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.
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 users side. Check the drainage of the indoor unit after the repair. If drainage is faulty the water to enter the room and wet floor.

2. Model Line Up

2.1 Indoor units
Category Type Chassis 2.05 (7) AMNH07GD4L0 [MS07AH N40] 2.64 (9) AMNH09GD4L0 [MS09AH N40] Model names Capacity, kW(kBtu/h) 3.52 (12) AMNH12GD4L0 [MS12AH N40] 5.28 (18) 7.03 (24)

S4 Wall mounted S5

AMNH18GD5L0 [MS18AH N50]

AMNH24GD5L0 [MS24AH N50]

SP1 ART COOL SF
AMNH096AP*1 [MA09AH* NP1]
AMNH126AP*1 [MA12AH* NP1]
AMNH09GAF*1 [MA09AH* NF1]
AMNH12GAF*1 [MA12AH* NF1]
AMNH07GDZ*0 [MC07AH* NZ1]
AMNH09GDU*0 [MC09AH* NU1]
AMNH12GDU*0 [MC12AH* NU1]

ART COOL Mirror

AMNH18GD3*0 [MC18AH* N31]
AMNH24GD3*0 [MC24AH* N31]
AMNH07GDE*1 [MC07AH* NE1]
AMNH09GDE*1 [MC09AH* NE1]
AMNH12GDE*1 [MC12AH* NE1]
AMNH18GD8*1 [MC18AH* N81]
AMNH24GD8*1 [MC24AH* N81]

AMNH09GTCC0 [MT09AH NC1]

AMNH12GTCC0 [MT11AH NC1]

Ceiling cassette 4-way

AMNH09GTEF0 [MT10AH NE1]

AMNH12GTEF0 [MT12AH NE1]

AMNH18GTEF0 [MT18AH NE1]

AMNH24GTHF0 [MT24AH NH0]

* indicates color of panel(B:Blue, C:Cherry, D:Wood, M:Metal, R:Mirror, V:Silver, W:White wood, E:Red, G:Gold, H:White Silver, 1:KISS)
Category Type Chassis Model names Capacity, kW(kBtu/h) 3.52 (12)

2.05 (7) BH

2.64 (9)
5.28 (18) AMNH186BHA0 [MB18AH NH0]
7.03 (24) AMNH246BHA0 [MB24AH NH0]

High static pressure

Low static pressure Ceiling concealed duct
AMNH096BTG0 [MB09AHL NT0]
AMNH126BTG0 [MB12AHL NT0]
AMNH186BTG0 [MB18AHL NT0]
B1 Low static pressure (Slim) B2
AMNH09GB1A0/1 [MB09AHL N10/1]
AMNH12GB1A0/1 [MB12AHL N10/1]
AMNH18GB2A0/1 [MB18AHL N20/1]
AMNH24GB2A0/1 [MB24AHL N20/1]

Built in

AMNH096BPA0 [MB09AHB NP0]
AMNH126BPA0 [MB12AHB NP0]
VE Ceiling & floor VB

AMNH096VEA0 [MV09AH NE0]

AMNH126VEA0 [MV12AH NE0]

AMNH186VBA0 [MV18AH NB0]

AMNH246VBA0 [MV24AH NB0]

2.2 Outdoor units

Heat pump
No. of connectable indoor units Total capacity index of connectable indoor units Power supply

A2UW146FA3 [FM15AH UL3]

kW kBtu/h 6.15 21

A2UW166FA0 [FM17AH UL0]

A2UW166FA1 [FM17AH UL1]

A3UW186FA0 [FM19AH UE0]

Max.3 8.79 30

7.1, 220-240V, 50Hz

Chassis
A3UW216FA3 [FM21AH UE3] A4UW246FA3 [FM25AH UE3] A4UW276FA3 [FM27AH UE3]
Max.3 9.Max.4 11.1, 220-240V, 50Hz 12.0 41

kW kBtu/h

A5UW306FA3 [FM30AH UE3]
Max.5 kW kBtu/h 14.1, 220-240V, 50Hz

A5UW406FA3 [FM38AH UH3]

15.2 52

(1 phase)

Heat Pump
No. of connectable indoor units Number of BD units to be connected Total capacity index of connectable indoor units Power supply

A7UW406FA3 [FM40AH UH3]

Max.7 kW kBtu/h 15.2 52

A8UW486FA3 [FM48AH U33]

Max.8 Max.2 18.1, 220-240V, 50Hz

A9UW566FA3 [FM56AH U33]

Max.9 21.4 73

(3 phase)

A6UW368FA0[FM37AH UE0]

Max.6 kW kBtu/h 13.5 46

A7UW428FA3[FM41AH U33]
Max.7 Max.2 15.3, 380-415V, 50Hz

A8UW488FA3[FM49AH U33]

Max.8 18.2 62

A9UW548FA3[FM57AH U33]

Max.9 Max.3 21.3, 380-415V, 50Hz
2.3 BD(Branch distributor) units
No. of connectable indoor units
Model name Connectable indoor unit capacity kW kBtu/h PMBD3620 2.05~7.03 7~24

Max. 2

PMBD7220 5.28~10.6 18~36 PMBD3630 2.05~7.03 7~24

Max. 3

PMBD7230 5.28~10.6 18~36

Max. 4

PMBD3640 2.05~7.03 7~24

BD unit

- 10 -

3. Nomenclature

3.1 Indoor Unit(Global)

AMN H 07 G D 4 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
B : Blue, C : Cherry, D : Wood, M : Metal, R : Mirror, V : Silver, W : White wood, E : Red, G : Gold, H:White Silver, 1 : KISS
Chassis name Indoor unit type
L : Wall Mounted , A : ART COOL D : ART COOL Mirror, T : Ceiling cassette B : Ceiling concealed duct V : Ceiling & floor

Electrical rating

6 : 1, 220-240V, 50Hz G: 1, 220-240V, 50Hz/60Hz

Cooling/heating capacity

Ex) 7,000 Btu/h '07', 18,000 Btu/h '18'

Model type

H : Heat pump
Indicates that this is multi system indoor unit using R410A

3.2 Outdoor Unit(Global)

A4U W F A 3

A : Basic

Multi type
F : Free joint multi type
6 : 1, 220-240V, 50Hz 8 : 3, 380-415V, 50Hz
Ex) 24,000 Btu/h '24', 48,000 Btu/h '48'
W : DC inverter heat pump
Indicates that this is multi system outdoor unit using R410A Ex) A4U : Connectable max. 4 indoor units A6U : Connectable max. 6 indoor units

- 11 -

3.3 Indoor Unit(Europe)

M C 12 A H B

Color of front panel (MA-, MC- model) B : Blue, C : Cherry, D : Wood, M : Metal, R : Mirror, V : Silver, W : White wood Type of duct indoor (MB- model) No mark : High static pressure model L : Low static pressure model B : Builti in model Model type C : Cooling only, H : Heat pump Type of refrigerant A : R410A Cooling/heating capacity Ex) 7,000 Btu/h '07', 18,000 Btu/h '18' Type of indoor units S : Wall mounted, A : ART COOL, C : ART COOL Mirror B : Ceiling concealed duct T : Ceiling cassette, V : Ceiling & Floor Model type M : Multi type air conditioner

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. 26C intake air temp. 24C intake air temp.< 26C 22C intake air temp. < 24C 18C intake air temp. < 22C intake air temp. < 18C 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+0.5C Compressor OFF Temp. Setting Temp-0.5C In 10-min dehumidification operation, the indoor fan operates with the low airflow speed. Setting Temp. 25C intake air temp. -1C intake air temp. -0.5C intake air temp. 18C

- 23 -

6. Convenience Functions & Controls
6.1 Auto changeover operation
The air conditioner changes the operation mode automatically to keep indoor temperature. When room temperature vary over 2C with respect to setting temperature, air conditioner keeps the room temperature in 2C with respect to setting temperature by auto change mode.
+4C +2C +0.5C SET Temp. -0.5C -2C Cooling operation Heating operation Cooling operation
Switching point Heating thermo off
Cooling thermo off Switching point

- 24 -

I Cooling & heating Opeattions

6.1.1 Cooling Mode

+0.5C. Setting Temp. -0.5C.

Thermo. ON

Thermo OFF
INV. Comp. Frequency Constant Comp.

High Comp. ON

- 30 -

6.5 Child Lock Function
This function prevents children or others from tampering with the control buttons on the unit. It is then controlled by the remote controller. All the buttons on indoor display panel will blocked. The unit will be controlled only by remote controller. The function is used to restrict children to not to use the air conditioner carelessly.(CL is an abbreviated form of Child Lock.)

Function setup

AUTO SWING OPERATION

SET TEMP

FAN SPEED
HI AUTO Heater Preheat MED Defrost Humidify LO JET Filter Out door ZONE 3 4

On Off Set no. Time 01

Cancel

Program

Holiday

PLASMA

1 If you press the preset and minute setup button for 3 seconds at the same time, the operation condition switches to the child lock function and will be indicated as "CL" on the indication monitor. At that time, remote control doesn't switch to the selected mode and "CL" appears on the indication monitor for 3 seconds if you press another button. However, it normally performs the actions of the room temperature indication function and wireless remote control.

Set/Clr Hour Min

Function cancel
1 Press the preset and minute setup button over 3 seconds at the same time. In that case, the child lock function cancels and will be indicated as the previous condition.

6.6 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. over 24C 21~24C below 21C Operating Mode Cooling Healthy Dehumidification Heating Setting temp. 22C 22C 22C High speed Setting speed of indoor fan
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.

6.9 Timer(On/Off)

6.9.1 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.
6.9.2 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.

6.10 Weekly Program

If necessary, an operator can make an On/Off reservation of the product for a period of one week. - On/Off schedule of operation for a period of ONE week. No need to turn the unit On/OFF manually during working days. On/Off time is scheduled in micom of the wired remote control. Operation Time Table (Example)
Setting Temp. On Off Mon Tue Wed Thu Fri 25C OFF Sat Sun

25C 25C

09:00 08:00 09:00 08:00 09:00 12:00 17:00 12:00 12:00 12:00

- 34 -

6.11 Two Thermistor Control
There may be a significant difference between temperature taken at the installed product indoor temperature. Two thermistor control provides option to control temperature by referring any of the two temperatures. With help of the slide switch at the back of the wired remote controller, selection of the thermistor for controlling the unit can be One thermistor is in the Indoor unit & the one is in the LCD wired remote.
I Two Thermistor System 6.11.1 Open the rear cover of the wired remote-controller to set the mode. 6.11.2 Select one of three selectable modes as follows.
Position 1: The room temperature is controlled by the thermistor of the main body. Position 2: The room themperature is controlled by the thermistor of the wired remote-controller, control the temperature according to the position of wired remote-controller. Position 3: The room temperature is controlled by lower temperature between the temperature of main body and of remote-controller sensor.

Tubing connection

3.1.4 Evaluation of the performance Operate unit for 15~20 minutes, then check the system refrigerant charge: 1. Measure the pressure of the gas side service valve. 2. Measure the temperature of the intake and discharge of air. 3. Ensure the difference between the intake temperature and the discharge is more than 8C (Cooling) or reversely (Heating).

Intake temperature

NOTE: Use 2 AAA(1.5volt) batteries. Do not use rechargeable batteries. Remove the batteries from the remote controller if the system is not going to be used for a long time.

Discharge air

3.1.2 Precautions in test run
I The initial power supply must provide at least 90% of the rated voltage. Otherwise, the air conditioner should not be operated. I For test run, carry out the cooling operation firstly even during heating season. If heating operation is carried out firstly, it leads to the trouble of compressor. Then attention must be paid. I Carry out the test run more than 5 minutes without fail. (Test run will be cancelled 18 minutes later automatically) I The forced operation is started by pressing button for 2 seconds. (Cassette Type) The test run is started by pressing button for 5 seconds. (Cassette Type) The test run is started by pressing timer cancel button five times continuously. (Room type) I To cancel the test run, press any button.
Discharge temperature Intake temperature

Discharge temperature

3.1.3 Settlement of outdoor unit I Anchor the outdoor unit with a bolt and nut(10mm) tightly and horizontally on a concrete or rigid mount. I When installing on the wall, roof or rooftop, anchor the mounting base securely with a nail or wire assuming the influence of wind and earthquake. I In the case when the vibration of the unit is conveyed to the hose, secure the unit with an anti-vibration rubber.

- 42 -

3.2 CVT Type
3.2.1 Connection of power supply
1) Connect the power supply cord to the independent power supply. Circuit breaker is required. 2) Prepare the remote control. Insert two batteries provided. Remove the battery cover from the remote controller. Slide the cover according to the arrow direction. Insert the two batteries. (Two "R03" or "AAA" dry-cell batteries or equivalent.) Be sure that the (+) and (-) directions are correct. Be sure that both batteries are new. Re-attach the cover. Slide it back into position. 3) Operate the unit for fifteen minutes or more.
3.2.2 Evaluation of the performance
1) Measure the temperature of the intake and discharge air. 2) Ensure the difference between the intake temperature and the discharge one is more than 8C (Cooling) or reversely (Heating).

Thermometer

3.2.3 Selection of the slide switch according to installation method

Indoor outlet pipe sensor

2.5Vdc

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 10K/ 5K at 25C, then sensor is normal. 4. If the resistance of the sensor is 0 K 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 25C, then sensor is normal. 8. If the resistance of the sensor is 0 or 5Vdc, then sensor is abnormal. Repair or Change the PCB.

- 59 -

Display code 03 Title Communication Wired R/C Cause of error Open / Short Wrong connection Check point & Normal condition Connection of wire Main PCB Volt. DC12V Noise interference

Wired R/C 12V S GND 12V

Indoor Unit S GND

CN-REMO

Check the Volt.
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

- 60 -

Display code Title Cause of error Check point & Normal condition The connection of wire(Drain pump/ Float switch) Drain pump power input. (220V) Drain tube installation. Indoor unit installation. (Inclination)
Drain pump / Float switch
Float switch Open. (Normal : short)

CN Float

CN-D/PUMP CN-Float
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.

- 61 -

6.7 Troubleshooting Outdoor Error
A2UW146FA3/A2UW166FA0/A2UW166FA1/ A3UW186FA0/A3UW216FA3/A4UW246FA3

< Input Power Source Check Point > 27/30/40k

< Main PCB>

<DC Link Voltage Check Point>
<DC_LINK Sensing Check Point>

- 79 -

48/56k

N GND L

<Connection Check Point>

DC_LINK GND

- 80 -
Display code Title Cause of error Check point & Normal condition
Check the connection CN_L/PRESS,H/PRESS Check the components.
I Error diagnosis and countermeasure flow chart
Is high pressure switch connector connected to PCB?* Yes No

Connect securely

Is high pressure switch connector short during off time?** Yes
Replace high pressure switch
Is SVC valve open? Yes Is this error appeared again after reset? Yes Is high pressure more than 2500kPa at manifold gauge? Yes Is high pressure of LGMV similar as at manifold gauge? Yes Check pipe is blocked or not and take measure

Open SVC valve

Re-check momentary problem or not

Replace PCB

Replace high pressure sensor

- 81 -

1. Check the connection of H/press switch 2. Check short or not at the connector of high pressure switch (Normal open) 27/30/40k
< Main PCB : Connection Check Point > 48/56k
< Checking the Press switch >
< Main PCB : Connection Check Point >
< Checking the H/press switch >

- 82 -

Abnormal Input voltage (140Vac , 300Vac)
Is input voltage normal ? Yes Is Inverter PCB Normal? Yes Recheck power and installation condition No Replace inverter PCB assembly No Check L~N Voltage is 220V15%
1. Check the Input Voltage (LN 220V10%) 2. Check Input Voltage Sensor output voltage (2.5Vdc10%)

- 83 -

27/30/40k
< Input Voltage Sensing Check Point >

INPUT(V) GND

- 84 -
Display code Title Cause of error Check point & Normal condition Check the connection of comp wire U,V,W Malfunction of compressor Check the component of IPM, detection parts.

DC Compressor Position

Compressor Starting fail error
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? Yes Is compressor Wire connection condition normal? Yes 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 1. Check resistance between each terminal of compressor (0.188 7%) 2. Check insulation resistance between compressor terminal and pipe (over 50M ) Replace compressor if abnormality found

- 85 -

AC Input Instant over Current Error
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)
Is installation condition normal? Yes 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
No Is input voltage normal?
Check L~N phase voltage is 220V 15% Check connection condition and wiring if power is abnormal
Yes 1.Check L,N connection condition 2.Check wire disconnection and wiring Reassemble if abnormality found
Is AC input Wire connection condition normal? Yes Is compressor Wire connection condition normal? Yes
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 inverter PCB assembly normal? Yes Recheck power and installation condition
No Check inverter PCB assembly PFCM normality Replace inverter PCB assembly
PFCM Moudle checking method Set the multi tester to diode mode. Check short between input signal pin which are placed below PFC Module Replace PCB assembly if it is short between pins except No.4,5 pins.

Signal pin

PFCM module No.4,5 pins are internal short state.

8 - 86 -

Display code Title Cause of error Check point & Normal condition 1. Input voltage abnormal (L~N) 2. ODU inverter PCB damage(DC Link voltage sensing part)

Inverter DC link high voltage error
Inv PCB DC link voltage supplied over 420V
No Is input voltage normal ? Yes Is Inverter PCB assembly Power connection normal? Yes No Is Inverter PCB Normal? Replace inverter PCB assembly No Check connection from terminal block to Inverter PCB assembly CN(L), CN(N) Check L~N Voltage is 220V15%
Recheck power and installation condition

- 87 -

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)

- 88 -

- 89 -
Inverter compressor over current
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
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 1. Check resistance between each terminal of compressor (0.188 7%) 2. Check insulation resistance between compressor terminal and pipe (over 50M ) Replace compressor if abnormality found 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

- 90 -

Display code Title Cause of error Check point & Normal condition Malfunction of current detection circuit. (Open / Short) Check CT Sensor output voltage : 2.5Vdc 5%

C/T Sensor Error

Initial current error
Is input voltage normal ? Yes Is Inverter PCB Normal? Yes Recheck power and installation condition
Check L~N Voltage is 220V15%
Replace inverter PCB assembly

- 91 -

< CT Sensing Check Point >

INPUT(CT) GND

- 92 -
Display code Title Transmission error between (Inverter PCB Main PCB) Cause of error Main controller of Master unit of Master unit cant receive signal from inverter controller Check point & Normal condition 1. Power cable or transmission cable is not connected 2. Defect of outdoor Main fuse/Noise Filter 3. Defect of outdoor Main / inverter PCB

Is transmission LED (Yellow) of inverter compressor PCB on? Yes No Is noise filter or fuse normal? Yes No
Replace noise filter or fuse
Replace inverter compressor PCB
Is transmission cable connected correctly? Yes
No Re-connect transmission cable
No Is MAIN PCB normal? Yes Replace MAIN PCB
- Check the Transmission connector and LED (Main & Inverter)

<Inverter PCB>

<MAIN PCB>

- 93 -

Display code 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
1.Check EEPROM insert direction/connection condition 2.Check EEPROM Check SUM Replace if abnormality found
Is EEPROM insertion normal?
MAIN PCB assembly normal?
Replace MAIN PCB assembly
- Check the EEPROM Check sum & Direction
<EEPROM Direction Check Point>

- 94 -

- 95 -
Display code Title Cause of error Check point & Normal condition 2. ODU fan locking 3. Heatsink assembly of INV PCB assemble condition abnormal 4. Defect of temperature sensing circuit part defect of INV PCB

Heatsink High error

Inverter PCB heatsink temperature is over 85C
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
Is installation condition normal ?
Is assemble condition of INV PCB heatsink normal ?
Check assemble condition between INV PCB heatsink and PFC & IPM module Reassemble if abnormality found
Yes 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 7K 10%(at 25C) Replace PCB if abnormality found
Is PCB temperature sensing part normal ?
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 7k 10%.(at 25C).

- 96 -

PFCM : Measuring resistance between No.19,20 pin
IPM : Measuring resistance between No.24,25 pin

- 97 -

Display code Title Cause of error 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