vertical Airflow Direction control
Indoor Fan speed Control
Indoor Fan speed Control by chaos pattern
Powerful cooling mode
Distribute & stir the Air inside.
Air filtration using Deodorizing filter
Air filtration using plasma filter
Air filtration using pre-filter
Optional
Optional
Optional
Drain water pump
Changeable External Static Pressure
Electric heater
Function to Control the Air Volume by Ceiling Height
To prevent cold wind blow on heating mode start
Error code displays
Dehumidification
Cooling mode is automatically changed to heating mode and
vice verse
After cooling operation, this function makes the
evaporator dry
Air volume & set temp. are automatically selected for comfort
on Cooling/Heating mode
When power returns after a power failure, unit restarts in the
previous operating mode
Protect the unit operation without approval
Operation without remote controller
Where several products are linked, one specific control
device can control a specific number of products.
Air volume & set temp. are automatically changed for comfortable sleep
Operation by Timer setting
Operation by weekly reservation
Option to control temperature by referring thermistor in the
Indoor unit or the LCD wired remote.
Standard wired remote controller
Optional
Optional
Optional
Optional
Deluxe wired remote controller
Simple wired remote controller
Wired remote controller (for hotel use)
Optional
Optional
Wireless remote controller (simple)
Optional
Wireless LCD remote control
General central controller
Optional
Dry contact
Optional
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Optional
Optional
Optional
Optional
Optional
Optional
Optional
Optional
Optional
Optional
Optional
Optional
LGE Internal Use Only
Part 2 Functions & Controls
Category
CAC network
function
Function
Network Solution (LGAP)
PDI
(Power Distribution Indicator)
PI 485
Zone control
Special function
Low ambient operation
& kit
Space Control
Auto Elevation
Defrost / Deicing
High pressure switch
Low pressure switch
Functions for Phase protection
Restart delay
outdoor
(3-minutes)
Self diagnosis
Soft start
Test function
Description
Remark
Network Solution (LGAP)
PDI (power distribution indicator)
Optional
Network control using PI 485 (Internet)
control the operation of the Air conditioning unit where each
zone
For operation at low temp.
Vanes angle can be controlled by pair.
Grille is automatically down to clean
Condenser frost prevention
Detect high pressure for safety
Detect low pressure for safety
Misconnection prevention for three phase
For overload prevention
Optional
Error code displays
Soft start for compressor
Test operation
Optional
Optional
Optional
Optional
Optional
Optional
Optional
Optional
Optional
Notes: The Exploded View part has the particular Function table for each model.
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Part 2 Functions & Controls
1.2 List of functions
Category
Function
Air supply outlet
Airflow direction control(left & right)
Airflow direction control(up & down)
Auto swing(left & right)
Auto swing(up & down)
Air flow
Airflow steps(fan/cool/heat)
Chaos swing
Chaos wind(auto wind)
Jet cool/heat(Power wind)
Swirl wind
Deodorizing filter
Allergy free filter
Air purifying
Plasma air purifier
Prefilter(washable / anti-fungus)
Drain pump
E.S.P. control
Installation
Electric heater(operation)
High ceiling operation
Hot start
Reliability Self diagnosis
Soft dry operation
Auto changeover
Auto cleaning
Auto operation(artificial intelligence)
Auto restart operation
Child lock
Energy-Saving Cooling Mode
Convenience Forced operation
Group control
Sleep mode
Timer(on/off)
Timer(weekly)
Two thermistor control
Wide wired remote controller
Deluxe wired remote controller
Simple wired remote controller
Simple wired remote controller(for hotel use)
Individual
control
Wireless remote controller(simple)
Wireless LCD remote control
Wireless LCD remote control(Ez)
General central controller (Non LGAP)
Dry contact
CAC network Dry contact(temperature setting)
function
Central control(LGAP)
PDI(power distribution indicator)
PI 485
CTIE
Special
function kit Zone control
Others
Thermistor
Wall Mounted
(LIBERO)
ART COOL
Mirror
1
Auto
Auto
O
O
5/6/6
X
O
O/O
X
O
O
O
O
O
O
O
X
O
O
O
O
O
O
O
O
O
O
Accessory
X
Accessory
Accessory
X
X
O
X
Accessory
Accessory
O
Accessory
Accessory
X
X
-
1
Auto
Auto
O
×
3/4/3
O
X
O/X
X
O
X
O
O
O
O
O
X
O
O
O
X
O
O
O
Accessory
X
Accessory
Accessory
X
X
O
X
Accessory
Accessory
O
Accessory
Accessory
X
X
-
Ceiling
Ceiling Cassette
Concealed Duct
4-way
(Low static)
4
1
X
Auto
X
O
4/5/4
3/3/3
X
O
X
O/X
O/X
O
X
X
X
X
X
Option
X
O
O
O
O
O
X
X
O
O
O
O
O
O
O
X
X
X
X
O
O
O
O
O
O
X
X
O
X
O
O
O
X
O
X
O
X
O
O
Accessory
Accessory
X
X
Accessory
O
Accessory
Accessory
X
X
X
X
O
Accessory
X
X
Accessory
Accessory
Accessory
Accessory
O
O
Accessory
Accessory
Accessory
Accessory
X
X
-
* Some of functions are slightly different depending upon models, refer individual function table on "PART 2. indoor units".
** For ceiling concealed duct models, auto-run function of dry contact is not applicable.
O : Applied
X : Not applied – : No relation
Option : Model name & price are different according to options, and assembled in factory with main unit.
Accessory : Installed at field, ordered and purchased separately by the corresponding model name, supplied with separate package.
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LGE Internal Use Only
Part 2 Functions & Controls
2. Air flow
2.1 Auto swing (left & right)
• By the horizontal airflow direction control key input, the left/right louver automatically operates with the auto swing or it
is fixed to the desired direction.
Left
Right
110° ~ 120°
2.2 Auto swing (up & down)
• By the auto swing key input, the upper/lower vane automatically operates with the auto swing or it is fixed to the
desired direction.
Close
110° ~ 120°
Open
2.3 Chaos swing (up/down)
• By the Chaos swing key input, the upper/lower vane automatically operates with the chaos swing or it is fixed to the
desired direction.
CLOSED
110~120°
Mode9
Mode8
Mode7
Mode6
Mode5
Mode4
Mode3
7~8°
Mode2
OPEN
NOTE: Some Models are different by swing width and swing pattern.
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Part 2 Functions & Controls
2.4 Air flow step
• Indoor fan motor control have 6 steps.
• Air volume is controlled "SH", "H", "Med", Low" by remote controller.
• "LL" step is selected automatically in Hot start operation.
Step
Discription
LL
L
M
H
SH
Auto
Very low, In heating mode
Low
Med
High
Super high
Chaos wind
2.5 Chaos wind (auto wind)
• When "Auto" step selected and then operated, the high, medium, or low speed of the airflow mode is operated for
2~15 sec. randomly by the Chaos Simulation
2.6 Jet Cool Mode Operation
• While in heating mode or Fuzzy operation, the Jet Cool key cannot be input.
When it is input while in the other mode operation (cooling, dehumidification, ventilation), the Jet Cool mode is operated.
• In the Jet Cool mode, the indoor fan is operated at super-high speed for 30 min. at cooling mode operation.
• In the Jet Cool mode operation, the room temperature is controlled to the setting temperature, 18°C.
• When the sleep timer mode is input while in the Jet Cool mode operation, the Jet Cool mode has the priority.
• When the Jet Cool key is input, the upper/lower vanes are reset to those of the initial cooling mode and then operated
in order that the air outflow could reach further.
2.7 Swirl wind Swing
Vane 2
• It is the function for comfort cooling/heating operation.
• The diagonal two louvers are opened the more larger
than the other louvers. After one minute, it is opposite.
Vane 1
Vane 4
• Comparison of Air Flow Types
4-Open (conventional)
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Vane 3
Swirl Swing (New)
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Part 2 Functions & Controls
3. Air purifying
3.1 PLASMA Air Purifying System
The PLASMA Air Purifying System not only removes microscopic contaminants and dust, but also removes house
mites, pollen, and pet fur to help prevent allergic diseases like asthma. This filter that can be used over and over again
by simply washing with water.
Dust electrode discharge
Dust particles
Photo-Catalyst Coated Mesh
Ionizer
+4.8KV discharge +
+
Polluted Air
+
Purified fresh Air
+
+
Generating plasma
Odour
Odour molecule
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LGE Internal Use Only
Part 2 Functions & Controls
4. Installation Functions
4.1 External pressure setting for
(E.S.P. Control) provide required constant air flow rate irrespective of E.S.P. charge.
(1) Open the rear cover of the wired remote-controller to set the mode.
(2) Select one of three selectable modes as follows.
Group control switch
1. For individual control/Master use
2. For group control/Slave use
Group Control
Ceiling height selection switch
SW±GR
2
1
1. Position V-L:
• Minimum E.S.P. setting & Fan speed is varied according
to the state of dampers by micom.
Ceiling Height/Default E.S.P
2. Position F-H:
• Maximum E.S.P. setting & Fan speed doesn't vary
according to the opening & closing of dampers.
3. Position V-H:
• Maximum E.S.P. setting & Fan speed is varied according
to the state of dampers by micom.
3
2
1
S/W 1
Select Product
Product selection switch
1. Cooling Only product
SW±HI
SW±PD
2
1
2. Heat Pump product
Indoor temperature sensor selection switch
Room Temp. Sensing
1. Use the temperature sensor on the remote controller.
SW±TH
3 2 1
2. Use the temperature sensor on the product.
3. Use the sensors on the product and remote controller.
• When changing the product selection switch and group control switch, the power must be reconnected to reflect the changes.
• The central control could operate inappropriately depends on indoor unit type, when the remote controller is set as slave.
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LGE Internal Use Only
Part 2 Functions & Controls
4.2 How to Set E.S.P?
This Function can be controled with new wired remote controller
Procedure of RPM change:
Ex) External static pressure is 29Pa for model name "AMNW12GB1A0[LMDN125HV]".
• To protect the unit, compressor is designed to be off during E.S.P. setting.
• E.S.P function is setting the volume of each fan speed.
It is for the convenience of installation.
It is recommended that you should not use this function while using the remote controller.
PQRCUCS0C
Defrost
Preheat Out door
Room Temp
1
Press the mode button and the temperature increasing
button(▲) same time for three seconds.
2
Set the volume of each fan speed(Low, Medium, Hi)
by using the temperature control button. Press the fan
speed button to select the fan speed.
The value of E.S.P can be adjusted from 1 to 255.
3
If you press the On/Off button while setting the ESP
function, it will be canceled. (The picture on the left
side is the example of setting the Hi wind to ESP 09.)
4
Press the mode button and the temperature increasing
button (s) same time for three seconds. Then the ESP
setting will be activated after the temperature display
flashes three times.
Total on
Central Run
TEMP
MODE
FAN
SPEED
TEMP
Lo
Med
100
Setting the Low wind to 210
Setting the Medium wind to 175
❈ The E.S.P value is set at the proper value at the factory.
So it is highly recommended that you should not change
the E.S.P value at your discretion.
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Part 2 Functions & Controls
E.S.P. setting value (reference)
Static pressure(mmAq)
Model name
0
1
Step(Hi/Mid/Lo)
2
3
4
Setting value
8.5 CMM(300CFM)
75
84
94
104
114
7.5 CMM(265CFM)
69
77
88
99
110
6.5 CMM(230CFM)
62
71
83
95
106
9.5 CMM(335CFM)
82
90
99
109
118
8.5 CMM(300CFM)
75
84
94
104
114
7.5 CMM(265CFM)
69
77
88
99
110
15 CMM(530CFM)
AMNW18GB2A0
13.5 CMM(477CFM)
[LMDN185HV]
11.5 CMM(406CFM)
90
97
105
114
122
82
90
99
109
119
75
84
93
103
114
AMNW09GB1A0
[LMDN095HV]
AMNW12GB1A0
[LMDN125HV]
[ Notes ]
1. To get the desired Airflow & E.S.P. combination from the table set the matching value from the table. Value other than
that in table will not give the combinations of airflow & E.S.P. which are mentioned in the table.
2. Table data is based at 230V. According to the fluctuation of voltage, air flow rate varies.
4.3 High Ceiling operation
Function to Control the Air Volume by Ceiling Height Control of the air intensity has been made possible by employing a
height-control algorithm for the interior fan.
According to the height of the installation, it provides variability of indoor fan motor rpm. If the height of installation is low
then you can adjust low rpm of indoor fan motor. On the other hand if the height of the installation is high you can adjust
high rpm of indoor fan motor. Selection of speed can be done by slide switch at the back of the LCD wired remote.
installation on the
higher ceiling
Installation on the
normal-height ceiling
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Part 2 Functions & Controls
5. Reliability
5.1 Hot start
• When heating is started, the indoor fan is stopped or very slow to prevent the cold air carry out
• When the temp. of heat exchanger reach 30°C(model by model), indoor fan is started.
5.2 Self-diagnosis Function
• The air conditioner installed can self-diagnosed its error status and then transmits the result to the central control.
Therefore, a rapid countermeasure against failure of the air conditioner allows easy management and increases the
usage life of air conditioner.
• Refer to trouble shooting guide.
5.3 Soft dry operation
• When the dehumidification operation input by the remote control is received, the intake air temperature is detected and
the setting temp is automatically set according to the intake air temperature.
Intake air Temp.
78°F(26°C) ≤ intake air temp.
76°F(24°C) ≤ intake air temp.< 78°F(26°C)
72°F(22°C) ≤ intake air temp. < 76°F(24°C)
64°F(18°C) ≤ intake air temp. < 72°F(22°C)
intake air temp. < 64°F(18°C)
Setting Temp.
77°F(25°C)
intake air temp. -2°F(-1°C)
intake air temp. 1°F(-0.5°C)
intake air temp.
64°F(18°C)
• While compressor off, the indoor fan repeats low airflow speed and stop.
• While the intake air temp is between compressor on temp. and compressor off temp., 10-min dehumidification operation and 4-min compressor off repeat.
Compressor ON Temp. ➔ Setting Temp+1°F(0.5°C)
Compressor OFF Temp. ➔ Setting Temp-1°F(0.5°C)
• In 10-min dehumidification operation, the indoor fan operates with the low airflow speed.
Copyright ©2010 LG Electronics. Inc. All right reserved.
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LGE Internal Use Only
Part 2 Functions & Controls
6. Convenience Functions & Controls
6.1 Auto cleaning operation
• Function used to perform Self Cleaning to prevent the Unit from Fungus and bad odor.
• Used after the Cooling Operation before turning the unit off, clean the Evaporator and keep it dry for the next operation.
• The function is easy to operate as it is accessed through the Remote controller.
Unit
Operation
(Heat Pump)
ON
OFF
ON
Indoor
Fan
OFF
Setting step
OFF
L Low
ON
Comp.
OFF
Setting step
Unit
Operation
13~14 minutes
1 minute
2~3 minutes
(Cooling Only)
ON
OFF
ON
Indoor
Fan
OFF
Setting step
L Low
OFF
ON
Comp.
OFF
Setting step
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LGE Internal Use Only
Part 2 Functions & Controls
6.2 Auto Operation (Fuzzy Operation)
• When any of operation mode is not selected like the moment of the power on or when 3 hrs has passed since the
operation off, the operation mode is selected.
• When determining the operation mode, the compressor, the outdoor fan, and the 4 way valve are off and only the
indoor fan is operated for 15 seconds. Then an operation mode is selected according to the intake air temp at that
moment as follows.
76°F(24~25°C) ≤ Inatake Air Temp
➔ Fuzzy Operation for Cooling
70°F(21°C) ≤ Inatake Air Temp < 76°F(24~25°C) ➔ Fuzzy Operation for Dehumidification
Inatake Air Temp < 70°F(21°C)
➔ Fuzzy Operation for Heating
• If any of the operation modes among cooling / dehumidification / heating mode operations is carried out for 10 sec or
longer before Fuzzy operation, the mode before Fuzzy operation is operated.
6.2.1 Fuzzy Operation for Cooling
• According to the setting temperature selected by Fuzzy rule, when the intake air temp is 0.5°C or more below the setting temp, the compressor is turned off. When 0.5°C or more above the setting temp, the compressor is turned on.
Compressor ON Temp ➔ Setting Temp + 1°F(0.5°C)
Compressor OFF Temp ➔ Setting Temp + 1°F(0.5°C)
• At the beginning of Fuzzy mode operation, the setting temperature is automatically selected according to the intake air
temp at that time.
78°F(26°C) ≤ Intake Air Temp
➔ 76°F(24~25°C)
76°F(24~25°C)≤ Intake Air Temp<78°F(26°C)
➔ Intake Air Temp + 2°F(1°C)
72°F(22°C)≤ Intake Air Temp<76°F(24~25°C)
➔ Intake Air Temp + 1°F(0.5°C)
64°F(18°C)≤ Intake Air Temp<72°F(22°C)
➔ Intake Air Temp
Intake Air Temp<64°F(18°C)
➔ 64°F(18°C)
• When the Fuzzy key (Temperature Control key) is input after the initial setting temperature is selected, the Fuzzy key
value and the intake air temperature at that time are compared to select the setting temperature automatically according to the Fuzzy rule.
• While in Fuzzy operation, the airflow speed of the indoor fan is automatically selected according to the temperature.
6.2.2 Fuzzy Operation for Dehumidification
• According to the setting temperature selected by Fuzzy rule, when the intake air temp is 1°F(0.5°C) or more below the setting temp, the compressor is turned off. When 1°F(0.5°C) or more above the setting temp, the compressor is turned on.
Compressor ON Temp ➔ Setting Temp + 1°F(0.5°C)
Compressor OFF Temp ➔ Setting Temp+1°F(0.5°C)
• At the beginning of Fuzzy mode operation, the setting temperature is automatically selected according to the intake air
temp at that time.
78°F(26°C) ≤ Intake Air Temp
➔ 76°F(24~25°C)
76°(24~25°C) ≤ Intake Air Temp<78°F(26°C)
➔ Intake Air Temp+2°F(1°C)
72°F(22°C) ≤ Intake Air Temp<76°F(24~25°C)
➔ Intake Air Temp+1°F(0.5°C)
64°F(18°C) ≤ Intake Air Temp<72°F(22°C)
➔ Intake Air Temp
Intake Air Temp<64°F(18°C)
➔ 64°F(18°C)
• When the Fuzzy key (Temperature Control key) is input after the initial setting temperature is selected, the Fuzzy key
value and the intake air temperature at that time are compared to select the setting temperature automatically according to the Fuzzy rule.
• While in Fuzzy operation, the airflow speed of the indoor fan repeats the low airflow speed or pause as in dehumidification operation.
Copyright ©2010 LG Electronics. Inc. All right reserved.
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LGE Internal Use Only
Part 2 Functions & Controls
6.2.3 Fuzzy Operation for Heating
• According to the setting temperature selected by Fuzzy rule, when the intake air temp is 3.5°F(3°C) or more above the
setting temp, the compressor is turned off. When below the setting temp, the compressor is turned on.
Compressor ON Temp ➔ Setting Temp
Compressor OFF Temp ➔ Setting Temp + 3.5°F(3°C)
• At the beginning of Fuzzy mode operation, the setting temperature is automatically selected according to the intake air
temp at that time.
68°F(20°C)≤Intake Air Temp
➔ Intake Air Temp + 1°F(0.5°C)
Intake Air Temp<68°F(20°C)
➔ 68°F(20°C)
• When the Fuzzy key (Temperature Control key) is input after the initial setting temperature is selected, the Fuzzy key
value and the intake air temperature at that time are compared to select the setting temperature automatically according to the Fuzzy rule.
• While in Fuzzy operation, the airflow speed of the indoor fan is set to the high or the medium according to the intake air
temperature and the setting temperature.
Notes: The Temp. of Comp. Turn ON and OFF is different in heating mode and fuzzy operation for heating. Please,
refer page 11
6.3 Auto restart Operation
• Whenever there is electricity failure to the unit, and after resumption of the power, unit will start in the same mode prior
to the power failure. Memorized condition are on / off condition, operating mode (cooling/ heating), set temperature and
fan speed. The unit will memorize the above conditions and start with same memorized condition.
Copyright ©2010 LG Electronics. Inc. All right reserved.
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LGE Internal Use Only
Part 2 Functions & Controls
6.4 Child Lock Function
This is a function to prevent tampering of settings by children or others.
can use the child lock function by pressing both tempera1 You
ture increasing button and fan speed button for three seconds.
In the initial setting of the child lock function, "CL" will be displayed on the display panel and then it will come back to the
original mode. Now a click of another button will not be recognized and the "CL" is being shown on the display panel for
three seconds due to child lock.
PQRCUCA0
Defrost
Preheat Out door
Room Temp
Total on
Central Run
want to cancel the child lock mode, press the tempera2 Iftureyouincreasing
button and the fan speed button again for three
MODE
seconds.
FAN
SPEED
6.5 Forced operation
• To operate the appliance by force in case when the remote control is lost, the forced operation selection switch is on
the main unit of the appliance, and operate the appliance in the standard conditions.
• The operating condition is set according to the outdoor temp. and intake air temperature as follows.
Indoor temp.
Operating Mode
Setting temp.
over 76°F(24~25°C)
Cooling
72°F(22°C)
70~76°F(21~24°C)
Healthy Dehumidification
72°F(22°C)
below 70°F(21°C)
Heating
72°F(22°C)
Setting speed of
indoor fan
High speed
• The unit select the last operation mode in 3 hours.
• Operating procedures when the remote control can't be used is as follows :
- The operation will be started if the ON/OFF button is pressed.
- If you want to stop operation, re-press the button.
Copyright ©2010 LG Electronics. Inc. All right reserved.
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LGE Internal Use Only
Part 2 Functions & Controls
6.6 Sleep Timer Operation
• When the sleep time is reached after <1,2,3,4,5,6,7,0(cancel) hr> is input by the remote control while in appliance
operation, the operation of the appliance stops.
• While the appliance is on pause, the sleep timer mode cannot be input.
• While in cooling mode operation, 30 min later since the start of the sleep timer, the setting temperature increases by
1°C. After another 30 min elapse, it increases by 1°C again.
• When the sleep timer mode is input while in cooling cycle mode, the airflow speed of the indoor fan is set to the low.
• When the sleep timer mode is input while in heating cycle mode, the airflow speed of the indoor fan is set to the medium.
6.7 Timer(On/Off)
6.7.1 On-Timer Operation
• When the set time is reached after the time is input by the remote control, the appliance starts to operate.
• The timer LED is on when the on-timer is input. It is off when the time set by the timer is reached.
• If the appliance is operating at the time set by the timer, the operation continues.
While in Fuzzy operation, the airflow speed of the indoor fan is automatically selected according to the temperature.
6.7.2 Off-Timer Operation
• When the set time is reached after the time is input by the remote control, the appliance stops operating.
• The timer LED is on when the off-timer is input. It is off when the time set by the timer is reached.
• If the appliance is on pause at the time set by the timer, the pause continues.
6.8 Defrost Control (Heating)
• Defrost operation is controlled by timer and sensing temperature of outdoor pipe.
• The first defrost starts only when the outdoor pipe temperature falls below -6°C after starting of heating operation and
more than 4 minutes operation of compressor.
• Defrost ends after 12 minutes passed from starting of defrost operation when the outdoor rises over 15°C even before
12 minutes.
• The second defrost starts only when the outdoor pipe temperature falls below – 6°C after from ending of the first
defrost and more than 4 minutes operation of compressor.
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LGE Internal Use Only
3. Control logic
1. Compressor ......................................................................................................................25
2. Step(frequency) control ...................................................................................................26
3. Reversing valve operaton................................................................................................27
4. Discharge pipe control.....................................................................................................28
5. Input Current Control .......................................................................................................29
6. Outdoor Fan Control ........................................................................................................30
7. Defrost Control .................................................................................................................31
8. LEV Control.......................................................................................................................32
9. Oil restoration operation..................................................................................................34
10. Compressor warm-up control logic..............................................................................34
11. Heat sink control.............................................................................................................35
Copyright ©2010 LG Electronics. Inc. All right reserved.
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LGE Internal Use Only
Part 3 Control logic
1. Compressor
Basic principle is to control the rpm of the motor by changing the working frequency of the compressor.
Three phase voltage is supplied to the motor and the time for which the voltage will supplied is controlled by IPM
(intelligent power module).
Switching speed of IPM defines the variable frequency input to the motor.
RPM → Revolutions/Minute
F
→ Frequency
P
→ Number of poles
RPM = 120 f
P
BLDC Motor
IPM (Inverter)
EMF
UVWXYZ
MCU
(16Bits)
Copyright ©2010 LG Electronics. Inc. All right reserved.
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U
V
W
Position
Detect
Circuit
- 25 -
LGE Internal Use Only
Part 3 Control logic
2. Step(frequency) control
2.1 Frequency control
Frequency that corresponds to each rooms capacity will be determined according to the difference in the temperature of
each room and the temperature set by the remote controller.
There are various factors determining the frequency.
1. Indoor unit capacity value.
2. Temperature compensation factor
3. Initial frequency setting
To & fro
feedback
Indoor temperature
Indoor capacity
Indoor On/OFF
Selected fan speed
System
ON/Setting
Indoor
data
Outdoor
Temperature
Outdoor
data
Basic formula of
calculation
Compressor setting
Calculation of
set frequency
Start
system
Continues
check
Stop
system
System
error
2.2 Primary step setting
: Capacity steps of compressor are decided by ∑Qj (Summation of capacity code), TA0(Outdoor temp.), TAI(Indoor
temp.), DTAI (Step Compensation of temperature difference Indoor Temp. and Setting Temp.
Comp Step = (Step base+Long piping compensation) x ΔStep TAO x ΔStep TAI x ΔStep DTAI
Step base
Standard frequency step by ∑Qj (Summation of capacity code)
Long piping
Comp. Step compensation by setting long piping
ΔStep TAO
step compensation by TAO (Outdoor temp.)
ΔStep TAI
step compensation by TAI (Indoor temp.)
ΔStep DTAI
Step Compensation of temperature difference Indoor Temp. and Setting Temp.
✽ Target frequency step (Step base) exceeds maximum step, the Step base value follows the maximum step value.
✽ The compressor get the minimum step in case Step base value is lower than the minimum step of operating
capacity.
Copyright ©2010 LG Electronics. Inc. All right reserved.
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LGE Internal Use Only
Part 3 Control logic
3. Reversing valve operation
1. At the starting (outdoor is powered on,indoor is not) reversing valve continues OFF(cooling).
2. For the cooling and defrosting operation :valve OFF, for the heating operation :valve ON
3. Method of changing mode from heating to defrosting : As defrosting starts Inverter compressor Hz is lowered to 30Hz
for 5 sec and the valve is OFF for the defrost mode. (refer “working process of each component in defrosting and
returning to heating mode ”)
4 . Method of changing mode from defrosting to heating : As the defrosting is finished inverter compressor frequency is
lowered to 30Hz for 10 sec. And the valve is ON for the heating mode.
5. If the operating mode is changed to heating from cooling, “3 min. restarting rule” is applied, and reversing valve
position is changed within 30 sec. after compressor turns OFF.
6. If the compressor is stopped during heating mode by remote controller operation or error mode, reversing valve
position is changed to OFF in 30 sec. after compressor turns OFF.
7. If the compressor is stopped during heating mode by Thermistor signal, reversing valve will remain in heating
position.
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LGE Internal Use Only
Part 3 Control logic
4. Discharge pipe control
1) There can be two situations
a) Sensor is failed (error code for sensor failure will be generated)
b) Abnormal high temperature discharge temperature (error code for high discharge will be generated)
Both cases unit will stop.
Compressor working
1. If discharge pipe temperature < T1 No limitation on compressor frequency
2. T2 ≤ discharge pipe temperature < Toff (Hysteresis control) Compressor frequency down by 5 pulse & Expansion
valve up by 10 pulse in every 1 min. If LEV is in the starting control it will follow starting control first.
3. discharge pipe temperature ≥ Toff then compressor will be OFF System will stop if this situation occurs 5 times in 1
hour and error code will be generated also self diagnosis will start.
Discharge pipe temp.
Toff:105(Option)˚C
T2:95 (Option)˚C
T1:90 (Option)˚C
COMP Hz
Set
Expansion valve
Set
5Hz(Option)
Down
10 pulse
(Option) up
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Only for training and service purposes
Set
Set
- 28 -
5Hz
(Option)
Down
10 pulse
(Option) up
OFF
Set
Stop control
Set
LGE Internal Use Only
Part 3 Control logic
5. Input Current Control
5.1 Function
Controlling total current to protect power semiconductor devices from burn-out by the low current (including connecting
mistake) and over current.
Operating process
1. Detection : check the output DC voltage of Current Transformer(CT).
5.2 Operating process
CT 1 detection :
1) If total current exceeds CT1+1 value, reduce inverter operation by 1 step.
- Step down 5Hz(Option) from current step.
- If new Hz is below minimum Hz of operation (cooling & heating), then turn off the compressor.
2) After step down, still if the total current exceed CT1 for more than 5 sec.
then step down inverter operation by 1 more step.
3) If the current continue below CT1 for more than 1 min., return the to setting step Hz.
CT 2 detection :
1) If total current exceeds CT2 turn off compressor.
And after 3 min turn on the compressor and check the current again.
2) If CT2 occurs 5 times in 1 hour,stop the operation and shows Self-Diagnosis Error Mode 22
Current(CT)
CT2
(Option)
CT1+1
(Option)
CT1
(Option)
Frequency
[Hz]
Setting Frequency
frequency
fixed
5 Hz
(Option)
Down
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Only for training and service purposes
Frequency
fixed
- 29 -
Setting
frequency
Frequency
fixed
5 Hz
(Option)
Down
OFF
LGE Internal Use Only
Part 3 Control logic
6. Outdoor Fan Control
6.1 Function
Working of outdoor fan are different in different models.
Some models are single fan some are two fan type.
6.2 Operating process
Control logic of outdoor fan depends on outdoor temperature
1. AC motor fan control
HEATING
COOLING
FAN1
OUTDOOR
TEMP.
Step_Fan + 1
41°C
FAN2
FAN1
OUTDOOR
TEMP.
Step_Fan - 1
20°C
FAN2
Step_Fan + 2
38°C
Step_Fan - 2
Step_Fan + 1
Step_Fan
Step_Fan
Step_Fan
28°C
Step_Fan - 1
14°C
Step_Fan
4°C
Step_Fan + 1
Step_Fan - 1
22°C
Step_Fan - 1
Step_Fan + 1
-3°C
Step_Fan + 2
Step_Fan - 2
10°C
Step_Fan - 3
2. DC motor fan control
COOLING
OUTDOOR
TEMP.
FAN
HEATING
OUTDOOR
TEMP.
FAN
-6
3
26°C
45°C
-4
2
22°C
41°C
-3
1
18°C
38°C
-2
0
14°C
28°C
-1
-2
10°C
24°C
-4
0
4°C
18°C
-6
1
0°C
14°C
-7
2
-4°C
9°C
-8
3
-8°C
2°C
-9
4
-3°C
-11
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LGE Internal Use Only
Part 3 Control logic
7. Defrost Control
7.1 Function
:These are about the control of compressor, fan of outdoor unit, reversing valve, LEV.
7.2 Starting to the defrosting operation
A) Defrost operation will be start when all the conditions below are matched simultaneously
Accumulation time of operation and the period after completion of defrost = 35min (Outdoor air temperature –3˚C)
B) Outdoor piping temperature is below than –6 (Option)˚C for starting defrosting operation.
7.3 Completion of defrost operation
Send signal of defrost completion in case of meeting one of the condition as below.
1. Defrosting time 7 minutes
2. Piping temperature maintain 10 seconds (Option ) in condition of more than 15˚C (Option).
7.4 Defrosting Control Algorithm
Satisfy
Defrost
Start
Condition
1
2
Satisfy
Defrost
End
Condition
Defrost
Start
3
4
5
6
Heating
Start
(Defrost flag clear)
7
8
9
10
Baseline
80 Hz (Option)
Control
Inverter Comp.
350 Pulse (Option)
Control
Outdoor LEV
ON
Defrost signal of
indoor unit on/
Starting maximum defrosting
time count
Reversing Valve
Indoor defrost signal OFF
ON
OFF
Indoor Fan
OFF
Hot
start
ON/OFF
ON
Outdoor Fan
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Only for training and service purposes
OFF
- 31 -
LGE Internal Use Only
Part 3 Control logic
8. LEV Control
8.1 Control of LEV opening
1. LEV openings have a controllable ranges 70 (option) to 460 (option) pulse in both condition of cooling and heating.
2. Products do not be operated before initializing of LEV when starting.
3. Time constant control period of LEV is every 2 minutes except below conditions.
- Control LEV every 1 minutes for 10 minutes after starting.
- When indoor capacity changed, Control LEV every 1 minutes for 10 minutes after starting
- Control LEV every 1 minutes for 10 minutes after starting in case of the special situation such as defrost completion,
oil recovery, oil equalizing control, oil supplying, current transformer limitation, limitation of discharge temperature, low
ambient operation control.
LEV
opening
(Pulse)
Power input
(Reset)
Comp
On
Comp
Off
Comp
On
460
Open
Close
0
-200
time
Initializin
Starting
control
Time constant
control
Starting
control
Off
Heating and cooling
Heating
Cooling
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LGE Internal Use Only
Part 3 Control logic
8.2 Starting control
1) Only 1 LEV will be operate as below and others are closed fully.
2) Starting control does not use the time when the system operate with partial load after (example) after finishing starting
control for 1 indoor unit, another indoor unit is ON additionally is operated with target opening of LEV.
3) The indoor units which are in the middle of starting control are continuing starting control with the opening of its
opening.
4) Urgent control by indoor piping temperature
1. LEV open 4 pulse with every 10 sec when the indoor piping temperature is below 2˚C
2. When the temperature reaches 4˚C, system return to the starting control pulse value.
Pull open
Starting LEV
opening
Target Pulse
Target step
Time (Option)
Comp starting
Time(sec)
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LGE Internal Use Only
Part 3 Control logic
9. Oil restoration operation
1) When the accumulated compressor running time is over 3 hr.(option), oil restoring operation is made for 3 minutes.
If itʼs on the way of compressor starting,itʼs made after the starting.
2) Accumulated running time is cleared after the defrosting and oil restoring operation.
Operating process :
1) Fully open all the indoorʼs LEV.
2) After the LEV opening,change the compressor step to 70 Hz(option)
3) Reversing valve will be same as in defrosting process.
4) Outdoor fan operates in low speed.
5) During this operation, if operating frequency should be changed by safety control. then follow safety control first. If
compressor should be OFF by that,stop operation.
6) The LEV openings after this operation is 120% of the opening at the point of starting.
10. Compressor warm-up control logic (at low temperatures)
A function protecting inverter compressor from damages, by increasing oil viscosity in low outdoor temperature.
For the control,compressor operates in low frequencies.
Operating condition :in case of the following 3 conditions are fulfilled at the same time
- Outdoor temperature ,D-pipe temperature, Heat sink temperature: below 0˚C
-5˚C ≤ OD temp. < 0˚C
-10˚C ≤ OD temp. < -5˚C
starting
starting
Comp. 15Hz
starting
15Hz
starting
LEV
OD temp. < -10˚C
Opening target : 0.7
0 sec. 90 sec.
Time (option)
15Hz
starting
Opening target : 0.7
0 sec.
180 sec.
Time (option)
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starting
Opening target : 0.7
0 sec.
300 sec.
Time (option)
- 34 -
LGE Internal Use Only
Part 3 Control logic
11. Heat sink control
11.1 Function
: Power module failure protection by checking the temperature of heat sink.
There is a temperature sensor for checking the heat sink temperature.
11.2 Heat sink sensor failure error
Short Check : if temperature ≥130˚C
Open Check : if temperature < - 30˚C
System will go in self diagnosis (error 65) is displayed and product stops.
11.3 Heat sink temperature control
a) Heat sink temperature < T2 : No limitation on compressor frequency
b) T2 ≤ heat sink temperature < Toff : Compressor frequency down by 5 Hz
c) Heat sink temperature ≥ Toff : Compressor will be off.
System will stop if this situation occurs 5 times in 1 hour and error code will be generated also self diagnosis will start.
If high temperature situation occurs 5 times in 1 hr system counts 1 error and after that 4 times if this situation occurs
system stops and give error code.
If the temperature reached Toff condition system will count 5 times after that and system will stop with error code.
Heat Sink temp
Toff=85(Option)˚C
T2=75 (Option)˚C
T1=70 (Option)˚C
COMP Hz
Set
frequency
5 Hz
5 Hz
Set
(Option) frequency (Option)
Down
Down
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- 35 -
OFF
Set
frequency
LGE Internal Use Only
4. Test Run
1. Check before Test Run.....................................................................................................37
2. Test Run Flow chart .........................................................................................................38
3. Test Running.....................................................................................................................39
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LGE Internal Use Only
4. Test Run
1. Check before Test Run
1
Check to see whether there is any refrigerant leakage, and check whether the power or transmission
cable is connected properly.
Check liquid pipe and gas pipe valves are fully opened.
2
NOTE: Be sure to tighten caps.
Confirm that 500 V megger shows 2.0 MΩ or more between power supply terminal block and
ground. Do not operate in the case of 2.0 MΩ or less.
3
NOTE: Never carry out mega ohm check over terminal control board.
Otherwise the control board may break.
Immediately after mounting the unit or after leaving it turned off for an extended length of
time, the resistance of the insulation between the power supply terminal board and the
ground maydecrease to approx. 2.0 MΩ as a result of refrigerant accumulation in the internal
compressor.
If the insulation resistance is less than 2.0 MΩ, turn on the main power supply.
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LGE Internal Use Only
4. Test Run
2. Test Run Flow chart
START
Test operation for indoor unit
Operate the unit in cooling mode.
Does Test operation start?
No
Refer to part4, 6 Electric part
Yes
Is cold air discharged for
more than 3 minutes ?
No
Yes
Is there any temperature
difference between intake and
discharged air?
Refer to part4, 5 Cycle part
No
Yes
Is the operating current
normal ?
No
Yes
Operation mode change
to Heating mode
Is hot air discharged ?
After Hot Start
* Check the load (In/Out Temp.)
* Check pipe length and amount of
refrigerant
* Check for abnormal sound in
outdoor unit (comp.,Fan, others )
No
Refer to Troubleshooting
Guide
Yes
Normal
• Each indoor unit should be tested.
• If the unit has accessory, it should be tested.
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LGE Internal Use Only
4. Test Run
3. Test Runing
3.1 PRECAUTIONS IN TEST RUN
• The initial power supply must provide at least 90% of the rated voltage.
Otherwise, the air conditioner should not be operated.
CAUTION:
① For test run, carry out the cooling operation first even during winter season. If heating operation is carried out
first, it leads to the trouble of compressor.
② Carry out the test run more than 5 minutes without stopping.
(Test run will be cancelled 18 minutes later automatically)
• The test run is started by pressing the room temperature checking button and down timer button for 3 seconds
at the same time.
• To cancel the test run, press any button.
3.2 CHECK THE FOLLOWING ITEMS WHEN INSTALLATION IS COMPLETE
• After completing work, be sure to measure and record trial run properties, and store measured data, etc.
• Measuring data are room temperature, outside temperature, suction temperature, blow out temperature,
air velocity, air volume, voltage, current, presence of abnormal vibration and noise, operating pressure, piping
temperature.
• As to the structure and appearance, check following items.
❏ Is the circulation of air adequate?
❏ Is the drainage OK?
❏ Is the heat insulation complete
(refrigerant and drain piping)?
❏ Is there any leakage of refrigerant?
❏ Does the romote controller works properly?
❏ Is there any error on wiring?
❏ Aren't terminal screws loosened?
M4......118N.cm{12kgf.cm} M5......196N.cm{20kgf.cm}
M6......245N.cm{25kgf.cm} M8......588N.cm{60kgf.cm}
Copyright ©2010 LG Electronics. Inc. All right reserved.
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LGE Internal Use Only
5. Trouble Shooting
1. Self-diagnosis Function.................................................................................................41
2. Pump Down.....................................................................................................................43
3. Evacuation ......................................................................................................................44
4. Gas Charging ..................................................................................................................45
5. Cycle Part ........................................................................................................................46
6. Electronic Parts ..............................................................................................................47
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LGE Internal Use Only
5. Trouble Shooting
1. Self-diagnosis Function
1.1 Error Indicator (Indoor)
Standard/Artcool Mirror Type Display
Ceiling Cassette Type Display
Displayed No. = Error code
10 degrees 1 degrees
The number of times to blink = Error code
Standard Libero Type Display
1 degrees
10 degrees
The number of times to blink = Error code
Error Indicator
• The function is to self-diagnoisis airconditioner and express the troubles identifically if there is any trouble.
• Error mark is ON/OFF for the operation LED of evaporator body in the same manner as the following table.
• If more than two troubles occur simultaneously, primarily the highest trouble fo error code is expressed.
• After error occurrence, if error is released, error LED is also released simultaneously.
• To operate again on the occurrence of error code, be sure to turn off the power and then turn on.
• Having or not of error code is different from Model.
Indoor Error
Error code
Indoor Status
Description
00
No Error
ON
01
Indoor Room themistor error
OFF
02
Indoor in-piping sensor error
OFF
03
Remote controller error
OFF
04
Drain Pump error
OFF
05
Communcation error between in and out
OFF
06
Indoor Out-Piping sensor error
OFF
07
Differnt mode operation
OFF
09
EEPROM Check Sum Error
OFF
10
Indoor BLDC Fan Lock
OFF
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LGE Internal Use Only
5. Trouble Shooting
1.3 Error Indicator (Outdoor)
Outdoor Error
Ex) Error 21 (DC Peack)
2 Times
2 Times
2 Times
LED01G
(RED)
1 Sec.
1 Sec.
1 Time
1 Sec.
1 Time
1 Time
LED02G
(GREEN)
2 Sec.
Error
Code
2 Sec.
Contents
LED01G/M LED02G/M
(Red)
(Green)
Outdoor
Status
Case of Error
21
DC Peak (IPM Fault)
2times ◑
1time ◑
Over Rated Current
Off
22
CT 2(Max CT)
2times ◑
2times ◑
Input Over Current
Off
23
DC Link Low Volt.
2times ◑
3times ◑
DC Link Volt is below 140Vdc
Off
24
L_P/H_P Switch
2times ◑
4times ◑
Low/High Press Switch Open
Off
25
Low Voltage/Over Voltage
2times ◑
5times ◑
Abnormal AC Volt Input
Off
26
DC Compressor Position Error
2times ◑
6times ◑
Compressor Starting Fall Error
Off
27
PSC/PFC Fault Error
2times ◑
7times ◑
Inverter PCB input current is over100A(peak) for 2us
Off
28
DC Link High Volt
2times ◑
8times ◑
Off
Off
29
COMP Over Current
2times ◑
9times ◑
Over Inverter Compressor Current
Off
32
D-Pipe High (INV)
3times ◑
2times ◑
Off
Off
40
CT Sensor (Open / Short)
4times ◑
O
CT Circuit Malfunction
Off
41
INV. D-Pipe Th Error
4times ◑
1time ◑
Open/Short
Off
44
Outdoor Air Th Error
4times ◑
4times ◑
Open/Short
Off
45
Cond. Pipe Th Error
4times ◑
5times ◑
Open/Short
Off
46
Suction Pipe Error
4times ◑
6times ◑
Open/Short
Off
51
Capacity Over
5times ◑
1time ◑
Over combination
Off
52
Signal Error(DSP Board <-> Main Board)
5times ◑
2times ◑
Communication Poorly
Off
53
Signal Error (Indoor <-> Outdoor)
5times ◑
3times ◑
Communication Poorly
Off
60
EEPROM Check Sum Error
6times ◑
O
Check Sum Mismatching
Off
61
Cond. Pipe Th High
6times ◑
1time ◑
Cond. Temp. High
Off
62
Heatsink Th High
6times ◑
2times ◑
Heatsink Temp. High
Off
65
Heatsink Th Error
6times ◑
5times ◑
Open/Short
Off
67
Outdoor BLDC Fan Lock
6times ◑
7times ◑
Outdoor Fan is not operating
Off
73
PFC Fault Error(S/W)
7times ◑
3times ◑
Over Current of Outdoor Unit PFC
Off
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LGE Internal Use Only
5. Trouble Shooting
2. Pumping Down
Liquid side
Indoor unit
2-Way
valve
Open
Outdoor unit
Gas side
Closed
3-Way
valve
Lo
CLOSE
CLOSE
Purge the air
• Procedure
(1) Confirm that both the 2-way and 3-way valves
are set to the open position.
– Remove the valve stem caps and confirm that
the valve stems are in the raised position.
– Be sure to use a hexagonal wrench to operate
the valve stems.
(6) Operate the air conditioner at the cooling
cycle and stop it when the gauge indicates
1kg/cm2g.
(7) Immediately set the 3-way valve to the closed
position.
– Do this quickly so that the gauge ends up indicating 3 to 5kg/cm2g.
(2) Operate the unit for 10 to 15 minutes.
(3) Stop operation and wait for 3 minutes, then
connect the charge set to the service port of
the 3-way valve.
– Connect the charge hose with the push pin to
the service port.
(8) Disconnect the charge set, and mount the 2way and 3-way valveʼs stem nuts and the service port nut.
– Use torque wrench to tighten the service port
nut to a torque of 1.8 kg.m.
– Be sure to check for gas leakage.
(4) Air purging of the charge hose.
– Open the low-pressure valve on the charge set
slightly to air purge from the charge hose.
(5) Set the 2-way valve to the closed position.
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LGE Internal Use Only
5. Trouble Shooting
3. Evacuation (All amount of refrigerant leaked)
Liquid side
Indoor unit
Outdoor unit
3-Way
valve
Open
Gas side
3-Way
valve
Open
Vacuum pump
Vacuum
Gage
Lo
OPEN
OPEN
• Procedure
(1) Connect the vacuum pump to the center hose
of charge set center hose
(2) Evacuation for approximately one hour.
– Confirm that the gauge needle has moved
toward 0.8Torr.
(3) Close the valve (Lo side) on the charge set,
turn off the vacuum pump, and confirm that
the gauge needle does not move (approximately 5 minutes after turning off the vacuum
pump).
(4) Disconnect the charge hose from the vacuum
pump.
– Vacuum pump oil.
If the vacuum pump oil becomes dirty or
depleted, replenish as needed.
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LGE Internal Use Only
5. Trouble Shooting
4. Gas Charging (After Evacuation)
Liquid side
Indoor unit
3-Way
valve
Open
Outdoor unit
Gas side
Open
3-Way
valve
Check valve
Charging
cylinder
Lo
(1)
OPEN
Vacuum
Gage
• Procedure
(1) Connect the charge hose to the charging
cylinder.
– Connect the charge hose which you dis-connected from the vacuum pump to the valve at
the bottom of the cylinder.
– If you are using a gas cylinder, also use a
scale and reverse the cylinder so that the system can be charged with liquid.
(2) Purge the air from the charge hose.
– Open the valve at the bottom of the cylinder
and press the check valve on the charge set to
purge the air. (Be careful of the liquid refrigerant). The procedure is the same if using a gas
cylinder.
(3) Open the valve (Lo side on the charge set and
charge the system with liquid refrigerant.
– If the system can not be charged with the specified amount of refrigerant, it can be charged
with a little at a time (approximately 150g each
time) while operating the air conditioner in the
cooling cycle; however, one time is not sufficient, wait approximately 1 minute and then
repeat the procedure (pumping down-pin).
Copyright ©2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
This is different from previous procedures.
Because you are charging with liquid refrigerant
from the gas side, absolutely do not attempt to
charge with larger amounts of liquid refrigerant
while operating the air conditioner.
(4) Immediately disconnect the charge hose from
the 3-way valveʼs service port.
– Stopping partway will allow the gas to be discharged.
– If the system has been charged with liquid
refrigerant while operating the air conditioner
turn off the air conditioner before disconnecting
the hose.
(5) Mount the valve stem nuts and the service
port nut.
– Use torque wrench to tighten the service port
nut to a torque of 1.8 kg.m.
– Be sure to check for gas leakage.
- 45 -
LGE Internal Use Only
5. Trouble Shooting
5. Cycle Part
Trouble analysis
1. Check temperature difference between intake and discharge air, and check for the operating current too.
Case
Symptom
Supposed Caused
Case 1
Temp. difference : approx. 0°C
Current : less than 80% of rated current
All amount of refrigerant leaked out.
Check refrigeration cycle.
Case 2
Temp. difference : approx. 8°C
Current : less than 80% of rated current
Refrigerant leakage Clog of refrigeration cycle
Defective Compressor.
Case 3
Temp. difference : less than 8°C
Current : over the rated current
Excessive amount of refrigerant
Case 4
Temp. difference : over 8°C
Normal
NOTICE
Temperature difference between intake and discharge air depends on room air humidity. When the room air humidity is
relativery higher, temperature difference is smaller. When the room air humidity is relatively lower temperature difference
is larger.
2. Check temperature and pressure of refrigeration cycle in cooling mode.
Suction pressure
(Compared with
the normal value)
Temperature of
Discharge Air (Compared
with the normal valve)
Cause of Trouble
High
Defective compressor
Defective 4-way reverse valve
Current is low.
Excessive amount of
refrigerant
High pressure does not quickly
rise at the beginning of
operation.
Insufficient amount of
refrigerant (Leakage)
Clogging
Current is low.
Higher
Normal
Lower
Higher
Description
NOTICE
1. The suction pressure is usually 8.5~9.5kg/cm2G(Cooling) at normal condition.(R410A)
2. The temperature can be measured by attaching the thermometer to the low pressure tubing and wrap it with putty.
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LGE Internal Use Only
5. Trouble Shooting
6. Electronic Parts
6.1 The Product doesn’t operate at all
Turn off the main power and
wait for 10 seconds.
Turn on the main power again.
A "Beeping" sound is made
from the indoor unit
Yes
Primarily, the operating condition of
Micom is O.K.
* Check, Remote controller & Receiver.
* Check CN-DISP1, CN-DISP2 of
indoor PCB
No
Check the voltage of power supply (AC230V, 50Hz) and check
for the following :
* The voltage of main power supply.
* The voltage applied to the unit.
* The connecting method of Indoor/Outdoor connecting cable (each color)
* The P.C.B. Assembly (Fuse, Noise Filter, Power Module, Bridge Diode, etc.)
The operation check of the Indoor P.C.B. Ass'y
Procedure
Specification
Remedy
1) The input voltage of power module.
1) AC230V ± 30V
: Check the rated voltage
1) Check the power outlet.
2) The output voltage of power module.
2) 12V ± 3V
2) Replace
P.C.B Ass'y
4) IC04D(7805)
4) DC5V
4) Replace P.C.B Ass'y
5) IC01A(KIA7036)
5) The voltage of micom pin 19
: DC4.5V↑
5) Replace P.C.B Ass'y
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LGE Internal Use Only
5. Trouble Shooting
6.2 The Product doesn't operate with the remote controller
Turn on the main power
A "Beeping" sound is made
from the indoor unit
No
* Refer to 10.1
Yes
Is it possible to turn on the unit
by ON/OFF button on display?
No
* Check the voltage of power
(AC230V, 50Hz).
Yes
Is the remote controller
working properly?
No
* When the mark ( ) is displayed
in LCD screen, replace battery.
Yes
* Check the contact point of CN-DISP 1, 2 connector & Re connector.
* Check display P.C.B Assembly
- Voltage between CN-DISP1 3 - 6 should be DC +5V,
- If problem still persists, Replace display PCB
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LGE Internal Use Only
5. Trouble Shooting
6.3 The Compressor/Outdoor Fan are don't operate
Turn on the main power.
Operate Cooling Mode by setting the disired temperature of the remote controller is less
than one of the Indoor temperature by 1°C at least.
When in air circulation mode, compressor/outdoor fan is stopped.
Check the sensor for Indoor temperature is attatched as close as to be effected by the
themperature of Heat Exchange (EVA.)
When the sensor circuit for Indoor temperature and connector are in bad connection or are
not engaged, Compressor/Outdoor fan is stopped.
• Check the related circuit of R02H(12.1K), R01H(1K), R04H(6.2K), R03H(1K), C01H(102),
C02H(102), Micom(pin No. ⑪, ⑫).
• Check the Indoor temperature sensor is disconnected or not (about 10K at 25°C).
Check the Relay(RY-PWR, RY-START) for driving Compressor.
• Check the voltage between brown and blue cable of terminal to connect the Outdoor
(About AC220V / 240V).
• Check the related circuit of relay in Outdoor PCB Ass'y.
Check Point
Comp. ON
Comp. OFF
Between Micom(No. 19) and
GND
DC 5V
DC 0V
Between IC01M(No. 10) and
GND
DC 1V↓
DC 12V
Turn off main power.
Check the electrical wiring diagram of Outdoor side.
Check the open or short of connecting wires between Indoor and Outdoor.
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LGE Internal Use Only
5. Trouble Shooting
6.4 When indoor Fan does not operate.
Turn off main power.
Check the connection of CN-FAN.
Check the Fan Motor.
Check the Fuse(AC250V, T2A).
Check the related circuit of indoor Fan Motor.
• The pin No. 38 of micom and the part for driving SSR.(Q01M)
• Check the related pattern.
• Check the SSR.
- SSR Open: Indoor Fan Motor never operate.
- SSR short: Indoor Fan Motor always operates in case of ON or OFF.
Turn on the main power
Check the SSR high speed operation by remote control.
(the Indoor Fan Motor is connected)
The voltage of Pin No 1(orange) and 3(black) of CN-FAN.
About AC 160V over
About AC 50V over
SSR is not damaged
Check SSR
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LGE Internal Use Only
5. Trouble Shooting
6.5 When the louver does not operate.
• Confirm that the vertical louver is normally geared with the shaft of Stepping Motor.
• If the regular torque is detected when rotating the vertical louver with hands ⇒ Normal
• Check the connecting condition of CN-U/D or CN0L/R Connector
• Check the soldering condition(on PCB) of CN-U/D or CN0L/R Connector
Check the operating circuit of the vertical louver
• Confirm that there is DC +12V between pin ➀ of CN-U/D, CN0L/R and GND.
• Confirm that there is a soldering short at following terminals.
- Between 1 , 2 , 3 and 4 of MICOM
- Between 17 , 18 , 19 and 20 of MICOM
- Between 4 , 5 , 6 and 7 of IC01M
- Between 5 , 6 , 7 and 8 of IC01M
If there are no problems after above checks.
• Confirm the assembly condition that are catching and interfering parts in the link of the
vertical louver
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LGE Internal Use Only
5. Trouble Shooting
6.6 Troubleshooting Indoor Error
Display
code
Title
01
Indoor air sensor
• Open / Short
• Soldered poorly
• Internal circuit error
Normal resistor : 10KΩ/ at 25°C (Unplugged)
Normal voltage : 2.5Vdc / at 25°C (plugged)
02
Indoor inlet pipe sensor
• Open / Short
• Soldered poorly
• Internal circuit error
Normal resistor : 5KΩ/ at 25°C (Unplugged)
Normal voltage : 2.5Vdc / at 25°C (plugged)
06
Indoor outlet pipe sensor
• Open / Short
• Soldered poorly
• Internal circuit error
Normal resistor : 5KΩ/ at 25°C (Unplugged)
Normal voltage : 2.5Vdc / at 25°C (plugged)
Cause of error
Check point & Normal condition
10kΩ
2.5Vdc
Ω
V
Check the resistance
Check the voltage
Check Point
1. Unplug the sensor on Indoor unit PCB.
2. Estimate the resistance of each sensor.
3. If the resistance of the sensor is 10KΩ/ 5KΩ at 25°C, then sensor is normal.
4. If the resistance of the sensor is 0 KΩ or ∞, then sensor is abnormal. → Change the sensor.
5. Plug the sensor on Indoor unit PCB and Power ON.
6. Estimate the voltage of each sensor.
7. If the voltage of the sensor is 2.5Vdc at 25°C, then sensor is normal.
8. If the resistance of the sensor is 0 or 5Vdc, then sensor is abnormal. → Repair or Change the PCB.
Copyright ©2010 LG Electronics. Inc. All right reserved.
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LGE Internal Use Only
5. Trouble Shooting
Display
code
Title
03
Communication
Wired R/C
Cause of error
Wired R/C
12V
S
• Open / Short
• Wrong connection
Indoor Unit
GND
12V
S
• Connection of wire
• Main PCB Volt. DC12V
• Noise interference
CN-REMO
GND
12Vdc
12Vdc
V
V
Check the Volt.
Check point & Normal condition
Check the Volt.
Check Point
1. Check the wire connection. (Open / Short) → Repair the connection
2. Check the soldering state of connector. (Soldered poorly) → Repair or Change the PCB.
3. Check the volt. Of main PCB power source. (DC 12V, DC 5V) → Repair or Change the main PCB.
4. Check the installation of wired remote controller. (Noise interference) → Adjust the state of installation
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LGE Internal Use Only
5. Trouble Shooting
Display
code
Title
04
Drain pump
/ Float switch
Cause of error
• Float switch Open.
(Normal : short)
Check point & Normal condition
• The connection of wire(Drain pump/ Float switch)
• Drain pump power input. (220V)
• Drain tube installation.
• Indoor unit installation. (Inclination)
CN Float
CN-D/PUMP
CN-Float
0Ω
Ω
Check the resistance
Check Point
1. Check the wire connection. (Open, Soldered poorly) → Repair the connection or change the PCB.
2. Check the resistance of float switch (Abnormal : Open, Normal : short) → Check the float switch.
3. Check the level of water
4. Check the volt. Of Drain pump power supply. (AC 230V) → Repair or Change the main PCB.
Copyright ©2010 LG Electronics. Inc. All right reserved.
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LGE Internal Use Only
5. Trouble Shooting
Display
code
Title
07
Different Operation Mode
Cause of error
Check point & Normal condition
• One of Indoor Unit operate cooling Another Unit • At the same time, this model cannot use cool and
heating mode
operate heating
Check Point
1. Check another indoor model operation mode
2. Operating the same mode with the first operated indoor unit
3. Clearing the "CH07"
Press the on/off button or mode change button and matching the indoor unit mode same as the first operated
indoor unit
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LGE Internal Use Only
5. Trouble Shooting
Display
code
Title
09
Indoor EEPROM Check
Sum Error
Cause of error
• Check sum error
Check point & Normal condition
1. Check the poor soldering
2. Check the insertion condition of the EEPROM
3. Check the PCB Connection
<EEPROM Direction Check Point>
Check Point
1. Check the EEPROM Direction
2. If the EEPROM value & the Program value are not matched, the Code is Displayed
3. After Checking the connection and Insertion, replace the PCB or Option PCB
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LGE Internal Use Only
5. Trouble Shooting
Display
code
Title
Cause of error
10
Indoor BLDC Fan Motor
Lock
The Fan is not operated
properly
Yellow
Check point & Normal condition
Check the Indoor fan locking
White
Blue
Black Red
Fan motor
connector
Tester
Check Point
Check the PCB during the Power on
1. Check the Voltage Red line to Black line
→ The Voltage is about [input voltage x 1.414]
→ if the Voltage does not come with the above Voltage,
→ Check the power input
→ Replace the PCB & Motor
2. Check the Voltage Black line to White
→ the Voltage is DC 15V
→ Check the Power input
→ Replace the motor
Check the Motor
1. Check the shaft
→ if the shaft is not turn smoothly, the Motor Power IC is defected
→ replace the motor
2. Check the motor resistance(if the shaft is turn smoothly, check the resistance)
→ Check Red line to Black line, Blue line to Black line
→ The resistance should infinite
→ replace the motor
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LGE Internal Use Only
5. Trouble Shooting
6.7 Troubleshooting Outdoor Error
Display
code
Title
05
/
53
Title
Communication
(Indoor → Outdoor)
Cause of error
• Communication poorly
Check point & Normal condition
• Power input AC 230V. (Outdoor, Indoor)
• The connector for transmission is disconnected.
• The connecting wires are misconnected.
• The communication line is shorted at GND.
• Transmission circuit of outdoor PCB is abnormal.
• Transmission circuit of indoor PCB is abnormal.
Check Point
1. Check the input power AC230V. (Outdoor, Indoor unit)
2. Check the communication wires are correctly connected.
Adjust the connection of wire Confirm the wire of "Live",
"Neutral"
3. Check the resistance between communication line and
GND. (Normal : Over 2MΩ)
4. Check the connector for communication is correctly connected.
5. If one indoor unit is operated normally, outdoor PCB is no
problem.
Check the another indoor unit.
* CH05 is displayed at indoor unit, CH53 is displayed at
outdoor unit.
6. If all indoor unit is displayed CH05 but outdoor PCB not
display
CH53 : Check the CN_COM and CN_POWER is correctly
connected.
L
N
< TERMINAL BLOCK >
• 24k/36k
1. In Case of CH53, Check the Connection → L , N at the terminal block
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LGE Internal Use Only
5. Trouble Shooting
Display
code
Title
Cause of error
• Instant over current
• Over Rated current
• Poor insulation of IPM
DC PEAK
(IPM Fault)
21
Check point & Normal condition
• An instant over current in the U,V,W phase
- Comp lock
- The abnormal connection of U,V,W
• Over load condition
- Overcharging of refrigerant
Pipe length.
Outdoor Fan is stop
• Poor insulation of compressor
■ Error Diagnosis and Countermeasure Flow Chart
1. Check Pipe clogging/distortion
2. Check Covering (Indoor/Outdoor Unit)
3. Check EEV connector assemble condition/normal
operation
4. Check refrigerant pressure
Reassemble or manage if abnormality found
No
Is installation
condition normal?
Yes
Are the resistance
Between each phase and
insulation resistance of Inverter
compressor normal?
1. Check resistance between each terminal of compressor
(0.34~0.35
7%)
2. Check insulation resistance between compressor
terminal and pipe (over 50M )
Replace compressor if abnormality found
No
Yes
Is compressor
Wire connection
condition normal?
No
1. Check inverter PCB assembly U,V,W connector
connection condition
2. Check wire disconnection and wiring
3. Check compressor terminal connection condition
(bad contact)
Reassemble if abnormality found
No
Check inverter PCB assembly IPM normality
Replace inverter PCB assembly
Yes
Is inverter PCB assembly normal?
Yes
Recheck power and installation condition
■ Comp checking method
Comp
U
Resistance(Ω) at 20°C
Ω
V
U-V
V-W
W-U
W
Comp
Terminal
Copper
pipe
Inverter Constant
comp.
comp.
0.64
0.64
0.64
0.8
0.8
0.8
Resistance(Ω) at 20°C
Terminal
Ω
U-GND
V-GND
W-GND
Inverter Constant
comp.
comp.
2MΩ
2MΩ
2MΩ
Copyright ©2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
2MΩ
2MΩ
2MΩ
- 59 -
LGE Internal Use Only
5. Trouble Shooting
LED01M
LED02M
U,V,W CONNECTOR
U
V
W
1. Wait until inverter PCB DC voltage is discharged after main power off.
2. Pull out V, V, W COMP connector.
3. Set multi tester to resistance mode.
4. If the value between P and N terminal of IPM is short(0Ω) or open(hundreds MΩ), PCB needs to be replaced.(IPM damaged)
5. Set the multi tester to diode mode.
6. In case measured value is different from the table, PCB needs to be replaced.(PCB damaged).
P
U
V
W
Nu Nv Nw
P
U
V
W
Nu Nv Nw
27
26
25
24
23 22 21
27
26
25
24
23 22 21
0.4 ~ 0.6 V
0.4 ~ 0.6 V
PFC_IPM chec
U, V, W ➔ R S
CAUTION
In case that the control box is opend and before checking electrical parts, it should be checked that the
LED 01M, 02M turned off(wait 7 minutes after main power OFF), otherwise it may cause electrical shock.
Copyright ©2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 60 -
LGE Internal Use Only
5. Trouble Shooting
Display
code
22
Title
Cause of error
Max. C/T
Input Over Current(18k13A↑, 24k/36k-20A↑)
Check point & Normal condition
1. Malfunction of Compressor
2. Blocking of Pipe
3. Low Voltage Input
4. Refrigerant, Pipe length, Blocked...
■ Error Diagnosis and Countermeasure Flow Chart
Is installation
condition normal?
No
Yes
Are the resistance
Between each phase and
insulation resistance of Inverter
compressor normal?
No
1. Check Pipe clogging/distortion
2. Check Covering (Indoor/Outdoor Unit)
3. Check EEV connector assemble condition/normal
operation
4. Check refrigerant pressure
→ Reassemble or manage if abnormality found
1. Check resistance between each terminal of compressor
(0.188 ±7%)
2. Check insulation resistance between compressor
terminal and pipe (over 50MΩ )
→ Replace compressor if abnormality found
Yes
Is compressor
Wire connection
condition normal?
No
1. Check inverter PCB assembly U,V,W connector
connection condition
2. Check wire disconnection and wiring
3. Check compressor terminal connection condition
(bad contact)
→ Reassemble if abnormality found
Yes
Is inverter PCB assembly
power connection normal?
No
Check connection between inverter PCB assembly and
bridge diode(misconnection, disconnection)
→ wiring again if abnormality found
No
Check
L~N phase is 220V ±15%
→ Check connection condition and wiring if power is
abnormal
No
Check inverter PCB assembly IPM normality
→ Replace inverter PCB assembly
Yes
Is input voltage normal?
Yes
Is inverter PCB assembly
normal?
Yes
Recheck power and installation condition
Copyright ©2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 61 -
LGE Internal Use Only
5. Trouble Shooting
Check Point
1. Check the power source.(220V ±15%)
2. Check the fan operation is right.
3. Check the current.
4. Check the install condition.
5. Check the CT Sensor Output signal
- Check output the CT Sensor : DC 2.5±0.2V
Vdc
< Input Power Source Check Point >
< Main PCB>
<CT Sensing Check Point>
Copyright ©2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 62 -
LGE Internal Use Only
5. Trouble Shooting
Display
code
23
Title
DC Link Low voltage
Cause of error
• DC Link volt is below
140Vdc
Check point & Normal condition
• Check point & Normal condition
• Check theCN_(L),CN_(N) Connection.
• At not operating : DC Link voltage(280V↑)
• At Comp operating : DC Link voltage(340V↑)
■ Error Diagnosis and Countermeasure Flow Chart
No
Check L~N Voltage is 220V±15%
Is input voltage normal ?
Yes
No
Is Inverter PCB assembly
Power connection normal?
Check connection from terminal block to
Inverter PCB assembly CN(L), CN(N)
Yes
No
Is Inverter PCB Normal?
Replace inverter PCB assembly
Yes
Recheck power and installation
condition
Copyright ©2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 63 -
LGE Internal Use Only
5. Trouble Shooting
Check Point
1. Check the WCN_P(L),P(N) Connection condition at the Main PCB.(Refer to outdoor wiring diagram)
2. Check the DC Link voltage at not operating(280V↑)
3. Check the DC Link voltage at Comp operating(340V↑)
4. Check DC Link Sensing Signal :2.4~2.8V (Refer the Picture)
< Input Power Source Check Point >
Vdc
< Main PCB>
Vdc
<DC_LINK Sensing Check Point>
<DC Link Voltage Check Point>
Copyright ©2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 64 -
LGE Internal Use Only
5. Trouble Shooting
Display
code
Title
24
Press S/W Open
Cause of error
• Low / High press
S/W open.
Check point & Normal condition
• Check the connection CN_L/PRESS,H/PRESS
• Check the components.
■ Error diagnosis and countermeasure flow chart
Is high pressure switch
connector connected
to PCB?*
No
Connect securely
Yes
Is high pressure switch
connector short
during off time?**
No
Replace high pressure switch
Yes
Is SVC valve open?
No
Open SVC valve
Yes
Is this error appeared
again after reset?
No
Re-check momentary
problem or not
Yes
Is high pressure
more than 2500kPa
at manifold gauge?
No
Replace PCB
Yes
Is high pressure of
LGMV similar as
at manifold gauge?
No
Replace high pressure sensor
Yes
Check pipe is blocked or
not and take measure
Copyright ©2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 65 -
LGE Internal Use Only
5. Trouble Shooting
Check Point
1. Check the connection of H/press switch
2. Check short or not at the connector of high pressure switch (Normal open)
< Main PCB : Connection Check Point >
Copyright ©2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
< Checking the Press switch >
- 66 -
LGE Internal Use Only
5. Trouble Shooting
Display
code
Title
Cause of error
25
Input voltage
• Abnormal Input voltage
(140Vac , 300Vac)
Check point & Normal condition
• Check the power source.
• Check the components.
■ Error Diagnosis and Countermeasure Flow Chart
Is input voltage normal ?
No
Check L~N Voltage is 220V±15%
Yes
Is Inverter PCB Normal?
No
Replace inverter PCB assembly
Yes
Recheck power and
installation condition
Check Point
1. Check the Input Voltage (L–N ➔ 220V±10%)
2. Check Input Voltage Sensor output voltage (2.5Vdc±10%)
< Input Power Source Check Point >
Copyright ©2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 67 -
LGE Internal Use Only
5. Trouble Shooting
Vdc
< Inverter PCB>
< Input Voltage Sensing Check Point >
INPUT(V)
GND
Copyright ©2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 68 -
LGE Internal Use Only
5. Trouble Shooting
Display
code
Title
26
DC Compressor
Position
Cause of error
• Compressor
Starting fail error
Check point & Normal condition
• Check the connection of comp wire “U,V,W”
• Malfunction of compressor
• Check the component of “IPM”, detection parts.
■ Error Diagnosis and Countermeasure Flow Chart
Is installation
condition normal?
No
1. Check Pipe clogging/distortion
2. Check Covering (Indoor/Outdoor Unit)
3. Check EEV connector assemble condition/normal
operation
4. Check refrigerant pressure
→ Reassemble or manage if abnormality found
Yes
Are the resistance
Between each phase and
insulation resistance of Inverter
compressor normal?
No
1. Check resistance between each terminal of compressor
(0.188 ±7%)
2. Check insulation resistance between compressor
terminal and pipe (over 50MΩ )
→ Replace compressor if abnormality found
Yes
Is compressor
Wire connection
condition normal?
No
1. Check inverter PCB assembly U,V,W connector
connection condition
2. Check wire disconnection and wiring
3. Check compressor terminal connection condition
(bad contact)
→ Reassemble if abnormality found
No
Check inverter PCB assembly IPM normality
→ Replace inverter PCB assembly
Yes
Is inverter PCB assembly normal?
Yes
Recheck power and installation condition
Copyright ©2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 69 -
LGE Internal Use Only
5. Trouble Shooting
Display
code
27
Title
Cause of error
Check point & Normal condition
1. Overload operation (Pipe clogging/Covering/EEV
defect/Ref. overcharge)
2. Compressor damage (Insulation damage/Motor
Inverter PCB input
damage)
current is over100A(peak)
3. Input voltage abnormal (L,N)
for 2us
4. Power line assemble condition abnormal
5. Inverter PCB assembly Damage (input current
sensing part)
AC Input Instant over
Current Error
■ Error Diagnosis and Countermeasure Flow Chart
Is installation
condition normal?
No
Yes
1.Check Pipe clogging/distortion
2.Check Covering (Indoor/Outdoor Unit)
3.Check EEV connector assemble condition/normal operation
4.Check refrigerant pressure
→ Reassemble or manage if abnormality found
No
Check
L~N phase voltage is 220V ±15%
→ Check connection condition and wiring if power is abnormal
No
1.Check L,N connection condition
2.Check wire disconnection and wiring
→ Reassemble if abnormality found
No
1.Check inverter PCB assembly U,V,W connector connection condition
2.Check wire disconnection and wiring
3.Check compressor terminal connection condition(bad contact)
→ Reassemble if abnormality found
Is input voltage normal?
Yes
Is AC input Wire connection
condition normal?
Yes
Is compressor
Wire connection
condition normal?
Yes
Is inverter PCB assembly
normal?
No
Check inverter PCB assembly PFCM normality
→ Replace inverter PCB assembly
Yes
Recheck power and
installation condition
※ PFCM Moudle checking method
① Set the multi tester to diode mode.
② Check short between input signal pin which are
placed below PFC Module
③ Replace PCB assembly if it is short between pins
except No.4,5 pins.
Signal pin
CAUTION
PFCM module No.4,5 pins are internal short state.
Copyright ©2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
8
- 70 -
1
LGE Internal Use Only
5. Trouble Shooting
Display
code
Title
Cause of error
28
Inverter DC link high
voltage error
Inv PCB DC link voltage
supplied over 420V
Check point & Normal condition
1. Input voltage abnormal (L~N)
2. ODU inverter PCB damage(DC Link voltage
sensing part)
■ Error Diagnosis and Countermeasure Flow Chart
No
Is input voltage normal ?
Check L~N Voltage is 220V±15%
Yes
Is Inverter PCB assembly
Power connection normal?
No
Check connection from terminal block to
Inverter PCB assembly CN(L), CN(N)
Yes
No
Is Inverter PCB Normal?
Replace inverter PCB assembly
Recheck power and installation
condition
Copyright ©2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 71 -
LGE Internal Use Only
5. Trouble Shooting
Check Point
1. Check the CN_(L),CN_(N) Connection condition at the Inverter PCB.(Refer to outdoor wiring diagram)
2. Check the DC Link voltage at not operating(280V↑)
3. Check the DC Link voltage at Comp operating(340V↑)
4. Check DC Link Sensing Signal : 2.4~2.8V (Refer the Picture)
< Input Power Source Check Point >
Vdc
< Main PCB>
Vdc
<DC_LINK Sensing Check Point>
<DC Link Voltage Check Point>
Copyright ©2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 72 -
LGE Internal Use Only
5. Trouble Shooting
Display
code
29
Title
Inverter compressor over
current
Cause of error
Check point & Normal condition
1. Overload operation
(Pipe clogging/Covering/EEV defect/Ref. overcharge)
Inverter compressor input
2. Compressor damage(Insulation damage/Motor
current is over 30A
damage)
3. Input voltage low
4. ODU inverter PCB assembly damage
■ Error Diagnosis and Countermeasure Flow Chart
Is installation
condition normal?
No
Yes
Are the resistance
Between each phase and
insulation resistance of Inverter
compressor normal?
No
1. Check Pipe clogging/distortion
2. Check Covering (Indoor/Outdoor Unit)
3. Check EEV connector assemble condition/normal
operation
4. Check refrigerant pressure
→ Reassemble or manage if abnormality found
1. Check resistance between each terminal of compressor
(0.188 ±7%)
2. Check insulation resistance between compressor
terminal and pipe (over 50MΩ )
→ Replace compressor if abnormality found
Yes
Is compressor
Wire connection
condition normal?
No
1. Check inverter PCB assembly U,V,W connector
connection condition
2. Check wire disconnection and wiring
3. Check compressor terminal connection condition
(bad contact)
→ Reassemble if abnormality found
Yes
Is input voltage normal?
No
Check
L~N phase is 220V ±15%
→ Check connection condition and wiring if power is
abnormal
No
Check inverter PCB assembly IPM normality
→ Replace inverter PCB assembly
Yes
Is inverter PCB assembly
normal?
Yes
Recheck power and installation condition
Copyright ©2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 73 -
LGE Internal Use Only
5. Trouble Shooting
Display
code
Title
32
D-pipe (Inverter)
temp. high
(105°C↑)
Cause of error
Check point & Normal condition
• Discharge sensor
(Inverter) temp. high
• Check the discharge pipe sensor for INV.
• Check the install condition for over load.
• Check the leakage of refrigerant.
• Check the SVC V/V open.
D-Pipe temp.
Toff(105) °C
T2(95) °C
T1(90) °C
COMP Frequency
Normal
(Hz)
LEV Openness
(Pulse)
Normal
Normal
OFF
Normal
OFF Control
Check Point
1. Check the install condition for over load.
2. Check the SVC V/V open.
3. Check the leakage of refrigerant.
Copyright ©2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 74 -
LGE Internal Use Only
5. Trouble Shooting
Display
code
Title
C/T
Sensor Error
40
Cause of error
Check point & Normal condition
• Initial current error
• Malfunction of current detection circuit.
(Open / Short)
• Check CT Sensor output voltage :
2.5Vdc ±5%
■ Error Diagnosis and Countermeasure Flow Chart
Is input voltage normal ?
No
Check L~N Voltage is 220V±15%
Yes
Is Inverter PCB Normal?
No
Replace inverter PCB assembly
Yes
Recheck power and
installation condition
Check Point
1. Check the Input Voltage (L–N ➔ 220V±10%)
2. Check Input Voltage Sensor output voltage (2.5Vdc±10%)
< Input Power Source Check Point >
Copyright ©2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 75 -
LGE Internal Use Only
5. Trouble Shooting
Vdc
1
2
3
< CT Sensing Check Point >
< Inverter PCB>
Display
code
Title
52
Transmission error
between (Inverter PCB ➔
Main PCB)
Cause of error
Check point & Normal condition
Main controller of Master 1. Power cable or transmission cable is not
connected
unit of Master unit canʼt
2.
Defect of outdoor Main fuse/Noise Filter
receive signal from
3.
Defect of outdoor Main / inverter PCB
inverter controller
INPUT(CT)
■ Error diagnosis and countermeasure flow chart
Is transmission
LED (Yellow) of inverter
compressor
PCB on?
No
Is noise filter or fuse
normal?
GND
No
Replace noise filter or fuse
Yes
Yes
Replace inverter compressor PCB
Is transmission cable
connected correctly?
No
Re-connect transmission cable
Yes
No
Is MAIN PCB normal?
Replace MAIN PCB
Yes
Replace inverter compressor PCB
Copyright ©2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 76 -
LGE Internal Use Only
5. Trouble Shooting
Display
code
Title
41
D-pipe sensor (Inverter)
• Open / Short
• Soldered poorly
• Internal circuit error
• Normal resistor : 200KΩ / at 25°C (Unplugged)
• Normal voltage : 4.5Vdc / at 25°C (plugged)
44
Air sensor
• Open / Short
• Soldered poorly
• Internal circuit error
• Normal resistor : 10KΩ / at 25°C (Unplugged)
• Normal voltage : 2.5Vdc / at 25°C (plugged)
45
Condenser Pipe sensor
• Open / Short
• Soldered poorly
• Internal circuit error
• Normal resistor : 5KΩ / at 25°C (Unplugged)
• Normal voltage : 2.5Vdc / at 25°C (plugged)
Suction Pipe sensor
• Open / Short
• Soldered poorly
• Internal circuit error
• Normal resistor : 5KΩ / at 25°C (Unplugged)
• Normal voltage : 2.5Vdc / at 25°C (plugged)
Heat sink sensor
• Open / Short
• Soldered poorly
• Internal circuit error
• Normal resistor : 10KΩ / at 25°C (Unplugged)
• Normal voltage : 2.5Vdc / at 25°C (plugged)
46
65
Cause of error
Check point & Normal condition
Check Point
1. Estimate the resistance of each sensor.(Unplugged)
2. Estimate the voltage of each sensor.(Plugged)
3. If the resistance of the sensor is 0 kΩ or ∞, then sensor is abnormal.
Ω
If the voltage of the sensor is 0 V or 5Vdc, then sensor is abnormal.
Copyright ©2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 77 -
LGE Internal Use Only
5. Trouble Shooting
Display
code
Title
51
Over capacity
Cause of error
Check point & Normal condition
• Check the indoor unit capacity.
• Check the combination table.
• Over capacity
Combination
Model
Gross max. capacity
Max. single indoor unit
capacity
A2UW183FA2
28k
12k
A3UW243FA2
36k
A4UW363FA1
A4UW363FA2
55k
18k
Check Point
1. Check the indoor unit capacity.
Copyright ©2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 78 -
LGE Internal Use Only
5. Trouble Shooting
Display
code
60
Title
Cause of error
Check point & Normal condition
1. EEPROM contact defect/wrong insertion
2. Different EEPROM Version
3. ODU Inverter & Main PCB assembly damage
Inverter PCB & Main
EEPROM Access error
EEPROM check sum error and Check SUM error
■ Error Diagnosis and Countermeasure Flow Chart
Is EEPROM insertion normal?
No
1.Check EEPROM insert direction/connection condition
2.Check EEPROM Check SUM
→ Replace if abnormality found
Yes
Is inverter PCB assembly normal?
No
Replace inverter PCB assembly
Yes
MAIN PCB assembly normal?
No
Replace MAIN PCB assembly
Yes
Recheck power and installation condition
Check Point
- Check the EEPROM Check sum & Direction
<EEPROM Direction Check Point>
<MAIN PCB>
Copyright ©2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 79 -
LGE Internal Use Only
5. Trouble Shooting
Display
code
Title
Cause of error
61
Condenser
pipe sensor
temp. high
• Condenser pipe sensor
detected high temp.
Check point & Normal condition
• Check the load condition.
• Check the sensor of Condenser pipe sensor.
Check Point
- Check the install condition for over load.
(Refrigerant, Pipe length, Blocked, …)
Copyright ©2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 80 -
LGE Internal Use Only
5. Trouble Shooting
Display
code
62
Title
Heatsink High error
Cause of error
Check point & Normal condition
Inverter PCB heatsink
temperature is over 85°C
2. ODU fan locking
3. Heatsink assembly of INV PCB assemble condition abnormal
4. Defect of temperature sensing circuit part defect
of INV PCB
■ Error Diagnosis and Countermeasure Flow Chart
Is installation
condition normal ?
No
1. Check fan locking
2. Check covering of heat exchanger
3. Check distance between ODU and obstacles
4. Check pipe distortion and abnormality
5. Check service valve is opened
→ Eliminate causes for abnormal condition
Yes
Is assemble condition
of INV PCB heatsink normal ?
No
Check assemble condition between INV PCB heatsink and
PFC & IPM module → Reassemble if abnormality found
Yes
Is PCB temperature
sensing part normal ?
No
Check resistance between NO.19 pin and NO.20 pin
of PFC module
Check resistance between NO.24 pin and NO.25 pin
of PFC module
→ 7KΩ ±10%(at 25°C)
→ Replace PCB if abnormality found
Check Point
1. Check resistance between No.19 pin and NO.20 pin of PCB PFC module
2. Check resistance between No.24 pin and NO.25 pin of PCB PFC module - only 48/56k
3. Resistance value should be in 7kΩ ±10%.(at 25°C).
PFCM :
Measuring resistance
between No.19,20 pin
Copyright ©2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 81 -
LGE Internal Use Only
5. Trouble Shooting
Display
code
65
Title
Heatsink High error
Cause of error
Inverter PCB heatsink
sensor is open or short
Check point & Normal condition
1. ODU fan locking
2. Heatsink assembly of INV PCB assemble
condition abnormal
3. Defect of temperature sensing circuit part defect
of INV PCB
■ Error Diagnosis and Countermeasure Flow Chart
Is installation
condition normal ?
No
1. Check fan locking
2. Check covering of heat exchanger
3. Check distance between ODU and obstacles
4. Check pipe distortion and abnormality
5. Check service valve is opened
→ Eliminate causes for abnormal condition
Yes
Is assemble condition
of INV PCB heatsink normal ?
No
Check assemble condition between INV PCB heatsink and
PFC & IPM module
→ Reassemble if abnormality found
Yes
Is PCB temperature
sensing part normal ?
No
Check resistance between NO.19 pin and NO.20 pin
of PFC module
Check resistance between NO.24 pin and NO.25 pin
of PFC module
→ 7KΩ ±10%(at 25°C)
→ Replace PCB if abnormality found
Check Point
1. Check resistance between No.19 pin and NO.20 pin of PCB PFC module
2. Check resistance between No.24 pin and NO.25 pin of PCB PFC module - only 48/56k
3. Resistance value should be in 7kΩ ±10%.(at 25°C).
4. Check the PFC Module No.19, 20 and IPM Module No.24, 25 pin soldering condition.
PFCM :
Measuring resistance
between No.19,20 pin
Copyright ©2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 82 -
LGE Internal Use Only
5. Trouble Shooting
Display
code
67
Title
Fan Lock Error
Cause of error
Check point & Normal condition
1. ODU fan locking
Fan RPM is 10RPM or
2. Heatsink assembly of INV PCB assemble condiless for 5 sec. when ODU
tion abnormal
fan starts or 40 RPM or
3. Defect of temperature sensing circuit part defect
less after fan starting.
of INV PCB
■ Error Diagnosis and Countermeasure Flow Chart
Is ODU Fan Motor Assemble
condition normal?
No
Check ODU Fan Motor assemble condition and fan locking
→ Reassemble or replace if abnormality found
No
1. Set the multi tester to diode mode.
2. Check voltage between 1pin and 4pin of Fan Motor
(1±0.2V)
3. Replace Inverter PCB if abnormality found.
Yes
Is ODU Fan Motor normal?
Yes
Is wire connection of
ODU Fan Motor wire normal?
No
Check wiring between OUD fan motor and Inverter PCB
( Check if Hall Senor and Motor output terminal color is
matched)
→ Reassemble if abnormality found
Yes
Is Inverter PCB assembly normal?
No
Replace Inverter PCB assembly
Yes
Recheck power and installation condition
Check Point
1. Check voltage between 1pin and 4pin of Fan Mortor connector (Tester diode mode)
2. Voltage vaule should be in 1V ±0.2V.
Check voltage betwen
1pin and 4pin of fan motor
Fan motor
connector
Tester
<Main PCB>
Copyright ©2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 83 -
LGE Internal Use Only
5. Trouble Shooting
Display
code
73
Title
AC input instant over current error
(Matter of software)
Cause of error
Check point & Normal condition
Inverter PCB input power
current is over 48A(peak)
for 2ms
1. Overload operation (Pipe clogging/Covering/EEV
defect/Ref.overcharge)
2. Compressor damage
(Insulation damage/Motor damage)
3. Input voltage abnormal (L, N)
4. Power line assemble condition abnormal
5. Inverter PCB assembly damage
(input current sensing part)
■ Error Diagnosis and Countermeasure Flow Chart
Is installation
condition normal?
No
Yes
1.Check Pipe clogging/distortion
2.Check Covering (Indoor/Outdoor Unit)
3.Check EEV connector assemble condition/normal operation
4.Check refrigerant pressure
→ Reassemble or manage if abnormality found
No
Check
L~N phase voltage is 220V ± 10%
→ Check connection condition and wiring if power is abnormal
No
1.Check L,N connection condition
2.Check wire disconnection and wiring
→ Reassemble if abnormality found
No
1.Check inverter PCB assembly U,V,W connector connection condition
2.Check wire disconnection and wiring
3.Check compressor terminal connection condition(bad contact)
→ Reassemble if abnormality found
Is input voltage normal?
Yes
Is AC input Wire connection
condition normal?
Yes
Is compressor
Wire connection
condition normal?
Yes
Is inverter PCB assembly
normal?
No
Check inverter PCB assembly IPM normality
→ Replace inverter PCB assembly
Yes
Recheck power and
installation condition
Copyright ©2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 84 -
LGE Internal Use Only
5. Trouble Shooting
N
L
< Main PCB wiring Check Point >
< Input Power Source Check Point >
Copyright ©2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 85 -
LGE Internal Use Only
P/NO : MFL63744402
NOVEMBER, 2010