Fujitsu AR*G12LL, AU*G07LVLA, AR*G14LL, AR*G18LL, AU*G09LVLA Service Instructions Manual

SPLIT TYPE
ROOM AIR CONDITIONER

Models Indoor unit Outdoor unit

AO*G18LAT3
AO*G24LAT3
AO*G30LAT4

INVERTER MULTI

SERVICE

INSTRUCTION

R410A

Universal Floor / Ceiling
Slim Duct / Compact Cassette
Compact Wall Mounted /

Wall Mounted / Floor

AB*G14LVTA
AB*G18LVT *

AR*G07LLTA
AR*G09LLTA
AR*G12LL* *
AR*G14LL* *
AR*G18LL* *

AU*G07LVLA
AU*G09LVLA
AU*G12LVL *
AU*G14LVL *
AU*G18LVL *

AS*G07LJCA
AS*G09LJCA
AS*G12LJCA
AS*G18LFCA
AS*G24LFC *

AS*G07LUCA
AS*G09LUCA
AS*G12LUCA
AS*G14LUCA

AG*G09LVCA
AG*G12LVCA
AG*G14LVCA

AS*G07LMCA
AS*G09LMCA
AS*G12LMCA
AS*G14LMCA

Refer to the combination in the catalogue

CONTENTS

1. DESCRIPTION OF EACH CONTROL OPERATION

1. CAPACITY CONTROL................................................................................................

3. INDOOR FAN CONTROL...........................................................................................

2. AUTO CHANGEOVER OPERATION..........................................................................

5. OUTDOOR FAN CONTROL.......................................................................................

4. LOUVER CONTROL...................................................................................................

7. COMPRESSOR CONTROL.......................................................................................

6. TIMER OPERATION CONTROL................................................................................

9. TEST OPERATION CONTROL..................................................................................

8. ELECTRONIC EXPANSION VALVE CONTROL........................................................

11. 4-WAY VALVE EXTENSION SELECT.......................................................................

10. PREVENT TO RESTART FOR 3 MINUTES ( 3 MINUTES ST )................................

13. MANUAL AUTO OPERATION...................................................................................

12. AUTO RESTART........................................................................................................

18. FRESH AIR CONTROL..............................................................................................

14. COMPRESSOR PREHEATING..................................................................................

21.

DEFROST OPERATION CONTROL..........................................................................

19. EXTERNAL ELECTRICAL HEATER CONTROL........................................................

22. VARIOUS PROTECTIONS.........................................................................................

01-01
01-01
01-03
01-11
01-17
01-18
01-21
01-22
01-22
01-22
01-23

01-23
01-24

01-25
01-25

01-27

20.

DRAIN PUMP OPERATION....................................................................................... 01-26

01-30

01-23

2-1-2 WIRED REMOTE CONTROLLER DISPLAY......................................................

2-1-1 INDOOR UNIT DISPLAY....................................................................................

2-1 ERROR DISPLAY......................................................................................................

2. TROUBLE SHOOTING

2-2 TROUBLE SHOOTING WITH ERROR CODE..........................................................

2-3 TROUBLE SHOOTING WITH NO ERROR CODE....................................................

2-4 SERVICE PARTS INFORMATION............................................................................

02-01
02-01
02-02

2-1-3 OUTDOOR UNIT DISPLAY.................................................................................

02-03

02-34

02-04

02-39

3. REPLACEMENT PARTS

15. POWERFUL OPERATION......................................................................................... 01-24

16. 10°C HEAT OPERATION........................................................................................... 01-24

17. ECONOMY OPERATION........................................................................................... 01-24

1 . DESCRIPTION OF EACH
CONTROL OPERATION

R410A

INVERTER (MULTI )

Universal Floor / Celling
Slim Duct / Compact Cassette
Compact Wall Mounted /
Wall Mounted / Floor type

2. AUTO CHANGEOVER OPERATION

01-01

1. CAPACITY CONTROL

Compressor frequency decides by capacity of an indoor unit, operation number of an indoor unit,
set temperature, room temperature and outside temperature.

When the air conditioner is set to the Auto mode by remote controller, operation starts in the optimum
mode from among the Heating, Cooling, Dry and Monitoring mode. During operation, the
optimum mode is automatically switched in accordance with temperature changes. The temperature
can be set between 18°C and 30°C in 1°C steps.

When operation starts, indoor fan and outdoor fan are operated for around 3 minutes.
Room temperature and outdoor temperature are sensed,
and the operation mode is selected in accordance with the table below. <Monitoring mode>

Cooling mode

25°C

Heating mode

( Table 1 : Operation mode selection table )

Room temperature (TR)

TR> Ts + 2°C

Ts + 2°C TR Ts - 2°C

*Middle zone

TR < Ts - 2°C Heating

When Cooling or Dry mode was selected at and air flow mode is Auto, the air conditioner operates as follow.

The same operation as COOLING OPERATION AND DRY OPERATION.
When the room temperature has remained at set temperature -1.5°C,
operation is automatically switched to Dry mode.
If the room temperature reaches set temperature +2°C during Dry mode, operation returns to Cooling.

1

1

2

( Fig. 1 : Outdoor temperature zone selection )

Cooling

(Autmatic dry)

Operation mode

*If it's Middle zone, operation mode of indoor unit is selected as below.

(1). Same operation mode is selected as outdoor unit.

If outdoor unit is operating in Cooling, Dry, and Heating mode,
indoor unit will be operated by the same operation mode.

(2). Selected by the outdoor temperature.

If outdoor unit is operating in other than Cooling, Dry, and Heating mode,
indoor unit will be operated according to the outdoor temperature as below.

Cooling

Cooling

Dry(X zone)

Dry(J zone)

Compressor stop

When the room
temperature drops

When the room
temperature rises

Ts + 2°C

Ts - 0.5°C

Ts - 1.5°C

Ts + 1°C

Ts - 1.5°C

Ts - 2.5°C

( Fig.2 : Auto changeover : Cooling - Dry )

TR : Room temperature
Ts : Setting temperature

TR : Room temperature
Ts : Setting temperature

( Air flow mode : Auto )

01-02

START

Room temp.

Ts + 2

°C?

COOLING (AUTO:DRY)

OPERATION

HEATING OPERATION

YES

YES

NO

NO

NO

AUTO CHANGEOVER operation flow chart

TS : Setting temperature

Room temp.

Ts - 2

°C?

Thermostat remains

in OFF state for 6 minutes or

longer?

System stops

or operation command other than

auto changeover operation?

NO

Thermostat remains

in OFF state for 6 minutes or

longer?

System stops

or operation command other than

auto changeover operation?

Middle zone

NO

Operation mode

of outdoor unit : Cooling or Dry?

YES

NO

Operation mode

of outdoor unit : Heating?

YES

NO

YES

Outdoor temperature

25°C?

NO

YES

YES

NO

YES

YES

When Heating was selected at , the same operation as HEATING OPERATION of page
01-02 is performed.

When the compressor was stopped for 6 consecutive minutes by the temperature control function
after the Cooling(Auto:Dry) or Heating mode was selected at above, operation is switched
to Monitoring and the operation mode is selected again.

3

1

4

1

3. INDOOR FAN CONTROL

01-03

1. Fan speed

(Table 2 : Indoor fan speed table)

AS*G07LJCA AS*G09LJCA

AS*G12LJCA

AS*G18LFCA

AS*G24LFC*

AU*G07LVLA

*Note, during Economy operation and operation mode is Fan, air flow is 1 step downs.
(Hi > Me, Me > Lo, Quiet > Soft Quiet)

(rpm)

(rpm)

(rpm) (rpm)

(rpm)

(rpm)

Hi

Me+

Me

Lo

Quiet

Cool Air Prevention

S-Lo

Hi

Me

Lo

Quiet

*Soft Quiet

Auto

Operation mode

Heating

Cooling / Fan

Dry

Air flow mode

Fan Speed

1050
1000

950
850
710
600
480

1050

950
850
680
600

X, J zone:680

Hi

Me+

Me

Lo

Quiet

Cool Air Prevention

S-Lo

Hi

Me

Lo

Quiet

*Soft Quiet

Auto

Operation mode

Heating

Cooling / Fan

Dry

Air flow mode

Fan Speed

1100
1040

980
850
710
600
480

1100

980
850
680
600

X, J zone:680

Hi

Me+

Me

Lo

Quiet

Cool Air Prevention

S-Lo

Hi

Me

Lo

Quiet

*Soft Quiet

Auto

Operation mode

Heating

Cooling / Fan

Dry

Air flow mode

Fan Speed

1200
1130
1050

910
710
600

480
1200
1050

880

680

600

X, J zone:680

Hi

Me+

Me

Lo

Quiet

Cool Air Prevention

S-Lo

Hi

Me

Lo

Quiet

*Soft Quiet

Auto

Operation mode

Heating

Cooling / Fan

Dry

Air flow mode

Fan Speed

1220
1120
1020

900
710
660

480
1220
1020

900

710

660

X, J zone:710

Hi

Me+

Me

Lo

Quiet

Cool Air Prevention

S-Lo

Hi

Me

Lo

Quiet

*Soft Quiet

Auto

Operation mode

Heating

Cooling / Fan

Dry

Air flow mode

Fan Speed

1430
1320
1220
1020

900
720

480
1480
1220
1020

900

720

X, J zone:900

Hi

Me+

Me

Lo

Quiet

Cool Air Prevention

S-Lo

Hi

Me

Lo

Quiet

*Soft Quiet

Auto

Operation mode

Heating

Cooling / Fan

Dry

Air flow mode

Fan Speed

590
570
540
490
440
400
300
590
540
490
440
400

X, J zone:440

AR*G09LL*A (Static pressure:25Pa)

Hi

Me

Lo

Quiet

S-Lo

Hi

Me

Lo

Quiet

*Soft Quiet

Auto

Operation mode

Heating

Cooling / Fan

Dry

Air flow mode

Fan Speed

X, J zone:960

1260
1160
1060

960

500
1260
1160
1060

960

500

AU*G12LVL*

Hi

Me+

Me

Lo

Quiet

Cool Air Prevention

S-Lo

Hi

Me

Lo

Quiet

*Soft Quiet

Auto

Operation mode

Heating

Cooling / Fan

Dry

Air flow mode

Fan Speed

650
620
580
520
460
400
300
660
580
520
460
400

X, J zone:460

01-04

Hi

Me+

Me

Lo

Quiet

Cool Air Prevention

S-Lo

Hi

Me

Lo

Quiet

*Soft Quiet

Auto

Operation mode

Heating

Cooling / Fan

Dry

Air flow mode

Fan Speed

AU*G09LVLA

590
570
540
490
440
400
300
590
540
490
440
400

X, J zone:440

AU*G14LVLA

Hi

Me+

Me

Lo

Quiet

Cool Air Prevention

S-Lo

Hi

Me

Lo

Quiet

*Soft Quiet

Auto

Operation mode

Heating

Cooling / Fan

Dry

Air flow mode

Fan Speed

X, J zone:460

740
700
670
600
480
400
300
730
630
540
460
400

AU*G18LVLA

Hi

Me+

Me

Lo

Quiet

Cool Air Prevention

S-Lo

Hi

Me

Lo

Quiet

*Soft Quiet

Auto

Operation mode

Heating

Cooling / Fan

Dry

Air flow mode

Fan Speed

X, J zone:460

840
800
750
650
500
400
300
790
660
570
460
400

AR*G07LL*A (Static pressure:25Pa)

Hi

Me

Lo

Quiet

S-Lo

Hi

Me

Lo

Quiet

*Soft Quiet

Auto

Operation mode

Heating

Cooling / Fan

Dry

Air flow mode

Fan Speed

X, J zone:880

1160
1000

940
880

500
1160
1000

940

880

500

(rpm)

(rpm)

(rpm)

(rpm)

(rpm)(rpm)

*Note, during Economy operation and operation mode is Fan, air flow is 1 step downs.
(Hi > Me, Me > Lo, Quiet > Soft Quiet)

AR*G12LL** (Static pressure:25Pa)

Hi

Me

Lo

Quiet

S-Lo

Hi

Me

Lo

Quiet

*Soft Quiet

Auto

Operation mode

Heating

Cooling / Fan

Dry

Air flow mode

Fan Speed

X, J zone:1030

1340
1240
1140
1030

500
1340
1240
1140
1030

500

AR*G18LL** (Static pressure:25Pa)

Hi

Me

Lo

Quiet

S-Lo

Hi

Me

Lo

Quiet

*Soft Quiet

Auto

Operation mode

Heating

Cooling / Fan

Dry

Air flow mode

Fan Speed

1380
1300
1220
1140

600
1380
1300
1220
1140

600

X, J zone:1140

01-05

AR*G14LL** (Static pressure:25Pa)

Hi

Me

Lo

Quiet

S-Lo

Hi

Me

Lo

Quiet

Soft Quiet

Auto

Operation mode

Heating

Cooling / Fan

Dry

Air flow mode

Fan Speed

X, J zone:1030

1560
1400
1240
1030

500
1560
1400
1240
1030

500

AB*G14LVTA

Hi

Me+

Me

Lo

Quiet

Cool Air Prevention

S-Lo

Hi

Me

Lo

Quiet

*Soft Quiet

Auto

Operation mode

Heating

Cooling / Fan

Dry

Air flow mode

Fan Speed

X, J zone:670

850
850
800
740
670
500
300
850
800
740
670
500

AB*G18LVTA

Hi

Me+

Me

Lo

Quiet

Cool Air Prevention

S-Lo

Hi

Me

Lo

Quiet

*Soft Quiet

Auto

Operation mode

Heating

Cooling / Fan

Dry

Air flow mode

Fan Speed

X, J zone:740

1040

1000

950
800
740
500
300

1040

950
800
740
500

(rpm) (rpm)

(rpm)

(rpm)

(rpm)

*Note, during Economy operation and operation mode is Fan, air flow is 1 step downs.
(Hi > Me, Me > Lo, Quiet > Soft Quiet)

01-06

AG*G09LVCA

Hi

Me

Lo

Quiet

Cool Air Prevention

S-Lo

Hi

Me

Lo

Quiet

Soft Quiet

Auto

Operation mode

Heating

Cooling / Fan

Dry

Air flow mode

Fan Speed

1120/950
1000/850

860/730
660/560
660/560
660/560

1120/950

960/820
820/700
660/560
570/480

-

Upper / Lower
Upper / Lower
Upper / Lower
Upper / Lower
Upper / Lower
Upper / Lower
Upper / Lower
Upper / Lower
Upper / Lower
Upper / Lower
Upper / Lower
Upper / Lower

1230
1090

940
750
680

680
1230
1070

910

750

680

X, J zone:750

Upper & Lower

air flow mode

Upper

air flow mode

AG*G12LVCA

Hi

Me

Lo

Quiet

Cool Air Prevention

S-Lo

Hi

Me

Lo

Quiet

Soft Quiet

Auto

Operation mode

Heating

Cooling / Fan

Dry

Air flow mode

Fan Speed

1240/1040

1080/920

910/770
660/560
660/560
660/560

1240/1040

1050/890

860/730
660/560
570/480

-

Upper / Lower
Upper / Lower
Upper / Lower
Upper / Lower
Upper / Lower
Upper / Lower
Upper / Lower
Upper / Lower
Upper / Lower
Upper / Lower
Upper / Lower
Upper / Lower

1300
1140

980

750

680

680
1300
1120

930

750

680

X, J zone:750

Upper & Lower

air flow mode

Upper

air flow mode

AG*G14LVCA

Hi

Me

Lo

Quiet

Cool Air Prevention

S-Lo

Hi

Me

Lo

Quiet

Soft Quiet

Auto

Operation mode

Heating

Cooling / Fan

Dry

Air flow mode

Fan Speed

1330/1120

1140/970

940/800
660/560
660/560
660/560

1330/1120

1100/930

890/750
660/560
570/480

-

Upper / Lower
Upper / Lower
Upper / Lower
Upper / Lower
Upper / Lower
Upper / Lower
Upper / Lower
Upper / Lower
Upper / Lower
Upper / Lower
Upper / Lower
Upper / Lower

1370
1180
1020

750

680

680
1370
1160

960

750

680

X, J zone:750

Upper & Lower

air flow mode

Upper

air flow mode

(rpm)

(rpm)

(rpm)

01-07

AS*G07LUCA AS*G09LUCA

AS*G12LUCA

AS*G14LUCA

*Note, during Economy operation and operation mode is Fan, air flow is 1 step downs.
(Hi > Me, Me > Lo, Quiet > Soft Quiet)

(rpm)

(rpm)

(rpm) (rpm)

Powerful

Hi

Me+

Me

Lo

Quiet

Cool Air Prevention

S-Lo

Powerful

Hi

Me

Lo

Quiet

*Soft Quiet

Auto

Operation mode

Heating

Cooling / Fan

Dry

Air flow mode

Fan Speed

1030

980
980
910
850
650
610
570

1030

980
910
850
650
610

X, J zone:650

Powerful

Hi

Me+

Me

Lo

Quiet

Cool Air Prevention

S-Lo

Powerful

Hi

Me

Lo

Quiet

*Soft Quiet

Auto

Operation mode

Heating

Cooling / Fan

Dry

Air flow mode

Fan Speed

1050
1030
1030

950
850
650
610

570
1080
1030

950

850

650

610

X, J zone:650

Powerful

Hi

Me+

Me

Lo

Quiet

Cool Air Prevention

S-Lo

Powerful

Hi

Me

Lo

Quiet

*Soft Quiet

Auto

Operation mode

Heating

Cooling / Fan

Dry

Air flow mode

Fan Speed

1160
1110
1110
1030

930
650
610

570
1160
1110
1030

930

650

610

X, J zone:650

Powerful

Hi

Me+

Me

Lo

Quiet

Cool Air Prevention

S-Lo

Powerful

Hi

Me

Lo

Quiet

*Soft Quiet

Auto

Operation mode

Heating

Cooling / Fan

Dry

Air flow mode

Fan Speed

1230
1180
1180
1080
1010

790
610

570
1230
1180
1080

980

740

710

X, J zone:740

01-07+1

AS*G07LMCA AS*G09LMCA

AS*G12LMCA

AS*G14LMCA

*Note, during Economy operation and operation mode is Fan, air flow is 1 step downs.

(Hi > Me, Me > Lo, Quiet > Soft Quiet)

(rpm)

(rpm)

(rpm) (rpm)

Powerful

Hi

Me+

Me

Lo

Quiet

Cool Air Prevention

S-Lo

Powerful

Hi

Me

Lo

Quiet

*Soft Quiet

Auto

Operation mode

Heating

Cooling / Fan

Dry

Air flow mode

Fan Speed

1090
1050
1000

950
850
710
600

480
1090
1050

950

850

680

600

X, J zone:680

Powerful

Hi

Me+

Me

Lo

Quiet

Cool Air Prevention

S-Lo

Powerful

Hi

Me

Lo

Quiet

*Soft Quiet

Auto

Operation mode

Heating

Cooling / Fan

Dry

Air flow mode

Fan Speed

1140
1090
1040

980
850
710
600

480
1140
1090

980

850

680

600

X, J zone:680

Powerful

Hi

Me+

Me

Lo

Quiet

Cool Air Prevention

S-Lo

Powerful

Hi

Me

Lo

Quiet

*Soft Quiet

Auto

Operation mode

Heating

Cooling / Fan

Dry

Air flow mode

Fan Speed

1240
1190
1120
1050

910
710
600

480
1240
1190
1050

880

680

600

X, J zone:680

Powerful

Hi

Me+

Me

Lo

Quiet

Cool Air Prevention

S-Lo

Powerful

Hi

Me

Lo

Quiet

*Soft Quiet

Auto

Operation mode

Heating

Cooling / Fan

Dry

Air flow mode

Fan Speed

1240
1190
1120
1050

910
710
600

480
1240
1190
1050

880

680

600

X, J zone:680

The airflow can be switched in 5 steps such as Auto, Quiet, Lo, Me, Hi,
while the indoor fan only runs.
When Fan mode is set at (Auto), it operates on (Me) Fan Speed.

2. FAN OPERATION

3. COOLING OPERATION (Auto : Cooling)

Switch the airflow [Auto], and the indoor fan motor will run according to a room temperature,
as shown in Fig 3.
On the other hand, if switched in [Hi] [Quiet], the indoor motor will run at a constant airflow of [Cooling]
operation modes Quiet, Lo, Me, Hi.

( Fig.3 : Airflow change - over (Cooling : Auto) )

When the room
temperature rises

When the room
temperature drops

TR : Room temperature
Ts : Setting temperature

TR-Ts > +2°C

=

+1°C > TR-Ts

+2°C > TR-Ts > +1°C

=

TR-Ts >

+2.5°C

=

+1.5°C > TR-Ts

+2.5°C) > TR-Ts > +1.5°C

=

Hi

Me

Lo

=

=

=

=

4. DRY OPERATION (Auto : Dry)

During the dry operation, the fan speed setting can not be changed,it operates automatically as shown in Fig. 4.
Room temperature variation which the room temperature sensor of the indoor unit body has detected.

( Fig. 4 : Indoor fan control )

10 30 60 180 60 180 60 10 30 (sec)

Fan OFF

OFF

< Compressor >

ON

Setting air flow

S-Lo

< Indoor fan air flow mode >

< All models >

< All models >

01-08

3-1 INDOOR UNIT FAN CONTROL FOR ENERGY SAVING (Cooling mode)

Switch the airflow at cooling mode, and the indoor fan motor will run as shown in Fig.4.

It depends on the Function setting "Indoor unit fan control for energy saving."

The maximum value of the indoor fan speed is set as shown in Fig 6, based on the detected
temperature by the indoor heat exchanger sensor in heating mode.
Field setting is necessary at AR and AU type as "Cool air prevention : effective".

< AS*G type >

01-09

5. HEATING OPERATION (Auto : Heating)

Switch the airflow [Auto], and the indoor fan will run according to a room temperature,
as shown in Fig 5.
On the other hand, if switched in [Hi] [Quiet], the indoor fan will run at a constant airflow
of [Heat] operation modes Quiet, Lo, Me, Hi, as shown in Table 2.

6. COOL AIR PREVENTION CONTROL (For Heating and 10°C heat operation)

( Fig.5 : Airflow change - over (Heating : Auto) )

TR-Ts > -1.5°C

=

-2.5°C > TR-Ts

-1.5°C > TR-Ts > -2.5°C

=

TR-Ts > -1°C

=

-2°C > TR-Ts

-1°C > TR-Ts > -2°C

=

When the room
temperature rises

When the room
temperature drops

TR : Room temperature
Ts : Setting temperature

Lo

Me

Me+

42°C

30°C

34°C

When Indoor heat exchanger
temperature rises

When Indoor heat exchanger
temperature drops

Hi

*Me+ or setting

FAN mode

Cool air
prevention

39°C

37°C

37°C

32°C

28°C

S-Lo

*Lo or setting

FAN mode

29°C

When Indoor heat exchanger
temperature rises

When Indoor heat exchanger
temperature drops

*Lo or setting

FAN mode

37°C

32°C

24°C

*Hi or setting

FAN mode

S-Lo

During NORMAL HEATING OPERATION

< AR*G type >

*Lower speed is selected

TR-Ts > -1.5°C

=

-2.5°C > TR-Ts

-1.5°C> TR-Ts > -2.5°C

=

TR-Ts > -1°C

=

-2°C > TR-Ts

-1°C > TR-Ts > -2°C

=

When the room
temperature rises

When the room
temperature drops

Lo

Me

Hi

< AU*G / AR*G / AB*G / AG*G type >

< AS*G type >

( Fig.6 : Airflow change - over for cool air prevention)

*Lower speed is selected

01-10

34°C

When Indoor heat exchanger
temperature rises

When Indoor heat exchanger
temperature drops

Lo

39°C

Auto

When Indoor
heat exchanger
temperature rises

When Indoor heat exchanger
temperature drops

Lo

Auto

32°C

37°C

During 10°C HEAT OPERATION

< AS*G / AU*G / AB*G type >

< AR*G type >

< AB*G / AU*G type >

42°C

30°C

34°C

When Indoor heat exchanger
temperature rises

When Indoor heat exchanger
temperature drops

Hi

*Me+ or setting

FAN mode

Cool air
prevention

39°C

37°C

37°C

32°C

24°C

S-Lo

*Lo or setting

FAN mode

< AG*G type >

*Lower speed is selected

42°C

30°C

31°C

When Indoor heat exchanger
temperature rises

When Indoor heat exchanger
temperature drops

Hi

*Me or setting

FAN mode

Cool air
prevention

39°C

37°C

34°C

29°C

24°C

S-Lo

*Lo or setting

FAN mode

*Lower speed is selected

31°C

When Indoor heat exchanger
temperature rises

When Indoor heat exchanger
temperature drops

Lo

39°C

Auto

< AG*G type >

4. LOUVER CONTROL

Each time the button is pressed, the air direction range will change as follow:

(Function Range)

(Table9 : Recommended Operation Range)

01-11

Use the air direction adjustments within the ranges shown above.

The vertical airflow direction is set automatically as shown, in accordance with the type of operation selected.

Cooling / Dry mode : Horizontal flow
Heating mode : Downward flow AS*G07/09/12LJCA : , AS*G18/24LFCA :

When the temperature of the air being blown out is low at the start of heating operation or during
defrosting, the airflow direction temporarily becomes to prevent cold air being blown onto the body.

During use of the Cooling and Dry modes, do not set the Air Flow Direction Louver in the Heating
range ( ) for long period of time, since water vapor many condense near the outlet louvers and
drop of water may drip from the air conditioner. During the Cooling and Dry modes, if the Air Flow
Direction Louvers are left in the heating range for around 30 minutes, they will automatically
return to position .

(Fig.7 : Virtical Air Direction Range)

Cooling / Heating / Dry mode / Fan mode

Cooling / Dry / Fan mode( ) :
Heating / Fan mode( ) : AS*G07/09/12LJCA [ ], AS*G18/24LFCA [ ]

3. SWING OPERATION

When the swing signal is received from the remote controller, the vertical louver starts to swing.

(Swinging Range)

1 3

1

4

4

6

6

Vertical Airflow Swing Operation

Horizontal Airflow Swing Operation ( For AS*G18/24LFCA )

When the swing signal is received from the remote controller, the horizontal louver starts to swing.

Cooling / Heating / Dry / Fan mode :

(Swinging Range)

5

1

Vertical and Horizontal Airflow Swing Operation

When the indoor fan is S-Lo or Stop mode, the swing operation is interrupted
and it stops at either upper end or bottom end.

When the indoor fan is S-Lo or Stop mode, the swing operation is interrupted
and it stops at either upper end or bottom end.

When the horizontal swing signal is input from remote control, the combination of the vertical
and horizontal swing operation is performed.

1

2

3

4

5

2. HORIZONTAL LOUVER CONTROL ( For AS*G18/24LFCA )

Horizontal Louver

Each time the button is pressed, the air directionrange will change as follows.

(Function Range)

Cooling / Heating / Dry / Fan mode

(Fig.8 : Horizontal Air Direction Range)

Power Diffuser doesn't swing in any swing operation.

For Compact Wall Mounted Type, Wall Mounted Type < AS*G07/09/12LJCA,18/24LFCA >

1. VERTICAL LOUVER CONTROL

Power DiffuserVertical Louver

Vertical Louver

<Wall Mounted Type><Compact Wall Mounted Type>

36

4

1. VERTICAL LOUVER CONTROL

3. SWING OPERATION

Each time the button is pressed, the air direction range will change as follow:

(Function Range)

01-12

The vertical airflow direction is set automatically as shown, in accordance with the type of operation selected.

Cooling / Dry mode

Horizontal flow

Heating mode Downward flow

When the swing signal is received from the remote controller, the vertical louver starts to swing.

(Table9 : Swinging Range)

(Fig.9 : Air Direction Range)

Cooling / Dry mode
Fan mode ( )

Types of Air flow Direction Setting:

, , : During Cooling/Dry modes
, , , : During Heating

The Remote Controller's display does not change.

Use the air direction adjustments within the ranges shown above.

During AUTO mode operation, for the first a few minutes after beginning operation,
air-flow will be horizontal 1; the air direction cannot be adjusted during this period.
The air flow direction setting will temporarily become 1 when the temperature of the air -flow is
low at the start of the Heating mode.

Range

Heating mode
Fan

m

ode ( )

The SWING operation may stop temporarily when the air conditioner’s fan is not operating,
or when operating at very low speeds.

1
2
3
4
5
6
7

2. ADJUST THE RIGHT-LEFT LOUVERS

Move the Right-Left louvers to adjust air flow in the direction you prefer.

Knob (2 places)

Right-Left Louvers

Knob

To select Vertical Airflow Swing Operation

To select Horizontal Airflow Swing Operation

(No function)

For Wall Mounted Type < AS*G07/09/12/14LUCA >

1. VERTICAL LOUVER CONTROL

2. SWING OPERATION

Each time the button is pressed, the air direction range will change as follow:

(Function Range)

01-12+1

The vertical airflow direction is set automatically as shown, in accordance with the type of operation selected.

Cooling / Dry mode

Horizontal flow

Heating mode Downward flow

When the swing signal is received from the remote controller, the vertical louver starts to swing.

(Table11 : Swinging Range)

Air Direction RangeFig.9 :

Cooling / Dry mode
Fan mode ( )

The Remote Controller's display does not change.

Use the air direction adjustments within the ranges shown above.

If you set the angle to position 4.7 for more than 30 minutes in COOL or
DRY mode, they automatically return to position 3.
In COOL or DRY mode, if the angle is set to position 4.7 for many hours,
condensation may be formed, and the drips may wet your property.

During AUTO or Heating mode operation, for the first a few minutes after beginning operation,
air-flow will be horizontal 1; the air direction cannot be adjusted during this period.
The air flow direction setting will temporarily become 1 when the temperature of the air -flow is
low at the start of the Heating mode.

Range

Heating mode
Fan mode ( )

The SWING operation may stop temporarily when the air conditioner’s fan is not operating,
or when operating at very low speeds.

2. ADJUST THE RIGHT-LEFT LOUVER S

Move the Right-Left louvers to adjust air flow
in the direction you prefer.

To select Vertical Airflow Swing Operation

To select Horizontal Airflow Swing Operation

(No function)

Right-Left Louvers

1

2

3

4

5

6

7

Knob

For Wall Mounted Type < AS*G07/09/12/14LMCA >

01-13

1. VERTICAL LOUVER CONTROL

Each time the button is pressed, the air direction range will change as follows:

Use the air direction adjustments within the ranges shown above.

The vertical airflow direction is set automatically as shown, in accordance with the type of operation selected.

(Function Range)

(Fig.10 : Air Direction Range)

(Operation Range)

Cooling / Heating / Dry / Fan mode :

Cooling / Dry / Fan mode

Horizontal flow

Heating mode

Downward flow

2. SWING OPERATION

When the swing signal is received from the remote controller, the vertical louver starts to swing.
The range of swing depends on the set airflow direction.

When the indoor fan is either at S-Lo or Stop mode, the swinging operation is interrupted
and it stops at either upper end or bottom end.
( Stop mode means Operation stop.)

During AUTO mode operation, for the first minute after start-up, air-flow will be horizontal
; the air direction cannot be adjusted during this period.

For Compact Cassette Type < AU*G07/09/12/14/18 >

1234

1234

1

14

4

1

2

3

4

(Swinging Range)

Cooling / Heating / Dry / Fan mode :

01-14

( Fig.11 : Air Direction Range : Ceiling installation)

For Floor / Ceiling Type < AB*G14/18 >

1-1. VERTICAL LOUVER CONTROL

Each time the button is pressed, the air direction range will
change as follows:

Use the air direction adjustments within the ranges shown above.
The vertical airflow direction is set automatically as shown, in accordance with the type of operation selected.

Cooling / Dry / Fan mode

Horizontal flow

Heating mode

Downward flow

(Function Range)

(Operation Range)

1-2. SWING OPERATION

When the swing signal is received from the remote controller, the vertical louver starts to swing.
The range of swing depends on the set airflow direction.

When the indoor fan is either at S-Lo or Stop mode, the swinging operation is interrupted
and it stops at either upper end or bottom end.

The indoor fan motor starts after the louver reaches to the setting position.

( Stop mode means Operation stop.)

1

4

5

6

7

3

2

1234567

1234567

1
7

(Swinging Range)

7

Cooling / Dry / Fan mode
Heating mode

6

7

( Fig.12 : Air Direction Range : Floor installation)

Cooling / Heating / Dry / Fan mode :

2-1. HORIZONTAL LOUVER CONTROL

Each time the button is pressed, the air direction range will
change as follows:

Cooling / Heating / Dry / Fan mode :

Use the air direction adjustments within the ranges shown above.

(Function Range)

(

Fig.13 : Air Direction Range : Ceiling installation)

(Operation Range)

2-2. SWING OPERATION

When the swing signal is received from the remote controller, the horizontal louver starts to swing.
The range of swing depends on the set airflow direction.

When the indoor fan is either at S-Lo or Stop mode, the swinging operation is interrupted
and it stops at either upper end or bottom end.

01-15

( Stop mode means Operation stop.)

12345

12345

1

3

4

5

2

(Swinging Range)

Cooling / Heating / Dry / Fan mode

5

12 3 45

( Fig.14 : Air Direction Range : Floor installation)

01-16

For Floor Type < AG*G09/12/14 >

1. VERTICAL LOUVER CONTROL

2. SWING OPERATION

Each time the button is pressed,
the air direction range will change as follows:

Use the air direction adjustments within the ranges shown above.

The vertical airflow direction is set automatically as shown, in accordance with the type of operation selected.

Cooling / Dry / Fan mode

Horizontal flow

Heating mode

Downward flow

When the temperature of the air being blown out is low at the start of heating operation or during
defrosting, the airflow direction temporarily becomes to prevent cold air being blown onto the body.

During Monitor operation in AUTO CHANGEOVER mode, the airflow direction automatically
becomes , and it cannot be adjusted.

(Function and Operation Range)

When the swing signal is received from the remote controller, the vertical louver starts to swing .

(Swinging Range)

When the indoor fan is either at S-Lo or Stop mode, the swinging operation is interrrupted

and it stops at either upper end or bottom end.

( Fig.15 : Air Direction Range)

Cooling / Heating / Dry / Fan mode :

5. OUTDOOR FAN CONTROL

Following table 3 shows the fan speed of the outdoor unit.

01-17

1. Outdoor Fan Motor

*

It runs at 500rpm for 20 seconds after starting up the outdoor fan.

When the outdoor heat exchanger temperature is lower than 1°C,
the fan speed switches to 780rpm on heating mode.

When the outdoor heat exchanger temperature is lower than 2°C,
the fan speed switches to 850rpm on heating mode.

( Table 3 : Fan speed of the outdoor unit )

780/ 730/ 400/ 300/ 250/ 200 rpm

780/ 730/ 660/ 400/ 300/ 250/ 200 rpm

Cooling

Heating

AO*G18LAT3

AO*G18/ 24LAT3

AO*G30LAT4

AO*G30LAT4

850/ 820/ 780/ 400/ 300/ 200 rpm

850/ 780/ 400/ 300/ 200 rpm

AO*G24LAT3

6. TIMER OPEARTION CONTROL

1. ON / OFF TIMER

The table 4 shows the available timer setting based on the product model.

OFF timer : When the clock reaches the set time, the air conditioner will be turned off.

Operation mode

Stop mode

Set time of timer

ON timer : When the clock reaches the set time, the air conditioner will be turned on.

Operation mode

Stop mode

Set time of timer

The program timer allows the OFF timer and ON timer to be used in combination one time.

Operation mode

Operation will start from the timer setting (either OFF timer or ON timer) whichever is closest
to the clock's current timer setting.
The order of operations is indicated by the arrow in the remote control unit's display.

SLEEP timer operation cannot be combined with ON timer operation.

2. PROGRAM TIMER

Stop mode

Stop mode

Stop mode

Operation mode

Operation mode

Set time Set time Set time Set time

01-18

6-1 WIRELESS REMOTE CONTROLLER

( Table 4 : Timer setting )

ON TIMER / OFF TIMER PROGRAM TIMER SLEEP TIMER

*WEEKLY TIMER

* For AS*G07/ 09/ 12/ 14LUCA Type

3. SLEEP TIMER

Set temperature rises

( Ts : Set temperature )

Stop of operation

Set temperature lowers

( Ts : Set temperature )

Stop of operation

Ts

+1°C

+2°C

Set

60min

Set

30min

30min

30min

01-19

Ts

-1

°C

-2°C

-3°C

-4°C

If the sleep is set, the room temperature is monitored and the operation is stopped automatically.
If the operation mode or the set temperature is change after the sleep timer is set, the operation is
continued according to the changed setting of the sleep timer from that time ON.

In the cooling operation mode

When the sleep timer is set, the setting temperature is increased 1°C.
It increases the setting temperature another 1°C after 1 hour.
After that, the setting temperature is not changed and the operation is stopped at the time
of timer setting.

In the heating operation mode

When the sleep timer is set, the setting temperature is decreased 1°C.
It decreases the setting temperature another 1°C every 30 minutes.
Upon lowering 4deg C, the setting temperature is not changed and the operation stops at
the time of timer setting.

4. WEEKLY TIMER (For AS*G07/ 09/ 12/ 14LUCA Type )

This timer function can set operation times of the each day of the week.
All days can be set together,the weekly timer can be used to repeat the timer setting for all of the days.

Setting day Setting day Setting day

ON OFF ON OFF ON OFF

Set time Set time

01-20

6-2 WIRED REMOTE CONTROLLER

The Table 5 shows the available timer setting based on the product model.

ON TIMER / OFF TIMER WEEKLY TIMER TEMPERATURE SET BACK TIMER

( Table 5 : Timer setting )

1. ON TIMER / OFF TIMER

Same to 6-1 ON / OFF TIMER and shown in those.

2. WEEKLY TIMER

This timer function can set operation times of the each day of the week.
All days can be set together,the weekly timer can be used to repeat the timer setting for all of the days.

3. TEMPERATURE SET BACK TIMER

This timer function can change setting temperature of setting operation times of the each day of the week.
This can be together with other timer setting.

Normal tmp.

ON

OFF

Setting day Setting day Setting day

ON OFF ON OFF ON OFF

Set time Set time

Set back tmp.

Set time Set time

7. COMPRESSOR CONTROL

1. OPERATION FREQUENCY RANGE

The operation frequency of the compressor is different based on the operation mode as
shown in the table 6.

Cooling Heating

Min Max Min Max

AO*G18LAT3

20rps 100rps 24rps 110rps

AO*G30LAT4 20rps 90rps 20rps 95rps

(Table 6 : Compressor Operation Frequency Range)

2. OPERATION FREQUENCY CONTROL AT START UP

The compressor frequency soon after the start-up is controlled as shown in the figure 16.

(Fig.16 : Compressor Control at Start-up)

01-21

40rps

120sec

120sec

60 - 780sec

180 - 900sec 300 - 1020sec

56rps

85rps

For AO*G18/ 24LAT3

For AO*G30LAT4

The compressor frequency soon after the start-up is controlled as shown in Figure 17.
(Fig.17 : Compressor Control at Start-up)

40rps

180sec

120sec

60 - 720sec

240 - 900sec 360 - 1020sec

40rps

56rps

AO*G24LAT3

8. ELECTRONIC EXPANSION VALVE CONTROL

9. TEST OPERATION CONTROL

The compressor won't enter operation status for 3 minutes after the compressor is stopped,
even if any operation is given.

10. PREVENT TO RESTART FOR 3 MINUTES ( 3 MINUTES ST )

01-22

The most proper opening of the electronic expansion valve is calculated and controlled under the
present operating condition based on the Table7.
The compressor frequency, the temperatures detected by the discharge temperature sensor
and the outdoor temperature sensor.

At the time of supplying the power to the outdoor unit, the initialization of the electronic
expansion valve is operated (1000 pulses are input to the closing direction).

Under the condition where the air conditioner stops, press the MASTER CONTROL button and
the FAN CONTROL button simultaneously for 5 seconds or more, and the test operation control
mode will appear.
During test running, " " will display on the remote controller display.
Set the test operation mode, and the compressor will continue to run regardless of whatever
the room temperature sensor detects.
The test operation mode is released if 60 minutes have passed after setting up the test operation.

With Wired Remote Controller ( without TEST RUN button )

Under the condition where the air conditioner runs, press the TEST RUN button, and
the test operation control mode will appear.
During test running, the operation lamp and timer lamp of the air conditioner body twinkle simultaneously.
Set the test operation mode, and the compressor will continue to run regardless of whether the room
temperature sensor detects.
The test operation mode is released if 60 minutes have passed after setting up the test operation.

With Wireless Remote Controller ( with TEST RUN button )

Cooling /Dry mode

Heating mode

AO*G18/ 24LAT3
AO*G30LAT4

Operation mode Pulse range

50 ~ 480
30 ~ 480

(Table7 : The pulse range of the electronic expansion valve control)

At the time when the air conditioner is switched from the Cooling mode to Heating mode,
the compressor is stopped, and the 4-way valve is switched in 3 minutes later
after the compressor stopped.

When the power was interrupted by a power failure, etc. during operation, the operation contents
at that time are memorized and when power is recovered, operation is automatically resumed with
the memorized operation contents.

(Table 8 : Operation contents memorized when the power is interrupted)

Operation mode

Set temperature

Set air flow

Thermistor detected position

11. 4-WAY VALVE EXTENSION SELECT

12. AUTO RESTART

01-23

13. MANUAL AUTO OPERATION

If MANUAL / AUTO Button is pushed continuous from 3 seconds to 10 seconds,
manual auto operation will starts.
If the remote control is lost or battery power dissipated, this function will work without the remote
control.

OPERATION MODE

Auto changeover

Auto

Continuous
(No timer setting available)

24°C

(Table 9 : Manual auto operation control)

SETTING TEMP.
FAN MODE

TIMER MODE

Timer mode

Wireless remote controller

Wired remote controller
(When Memory Backup : Disable)

Wired remote controller
(When Memory Backup : Enable)

OFF Timer
ON Timer
WEEKLY Timer
Temperature

: Memorize
: Not memorize

*It is necessary to set on the DIP-SW1-No,6 of the wired remote controller, to enable the memory backup.
Refer to the installation manual of wired remote controller for details.

SWING OPERATION
ECONOMY

OFF
OFF

VERTICAL LOUVER

NORMAL
NORMAL

HORIZONTAL LOUVER

All models

Functions

SET BACK Timer

14. COMPRESSOR PREHEATING

01-24

When the outdoor heat exchanger temperature is lower than Operation temperature (Refer to Table 10)
and the heating operation has

been stopped for 3 hours, power is applied to the compressor and
the compressor is heated.
(By heating the compressor, warm air is quickly discharged when operation is started.)
When operation was started, and when the outdoor temperature rises to Release temperature or greater,
preheating

is over.

(Table 10 : Preheating Operation / Release Temperature)

Before 24 hour After 24 hour

Operation
temperature

Operation
temperature

Release
temperature

Release
temperature

3°C 7°C 0°C 4°C

15. POWERFUL OPERATION

The POWERFUL OPERATION functions by pressing POWERFUL button on the remote controller.
The indoor unit & outdoor unit will operate at maximum power as shown in Table11.

Release Condition is as follows.
[Cooling / Dry]

- Room tenperature < Setting temperature - 1.5°C or Operation time has passed 20 minutes.

COMPRESSOR FREQUENCY Maximum
FAN CONT. MODE Powerful
SETTING LOUVER Cooling/ Dry : 3, Heating : 5

(Table11)

Powerful operation

=

=

[Heating]

- Room tenperature > Setting temperature +1.5°C or Operation time has passed 20 minutes.

16. 10°C HEAT OPERATION

10°C HEAT operation performs as below when pressing 10°C HEAT button or
Weekly timer setting on the remote controller.

Mode Heating
Setting temperature 10°C
Fan mode Auto
LED display Economy
Defrost operation Operate as normal

(Table 12 : 10°C HEAT operation )

17. ECONOMY OPERATION

The ECONOMY operation functions by pressing ECONOMY button on the remote controller.
At the maximum output, ECONOMY Operation is approximately 70% of normal air conditioner operation
for cooling and heating.
The ECONOMY operation is almost the same operation as below settings.

Mode Cooling/ Dry Heating
Target temperature Setting temp.+1°C Setting temp.-1°C

(Table 13 )

01-25

The External Electrical Heater is operated as below.

19. EXTERNAL ELECTRICAL HEATER CONTROL (For AR type)

(Fig. 19 : External electrical heater control)

When the room
temperature rises

When the room
temperature drops

Ts : Setting temperature

Heater : OFF

Heater : ON

Heater : OFF

Ts - 10°C

Ts - 1°C

Ts - 3°C

Ts - 12°C

When all of the following conditions are met, external elecrtical heater will operate according to Figure 19.

1). When one of the ON conditions is not met.

2). When Defrost operation or Oil recovery operation starts

< Heater : ON condition >

< Heater : OFF condition >

System type
Operation mode
Compressor
Indoor fan

Heatpump
Heating
ON
ON (S-Lo is excluded)

The fan motor for Fresh Air is operated in synchronization with the indoor fan operation
as shown in Figure 18.

18. FRESH AIR CONTROL( For AU / AR type)

(Fig. 18 : Fresh Air control)

Operation
Stop

Operation
Stop

Fan motor
(Indoor unit)

Fan motor
(for Fresh Air)

*It needs the external relay and power supply.

01-26

20. DRAIN PUMP OPERATION( For AU / AR type)

1. When the compressor starts, the drain pump starts simultaneously.

2. The drain pump operates continuously for 3 minutes after the compressor is turned off.

3. When the compressor stops by the "Anti- freezing protection", the drain pump is turned off
in 1 hour after the compressor stops.

4. When the water level in the drain pan rises up and then the float switch functions:
The compressor, indoor and outdoor fan motor operation are stopped.
Drain pump operates continuously for 3 minutes after the float switch is turned off.
(Almost condensing water may be drained)

5. When the float switch turns ON continuously for 3 minutes, "FAILURE INDICATION" operates.

(It is necessary to turn off power for release it. )

6. When the float switch turns OFF less than 3 minutes, the unit starts Cooling operation.

1

2

1.When the water level in the drain pan rises up and then the float switch functions:
Drain pump operates continuously for 3 minutes after the float switch is turned off.
(Almost condensing water may be drained)

2. When the float switch turns ON continuously for 3 minutes, "FAILURE INDICATION" operates.
Thereafter, even if the float switch turns OFF, the "FAILURE INDICATION" is not released.
(It is necessary to turn off power for release it. )

1

During Cooling / Dry mode

3 minutes

ON
OFF

ON
OFF

Compressor

Drain Pump

3 minutes

3 minutes ST

ON
OFF

ON
OFF

ON
OFF

ON
OFF

Float Switch

Compressor

Indoor Fan

Drain Pump

3 minutes

ON
OFF

ON
OFF

Float Switch

Drain Pump

During HEATING / FAN mode / Stop operation

<Float Switch turns OFF less than 3 minutes>

Less than 3 minutes

The indoor unit fan motor operates after the float switch is turned off.

3

( Fig. 20 : Detail of Drain Pump Operation in Cooling / Dry )

( Fig. 21 : Detail of Drain Pump Operation in Heating )

21. DEFROST OPERATION CONTROL

01-27

2. CONDITION OF THE DEFROST OPERATION COMPLETION

Defrost operation is released when the conditions become as shown in Table 15-1, 15-2.

(Table 15-1 : Defrost release condition)

Release Condition

Outdoor heat exchanger temperature sensor value is higher than 10°C or
Compressor operation time has passed 15 minutes.

1. CONDITION OF STARTING THE DEFROST OPERATION

The defrost operation starts when the outdoor heat exchanger temperature sensor detects
the temperature lower than the values shown in Table 14-1, 14-2, 14-3.

(Table 14-1 : Condition of starting defrost operation)

Less than 6 min. *1

or 10min. *2

*2. Compressor stop time:

Below 20min. Select 6min.
Above 20min. Select 10min.

After 6 min. *1

or 10min. *2

Compressor integrating
operation :Less than 45min.

Compressor integrating
operation :45min and over

-8°C *3

-12°C *4

-14°C *5

-16°C *6

Does not operate

*1. It means contiguous operation time.

1-1 NORMAL DEFROST

(Table 15-2 : Defrost release condition)

Release Condition

Outdoor heat exchanger temperature sensor value is higher than 12°C or
Compressor operation time has passed 15 minutes.

(Table 14-2 : Condition of starting defrost operation)

Less than 6 min. *1

or 10min. *2

*3. Outdoor temp. > -1°C
*4. Outdoor temp. < -1°C

*2. Compressor stop time:

Below 20min. Select 6min.
Above 20min. Select 10min.

After 6 min. *1

or 10min. *2

Compressor integrating
operation :Less than 45min.

Compressor integrating
operation :45min and over

-10°C *3

-12°C *4

Does not operate

=

*1. It means contiguous operation time.

*3. Outdoor temp. > 3°C
*4. Outdoor temp. > -1°C
*5. Outdoor temp. > -5°C
*6. Outdoor temp. < -5°C

Normal defrost

Normal defrost

Integrating defrost

If the compressor continuous operation time is less than 10 minutes,
the OFF number of the compressor is counted.
If any defrost operated, the compressor OFF count is cleared.

More than 210 minutes
(For continuous operation)

Less than 10 minutes
( For intermittent operation )

Compressor integrating operation time

When the compressor is

stopped, If detected

outside air temp. at 2°C

OFF count of the compressor

40 times

( at outside air temp. < 2°C )

1-2. INTEGRATING DEFROST

(Table 14-3 : Condition of starting defrost operation)

For AO*G18/ 24LAT3

For AO*G30LAT4

For AO*G18/ 24LAT3, AOG30LAT4

For AO*G18/ 24LAT3

For AO*G30LAT4

=

01-28

3 sec later Compressor : OFF
3 sec later Outdoor fan motor : OFF
28sec later 4WAY valve : OFF
34sec later Compressor : ON

3. Defrost Flow Chart

The defrosting shall proceed by the integrating operation time, outdoor temperature
and outdoor heat exchanger temperature as follows.

(Not defrosted for 6 or 10 minutes)

Heating operation start : Compressor ON

Outdoor HEX temp. : Over 10°C

or

Compressor ON time: Maximum 15 minutes

Defrost end

Outdoor HEX
temp.Below

-8°C

Integrating defrost

Defrost Indicator:
[Operation lamp]
7 sec ON / 2 sec O FF

Defrost start

Normal defrost

Outside air temp.

> 3°C

Compressor
integrating
operation:
Over 210 min.

Intermittent operation

Compressor
OFF count :
40 times
(Less than 10min.)

Continuous operation

Outdoor HEX
temp.Below

-12°C

Outside air temp.

> -1°C

Outdoor HEX
temp.Below

-14°C

Outside air temp.

> -5°C

Outdoor HEX
temp.Below

-16°C

Outside air temp.

< -5°C

For AO*G18/ 24LAT3

When the
compressor is

stopped,
If detected outside
air temp. at 2°C

=

01-29

3 sec later Compressor : OFF
3 sec later Outdoor fan motor : OFF
28sec later 4WAY valve : OFF
34sec later Compressor : ON

(Not defrosted for 6 or 10 minutes)

Heating operation start : Compressor ON

Outdoor HEX temp.: Over 12°C

or

Compressor ON time: Maximum 15 minutes

Defrost end

Integrating defrost

Defrost Indicator:
[Operation lamp]
7 sec ON / 2 sec O FF

Defrost start

Normal defrost

Compressor
integrating
operation:
Over 210 min.

When the

compressor is

stopped,

If detected outside

air temp. at 2°C.

Intermittent operation

Compressor
OFF count :
40 times
(Less than 10min.)

Continuous operation

Outdoor HEX
temp.Below

-10°C

Outside air temp.

> -1°C

Outdoor HEX
temp.Below

-12°C

Outside air temp.

< -1°C

For AO*G30LAT4

=

22. VARIOUS PROTECTIONS

1. DISCHARGE GAS TEMPERATURE OVER RISE PREVENTION CONTROL

The discharge gas thermosensor (discharge thermistor : Outdoor side) will detect discharge gas
temperature.

When the discharge temperature becomes higher than  ,the compressor frequency
is decreased 20rps, and it continues to decrease the frequency for 20rps every 120 seconds until
the temperature becomes lower than .
When the discharge temperature becomes lower than ,the control of the compressor
frequency is released.

When the discharge temperature becomes higher than  ,the compressor stops.
When the discharge temperature becomes lower than 80°C ,the compressor operates.

2. CURRENT RELEASE CONTROL

01-30

The compressor frequency is controlled so that the outdoor unit input current does not exceeds
the current limit value that was set up with the outdoor temperature.
The compressor frequency returns to the designated frequency of the indoor unit at the time
when the frequency becomes lower than the release value.

3. ANTI-FREEZING CONTROL (Cooling mode)

When the indoor unit heat exchanger and
2-way valve temperature becomes lower than  ,the compressor frequency
is decreased 20rps, and it continues to decrease the frequency for 20rps every 120 seconds until
the temperature becomes higher than .

This operation is not released until both the temperature of the indoor unit heat exchanger and
2-way valve temperature exceed the release temperature.

(Table 17 : Anti-freezing Protection Operation / Release Temperature)

AO*G18/ 24LAT3

105°C 95°C 110°C

Tenperrature

AO*G30LAT4

Tenperrature Tenperrature

110°C 100°C 115°C

(Table 16 : Discharge Temperature Over Rise Prevension Control / Release Temperature)

12°C

3°C 2°C 6°C

Temperature Temperature

3°C 2°C 13°C

Outside air
Temperature

Indoor Heat Ex.
Temperature

2-way valve
Temperature

Indoor Heat Ex.
Temperature

2-way valve
Temperature

12°C

5°C

12°C

=

>

<

01-31

4. COOLING PRESSURE OVER RISE PROTECTION

When the outdoor unit heat exchange sensor temperature rises to 70.5 3°C) or greater,
the compressor is stopped and error display is indicated.

5. HIGH TEMPERATURE RELEASE CONTROL ( HEATING MODE )

On heating mode, the compressor frequency is controlled as following based on the
detection value of the indoor heat exchanger temperature sensor.

(Fig 22 : Heating Overload Protection Control)

7. COMPRESSOR TEMPERATURE PROTECTION

Compressor temperature sensor is monitoring the compressor temperature.
When the compressor temperature sensor detects higher than Temperature ,
the compressor is stopped.

6. HIGH PRESSURE PROTECTION

(1) When the pressure switch becomes OFF (Open : higher than 4.2 MPa),

the compressor is stopped.
It is released when the pressure switch becomes ON (Close : lower than 3.2 MPa)
after 3 minutes of compressor stop.

(2) When the pressure switch is opened for 10 seconds from power on, all of outdoor unit operation is stopped.

The outdoor unit will start up if the pressure switch is returned to ON after 10 seconds has passed.

When 10 minutes (Cooling) or 3 minutes (Heating) has passed from the compressor stop and
pressure switch becomes ON, protection is released and the compressor will restart.

110°C

125°C

80°C

+

AO*G30LAT4

Temperature

Temperature

When 3 minutes has passed from the compressor stop and the compressor temperature sensor detects
lower than Temperature , protection is released and the compressor will restart.

+

-

AO*G18/ 24LAT3

Indoor heat exchange
temperature

63°C

Compressor is OFF

The compressor frequency is
decreased 10rps every 20 seconds.

56°C

54°C

A°C

B°C

Outdoor heat exchange
tempreture

-9°C

Stable range

Release

=

<

Th

-11°C

=

<

Th

< -9°C

-13°C

=

<

Th

< -11°C

-15°C

=

<

Th

< -13°C

Th

< -15°C

In one operation of
the indoor unit
: Qu air than

All indoor unit
opeate,
: Qu air

52°C
52°C
52°C
50°C
48°C

50°C
50°C
48°C
46°C
44°C

48°C

48°C
48°C
48°C
48°C

46°C

46°C
46°C
46°C
46°C

A°C A°CB°C B°C

The compressor frequency is
decreased 6rps every 60 seconds.

The compressor frequency is
decreased 2rps every 60 seconds.

Release

2 . TROUBLE SHOOTING

R410A

INVERTER (MULTI )

Universal Floor / Celling
Slim Duct / Compact Cassette
Compact Wall Mounted /
Wall Mounted / Floor type

02-01

2-1 ERROR DISPLAY

2-1-1 INDOOR UNIT AND WIRED REMOTE CONTROLLER DISPLAY

Please refer the flashing pattern as follows.
The Operation, Timer, Economy lamps operate as follows according to the error contents.

Manual auto switch error

Indoor room thermistor error

Indoor unit model information error
EEPROM access abnormal

Wired remote controller

communication error

Error Contents

Continuous

Continuous

4 times

Continuous2 times

3 times

3 times

5 times

Continuous2 times1 times

Continuous1 times1 times

Trouble
shooting

Economy

(Green)

Timer

(Orange)

Operation

(Green)

1 times

Serial communication error

Indoor unit fan motor error

Indoor heat ex. thermistor error

Continuous4 times 2 times

Continuous1 times5 times

Continuous

Continuous4 times

7 times

6 times

1 times

Continuous

7 times 3 times

Continuous

7 times 4 times

Continuous

2 times

7 times

Active filter error

Discharge thermistor error

Heat ex. thermistor error

Outdoor thermistor error

Compressor thermistor error

1,2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

3

0

Continuous

7 times 7 times

Heat sink thermistor error

Continuous8 times 6 times

High pressure switch error

Continuous10 times 3 times

Compressure temp. error

Continuous

Continuous5 times

9 times

9 times

7 times

Compressor control error

Outdoor unit fan motor error

Continuous4 times9 times

Continuous9 times 9 times4-way valve error

Continuous1 times10 times

Discharge temp. error

Over current error

Continuous5 times6 times

IPM error

Indoor Unit Display

Wired Remote

Controller

Display

11

12

22

32

35

41

42

51

53

57

57

58

62

64

65

71

72

73

74

76

76

77

86

94

95

97

99

A1

A3

Indoor unit capacity error

Continuous2 times2 times

Continuous2 times6 times

Outdoor unit model information error

Intake grille error

Continuous7 times 6 times

2-way valve thermistor error

Continuous7 times 6 times

3-way valve thermistor error

Continuous5 times 7 times

Damper (Open/Close) detection
limit switch error

Continuous3 times5 times

Drain pump error

Continuous5 times 7 times

Continuous5 times 8 times

Damper (Open/Close) simultaneous
detection limit switch error

02-02

When " Er " in Temperature Display is displayed, inspection of the air conditioning system is necessary.
Please consult authorized service personnel.

2-1-2 WIRED REMOTE CONTROLLER DISPLAY

1. SELF - DIAGNOSIS

SUMOTU WETH FR SA

Unit number (usually 0)

Error code

ex. Self-diagnosis check

2. ERROR CODE HISTORY DISPLAY

Up to 16 memorized error codes may be displayed for the indoor unit connected to the remote controller.

1. Stop the air conditioner operation.

2. Press the SET TEMPERATURE buttons , simultaneously for 3 seconds
or more to start the self-diagnosis.

4. Press the SET TEMPERATURE buttons , simultaneously for 3 seconds or more

or there is no key input for 60 seconds to stop the display.

3. Press the SET TEMPERATURE button to select the error history number.

SU MO TU WETH FR SA

Error code

Error history number

01234567
FEdcbA98

ı

ı

Lower

Raise

02-03

0.5sec 0.5sec 2sec

ON

OFF

1. ERROR DISPLAY

2. ERROR DISPLAY METHOD

Outdoor LED Blink (1 to 22 times) 0.5sec ON / 0.5sec OFF blinking

2-1-3 OUTDOOR UNIT DISPLAY

2-way Valve Thermistor Error

(for Indoor unit A)

Serial Communication Error
(Outdoor unit to Indoor unit C)

Serial Communication Error
(Outdoor unit to Indoor unit D)

Serial Communication Error
(Outdoor unit to Indoor unit B)

17

Error Contents

٨ 1 time

٨ 1 time

٨ 1 time

٨ 1 time

٨ 2 times

OFF
OFF OFF

OFF OFF

OFFOFF

OFF

OFF

OFF
OFF

OFF
OFFOFF

OFF

19

٨ 3 times

OFFOFF

OFF

٨ 4 times

OFFOFF

OFF

٨ 5 times

OFFOFF

OFF

٨ 7 times

OFF

OFF

٨ 8 times

OFF

OFF

٨ 9 times

OFF

OFF

٨ 10 times

OFF

OFF

٨ 11 times

OFF

OFF

٨ 12 times

OFF

OFF

٨ 13 times

OFF

OFF

٨ 14 times

OFF

OFF
OFF

OFF
OFF
OFF
OFF

OFF
OFF

OFF

٨ 15 times

OFFOFF

OFF

٨ 17 times

OFFOFF

OFF

2

Trouble
shooting

LED1 LED2 LED3 LED4

Serial Communication Error
(Outdoor unit to Indoor unit A)

Indoor Unit Capactiy Error

Outdoor Unit PCB Microcomputer

Communication Error

Outdoor Unit fan motor Error

Over Current Error
Compressor Control Error

Compressor Thermistor Error

Heat Sink Thermistor Error
High Pressure switch 1 Error
High Pressure switch 2 Error

Discharge Thermistor Error

Heat Ex. Thermistor Error

Outdoor Thermistor Error

2-way Valve Thermistor Error

(for Indoor unit B)

2-way Valve Thermistor Error

(for Indoor unit C)

2-way Valve Thermistor Error

(for Indoor unit D)

٨ 5 times

٨ 5 times

٨ 5 times

OFF
OFF OFF
OFF OFF

OFF

OFF
OFF

OFF

3-way Valve Thermistor Error

(for Indoor unit A)

3-way Valve Thermistor Error

(for Indoor unit B)

3-way Valve Thermistor Error

(for Indoor unit C)

3-way Valve Thermistor Error

(for Indoor unit D)

٨ 6 times

OFFOFF

OFF

٨ 6 times

٨ 6 times

٨ 6 times

OFF
OFF OFF
OFF OFF

OFF

OFF
OFF

OFF

IPM Error

Discharge Temp. Error

٨ 18 times

OFFOFF

OFF

Compressor Temp. Error

٨ 19 times

OFFOFF

OFF

4-way Valve Error

٨ 20 times

OFFOFF

OFF

Outdoor Unit PCB Model Information

Error
Active Filter Error

٨ 21 times

OFFOFF

OFF

٨ 22 times

OFFOFF

OFF

٨ : Flashing

20

21

22

18
23

24

4

25
26
16

27
14
29

30
28

14
15

Trouble shooting 1
OUTDOOR UNIT Error Method:

Detective Actuators: Detective details:

Forecast of Cause:

OK

Indicate or Display:

Refer to error code table.

YESYES

NO

Serial communication error
(Serial reverse transfer error)

Outdoor unit Main PCB
Outdoor unit fan motor

1. Connection failure 2. External cause 3. Main PCB failure 4. Active filter module failure

5. Filter PCB failure 6. Outdoor unit fan motor failure

Check Point 1-1 : Reset the power and operate

Does error indication reappear?

Check Point 1-2 : Check external cause such as noise

Check if the ground connection is proper.
Check if there is any equipment that causes harmonic wave
near the power cable (Neon light bulb or any electronic
equipment which causes harmonic wave).

Check Point 2 : Check connection

Check any loose or removed connection line of
between indoor unit and outdoor unit.

>> If there is an abnormal condition, correct it by

referring to Installation Manual or Data &

Technical Manual.

Check connection condition in control unit.
(If there is loose connector, open cable or mis-wiring)

Check Point 3 : Check the voltage of power supply

Check the voltage of power supply

>> Check if AC198V(AC220V-10%) - 264V(AC240V+10%) appears

at outdoor unit terminal L - N.

When the indoor unit cannot receive the serial signal from Outdoor unit
more than 2minutes after power ON, or the indoor unit cannot receive
the serial signal more than 15seconds during normal operation.

02-04

2-2 TROUBLE SHOOTING WITH ERROR CODE

OK

Check Point 4 : Check serial signal (Reverse transfer signal)

Check serial signal (Reverse transfer signal)

>> Check if indicated value swings between AC70V and AC130V at outdoor unit terminal 1 - 3.
>> If it is abnormal, Check the parts as follows.

- Outdoor unit fan motor (PARTS INFORMATION 5)

- Active filter module (PARTS INFORMATION 6)

- Filter PCB (Check the wire of CN34)
>> If Outdoor fan motor is abnormal, replace Outdoor unit fan motor and Main PCB.
>> If Active filter module or IPM is abnormal, replace it.
>> If the parts are normal, replace Main PCB.

1
2

3

RED

WHITE

BLACK

+

-

Trouble shooting 2
INDOOR UNIT Error Method:

Detective Actuators: Detective details:

Forecast of Cause:

OK

Indicate or Display:

Refer to error code table.

YESYES

NO

OK

Serial communication error
(Serial forward transfer error)

Indoor unit Controller PCB

1. Connection failure 2. External cause 3. Controller PCB failure

Check Point 1-1 : Reset the power and operate

Does error indication reappear?

Check Point 1-2 : Check external cause such as noise

Check if the ground connection is proper.
Check if there is any equipment that causes harmonic wave
near the power cable (Neon light bulb or any electronic
equipment which causes harmonic wave).

Check Point 2 : Check connection

Check any loose or removed connection line of
between indoor unit and outdoor unit.

>> If there is an abnormal condition, correct it by
referring to Installation Manual or Data &
Technical Manual.

Check connection condition in control unit.
(If there is loose connector, open cable or mis-wiring)

Check Point 3 : Check the voltage of power supply

Check the voltage of power supply

>> Check if AC198V(AC220V-10%) - 264V(AC240V+10%) appears
at outdoor unit terminal L - N.

Check Point 4 : Check serial signal (Forward transfer signal)

Check serial signal (Forward transfer signal)

>> Check if indicated value swings between AC70V and AC130V at outdoor unit terminal 2 - 3.
>> If it is abnormal, replace Controller PCB.

When the outdoor unit cannot properly receive the serial signal from
indoor unit for 10 seconds or more.

02-05

1
2

3

RED

WHITE

BLACK

+

-

Trouble shooting 3
INDOOR UNIT Error Method:

Detective Actuators: Detective details:

Forecast of Cause:

Check Point 2 : Check Wired Remote Controller and Controller PCB

Check Point 1 : Check the connection of terminal

OKOK

Indicate or Display:

Wired remote controller
communication error

Indoor unit Controller PCB
Wired remote controller (Option)

1. Connection failure 2. Wired remote controller failure 3. Controller PCB failure

Check & correct the followings.
Check the connection of terminal between Wired Remote Controller and indoor unit,
and check if there is a disconnection of the cable.

When the indoor unit cannot properly receive the signal from
Wired Remote Controller for 1 minute or more.

02-06

Refer to error code table.

>> If it is DC12V, Remote Control is failure. (Controller PCB is normal) >> Replace Remote Control
>> If it is DC 0V, Controller PCB is failure. (Check Remote Control once again) >> Replace Controller PCB

Check Voltage at terminal 1-3 of Controller PCB or Communication PCB.
(Power supply to Remote control)
Cassette, Duct, Universal Floor/Ceiling Type : CN14
Wall mount ,Floor Type : CN6
Compact Wall mount Type : CN305 (UTY-XCBXZ1)

Detective Actuators: Detective details:

Forecast of Cause :

OKOK

All indoor unit

The total capacity of the indoor unit if it is install beyond.

1. The selection of indoor units is incorrect 2. Main PCB (Outdoor unit) failure

Check Point 1 : Check the total capacity of indoor unit

Check the total capacity of the connected indoor units.

>> If abnormal condition is found, correct it by referring
to Installation Manual or Design & Technical Manual.

02-07

Trouble shooting 4
INDOOR UNIT Error Method:

Indicate or Display:

Indoor unit capacity error

Refer to error code table.

Check Point 2 : Replace Main PCB

If Check Point 1 do not improve the symptom, replace Main PCB of Outdoor unit.

02-08

Trouble shooting 5
INDOOR UNIT Error Method:

Indicate or Display:

Indoor unit model information error
EEPROM access abnormal

Refer to error code table.

Detective Actuators:

Detective details:

Forecast of Cause:

Check Point 3 : Replace Controller PCB

Check Point 2 :
Check Indoor unit electric components

YESYES

NO

Indoor unit Controller PCB

1. External cause 2. Defective connection of electric components 3. Controller PCB failure

Check Point 1-1 : Reset Power supply and operate

Does Error indication show again?

Check Point 1-2 :
Check external cause such as noise

Check if the ground connection is proper.
Check if there is any equipment that causes harmonic wave
near the power cable (Neon light bulb or any electronic
equipment which causes harmonic wave).

Note : EEPROM

EEPROM(Electronically Erasable and
Programmable Read Only Memory) is a non­volatile memory which keeps memorized
information even if power is turned off. It can
change the contents electronically.
To change the contents, it uses higher
voltage than normal, and it can not change a
partial contents. (Rewriting shall be done
upon erasing the all contents.)
There is a limit in a number of rewriting.

Change Controller PCB.

Check all connectors.
(loose connector or incorrect wiring)

Check any shortage or corrosion on PCB.

When power is on and there is some below case.
When model information of EEPROM is incorrect.
When the access to EEPROM failed.

Trouble shooting 6
INDOOR UNIT Error Method:

Indicate or Display:

Detective Actuators: Detective details:

Forecast of Cause :

OKOK

Manual auto switch error

Indoor unit Controller PCB
Indicator PCB
Manual auto switch

When the Manual auto switch becomes ON for consecutive 60 or
more seconds.

1. Manual auto switch failure 2. Controller PCB and Indicator PCB failure

Check Point 1 : Check the Manual auto switch

Check if Manual auto switch is kept pressed.
Check ON/OFF switching operation by using a meter.

>> If Manual auto switch is disabled (on/off switching), replace it.

Check Point 2 : Replace Controller PCB and Indicator PCB

If Check Point 1 do not improve the symptom, replace Controller PCB and Indicator PCB.

02-09

Refer to error code table.

Detective Actuators:

Indoor unit Controller PCB
Room temperature thermistor

Detective details:

Room temperature thermistor is open or short is detected always.

Forecast of Cause :

1. Connector failure connection 2. Thermistor failure 3. Controller PCB failure

Check Point 2 : Remove connector and check Thermistor resistance value

Check Point 1 : Check connection of Connector

Check if connector is loose or removed
Check erroneous connection
Check if thermistor cable is open

>>Reset Power when reinstalling due to removed connector or incorrect wiring.

OK

OK

Trouble shooting 7
INDOOR UNIT Error Method:

Indicate or Display:

Indoor room thermistor error

Refer to error code table.

Check Point 3 : Check voltage of Controller PCB (DC5.0V)

Make sure circuit diagram of each indoor unit and check terminal voltage at Thermistor (DC5.0V)

Small size Wall mount circuit diagram(Connector connection)

If the voltage does not appear, replace Controller PCB.

H/E (MID) Thermistor

Room Temp. Thermistor

Room Temp. Thermistor

H/E Thermistor

Cassette circuit diagram (Connector connection)

Wall mount Scircuit diagram (Direct soldering to PCB)

Duct circuit diagram (Connector connection)

BLACK
BLACK

3
4

CN4

1
2

3
4

1
2

BLACK
BLACK

BLACK

BLACK

BLACK
BLACK

1
2

1
2

CN3

CN1

121
2
33

RED
WHITE

H/E Thermistor

Room Temp. Thermistor

BLACK
BLACK

121

2

11
22

11
22

CN5

CN8

GRAY
GRAY

1
2

CN7

BLACK
BLACK

121

2

121

2

121

2

11
2

1
2

2

CN5

CN8

GRAY
GRAY

H/E (MID) Thermistor

Room Temp. Thermistor

02-10

H/E (MID) Thermistor

Room Temp. Thermistor

BLACK
BLACK

CN5

CN8

GRAY
GRAY

CN7

BLACK
BLACK

Universal floor / ceiling circuit diagram (Connector connection) Floor circuit diagram (Connector connection and Direct soldering to PCB)

BLACK
BLACK

121

2

1
2

CN3

CN1

GRAY
GRAY

H/E (MID) Thermistor

Room Temp. Thermistor

DC

Thermistor Characteristics (Rough value)

If Thermistor is either open or shorted, replace it and reset the power.

6.5

35

8.0

30

10.012.515.820.225.233.6

Resistance Value ( )

2520151050

58.2

-10

44.0

-5

Temperature (°C)

Resistance Value ( )

4.35.3

4540

Temperature (°C)

Detective Actuators:

Indoor unit Controller PCB
Heat exchanger (MID) thermistor

Detective details:

Heat exchanger (MID) thermistor is open or short is detected always.

Forecast of Cause :

1. Connector failure connection 2. Thermistor failure 3. Controller PCB failure

Check Point 1 : Check connection of Connector

Check if connector is loose or removed
Check erroneous connection
Check if thermistor cable is open

>>Reset Power when reinstalling due to removed connector or incorrect wiring.

OK

02-11

Trouble shooting 8
INDOOR UNIT Error Method:

Indicate or Display:

Indoor heat ex. thermistor error

Refer to error code table.

OK

Check Point 3 : Check voltage of Controller PCB (DC5.0V)

Make sure circuit diagram of each indoor unit and check terminal voltage at Thermistor (DC5.0V)

Small size Wall mount circuit diagram(Connector connection)

If the voltage does not appear, replace Controller PCB.

H/E (MID) Thermistor

Room Temp. Thermistor

Room Temp. Thermistor

H/E Thermistor

Cassette circuit diagram (Connector connection)

Wall mount Scircuit diagram (Direct soldering to PCB)

Duct circuit diagram (Connector connection)

BLACK
BLACK

3
4

CN4

1
2

3
4

1
2

BLACK
BLACK

BLACK

BLACK

BLACK
BLACK

1
2

1
2

CN3

CN1

121
2
33

RED
WHITE

H/E Thermistor

Room Temp. Thermistor

BLACK
BLACK

121

2

11
22

11
22

CN5

CN8

GRAY
GRAY

1
2

CN7

BLACK
BLACK

121

2

121

2

121

2

11
2

1
2

2

CN5

CN8

GRAY
GRAY

H/E (MID) Thermistor

Room Temp. Thermistor

H/E (MID) Thermistor

Room Temp. Thermistor

BLACK
BLACK

CN5

CN8

GRAY
GRAY

CN7

BLACK
BLACK

Universal floor / ceiling circuit diagram (Connector connection) Floor circuit diagram (Connector connection and Direct soldering to PCB)

BLACK
BLACK

121

2

1
2

CN3

CN1

GRAY
GRAY

H/E (MID) Thermistor

Room Temp. Thermistor

DC

Thermistor Characteristics (Rough value)

If Thermistor is either open or shorted, replace it and reset the power.

Check Point 2 : Remove connector and check Thermistor resistance value

Resistance Value ( )

Temperature (°C)

Resistance Value ( )

Temperature (°C)

1131.9 579.6 312.3 233.2 176.0 134.2 103.3 80.3 62.9

49.7 39.6 31.7 25.6 20.8 17.1 14.1 11.6 10.4

-30 -20 -10 -5 0 5 10 15 20

25 30 35 40 45 50 55 60 63

02-12

Trouble shooting 9
INDOOR UNIT Error Method:

Indicate or Display:

Indoor unit fan motor error

Refer to error code table.

Detective Actuators:

Detective details:

Forecast of Cause:

Check Point 1 : Check rotation of Fan

Check Point 2 : Check ambient temp. around motor

OK

OK

OK

Indoor unit Controller PCB
Indoor unit fan motor

1. Fan rotation failure 2. Fan motor winding open 3. Motor protection by surrounding temperature rise

4. Control PCB failure 5. Indoor unit fan motor failure

Rotate the fan by hand when operation is off.
(Check if fan is caught, dropped off or locked motor)

>>If Fan or Bearing is abnormal, replace it.

Check excessively high temperature around the motor.
(If there is any surrounding equipment that causes heat)

>>Upon the temperature coming down, restart operation.

When the condition that actual frequency of Indoor Fan is
below 1/3 of target frequency is continued more than 56 seconds.

Check Point 4 : Replace Controller PCB

If Check Point 1- 3 do not improve the symptom, replace Controller PCB.

Check Point 3 : Check Indoor unit fan motor

Check Indoor unit fan motor. (PARTS INFORMATION 4)

>>If Indoor unit fan motor is abnormal, replace Indoor unit fan motor.

Indicate or Display:

Refer to error code table.

Trouble shooting 10
INDOOR UNIT Error Method:

Drain pump error

Detective Actuators:

Indoor unit Controller PCB
Float switch

Detective details:

When Float switch is ON for more than 3 minutes.

Check Point 1 : Check Float switch

Check operation of float switch. (any blocking by dust, etc.)
Remove Float switch and check ON/OFF switching operation

by using a meter.

>>If Float switch is abnormal, replace it.

ON OFF

OK

Forecast of Cause :

1. Float switch failure 2. Shorted connector/wire 3. Controller PCB failure

4. Drain pump failure 5. Hose clogging

Check Point 2 : Check Connector (CN 9) / Wire

Check loose contact of CN9 /shorted wire (pinched wire).

>>Replace Float switch if the wire is abnormal

Check Point 4 : Check Controller PCB

If Check Point 1 ~ 3 do not improve the symptom, change
Controller PCB and execute the check operation again.

Attention!!

Wall mount / Small size wall mount type
does not have a float switch.
In this case, replace

Controller PCB

and set up the original address.
Please refer to.

OK

OK

Check Point 3 : Check Drain hose

Check Drain hose .

>>If there is Hose clogging. Please clear the clog.

02-13

Indicate or Display:

Refer to error code table.

02-14

Detective Actuators:

Detective details:

Forecast of Cause :

Indoor unit Controller PCB
Limit switch
Damper

When limit switch were not able to detect the close though the damper close.
(Upper air flow)
When limit switch were not able to detect the open though the damper open.
(Upper & Lower air flow)

1. Limit switch failure 2. Shorted connector/ wire 3. Damper faulure

4. Controller PCB failure

Check Point 2 : Check Point 2 : Check Connector (CN18) / Wire

Check Point 1 : Check Limit switch

Check Point 4 : Replace Controller PCB

OKOK

OKOK

Check operation of limit switch. (any blocking by dust, etc.)
Remove Limit switch and check ON/OFF switching operation by using a meter.

>>If Limit switch is detective, replace it.

Check loose contact of CN18 /shorted wire (pinched wire).

>>Replace Limit switch if the wire is abnormal

Check Point 2 : Check Point 3 : Check Damper

OKOK

>>Replace Damper if the damper is abnormal

If Check Point 1 3 do not improve the symptom, change Controller PCB.

Check the obstruction of damper movement.
Check the damper movement.

Trouble shooting 11
INDOOR UNIT Error Method:

Damper(Open/Close) detection
limit switch error

Indicate or Display:

Refer to error code table.

02-15

Detective Actuators:

Detective details:

Forecast of Cause :

Indoor unit Controller PCB
Limit switch

When the limit switch detects open and close at the simultaneous.

1. Limit switch failure 2. Shorted connector/ wire 3. Controller PCB failure

Check Point 2 : Check Point 2 : Check Connector (CN18) / Wire

Check Point 1 : Check Limit switch

Check Point 3 : Replace Controller PCB

OKOK

Check operation of limit switch. (any blocking by dust, etc.)
Remove Limit switch and check ON/OFF switching operation by using a meter.

>>If Limit switch is detective, replace it.

Check loose contact of CN18 /shorted wire (pinched wire).

>>Replace Limit switch if the wire is abnormal

OKOK

If Check Point 1 & 2 do not improve the symptom, change Controller PCB.

Trouble shooting 12
INDOOR UNIT Error Method:

Damper(Open/Close) simultaneous
detection limit switch error

02-16

Trouble shooting 13

INDOOR UNIT

INDOOR UNIT Error Method:

Detective Actuators:

Detective details:

Forecast of Cause :

Intake grille error

Indoor unit Controller PCB
Micro switch

When the Micro switch is detected open while running the compressor.

1. Micro switch failure 2. Shorted connector/ wire 3.Controller PCB failure

Indicate or Display:

Refer to error code table.

Check Point 2 : Check Point 2 : Check Connector (CN11) / Wire

Check Point 1 : Check Limit switch

Check Point 3 : Replace Controller PCB

OKOK

Check operation of Micro switch. (any blocking by dust, etc.)

Remove Micro switch and check ON/OFF switching operation by using a meter.

>>If Micro switch is detective, replace it.

Check loose contact of CN11 /shorted wire (pinched wire).

>>Replace Micro switch if the wire is abnormal

OKOK

If Check Point 1 & 2 do not improve the symptom, change Controller PCB.

02-17

Trouble shooting 14
INDOOR UNIT Error Method:

Indicate or Display:

Outdoor unit model information error

Refer to error code table.

Detective Actuators:

Detective details:

Forecast of Cause:

Check Point 3 : Replace Main PCB

Check Point 2 :
Check Indoor unit electric components

YESYES

NO

Outdoor unit Main PCB

1. External cause 2. Defective connection of electric components 3. Main PCB failure

Check Point 1-1 : Reset Power Supply and operate

Does Error indication show again?

Check Point 1-2 :
Check external cause such as noise

Check if the ground connection is proper.
Check if there is any equipment that causes harmonic wave
near the power cable (Neon light bulb or any electronic
equipment which causes harmonic wave).

Note : EEPROM

EEPROM(Electronically Erasable and
Programmable Read Only Memory) is a non­volatile memory which keeps memorized
information even if power is turned off. It can
change the contents electronically.
To change the contents, it uses higher
voltage than normal, and it can not change a
partial contents. (Rewriting shall be done
upon erasing the all contents.)
There is a limit in a number of rewriting.

If Check Point 1,2 do not improve the symptom, replace Main PCB.

Check all connectors.
(loose connector or incorrect wiring)

Check any shortage or corrosion on PCB.

When power is on and there is some below case.
When model information of EEPROM is incorrect.
When the access to EEPROM failed.

OK

Trouble shooting 15
OUTDOOR UNIT Error Method:

Active filter error

02-18

Indicate or Display:

Refer to error code table.

Detective Actuators:

Detective details:

Forecast of Cause :

OKOK

OKOK

Outdoor unit Main PCB
Active filter module

1. External cause 2. Connector connection failure 3. Main PCB failure 4. Active filter module failure

Check Point 2 : Check connection of Connector

Check if connector is removed.

Check erroneous connection.
Check if cable is open.

>>Upon correcting the removed connector or mis-wiring, reset the power.

Check Point 4 : Replace Main PCB

If Check Point 1 - 3 do not improve the symptom, change Main PCB.

Check Point 1 : Check external cause at Indoor and Outdoor (Voltage drop or Noise)

Instant drop : Check if there is a large load electric apparatus in the same circuit.
Momentary power failure : Check if there is a defective contact or leak current

in the power supply circuit.
Noise : Check if there is any equipment causing harmonic wave near electric line.

(Neon bulb or electric equipment that may cause harmonic wave)
Check the complete insulation of grounding.

OKOK

Check Point 3 : Check Active filter module

Check Active filter module. (PARTS INFORMATION 6)

>>If Active filter module is abnormal, replace it.

When inverter input DC voltage is higher than 425V or
lower than 80V.
When a momentary power cut off occurred on low voltage

02-19

Trouble shooting 16
OUTDOOR UNIT Error Method:

IPM error

Indicate or Display:

Refer to error code table.

Detective Actuators:

Detective details:

Forecast of Cause :

Check Point 1 : Replace Main PCB

Outdoor unit Main PCB

1. Main PCB failure

Change Main PCB.

When the signal from FO terminal of IPM in Main PCB is "L"(=0V)
while the compressor stops.

Trouble shooting 17
OUTDOOR UNIT Error Method:

Indicate or Display:

Detective Actuators:

Detective details:

Forecast of Cause :

Check Point 2 :

Check Point 3 :

OKOK

OKOK

Outdoor discharge thermistor error

Outdoor unit Main PCB
Discharge pipe temperature thermistor

When the discharge pipe temperature thermistor open or short-circuit
is detected at power ON or while running the compressor.

1. Connector connection failure 2.Thermistor failure 3. Main PCB failure

Check Point 1 : Check connection of Connector

Check if connector is removed.

Check erroneous connection.
Check if thermistor cable is open.

>>Upon correcting the removed connector or mis-wiring, reset the power.

Check Point 2 : Remove connector and check Thermistor resistance value

Check Point 3 : Check voltage of Main PCB (DC5.0V)

Make sure circuit diagram of outdoor unit and check terminal voltage at Thermistor (DC5.0V)

If the voltage does not appear, replace Main PCB.

02-20

THERMISTOR

(DISCHARGE)

THERMISTOR

(PIPE)

THERMISTOR

(OUTDOOR)

THERMISTOR

(HEAT SINK)

BROWN

BLACK

BLACK

BLUE

CN25 CN26 CN23 CN22 CN21

1 21 21 21 2

Refer to error code table.

THERMISTOR

(COMPRESSOR)

BROWN

1 2

Thermistor Characteristics (Approx. value)

If Thermistor is either open or shorted, replace it and reset the power.

Resistance Value (k )

Temperature(°C)

Resistance Value (k )

Temperature(°C)

-30 -20 -10 0 10 20 30 40 50

60 70 80 90 100 110 120

1013.1 531.6 292.9 168.6 100.9 62.5 40.0 26.3 17.8

12.3 8.7 6.3 4.6 3.4 2.6 2.0

Trouble shooting 18
OUTDOOR UNIT Error Method:

Indicate or Display:

Detective Actuators:

Detective details:

Forecast of Cause :

Check Point 2 :

Check Point 3 :

OKOK

OKOK

Compressor thermistor error

Outdoor unit Main PCB
Compressor temperature thermistor

When the compressor temperature thermistor open or short-circuit is
detected at power ON or while running the compressor.

1. Connector connection failure 2. Thermistor failure 3. Main PCB failure

Check Point 1 : Check connection of Connector

Check if connector is removed.

Check erroneous connection.
Check if thermistor cable is open.

>>Upon correcting the removed connector or mis-wiring, reset the power.

Check Point 2 : Remove connector and check Thermistor resistance value

Check Point 3 : Check voltage of Main PCB (DC5.0V)

Make sure circuit diagram of outdoor unit and check terminal voltage at Thermistor (DC5.0V)

If the voltage does not appear, replace Main PCB.

02-21

THERMISTOR

(DISCHARGE)

THERMISTOR

(PIPE)

THERMISTOR

(OUTDOOR)

THERMISTOR

(COMPRESSOR)

THERMISTOR

(HEAT SINK)

BROWN

BLACK

BLACK

BLUE

BROWN

CN25 CN26 CN23 CN22 CN21

1 21 21 21 21 2

Refer to error code table.

Thermistor Characteristics (Rough value)

If Thermistor is either open or shorted, replace it and reset the power.

Resistance Value (k )

Temperature(°C)

Resistance Value (k )

Temperature(°C)

-30 -20 -10 0 10 20 30 40 50

60 70 80 90 100 110 120

1013.1 531.6 292.9 168.6 100.9 62.5 40.0 26.3 17.8

12.3 8.7 6.3 4.6 3.4 2.6 2.0

Trouble shooting 19
OUTDOOR UNIT Error Method:

Indicate or Display:

Detective Actuators:

Detective details:

Forecast of Cause :

Check Point 2 :

Check Point 3 :

OKOK

OKOK

DC

Heat ex. thermistor error

Outdoor unit Main PCB
Heat exchanger temperature thermistor

When the heat exchanger temperature thermistor open or short-circuit is
detected at power ON or while running the compressor.

1. Connector connection failure 2.Thermistor failure 3. Main PCB failure

Check Point 1 : Check connection of Connector

Check if connector is removed.

Check erroneous connection.
Check if thermistor cable is open.

>>Upon correcting the removed connector or mis-wiring, reset the power.

Check Point 2 : Remove connector and check Thermistor resistance value

Check Point 3 : Check voltage of Main PCB (DC5.0V)

Make sure circuit diagram of outdoor unit and check terminal voltage at Thermistor (DC5.0V)

If the voltage does not appear, replace Main PCB.

02-22

Refer to error code table.

THERMISTOR

(DISCHARGE)

THERMISTOR

(PIPE)

THERMISTOR

(OUTDOOR)

THERMISTOR

(HEAT SINK)

BROWN

BLACK

BLACK

BLUE

CN25 CN26 CN23 CN22 CN21

1 21 21 21 2

THERMISTOR

(COMPRESSOR)

BROWN

1 2

Resistance Value (k )

Temperature(°C)

Resistance Value (k )

Temperature(°C)

-30 -20 -10 0 10 20 30 40 50

60 70 80

95.6 50.3 27.8 16.1 9.6 6.0 3.8 2.5 1.7

1.2 0.8 0.6

Thermistor Characteristics (Approx. value)

If Thermistor is either open or shorted, replace it and reset the power.

Trouble shooting 20
OUTDOOR UNIT Error Method:

Indicate or Display:

Detective Actuators:

Detective details:

Forecast of Cause :

Check Point 2 :

Check Point 3 :

OKOK

OKOK

Outdoor thermistor error

Outdoor unit Main PCB
Outdoor temperature thermistor

When the outdoor temperature thermistor open or short-circuit is
detected at power ON or while running the compressor.

1. Connector connection failure 2.Thermistor failure 3. Main PCB failure

Check Point 1 : Check connection of Connector

Check if connector is removed.

Check erroneous connection.
Check if thermistor cable is open.

>>Upon correcting the removed connector or mis-wiring, reset the power.

Check Point 2 : Remove connector and check Thermistor resistance value

Check Point 3 : Check voltage of Main PCB (DC5.0V)

Make sure circuit diagram of outdoor unit and check terminal voltage at Thermistor (DC5.0V)

If the voltage does not appear, replace Main PCB.

02-23

THERMISTOR

(DISCHARGE)

THERMISTOR

(PIPE)

THERMISTOR

(OUTDOOR)

THERMISTOR

(HEAT SINK)

BROWN

BLACK

BLACK

BLUE

CN25 CN26 CN23 CN22 CN21

1 21 21 21 2

Refer to error code table.

THERMISTOR

(COMPRESSOR)

BROWN

1 2

Thermistor Characteristics (Approx. value)

If Thermistor is either open or shorted, replace it and reset the power.

50

Resistance Value (k )

403020100-30 -20 -10Temperature(°C)

Resistance Value (k )

70 8060Temperature(°C)

224.3 115.2 62.3 35.2 20.7 12.6 8.0 5.2

3.5 2.4 1.6 1.2

Trouble shooting 21

OUTDOOR UNIT Error Method:

Indicate or Display:

Detective Actuators:

Detective details:

Forecast of Cause :

Check Point 2 :

Check Point 3 :

OKOK

OKOK

2-way valve thermistor error

Outdoor unit Main PCB
2-way valve temperature thermistor

When the 2-way valve temperature thermistor open or short-circuit is
detected at power ON or while running the compressor.

1. Connector connection failure 2.Thermistor failure 3. Main PCB failure

Check Point 1 : Check connection of Connector

Check if connector is removed.

Check erroneous connection.
Check if thermistor cable is open.

>>Upon correcting the removed connector or mis-wiring, reset the power.

Check Point 2 : Remove connector and check Thermistor resistance value

Check Point 3 : Check voltage of Main PCB (DC5.0V)

Make sure circuit diagram of outdoor unit and check terminal voltage at Thermistor (DC5.0V)

If the voltage does not appear, replace Main PCB.

02-24

BLACK
RED
RED
RED
RED
RED
RED
RED

GRAY

BROWN

BLACK

BLUE

YELLOW

RED

BLACK
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE

RED

WHITE

1
2
3
4
5
6
7
8

1

2

3

4

5
6
7
8

1
2
3
4
5
6
7
8

1

2
3
4
5
6
7
8

1
2
3
4
5
6
7
8

9

1
4

5
6
7
8
9

CN40

CN39

VALVE THERMISTOR A, B

2-WAY VALVE A

3-WAY VALVE A

2-WAY VALVE B

3-WAY VALVE B

VALVE THERMISTOR D (For AOG30LAT4)

2-WAY VALVE C

3-WAY VALVE C

ORANGE

GREEN

2-WAY VALVE D

3-WAY VALVE D

Refer to error code table.

Thermistor Characteristics (Approx. value)

If Thermistor is either open or shorted, replace it and reset the power.

40

Resistance Value (k )

3020100-10-30 -20Temperature(°C)

Resistance Value (k )

60

70 80

50

Temperature(°C)

1131.9 579.6 312.3 176.0 103.3 62.9 39.6 25.6

17.1 11.6 8.1 5.8

Trouble shooting 22

OUTDOOR UNIT Error Method:

Indicate or Display:

Detective Actuators:

Detective details:

Forecast of Cause :

Check Point 2 :

Check Point 3 :

OKOK

OKOK

3-way valve thermistor error

Outdoor unit Main PCB
3-way valve temperature thermistor

When the 3-way valve temperature thermistor open or short-circuit is
detected at power ON or while running the compressor.

1. Connector connection failure 2.Thermistor failure 3. Main PCB failure

Check Point 1 : Check connection of Connector

Check if connector is removed.

Check erroneous connection.
Check if thermistor cable is open.

>>Upon correcting the removed connector or mis-wiring, reset the power.

Check Point 2 : Remove connector and check Thermistor resistance value

Check Point 3 : Check voltage of Main PCB (DC5.0V)

Make sure circuit diagram of outdoor unit and check terminal voltage at Thermistor (DC5.0V)

If the voltage does not appear, replace Main PCB.

02-25

BLACK
RED
RED
RED
RED
RED
RED
RED

GRAY

BROWN

BLACK

BLUE

YELLOW

RED

BLACK
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE

WHITE

RED

WHITE

1
2
3
4
5
6
7
8

1

2

3
4
5
6
7
8

1
2
3
4
5
6
7
8

1
2
3
4
5
6
7
8

1
2
3
4
5
6
7
8

9

1
4

5
6
7
8
9

CN40

CN39

VALVE THERMISTOR A, B

2-WAY VALVE A

3-WAY VALVE A

2-WAY VALVE B

3-WAY VALVE B

VALVE THERMISTOR D (For AOG30LAT4)

2-WAY VALVE C

3-WAY VALVE C

ORANGE

GREEN

2-WAY VALVE C

3-WAY VALVE C

Refer to error code table.

Thermistor Characteristics (Approx. value)

If Thermistor is either open or shorted, replace it and reset the power.

40

Resistance Value (k )

3020100-10-30 -20Temperature(°C)

Resistance Value (k )

60

70 80

50

Temperature(°C)

1131.9 579.6 312.3 176.0 103.3 62.9 39.6 25.6

17.1 11.6 8.1 5.8

Trouble shooting 23

OUTDOOR UNIT Error Method:

Indicate or Display:

Detective Actuators:

Detective details:

Forecast of Cause :

Check Point 2 :

Check Point 3 :

OKOK

OKOK

Heat sink thermistor error

Outdoor unit Main PCB
Heat sink temperature thermistor

When the heat sink temperature thermistor open or short-circuit is
detected at power ON or while running the compressor.

1. Connector connection failure 2.Thermistor failure 3. Main PCB failure

Check Point 1 : Check connection of Connector

Check if connector is removed.

Check erroneous connection.
Check if thermistor cable is open.

>>Upon correcting the removed connector or mis-wiring, reset the power.

Check Point 2 : Remove connector and check Thermistor resistance value

Check Point 3 : Check voltage of Main PCB (DC5.0V)

Make sure circuit diagram of outdoor unit and check terminal voltage at Thermistor (DC5.0V)

If the voltage does not appear, replace Main PCB.

02-26

THERMISTOR

(DISCHARGE)

THERMISTOR

(PIPE)

THERMISTOR

(OUTDOOR)

THERMISTOR

(HEAT SINK)

BROWN

BLACK

BLACK

BLUE

CN25 CN26 CN23 CN22 CN21

1 21 21 21 2

Refer to error code table.

THERMISTOR

(COMPRESSOR)

BROWN

1 2

40

Resistance Value (k )

3020100-10-30 -20Temperature(°C)

Resistance Value (k )

60

70 80 90 100

50

Temperature(°C)

92.3 49.2 27.5 16.1 9.7 6.1 3.9 2.6

1.8 1.2 0.9 0.6 0.5 0.4

Thermistor Characteristics (Approx. value)

If Thermistor is either open or shorted, replace it and reset the power.

Trouble shooting 24

INDOOR UNIT

OUTDOOR UNIT Error Method:

Indicate or Display:

Detective Actuators:

Detective details:

Forecast of Cause :

Check Point 3 : Check Point 2 : Check voltage of Main PCB (DC5.0V)

PRESSURE SWITCH 1

RED
RED

CN37

1
2

PRESSURE SWITCH 2

WHITE
WHITE

CN36

1
2

Check Point 1 : Reset power supply and operate

Check Point 3 : Check Pressure switch

YESYES

NONO

High pressure switch error

Outdoor unit Main PCB
Pressure switch

1. Connector connection failure 2. Pressure switch failure 3. Main PCB failure

When the pressure switch open is detected in 10 seconds
after the power is turned on.

Does abnormal LED indication show again?

Make sure circuit diagram of outdoor unit and check terminal voltage
at Pressure switch. (DC5.0V)

If the voltage does not appear, replace Main PCB.

Check if connector is loose or cable is open.

>> If no abnormal connection is found,

replace Pressure Switch.
After replacing Pressure switch, check operating

condition and pressure in operation.

02-27

Refer to error code table.

OK

PRESSURE SWITCH 1 (CN37)

Pressure switch 1

4.2 0.1MPa

3.2 0.15MPa

Contact : Short Open
Contact : Open Short

Characteristics of pressure switch

PRESSURE SWITCH 2 (CN36)

Pressure switch 2

3.7 MPa

2.9 0.2MPa

Contact : Short Open
Contact : Open Short

+0

0.2

-

02-28

Trouble shooting 25
OUTDOOR UNIT Error Method:

Indicate or Display:

Over current error

Refer to error code table.

Detective Actuators:

Detective details:

Outdoor unit Main PCB
Compressor

When more than normal operating current to IPM in Main PCB flows,
the compressor stops.
After the compressor restarts, if the same operation is repeated
within 40sec, the compressor stops again.
If and repeats 5 times, the compressor stops permanently.

Forecast of Cause :

Check Point 3 : Check Outdoor fan

OK

OK

Check Point 5 : Replace Main PCB

OK

OK

Check Point 1 : Check connections of Outdoor unit electrical components

1. Defective connection of electric components 2. Outdoor fan operation failure

3. Outdoor heat exchanger clogged 4. Compressor failure 5. Main PCB failure

Check if connector is removed.

Check if the terminal connection is loose.

Check erroneous connection.
Check if cable is open.

>>Upon correcting the removed connector or mis-wiring, reset the power.

Check Point 2 : Check Outdoor fan, Heat exchanger

Is there anything obstructing the air distribution circuit?
Is there any clogging of Outdoor Heat Exchanger?

Is the Fan rotating by hand when operation is off ?

>> If the fan motor is locked, replace it.

Check Outdoor fan motor. (Refer to Trouble shooting 27)

>> If the fan motor is failure, replace it.

Check Point 4 : Check Compressor

Check Compressor. (PARTS INFORMATION 2)

If Check Point 1 ~ 4 do not improve the symptom, change Main PCB.

Trouble shooting 26
OUTDOOR UNIT Error Method:

Compressor control error

02-29

Detective Actuators:

Detective details:

Forecast of Cause :

Check Point 1 : Check connection of around the Compressor components

Check Point 2: Replace Main PCB

Outdoor unit Main PCB
Compressor

1. Defective connection of electric components 2. Main PCB failure 3. Compressor failure

If Check Point 1 do not improve the symptom, change Main PCB.

Check if connector is removed.
Check erroneous connection.
Check if cable is open.

>>Upon correcting the removed connector or mis-wiring, reset the power.

(Refer to PARTS INFORMATION 2)

For Compressor Terminal, Main PCB

While running the compressor, if the detected rotor location is out of
phase with actual rotor location more than 90°,
the compressor stops.
After the compressor restarts, if the same operation is repeated
within 40sec, the compressor stops again.
If and repeats 5 times, the compressor stops permanently.

OKOK

Check Point 3: Replace Compressor

If Check Point 2 do not improve the symptom, change Compressor.

OKOK

Indicate or Display:

Refer to error code table.

02-30

Trouble shooting 27

OUTDOOR UNIT Error Method:

Detective Actuators:

Detective details:

Forecast of Cause:

Check Point 3 : Check Outdoor unit fan motor

OK

OK

Outdoor unit fan motor error

Outdoor unit Main PCB
Outdoor unit fan motor

1. Fan rotation failure 2. Motor protection by surrounding temperature rise 3. Main PCB failure

4. Outdoor unit fan motor failure

Check Point 1 : Check rotation of Fan

Rotate the fan by hand when operation is off.
(Check if fan is caught, dropped off or locked motor)

>>If Fan or Bearing is abnormal, replace it.

Check Outdoor unit fan motor. (PARTS INFORMATION 5)
>>If Outdoor Fan Motor is abnormal, replace Outdoor fan motor and Main PCB.

Check Point 4 : Check Output Voltage of Main PCB

Check outdoor unit circuit diagram and the voltage. (Measure at Main PCB side connector)

If the voltage is not correct, replace Main PCB.

When outdoor fan rotation speed is less than 100rpm in 20 seconds
after fan motor starts, fan motor stops.
After fan motor restarts, if the same operation within 60sec is repeated
3 times in a row, compressor and fan motor stops.
If and repeats 5 times in a row, compressor and fan motor stops
permanently.

Read wire DC voltage
Red - Black

White - Black

15 1.5V

CN800

1
2
3
4
5
6
7

BLACK
WHITE
YELLOW
BROWN

RED

FM

FAN MOTOR

Check Point 2 : Check ambient temp. around motor

OK

Check excessively high temperature around the motor.
(If there is any surrounding equipment that causes heat)

>>Upon the temperature coming down, restart operation.

Indicate or Display:

Refer to error code table.

280V (AC220V-10%) ~ 373V (AC240+10%)

Detective Actuators:

Detective details:

Forecast of Cause :

OKOK

1. Connector connection failure 2. Thermistor failure 3. Coil failure 4. 4-way valve failure

5. Main PCB failure 6. Controller PCB failure

Check Point 1 : Check connection of Connector

Check if connector is removed.
Check erroneous connection.
Check if thermistor cable is open.

>> Upon correcting the removed connector or mis-wiring, reset the power.

Check Point 3 : Check the solenoid coil and 4-way valve

02-31

[ Solenoid coil ]
Remove CN30 from PCB and check the resistance value of coil.
Resistance value is about 1.4k

>> If it is Open or abnormal resistance value, replace Solenoid Coil.

[ 4-way valve ]
Check each piping temperature,
and the location of the valve by the temperature difference.
>> If the value location is not proper, replace 4-way valve.

Check Point 5 : Replace Controller PCB

If Check Point 1- 4 do not improve the symptom, replace Controller PCB of Indoor unit .

Check Point 2 : Check thermistor of Indoor unit

Isn’t it fallen off the holder?
Is there a cable pinched?

>> Check characteristics of thermistor, (Refer to Trouble shooting 7,8),
If defective, replace the thermistor.

Indoor unit Controller PCB
Heat exchanger temperature thermistor
Room temperature thermistor
4-way valve

When the indoor heat exchanger temperature is compared with
the room temperature, and either following condition is detected
continuously two times, the compressor stops.
Cooling or Dry operation
[Indoor heat exchanger temp.] - [Room temp.] > 10

°C

Heating operation
[indoor heat exchanger temp.] - [Room temp.] < -10

°C

If the same operation is repeated 5 times,
the compressor stops permanently.

Trouble shooting 28
OUTDOOR UNIT Error Method:

4-way valve error

Indicate or Display:

Refer to error code table.

Check Point 4 : Check the voltage of 4-way valve

Check the CN 30 voltage of Main PCB

Check if AC198V(AC220V-10%) - 264V(AC240V+10%) appears at CN 30 of Main PCB.

[ Heating operation ]

>> If it is not voltage, Replace Main PCB.

[ Cooling operation ]

>> If it is voltage, Replace Main PCB.

OKOK

OKOK

OKOK

<Cooling operation>

OK

OK

OK

OK

OK

<Heating operation>

Outdoor unit Main PCB
Discharge temperature thermistor

"Protection stop by "discharge temperature 110°C (18,24type) /
115°C (30type) during compressor operation"" generated 2 times
within 24 hours.

Check Point 1 : Check if 3-way valve(gas side) is open.

Discharger thermistor characteristics check.
(Check by disconnecting thermistor from PCB.)

* For the characteristics of the thermistor, refer to the "Trouble shooting 17".

Check Point 4 : Check the discharge thermistor

Check Point 3 : Check the outdoor unit fan,heat exchanger

Check for foreign object at heat exchanger
Check if fan can be rotated by hand.
Motor check (PARTS INFORMATION 5)

Check Point 5 : Check the refrigerant amount

Leak check

If the 3-way valve(gas side) was closed, open the
3-way valve(gas side) and check operation.

02-32

Check Point 1 : Check if 3-way valve(liquid side) is open.

If the 3-way valve(liquid side) was closed, open the
3-way valve(liquid side) and check operation.

OK

Detective Actuators:

Detective details:

Forecast of Cause :

Trouble shooting 29
OUTDOOR UNIT Error Method:

Discharge temp. error

Indicate or Display:

Refer to error code table.

1. 3-way valve not opened 2. EEV defective, strainer clogged

3. Outdoor unit operation failure, foreign matter on heat exchanger

4. Discharge temperature thermistor failure 5. Insufficient refrigerant

6. Main PCB failure

EEV open?
Strainer clogging check

(Refer to PARTS INFORMATION 3)

Check Point 2 : Check the EEV, strainer

EEV open?
Strainer clogging check

(Refer to PARTS INFORMATION 3)

Check Point 2 : Check the EEV, strainer

<Cooling operation>

OK

OK

OK

OK

OK

<Heating operation>

Compressor temperature thermistor

"Protection stop by
"compressor temperature 110°C (18,24type)/ 125°C (30type)
during compressor operation"" generated 2 times within 24 hours.

Check Point 1 : Check if 3-way valve(gas side) is open.

Discharger thermistor characteristics check
(Check by disconnecting thermistor from PCB.)

* For the characteristics of the thermistor, refer to the "Trouble shooting 17".

Check Point 4 : Check the discharge thermistor

EEV open?
Strainer clogging check

(Refer to PARTS INFORMATION 3)

Check Point 3 : Check the outdoor unit fan,heat exchanger

Check for foreign object at heat exchanger
Check if fan can be rotated by hand.
Motor check (PARTS INFORMATION 5)

Check Point 2 : Check the EEV, strainer

Check Point 5 : Check the refrigerant amount

Leak check

EEV open?
Strainer clogging check

(Refer to PARTS INFORMATION 3)

Check Point 2 : Check the EEV, strainer

If the 3-way valve(gas side) was closed, open the
3-way valve(gas side) and check operation.

02-33

Check Point 1 : Check if 3-way valve(liquid side) is open.

If the 3-way valve(liquid side) was closed, open the
3-way valve(liquid side) and check operation.

OK

Detective Actuators:

Detective details:

Forecast of Cause :

Trouble shooting 30
OUTDOOR UNIT Error Method:

Compressor temp. error

Indicate or Display:

Refer to error code table.

1. 3-way valve not opened 2. EEV defective, strainer clogged

3. Outdoor unit operation failure, foreign matter on heat exchanger

4. Compressor temperature thermistor failure 5. Insufficient refrigerant

6. Main PCB failure

Trouble shooting 31

Forecast of Cause:

OKOK

Indoor Unit - No Power

1. Power supply failure 2. External cause

3. Electrical components defective

Check Point 1 : Check Installation condition

Isn’t the breaker down?
Check loose or removed connection cable.

>>If abnormal condition is found, correct it by referring
to Installation Manual or Data & Technical manual.

02-34

2-3 TROUBLE SHOOTING WITH NO ERROR CODE

Check Point 3 : Check Electrical components

YESYES

Check the voltage of power supply.

>> Check if AC198 - 264V appears at Outdoor Unit Terminal L - N.

Check Varistor in Filter PCB.

>> If Varistor is defective, there is a possibility of an abnormal power supply.
Check the correct power supply and replace Varistor.
Upon checking the normal power supply, replace Varistor.

OK

Check Fuse of between of Terminal and Filter PCB.

>> If Fuse is open, check if the wiring between Terminal and Filter PCB
is loose, and replace Fuse.

Check Point 4 : Replace Filter PCB

If Check Point 1- 3 do not improve the symptom, replace Filter PCB.

OK

Check Point 2 : Check external cause at Indoor and Outdoor (Voltage drop or Noise)

Instant drop ----- Check if there is a large load electric apparatus in the same circuit.
Momentary power failure ----- Check if there is a defective contact or leak current in the power supply circuit.
Noise ----- Check if there is any equipment causing harmonic wave near electric line.

(Neon bulb or electric equipment that may cause harmonic wave)
Check the complete insulation of grounding.

Trouble shooting 32

Forecast of Cause:

Check Point 3 : Check Electrical components

OKOK

OKOK

YESYES

YESYES

OK

Check Point 1 : Check Installation Condition

Outdoor Unit - No Power

1. Power supply failure 2. External cause

3. Electrical components defective

Isn’t the breaker down?
Check loose or removed connection cable.

>>If abnormal condition is found, correct it by referring
to Installation Manual or Data & Technical manual.

Check Point 2 : Check external cause at Indoor and Outdoor (Voltage drop or Noise)

Instant drop ----- Check if there is a large load electric apparatus in the same circuit.
Momentary power failure ----- Check if there is a defective contact or leak current in the power supply circuit.
Noise ----- Check if there is any equipment causing harmonic wave near electric line.

(Neon bulb or electric equipment that may cause harmonic wave)
Check the complete insulation of grounding.

Check the voltage of power supply.

>> Check if AC198 - 264V appears at Outdoor Unit Terminal L - N.

Check Fuse in Main PCB.

>> If Fuse is open, check if the wiring between Terminal and Main PCB is loose,
and replace Fuse.

Check Active filter module. (PARTS INFORMATION 6)

>> If Active filter module is abnormal, replace it.

02-35

Check Point 4 : Replace Main PCB

If Check Point 1- 3 do not improve the symptom, replace Main PCB.

Trouble shooting 33

Forecast of Cause:

Check Point 2 : Check external cause at Indoor and Outdoor (Voltage drop or Noise)

Check Point 1 : Check indoor and outdoor installation condition

Check Point 3 : Check Wired Remote Controller and Controller PCB

OK

OK

OKOK

No Operation (Power is ON)

1. Setting/ Connection failure 2. External cause

3. Electrical Component defective

Indoor Unit - Check incorrect wiring between Indoor Unit - Remote Control.
Or, check if there is an open cable connection.
Are these Indoor unit, Outdoor unit, and Remote control suitable model numbers to connect?

>> If there is some abnormal condition, correct it by referring to Installation manual and
Data & Technical manual.

Turn off Power and check/ correct followings.

Is there loose or removed communication line of Indoor unit and Outdoor unit?

Instant drop ----- Check if there is a large load electric apparatus in the same circuit.
Momentary power failure ----- Check if there is a defective contact or leak current in the power supply circuit.
Noise ----- Check if there is any equipment causing harmonic wave near electric line.

(Neon bulb or electric equipment that may cause harmonic wave)
Check the complete insulation of grounding.

>> If it is DC12V, Remote Control is failure. (Controller PCB is normal) >> Replace Remote Control
>> If it is DC 0V, Controller PCB is failure. (Check Remote Control once again)
>> Check Indoor unit fan motor. (PARTS INFORMATION 4)
If it is normal, replace Controller PCB.
If it is abnormal, replace Indoor unit fan motor and Controller PCB.

>> If the symptom does not change by above Check 1, 2, 3, replace Main PCB of Outdoor unit.

02-36

Check Voltage at terminal 1-3 of Controller PCB or Communication PCB.
(Power supply to Remote Control)
Cassette, Duct, Universal Floor/Ceiling Type : CN14
Wall mount, Floor Type : CN6
Conpact Wall mount Type : CN305 (UTY-XCBXZ1)

Attention

Trouble shooting 34

Forecast of Cause:

Check Point 2 : Check Outdoor unit operation

Check Point 1 : Check Indoor unit

Check Point 3 : Check Site condition

Check Point 5 : Check Refrigeration cycle

Check Point 4 :
Check Indoor/ Outdoor installation condition

Pipe (In) Pipe (Out)

Pipe (In) Pipe (Out)

OKOK

OKOK

OKOK

OKOK

MPa MPa

No Cooling / No Heating

1. Indoor unit error 2. Outdoor unit error

3. Effect by Surrounding environment

4. Connection pipe / Connection wire failure 5. Refrigeration cycle failure

Does indoor unit fan run on high fan?

Is air filter dirty?

Is heat exchanger clogged?
Check if energy save function is operated.

Check if outdoor unit is operating
Check any objects that obstruct the air flow route.
Check clogged Heat exchanger.
Is the valve open?

Is capacity of Indoor unit fitted to room size?

Any windows open? Or direct sunlight ?

Check connection pipe
(specified pipe length & Pipe diameter?)

Check any loose or removed communication line.

>> If there is an abnormal condition, correct it by
referring to Installation Manual or Data & Technical
manual.

Check if strainer is clogged (Refer to the figure at right).

Measure gas pressure and if there is a leakage, correct it.

>> When recharging the refrigerant, make sure to perform
vacuuming, and recharge the specified amount.

Check EEV (PARTS INFORMATION 3)

Check Compressor (PARTS INFORMATION 1,2)

Strainer normally does not have temperature difference
between inlet and outlet as shown in , but if there is a
difference like shown in , there is a possibility of inside
clogged. In this case, replace Strainer.

02-37

Trouble shooting 35

Forecast of Cause :

Trouble shooting 36

Forecast of Cause:

OK

OK

OK

OK

OKOK

OKOK

OKOK

MPa MPa

Abnormal noise

1. Abnormal installation (Indoor/ Outdoor)

2. Fan failure (Indoor/ Outdoor)

3. Compressor failure (Outdoor)

Diagnosis method when Abnormal noise is occurred

Abnormal noise is coming from Indoor unit.
(Check and correct followings)

Abnormal noise is coming from outdoor unit.
(Check and correct followings)

Is fan broken or deformed?
Is the screw of fan loose?
Is there any object which obstruct the fan rotation?

Is Main unit installed in stable condition?
Is the installation of air suction grille and
front panel normal?

Is fan broken or deformed?
Is the screw of Fan loose?

Is there any object which obstruct the fan rotation?

Is Main unit installed in stable condition?
Is fan guard installed normally?

Check if vibration noise by loose bolt or contact noise
of piping is happening.

Is Compressor locked?

>> Check Compressor (PARTS INFORMATION 1,2)

Water leaking

1. Erroneous installation 2. Drain hose failure

Diagnosis method when water is spitting out.

Is the filter clogged?

Check gas pressure and correct it
if there was a gas leak.

Diagnosis method when water leak occurs

Is Drain hose connection loose?

Is there a trap in drain hose?

Is drain hose clogged?

Is Main unit installed in stable condition?

Is Main unit broken or deformed at the time of

transportation or maintenance?

Is fan rotating?

02-38

SERVICE PARTS INFORMATION 1

MPa MPa

Compressor

Diagnosis method of Compressor ( If outdoor Unit LED displays Error, refer to Trouble shooting )

Does not start up

Is there open or loose connection
cable?

Check Filter PCB, Main PCB,
connection of Compressor,and winding
resistance. (Refer to the next page).

Check Filter PCB, Main PCB,
connection of Compressor,and winding
resistance. (Refer to the next page).

>> If there is no failure, the defect of
Compressor is considered (Locked
compressor due to clogged dirt or
less oil)

Replace Compressor

Replace Compressor

Replace Compressor

Stops soon after starting up

Is there open or loose connection
cable?

Is gas pipe valve open?
(Low pressure is too low)

Check if refrigerant is leaking.
(Recharge refrigerant)

Check if strainer is clogged.
(PARTS INFORMATION 3)

>> If there is no failure, the defect of Compressor can be
considered. (Compressor part broken or valve defective.)

Abnormal noise

Defective Compressor
can be considered.
(due to inside dirt clogging
or broken component)

Check if vibration noise by
loose bolt or contact noise
of piping is happening.

02-39

2-4 SERVICE PARTS INFORMATION

SERVICE PARTS INFORMATION 2

Check Point 1 : Check Connection

Check Point 2 : Check Winding Resistance

Check Point 3 : Replace Main PCB

U(R)

V(S)

W (T)

Inverter Compressor

Check terminal connection of Compressor
(loose or incorrect wiring)

Check winding resistance of each terminal

If the resistance value is 0 or infinite, replace Compressor.

If the symptom does not change with above Check 1, 2, replace Main PCB.

02-40

U(R)

(RED)

V(S)

(WHITE)

W (T)

(BLACK)

Main PCB

Resistance Value : 0.97 at 20°C

Resistance Value : 0.88 at 20°C

For AO*G18/ 24LAT3

For AO*G30LAT4

SERVICE PARTS INFORMATION 3

Check Point 1 : Check Connections

Outdoor unit Electronic Expansion Valve
( EEV )

Check connection of connector

( Loose connector or open cable )

02-41

EXPANSION
VALVE COIL A

EXPANSION
VALVE COIL B

EXPANSION
VALVE COIL C

CN27

CN50

CN51

RED

WHITE

YELLOW

ORANGE

BLUE

BROWN

RED

BLACK
WHITE
WHITE
WHITE

WHITE
WHITE

BROWN
BLUE
ORANGE

YELLOW

WHITE

WHITE

GREEN

BLACK

GREEN
GREEN
GREEN
GREEN

RED
BROWN
BLUE
ORANGE

YELLOW

WHITE

GREEN

1
2
3
4
5
6

1
2
3
4
5
6

1
2
3
4
5
6

1

2
3
4
5
6

1
2
3
4
5
6

2

1

1
3

4
5
6
7

4
5

6
7

E V

E V

E V

For AO*G18/ 24LAT3

EXPANSION
VALVE COIL A

EXPANSION
VALVE COIL B

EXPANSION
VALVE COIL C

EXPANSION
VALVE COIL D

CN27

CN50

CN51

RED

WHITE

YELLOW

ORANGE

BLUE

BROWN

RED

BLACK
WHITE
WHITE
WHITE
WHITE
WHITE

BROWN
BLUE
ORANGE
YELLOW
WHITE

WHITE

GREEN

BLACK

GREEN
GREEN
GREEN
GREEN

RED
BROWN
BLUE
ORANGE
YELLOW
WHITE

GREEN

1
2
3
4
5
6

1
2
3
4
5
6

1
2
3
4
5
6

1
2
3
4
5
6

1

2
3
4
5
6

2

1

1

3

4

5

6
7

4

5

6

7

E V

E V

E V

CN52

BLUE
BLUE
BLUE
BLUE
BLUE

BLACK

RED
BROWN
BLUE
ORANGE
YELLOW
WHITE

GREEN

1
2
3
4
5
6

1
2
3
4
5
6

1

3

4

5

6

7

E V

For AO*G30LAT4

Check Point 5 : Check Opening and Closing operation of valve

Pipe (In)

Pipe (Out)

Pipe (In)

CLOSE
Example : Hot gas

OPEN
Example : Hot gas

Pipe (Out)

Pipe (In) Pipe (Out)

Pipe (In) Pipe (Out)

Check Point 6 : Check strainer

When Valve is closed,
it has a temp. difference between Inlet and Outlet.

If it is open,
it has no temp. difference between Inlet and Outlet.

Strainer normally does not have temperature difference between inlet and outlet as shown in ,
but if there is a difference as shown in , there is a possibility of inside clogged. In this case, replace Strainer.

02-42

Check Point 2 : Check Coil of EEV

Yellow - Brown
Orange - Red
Blue - Brown

White - Red

Read wire

46

4

Resistance value

Check Point 3 : Check voltage from Main PCB.

Check Point 4 : Check noise at start up

DC

at 20°C

Remove connector, check each winding
resistance of Coil.

If resistance value is abnormal, replace EEV.

Remove connector and check voltage (DC12V)

If it does not appear, replace Main PCB.

Turn on Power and check operation noise.

If an abnormal noise does not show, replace Main PCB.

SERVICE PARTS INFORMATION 5

Check Point 1 : Check rotation of fan

Outdoor unit fan motor

Rotate the fan by hand when operation is off.
(Check if fan is caught, dropped off or locked motor)

>>If Fan or Bearing is abnormal, replace it.

Check Point 2 : Check resistance of outdoor fan motor

Refer to below. Circuit-test "Vm" and "GND" terminal.
(Vm: DC voltage, GND: Ground terminal)

>>If they are short-circuited (below 300 k ), replace Outdoor fan motor and Main PCB.

Pin number
(wire color)

Terminal function
(symbol)

1 (Red)
2
3
4 (Black)
5 (White)
6 (Yellow)
7 (Brown)

DC voltage (Vm)
No function
No function
Ground terminal (GND)
Control voltage (Vcc)
Speed command (Vsp)
Feed back (FG)

SERVICE PARTS INFORMATION 4

Check Point 1 : Check rotation of fan

Indoor unit fan motor

Rotate the fan by hand when operation is off.
(Check if fan is caught, dropped off or locked motor)

>>If fan or bearing is abnormal, replace it.

Check Point 2 : Check resistance of indoor fan motor

Refer to below. Circuit-test "Vm" and "GND" terminal.
(Vm: DC voltage, GND: Ground terminal)

>>If they are short-circuited (below 300 k ), replace Indoor fan motor and Controller PCB.

Pin number
(wire color)

Terminal function
(symbol)

1 (Blue)
2 (Yellow)
3 (White)
4 (Black)
5
6 (Red)

Feed back (FG)
Speed command (Vsp)
Control voltage (Vcc)
Ground terminal (GND)
No function
DC voltage (Vm)

02-43

Pin number
(wire color)

Terminal function
(symbol)

1 (Brown)
2 (Yellow)
3 (White)
4 (Black)
5
6 (Red)

Feed back (FG)
Speed command (Vsp)
Control voltage (Vcc)
Ground terminal (GND)
No function
DC voltage (Vm)

For Cassette, Duct, Universal Floor/Ceiling TypeFor Wall Mount, Conpact Wall Mount,Floor Type

SERVICE PARTS INFORMATION 6

Active filter module

02-44

Check Point 1 : Check Open or Short-circuit and Diode (D1)

Check Point 2 : Check the Output DC voltage (between P and N)

L2L1

P

N

+IN

Check the output DC voltage (between P and N) of compressor stopping and operating.

If it is abnormal,replace Active filter module.

Remove connector, check the open or short-circuit and the diode in the module

>> If the output voltage of compressor operating is less than the output voltage of compressor stopping,
Active filter module is detective. >> Replace Active filter module.

Terminal

Resistance value

L2

L1

L1,L2

P

P

Control box

N

N

(+IN)

(+IN)

( IN)

( IN)

Tester(+) Tester(-)

Check the open or short-circuit

L2

P

P

N

L2

L2

Check the diode

0

360k

720k

1.69M /

20%

+

-

20%

+

-

360k

20%

+

-

(Ref. value 1)

1.88M

(Ref. value 2)

1.40M /

(Ref. value 1)

2.28M

(Ref. value 2)

Terminal

Resistance value

Tester(+) Tester(-)

1.32M /

(Ref. value 1)

1.50M

(Ref. value 2)

1.40M /

(Ref. value 1)

1.51M

(Ref. value 2)

Ref. value 1
Specifications for Multimeter
Manufacturer : HIOKI
Model name : 3804
Power source : DC9V.

Ref. value 2
Specifications for Multimeter
Manufacturer : YOKOGAWA
Model name : 7534
Power source : DC3V.

-IN

By kind of tester, the value may change significantly.











3 . REPLACEMENT PARTS

R410A

INVERTER (MULTI )

Universal Floor / Celling
Slim Duct / Compact Cassette
Compact Wall Mounted /
Wall Mounted / Floor type

ACTPM

Compressor

4-way valve

3-1 AO*G18/ 24LAT3

3-1-1 PARTS LAYOUT DRAWING

03-01

Motor DC Brushless

Propeller Fan assy

Condenser A assy

Coil (Expansion valve)&
Expansion valve

Solenoid

Pressure SW

Choke Coil

Accumulator

Main PCB

Filter PCB

Thermistor
(Heat exchanger temp.)

2-way valve assy
(Liquid)

3-way valve assy
(Gas)

03-02

Thermo Holder&
Thermistor (Outdoor Temp.)

1. Service Panel sub assy removal

Remove the 2 mounting screws.
Remove the Service Panel sub assy by sliding downward.

2. Top Panel sub assy removal

Remove the 7 mounting screws.
Remove the Top Panel sub assy upward.

FRONT VIEW REAR VIEW

3-1-2 DISASSEMBLY PROCESS (AO*G18/ 24LAT3)

03-03

Replaceable Component

Compressor
Accumulator
4-way valve
Solenoid
Thermistor (Compressor temp.)
Thermistor (Discharge temp.)
Thermistor (Outdoor temp.)
Thermistor (Heat exchanger temp.)
Thermistor (2/3-way valve temp.)
Pressure SW
Coil (Expansion valve)

Hook
(3 places)

Service Panel sub assy

Top Panel sub assy

3. Inverter Box removal

Remove the 6 mounting screws.
Remove the power supply & connection cord.
Remove the connectors connected to Main PCB. (Thermistor, EEV, and so on)
Remove the Inverter Box upward.

03-04

Inverter Box

REAR VIEW

FRONT VIEW

03-05

Remove the 1 mounting screw.
Remove the Inverter Box Cover upward.

Hook (2 places)

Inverter Box Cover

4. Inverter Box Cover removal

5. Main PCB removal

03-06

A

D

B

C

Remove the 4 mounting screws. (Refer to VIEW -A)
Remove the wires from terminal. (Refer to VIEW -B)
Remove the wires. (Refer to VIEW -C, -D)
Remove the Main PCB.

Hook

Screw

Screw

(IPM)

Screw

(Diode Bridge)

VIEW - A

VIEW - B

Red Yellow Pink

Main PCB

03-07

VIEW - C

VIEW - D

CN34(Yellow)

TM101(Black) TM102(White)

CN1(White)

Main PCB

Filter PCB

03-08

VIEW - E

Spread the heat dissipation compound
on the other side of IPM and Diode Bridge,
when you exchange Main PCB by the repair.

IPM

Diode Bridge

E

Precautions for exchange of Main PCB

6. Filter PCB removal

03-09

Remove the 2 mounting screws. (Refer to VIEW -A)
Remove the wires from terminal and fuse holder. (Refer to VIEW -B)
Remove the Filter PCB.

Hook

Screw

VIEW - A

VIEW - B

White

Black

Black

Black

Filter PCB

A

B

7. ACTPM removal

03-10

Remove the connectors and cords. (Refer to VIEW -F)
Remove the 2 mounting screws. (Refer to VIEW -F)
Remove the ACTPM (Active Filter Module).

VIEW - F

CN407

" P " (Yellow)

" N1 " (Blue)

" - " (Black)

" + " (Red)

" L1 " (White)

Twist 4 times or more 2 turn the Wire this way

" L2 " (Brown)

Thermistor (Heat sink)

Screw

Spread the heat dissipation compound
on the other side of ACTPM,
when you exchange ACTPM by the repair.

F

8. Valve Cover sub assy removal

Remove the 3 mounting screws.
Remove the Valve Cover sub assy.

9. Thermo Holder removal

Remove the 1 mounting screw.
Remove the Thermo Holder by sliding upward.

03-11

Valve Cover sub assy

Thermo Holder

Hook

10. Right Panel sub assy removal

Remove the 13 mounting screws.

Remove the Right Panel sub assy by sliding upward.

03-12

Right Panel sub assy

Hook

3-2 AO*G30LAT4

3-2-1 PARTS LAYOUT DRAWING

03-13

Main PCB

Filter PCB

Active Filter Module

Thermistor (Heat sink)

Fan motor

Fan

Heat Exchanger

Accumulator

Compressor

4-way valve

Solenoid

Thermistor
(Compressor temp.)

Coil(Expansion valve)&
Expansion valve

Choke coil

Receiver tank

03-14

Thermistor (Heat exchanger temp.)

Pressure SW

2-way valve
(Liquid)

3-way valve
(Gas)

Thermo Holder&
Thermistor (Outdoor Temp.)

1. Service Panel sub assy removal

2. Top Panel sub assy removal

3-2-2 DISASSEMBLY PROCESS (AO*G30LAT4)

03-15

Remove the 2 mounting screws.
Remove the SERVICE PANEL by sliding downward.

Replaceable Component

Compressor
Accumulator
4-way valve
Solenoid
Thermistor (Compressor temp.)
Thermistor (Discharge temp.)
Thermistor (Outdoor temp.)
Thermistor (Heat exchanger temp.)
Thermistor (2/3-way valve temp.)
Pressure SW
Coil (Expansion valve)

Hook
(3 places)

Remove the 7 mounting screws.
Remove the TOP PANEL upward.

FRONT VIEW REAR VIEW

3. Inverter Box removal

Remove the 6 mounting screws.
Remove the power supply & connection cord.
Remove the connectors connected to Main PCB. (Thermistor, EEV, and so on)
Remove the Inverter Box upward.

03-16

REAR VIEW

FRONT VIEW

INVERTER BOX

03-17

Remove the 1 mounting screw.
Remove the Inverter Box Cover upward.

4. Inverter Box Cover removal

Hook (2 places)

Inverter Box Cover