Fujitsu AR*G36LMLA, AU*G54LRLA, ARTG36LHTB, AU*G45LRLA, AR*G45LMLA Service Instruction

Models Indoor unit

Single type

Outdoor unit

AU*G36LRLA
AU*G45LRLA
AU*G54LRLA

AR*G36LMLA
ARTG36LHTB
AR*G45LMLA
AR*G45LHTA
ARTG45LHTB
AR*G54LHTA
ARTG54LHTB
ARTG60LHTA

AB*G36LRTA
AB*G45LRTA
AB*G54LRTA

AO* G36LATT
AO* G45LATT
AO* G54LATT
AOTG60LATT

SERVICE
INSTRUCTION

R410A

3 PHASE TYPE
ROOM AIR CONDITIONER

Single /
Simultaneous
operation multi type

Simultaneous
operation multi type

AU*G18LVLB
AU*G22LVLA
AU*G24LVLA

AR*G18LLLA
AR*G22LMLA
AR*G24LMLA

AB*G18LVTB
AB*G22LVTA
AB*G24LVTA

CONTENTS

1. DESCRIPTION OF EACH CONTROL OPERATION

1-1 COOLING OPERATION............................................................................................ 01-01

1-2 HEATING OPERATION............................................................................................ 01-02

1-3 DRY OPERATION..................................................................................................... 01-03

1-4 AUTO CHANGEOVER OPERATION........................................................................ 01-04

1-5 INDOOR FAN CONTROL.......................................................................................... 01-06

1-6 OUTDOOR FAN CONTROL...................................................................................... 01-10

1-7 LOUVER CONTROL.................................................................................................. 01-11

1-8 COMPRESSOR CONTROL....................................................................................... 01-17

1-9 TIMER OPERATION CONTROL............................................................................... 01-18

1-10 ELECTRONIC EXPANSION VALVE CONTROL.................................................... 01-22

1-11 TEST OPERATION CONTROL............................................................................... 01-22

1-12 PREVENT TO RESTART FOR 3 MINUTES............................................................ 01-22

1-13 4-WAY VALVE EXTENSION SELECT.................................................................... 01-23

1-14 AUTO RESTART..................................................................................................... 01-23

1-15 MANUAL AUTO OPERATION................................................................................ 01-23

1-16 PUMP DOWN........................................................................................................... 01-24

1-17 COMPRESSOR PREHEATING............................................................................... 01-25

1-18 DEFROST OPERATION CONTROL....................................................................... 01-25

1-19 OFF DEFROST OPERATION CONTROL............................................................... 01-27

1-20 ECONOMY OPERATION........................................................................................ 01-28

1-21 10°C HEAT OPERATION........................................................................................ 01-28

1-22 VARIOUS PROTECTIONS...................................................................................... 01-28

1-23 FORCED COOLING OPERATION.......................................................................... 01-31

1-24 COMPRESSOR STOP OPERATION...................................................................... 01-31

1-25 FRESH AIR CONTROL........................................................................................... 01-31

1-26 EXTERNAL ELECTRICAL HEATER CONTROL.................................................... 01-31

1-27 DRAIN PUMP OPERATION..................................................................................... 01-32

1-28 LOW NOISE OPERATION....................................................................................... 01-33

1-29 PEAK CUT OPERATION......................................................................................... 01-33

1-31 DEMAND RESPONSE OPERATION....................................................................... 01-39

1-30 DESCRIPTION OF DISPLAY UNIT......................................................................... 01-34

1-9-1 WIRELESS REMOTE CONTROLLER................................................................

01-18

1-30-1 LAYOUT OF DISPLAY UNIT............................................................................

01-34

1-30-2 DISPLAY MODE...............................................................................................

01-35

1-30-3 ERROR HISTORY MODE.................................................................................

01-38

1-30-4 ERROR CHECK MODE....................................................................................

01-39

1-9-2 WIRED REMOTE CONTROLLER.......................................................................

01-20

2-1-1 INDOOR UNIT AND WIRED REMOTE CONTROLLER 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

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

02-02

02-34

02-03

02-39

3. DISASSEMBLY PROCESS

1 . DESCRIPTION OF EACH
CONTROL OPERATION

AIR CONDITIONER

3 phase type

Single / Simultaneous operation multi type

1-1. COOLING OPERATION

1-1-1 COOLING CAPACITY CONTROL

A sensor (room temperature thermistor) built in the indoor unit will usually perceive
difference or variation between a set temperature and present room temperature, and
controls the operation frequency of the compressor.
The maximum frequency is limited in the range shown in Figure 1 based on the fan speed mode
and the outdoor temperature.
If the room temperature is 2 °C higher than a set temperature,
the compressor operation frequency will attain to maximum frequency.

If the room temperature is 2.5 °C lower than a set temperature, the compressor
will be stopped.

When the room temperature is between +2 °C to -2.5 °C of the setting temperature,
the compressor frequency is controlled within the range shown in Table1.

Minimum
frequency

Maximum
frequency

AO *G36LATT
AO *G45LATT
AO *G54LATT
AOTG60LATT

15rps
15rps
15rps
15rps

55rps
80rps
80rps
80rps

( Table 1 : Compressor Frequency Range )

01-01

AO *G36LATT

A zone
B zone
C zone
D~ F zone

Med Low Quiet

Fan speed mode

High

55
55
47
38
77
77
57
47
80
80
64
55

DC indoor unit
connection

A zone
B zone
C zone
D~ F zone
A zone
B zone
C zone
D~ F zone
A zone
B zone
C zone
D~ F zone
A zone
B zone
C zone
D~ F zone
A zone
B zone
C zone
D~ F zone
A zone
B zone
C zone
D~ F zone

AO *G36LATT

45
45
38
33
53
53
46
41
59
59
52
46

38
38
36
29
46
46
41
37
52
52
46
40

29
29
29
23
35
35
35
28
38
38
38
29

55
55
53

45
64
64

57(56)

46
72

72
64(62)
52(55)

78
78
67
59

53
53
45

40
56
56

46(47)

45

64(62)
64(62)

55
47

67

67

59

55

45
45
38

36
54(47)
54(47)
46(41)
41(39)
61(55)
61(55)
52(46)
46(45)

59

59

52

47

AO *G45LATT

AO *G54LATT

AOTG60LATT

AO *G54LATT
(AOTG54LATT)

AO *G45LATT
(AOTG45LATT)

AC indoor unit
connection
(High static pressure)

[ rps ]

( Fig 1-1 : Limit of Maximum Frequency based on Outdoor Temperature for Single type )

A zone

B zone
C zone
D zone
E zone
F zone

36°C
32°C

21°C
12°C

2°C

When the room
temperature rises

Outdoor air
temperature

34°C
30°C
19°C
10°C

0°C

When the room
temperature drops

.

.

.

1-2. HEATING OPERATION

1-2-1 HEATING CAPACITY CONTROL

A sensor (room temperature thermistor) built in the indoor unit will usually perceive
difference or variation between a set temperature and present room temperature, and
controls the operation frequency of the compressor.
The maximum frequency is limited in the range shown in Figure 2 based on the outdoor temperature.
If the room temperature is lower 3 °C than a set temperature,
the compressor operation frequency will attain to maximum frequency.

If the room temperature is higher 2.5 °C than a set temperature, the compressor
will be stopped.

When the room temperature is between +2.5 °C to -3 °C of the setting temperature,
the compressor frequency is controlled within the range shown in Table 2.

01-02

Minimum
frequency

Maximum
frequency

AO *G36LATT
AO *G45LATT
AO *G54LATT
AOTG60LATT

18rps
18rps
18rps
18rps

80rps
85rps
85rps
85rps

( Table 2 : Compressor Frequency Range )

.

.

.

AO *G36LATT

AO *G36LATT

A zone
B zone
C zone
D~ F zone

Med Low Quiet

Fan speed mode

High

55
55
55
41
55
55
53
41
77
77
59
46
80
80
65
52
80
80
62
52

A zone
B zone
C zone
D~ F zone
A zone
B zone
C zone
D~ F zone

53
53
41
38
53
53
41
38
56
56
46
41
62
62
52
46
62
62
52
46

41
41
38
33
53
53
41
33
46
46
41
37
52
52
46
40
62
62
52
40

31
31
31
27
31
31
31
27
35
35
35
30
38
38
38
33
38
38
38
33

AO *G45LATT

AO *G54LATT

AO *G54LATT

[ rps ]

( Fig 1-2 : Limit of Maximum Frequency based on Outdoor Temperature for Multi type )

A zone

B zone
C zone
D zone
E zone
F zone

36°C
32°C

21°C
12°C

2°C

When the room
temperature rises

Outdoor air
temperature

34°C
30°C
19°C
10°C

0°C

When the room
temperature drops

A zone
B zone
C zone
D~ F zone
A zone
B zone
C zone
D~ F zone

Recital

In the case of the Indoor unit
of Duct or Ceiling type

In the case of the Indoor unit
of Duct or Ceiling type

1-3. DRY OPERATION

1-3-1 INDOOR UNIT CONTROL

The compressor rotation frequency shall change according to set temperature and room
temperature variation which the room temperature sensor of the indoor unit has detected
as shown in the Fig 2.

01-03

Room
temperature

Room

temperature

Compressor ON

Ts+1.5 °C

Ts+0.5 °C

Compressor OFF

( Fig.2 : Compressor Control based on Room Temperature )

Ts : Setting temperature

Compressor

ON

OFF

Indoor fan

DRY air flow

OFF

( Fig 3 : Indoor Fan Control for DC indoor unit )

10 30 60 180 60 180 60 10 30

(sec)

X zone

Y zone

( Table 3 : Compressor Frequency Range )

AO *G36LATT

AO *G36LATT

X zone
Y zone
X zone
Y zone
X zone
Y zone
X zone
Y zone

Frequency

DC indoor unit
connection

AO *G54LATT

AC indoor unit
connection
(High static pressure)

[ rps ]

AO *G45LATT

AO *G36LATT

AO *G45LATT

AO *G54LATT

AOTG60LATT

X zone
Y zone
X zone
Y zone

31

0

29

0

35

0

38

0

31

0

35

0

38

0

41

0

X zone
Y zone
X zone
Y zone

Recital

In the case of the Indoor unit
of Duct type

S-LOW

Compressor

ON

OFF

LOW

OFF

30 180 120 180 30

(sec)

Indoor fan

ON

530 5

( Fig 4 : Indoor Fan Control for AC indoor unit )

*It is different by model

(about *300rpm)

1-4. AUTO CHANGEOVER OPERATION

01-04

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 2 minutes or 3 minutes.
(This time is different for different types of indoor unit.)
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 4 : 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. 5 : 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

Dry

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.6 : Auto changeover : Cooling - Dry )

TR : Room temperature
Ts : Setting temperature

TR : Room temperature
Ts : Setting temperature

( Air flow mode : Auto )

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

01-05

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

YESYES

1-5. INDOOR FAN CONTROL

1. Fan speed

(Table 5 : Indoor Fan Speed)

01-06

Operation mode Air flow mode Speed (rpm)

Cooling
Fan

Heating

Dry

Hi

Me+

Me

Lo

Quiet

Cool air prevention

Hi

Me

Lo

Quiet

*Soft Quiet

Auto
S-Lo

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

AU *G18LVLB

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

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

960
930
880
740
580
400
960
850
650
500
400
500
300

AU *G22/ 24LVLA

Operation mode Air flow mode Speed (rpm)

Cooling
Fan

Heating

Dry

Hi

Me+

Me

Lo

Quiet

Cool air prevention

Hi

Me

Lo

Quiet

*Soft Quiet

Auto

S-Lo

1040
1000

950
800
740
500

1040

950
800
740
500
740
300

AB *G18LVTB

1300
1200
1150
1000

780

500
1330
1150
1000

780

500

780

300

AB *G22/ 24LVTA

Operation mode Air flow mode Speed (rpm)

Cooling
Fan

Heating

Dry

Hi

Me+

Me

Lo

Quiet

Cool air prevention

Hi

Me

Lo

Quiet

*Soft Quiet

Auto

S-Lo

1380
1300

1220
1140

1380
1300
1220
1140

600

1140

600

AR *G18LLLA
(Normal static pressure: 25Pa)

Operation mode Air flow mode Speed (rpm)

Cooling
Fan

Heating

Dry

Hi

Me+

Me

Lo

Quiet

Cool air prevention

Hi

Me

Lo

Quiet

*Soft Quiet

Auto
S-Lo

Operation mode Air flow mode Speed (rpm)

Cooling
Fan

Heating

Dry

Hi

Me+

Me

Lo

Quiet

Cool air prevention

Hi

Me

Lo

Quiet

*Soft Quiet

Auto
S-Lo

Operation mode Air flow mode Speed (rpm)

Cooling
Fan

Heating

Dry

Hi

Me+

Me

Lo

Quiet

Cool air prevention

Hi

Me

Lo

Quiet

*Soft Quiet

Auto
S-Lo

830
700

600
550

830
700
600
550
350
550
350

AR *G22/ 24LMLA
(Normal static pressure: 35Pa)

[Multi type]

[Single type]

Operation mode Air flow mode Speed (rpm)

Cooling
Fan

Heating

Dry

Hi

Me+

Me

Lo

Quiet

Cool air prevention

Hi

Me

Lo

Quiet

*Soft Quiet

Auto
S-Lo

660
600
540
470
430
300
660
540
470
430
300
430
270

AU *G36LRLA

690
650
610
550
470
300
690
610
550
470
300
470
270

AU *G45LRLA
Operation mode Air flow mode Speed (rpm)

Cooling
Fan

Heating

Dry

Hi

Me+

Me

Lo

Quiet

Cool air prevention

Hi

Me

Lo

Quiet

*Soft Quiet

Auto
S-Lo

720
680
630
570
480
300
720
630
570
480
300
480
270

AU *G54LRLA
Operation mode Air flow mode Speed (rpm)

Cooling
Fan

Heating

Dry

Hi

Me+

Me

Lo

Quiet

Cool air prevention

Hi

Me

Lo

Quiet

*Soft Quiet

Auto
S-Lo

01-07

Operation mode Air flow mode Speed (rpm)

Heating
Cooling
Fan

Hi

Me

Lo

1300
1150
1000

AR *G45/ 54LHTA
(Normal static pressure: 100Pa)

Operation mode Air flow mode Speed (rpm)

Cooling
Fan

Heating

Dry

Hi

Me+

Me

Lo

Quiet

Cool air prevention

Hi

Me

Lo

Quiet

*Soft Quiet

Auto
S-Lo

1100
1000

910
750
650
500

1100

910
750
650
500
650
250

AB *G36LRTA

1200
1100
1000

830

680

500
1200
1000

830

680

500

680

250

AB *G45LRTA
Operation mode Air flow mode Speed (rpm)

Cooling
Fan

Heating

Dry

Hi

Me+

Me

Lo

Quiet

Cool air prevention

Hi

Me

Lo

Quiet

*Soft Quiet

Auto
S-Lo

1340
1250
1150

950
790

500
1360
1150

950

790

500

790

250

AB *G54LRTA
Operation mode Air flow mode Speed (rpm)

Cooling
Fan

Heating

Dry

Hi

Me+

Me

Lo

Quiet

Cool air prevention

Hi

Me

Lo

Quiet

*Soft Quiet

Auto
S-Lo

Operation mode Air flow mode Speed (rpm)

Cooling
Fan

Heating

Dry

Hi

Me+

Me

Lo

Quiet

Cool air prevention

Hi

Me

Lo

Quiet

*Soft Quiet

Auto
S-Lo

1220
1020

840
670

1200
1020

840
670
420
670
420

AR *G36LMLA
(Normal static pressure: 47Pa)

1300
1020

840
670

1310
1020

840
670
420
670
420

AR *G45LMLA
(Normal static pressure: 30Pa)

Operation mode Air flow mode Speed (rpm)

Cooling
Fan

Heating

Dry

Hi

Me+

Me

Lo

Quiet

Cool air prevention

Hi

Me

Lo

Quiet

*Soft Quiet

Auto
S-Lo

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

Operation mode Air flow mode Speed (rpm)

Cooling
Fan

Heating

Dry

Hi

Me+

Me

Lo

Quiet

Cool air prevention

Hi

Me

Lo

Quiet

*Soft Quiet

Auto
S-Lo

990
850

700

990
850
700

370
700
370

ARTG36LHTB
(Normal static pressure: 60Pa)

1040/ 1000

880/ 840
740/ 700
740/ 700
420/ 380
420/ 380

ARTG45LHTB
(Normal static pressure: 60Pa)

Operation mode Air flow mode Speed (rpm)

Heating
Cooling
Fan
Dry

Hi

Me

Lo
Lo

Intermittent

S-Lo

1090/ 1050

900/ 860
780/ 740
780/ 740
420/ 380
420/ 380

ARTG54LHTB/ 60LHTA
(Normal static pressure: 60Pa)

Operation mode Air flow mode Speed (rpm)

Heating
Cooling
Fan
Dry

Hi

Me

Lo
Lo

Intermittent

S-Lo

2. FAN OPERATION

The airflow can be switched in 5 steps such as Auto, Quiet, Low, Med, High, while the indoor
fan only runs.
The High Static Pressure Duct type is 4 steps such as Auto, Low, Med, High.

3. COOLING OPERATION (Auto : Cooling)

Switch the airflow [Auto], and the indoor fan motor will run according to a room temperature,
as shown in Figure 7.
On the other hand, if switched in [High] [Quiet], the indoor motor will run at a constant airflow of [Cool]
operation modes Quiet, Low, Med, High, as shown in Table 5.

( Fig 7 : 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

=

High

Med

Low

01-08

4. HEATING OPERATION (Auto : Heating)

Switch the airflow [AUTO], and the indoor fan motor will run according to a room temperature,
as shown in Figure 8.
On the other hand, if switched in [High] [Quiet], the indoor motor will run at a constant airflow
of [Heat] operation modes Quiet, Low, Med, High, as shown in Table 5.

( Fig 8 : 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

Low

Med

High

The High Static Pressure Duct type is 4 steps such as Auto, Low, Med, High.

The High Static Pressure Duct type is 4 steps such as Auto, Low, Med, High.

6. DRY OPERATION

Refer to the Fig 3,4.
During the DRY mode operation, the fan speed setting can not be changed.

01-09

5. COOL AIR PREVENTION CONTROL (Heating mode)

The maximum value of the indoor fan speed is set as shown in Figure 9, based on the detected
temperature by the indoor heat exchanger sensor on heating mode.
When the compressor does not operate, the indoor fan motor operates [S-Lo] or [Stop] mode.

( Fig 9 : Cool Air Prevention Control )

[ Cassette, Ceiling type ]

[ Duct type ]

*Hi
or setting fan mode

*Lo
or setting fan mode

37°C

29°C

32°C

24°C

Indoor heat exchanger
temperature rises

Indoor heat exchanger
temperature drops

Cool air
prevention

S-Lo

S-Lo

42°C

30°C

34°C

Indoor heat exchanger
temperature rises

Indoor heat exchanger
temperature drops

Hi

*Me+
or setting fan mode

*Lo
or setting fan mode

*Lo
or setting fan mode

*Lo
or setting fan mode

39°C

37°C

37°C

32°C

24°C

*Lower speed is selected.

42°C

30°C

34°C

Indoor heat exchanger
temperature rises

Indoor heat exchanger
temperature drops

Hi

*Me+
or setting fan mode

*Lo
or setting fan mode

39°C

37°C

37°C

32°C

24°C

*Lower speed is selected.

*Lower speed is selected.

Hi

*Lo
or setting fan mode

*Lo
or setting fan mode

37°C

29°C

32°C

24°C

Indoor heat exchanger
temperature rises

Indoor heat exchanger
temperature drops

*Lower speed is selected.

13 min. later

13 min. later

[ High Static Duct type ]

Setting fan mode

S-Lo

27°C

24°C

Indoor heat exchanger
temperature

S-Lo or stop

Setting fan mode

Lo

27°C

24°C

Indoor heat exchanger
temperature

Lo

13 min. later

1-6. OUTDOOR FAN CONTROL

1. Outdoor Fan Motor

Following table shows the fan speed of the outdoor unit.

(Table 6 : Fan speed of the outdoor unit)

Upper fan
Lower fan
Upper fan
Lower fan

The outdoor fan speed is decided depending on the compressor and the outdoor temperature.
The compressor and the fan start-up at the same time,

and the fan stops after the compressor stops and 60 seconds has passed.
The fan doesn't operates for 10 seconds after the fan stops.
The upper fan and the lower fan operates at 500 rpm for 20 seconds after the start-up.
However, the fan operates at 200rpm when the initial rotation speed is 300rpm or less.

Cooling

850/ 780/ 520/ 480/ 400/ 350/ 280 rpm
800/ 750/ 520/ 350/ 280/ 0 rpm
900/ 850/ 780/ 520/ 480/ 400/ 350/ 280 rpm
800/ 750/ 520/ 350/ 280/ 0 rpm

AO *G36/ 45LATT

01-10

AO *G54LATT
AOTG60LATT

Upper fan
Lower fan
Upper fan
Lower fan

Heating

870/ 780/ 520/ 350/ 200/ 170/ 150 rpm
840/ 750/ 520/ 350/ 200/ 170/ 150 rpm
900/ 870/ 780/ 520/ 350/ 200/ 170/ 150 rpm
900/ 840/ 750/ 520/ 350/ 200/ 170/ 150 rpm

AO *G36/ 45LATT

AO *G54LATT
AOTG60LATT

.
.

.
.
.

1-7. LOUVER CONTROL

01-11

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)

(Fig 10 : Air Direction 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-Low or Stop mode, the swinging operation is interrupted
and the louver stops at the memorized position.
( Stop mode means Operation stop.)

During Cooling / Heating / Dry / Fan mode :

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

The type of operation

Cooling / Dry

Range of swing

to

Heating

to

Fan( )

to

to

to

Fan( )

to

1. For Floor / Ceiling type < AB *G18LVTB, AB *G22/ 24LVTA >

1

2

3

4

5

6

7

12345

67

1

2345

67

1
7

7

5

41

1 4
3

7

1

4

3 7

1

During Heating start-up and Defrost operation, to prevent the thing that
the cool air blows to the person directly, the louver is set to .

7

5

During Cooling and Dry mode operation, if the Vertical Louvers are left in the to ,

4

4

they will automatically return to position .

<Operation continues for 30 minutes>

<Operation stops within 30 minutes>

they will automatically return to position in next Cooling start-up.

For the dew condensation prevention of the Vertical Louvers.

01-12

1-3. HORIZONTAL LOUVER CONTROL

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

(Function Range)

(Fig 11 : Air Direction Range)

1-4. 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-Low or Stop mode, the swinging operation is interrupted
and the louver stops at the memorized position.
( Stop mode means Operation stop.)

The type of operation

Cooling / Heating / Dry / Fan

Range of swing

RIGHT/LEFT air direction louvers

Use the air direction adjustments within the ranges shown above.
The remote control unit's display does not change.

(All range)

1

2

3

4

5

12345

to

15

01-13

2-1. 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)

(Fig 12 : Air Direction Range)

(Operation Range)

2-2. 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-Low or Stop mode, the swinging operation is interrupted
and the louver stops at the memorized position.
( Stop mode means Operation stop.)

During Cooling / Heating / Dry / Fan mode :

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.

The type of operation

Cooling / Dry

Range of swing

to

Heating

to

2. For Ceiling Type < AB *G36/ 45/ 54LRTA >

12345

12345

5

1

1

1

5

4

3

to

5

5

4

1

During Heating start-up and Defrost operation, to prevent the thing that
the cool air blows to the person directly, the louver is set to .

During Cooling and Dry operation, if the Vertical Louvers are left in the to ,

3

3

they will automatically return to position .

<Operation continues for 30 minutes>

<Operation stops within 30 minutes>

they will automatically return to position in next Cooling start-up.

For the dew condensation prevention of the Vertical Louvers.

Fan

01-14

2-3. HORIZONTAL LOUVER CONTROL

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

(Function Range)

(Fig 13 : Air Direction Range)

2-4. 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-Low or Stop mode, the swinging operation is interrupted
and the louver stops at the memorized position.
( Stop mode means Operation stop.)

The type of operation

Cooling / Heating / Dry / Fan

Range of swing

to

Use the air direction adjustments within the ranges shown above.
The remote control unit's display does not change.

(All range)

12345

15

01-15

3-1. 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 14 : Air Direction Range)

(Operation Range)

During Cooling / Heating / Dry / Fan mode :

Cooling / Dry / Fan mode Horizontal flow
Heating mode Downward flow

3-2. 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-Low or Stop mode, the swinging operation is interrupted
and the louver stops at the memorized position.
( 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.

The type of operation

Cooling / Heating / Dry / Fan

Range of swing

to

3. For Compact Cassette Type < AU *G18LVLB, AU *G22/ 24LVLA >

1234

1234

1

14

4

During Heating operation, to prevent the thing that the cool air blows to the person directly,
the louver is set to .

1

1

2

3

4

01-16

4-1. 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 15 : Air Direction Range)

(Operation Range)

During Cooling / Dry / Fan mode :

Cooling / Dry / Fan mode Horizontal flow
Heating mode

Downward flow

4-2. 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-Low or Stop mode, the swinging operation is interrupted
and the louver stops at the memorized position.
( 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.

The type of operation

Cooling / Heating / Dry / Fan

Range of swing

to

4. For Cassette Type < AU *G36/ 45/ 54LRLA >

1234

1234

During Heating mode :

234

1

14

4

During Heating operation, to prevent the thing that the cool air blows to the person directly,
the louver is set to .

1

1-8. COMPRESSOR CONTROL

1. OPERATION FREQUENCY RANGE

The operation frequency of the compressor is different based on the operation mode as shown in Table 7.

(Table 7 : Compressor Operation Frequency Range)

2. OPERATION FREQUENCY CONTROL AT START UP (Common in all models)

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

(Fig 16 : Compressor Control at Start-up)

28rps

180sec 270sec

40rps

01-17

90sec

AO *G36LATT
AO *G45LATT
AO *G54LATT
AOTG60LATT

15rps
15rps
15rps
15rps

55rps
80rps
80rps
80rps

< Normal start-up >

54rps

70rps

360sec

25rps

480sec270sec

40rps

30sec

54rps

70rps

650sec

16rps

28rps

620sec560sec

< Cold start at Heating mode (Compressor start after long time.)>

Upper Limit
Frequency

Upper Limit
Frequency

25rps

120sec

30sec

54rps

70rps

650sec

16rps

300sec

< Cold start at Heating mode (Compressor start after long time.)>

Upper Limit
Frequency

Min

Max

Cooling

18rps
18rps
18rps
18rps

80rps
85rps
85rps
85rps

Min

Max

Heating

31 (29)rps

35rps
38rps

Dry

DC
indoor unit

AC
indoor unit

31rps
35rps
38rps
41rps

[Outdoor air temp.< 10°C]

[Outdoor air temp.> 10°C]

=

01-18

1-9. TIMER OPERATION CONTROL

AR- RAH1E, RAH2E

1. ON / OFF TIMER

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

2. PROGRAM TIMER

ON / TIMER
OFF / TIMER
PROGRAM TIMER
SLEEP 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.

Stop mode

Stop mode

Stop mode

Operation mode

Operation mode

Set time

Set time Set time Set time

1-9-1 Wireless Remote Controller

01-19

3. SLEEP TIMER

If the sleep timer 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.

Set temperature rises

( Ts : Set temperature )

Stop of operation

Set temperature lowers

( Ts : Set temperature )

Ts

Stop of operation

In the COOLING operation mode

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

Ts

+1degC

+2degC

-2degC

-1degC

-4degC

-3degC

Set

60min

In the HEATING operation mode

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

Set

30min

60min

90min

01-20

AR- WAE1E

1. ON / OFF TIMER

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 weekly timer allows up to two ON and OFF time to set up per day.

Use this timer function to set operating time for each day of the week.

Operation mode

The operating time can be set in 30 min increments only.
The OFF time can be carried over to next day.
The ON timer and the OFF timer functions cannot be set with using the weekly timer.

Both ON and OFF time must be set.

2. WEEKLY TIMER

2-1. WEEKLY TIMER

Stop mode

Stop mode

Stop mode

Operation mode

Operation mode

Set time

Set time Set time Set time

1-9-2 Wired Remote Controller

ON / TIMER
OFF / TIMER

WEEKLY TIMER

TEMPERATURE SET BACK TIMER

01-21

The DAY OFF setting is only available for days for which weekly settings already exist.

The SET BACK timer only changes the set temperature for 7 days, it cannot be used to start or stop
air conditioner operation.

The SET BACK timer can be set to operate up to two times per day but only one temperature setting
can be used.

During COOLING/DRY mode, the air conditioner will operate at a minimum of 18°C even if
the SET BACK temperature is set to 17°C or lower.

The DAY OFF setting can only be set one time. The DAY OFF setting is cancelled automatically
after the set day has passed.

Normal

Next day setting

If the operating time carries over to the next day (during a next day setting), the effective
DAY OFF range will be set as shown below.

2-2. DAY OFF setting

3. TEMPERATURE SET BACK TIMER

Stop mode

Stop mode

Operation mode

Stop mode

Operation mode

Preceding day Next day

DAY OFF

Stop mode

Stop mode

Operation mode

Stop mode

Operation mode

DAY OFF

Setting day

Preceding day Next daySetting day

Case of SET BACK timer on the Cooling operation.
( Setting temperature :22°C, SET BACK temperature :26°C)

SET BACK setting

Operation
temperature

Operation
temperature

26°C

22°C
26°C

22°C

24°C

*1

ON OFF OFFON

*1: During the SET BACK function,
the setting temperature is changed.

Chenge the setting temperature:
22°C 24°C

1-10. ELECTRONIC EXPANSION VALVE CONTROL

1-11. TEST OPERATION CONTROL

Under the condition where the air conditioner stops, press the MASTER CONTROL button and
the FAN CONTROL button simultaneously for 2 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.

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

1-12. PREVENT TO RESTART FOR 3 MINUTES ( 3 MINUTES ST )

01-22

With Wired Remote Controller

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

Pulse range

50 480 pulse

(1) Pulse range of EEV

(2) The EEV is set up at 480 pulses when the compressor is stopped.
(3) Initialization (Input of 528 pulses toward closing direction) is operated under the following condition.

* When the power is turned on.
* 4 hours has passed since the last initialization, and 3 minutes has passed after the compressor stop.

(If 12 hours has passed since the last initialization, the compressor is compulsorily stopped.)

All Models

Cooling / Dry
Heating

Operation

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 LED and Timer LED of the air conditioner body blinks 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

40 480 pulse

With Outdoor Unit

Operate [ENTER](TEST RUN) switch on the display board.

1. Set the operation mode to "COOL" or "HEAT" by DIP-SW before power-on.

2. Press [ENTER](TEST RUN) switch for more than 3 seconds "TEST RUN" LED will light on,
If the compressor is operating at starting the test run, the compressor will stop, and a while ,
the test run will start.

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.

1-13. 4-WAY VALVE EXTENSION SELECT

1-14. AUTO RESTART

01-23

1-15. MANUAL AUTO OPERATION (When using the Wireless RC)

If MANUAL / AUTO Button is pushed for less than 10 seconds,
the operation is controlled as shown in Table 9.
If the remote control is lost or battery power dissipated, this function will work without the remote control.

Operation mode

Auto changeover

Auto

Normal
Normal

Continuous (No timer setting available)

24°C

(Table 9)

Setting temp.

Vertical louver
Horizontal louver

OFF

Economy

OFF

Swing

Fan control mode
Timer mode

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
Set air flow direction
Swing
Economy operation
10°C Heat operation

Thermistor detected position

Timer mode

Wireless remote
controller

Wired remote controller
(Memory Backup : Disable)

Wired remote controller
(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.

SET BACK Timer

01-24

1-16. PUMP DOWN

Operate [PUMP DOWN] switch on the display board.

(1) Confirm that power is off, and open the service panel.
(2) Turn the power on.

LED display lights on as shown in the above figure, and the fans and the compressor start operating.
If the [PUMP DOWN] switch is pressed while the compressor is operating, the compressor will stop then

start again in about 3 minutes.

(4) LED display will change as shown as below about 3 minutes after the compressor starts.
Fully close the 3-way valve on the liquid pipe side at this stage.

(5) When LED display changes as shown in the below figure, close the 3-way valve on the gas pipe side tightly.

(6) LED display changes after 1 minute as shown in the figure below.

Fans and compressor stop automatically.

(7) Turn the power off.

PUMP DOWN is completed.

(3) Press [PUMP DOWN] switch for 3 seconds or more after 3 minutes after power on.

POWER

MODE

ERROR

TEST

RUN

PUMP

DOWN

LOW NOISE PEAK CUT

(L1) (L2) (L3) (L4) (L5) (L6) (L7)

ERROR

TEST

RUN

PUMP
DOWN

LOW NOISE PEAK CUT

POWER

MODE

(L1) (L2) (L3) (L4) (L5) (L6) (L7)

ERROR

TEST

RUN

PUMP
DOWN

LOW NOISE PEAK CUT

POWER

MODE

(L1) (L2) (L3) (L4) (L5) (L6) (L7)

ERROR

TEST

RUN

PUMP
DOWN

LOW NOISE PEAK CUT

POWER

MODE

(L1) (L2) (L3) (L4) (L5) (L6) (L7)

ERROR

TEST

RUN

PUMP
DOWN

LOW NOISE PEAK CUT

POWER

MODE

(L1) (L2) (L3) (L4) (L5) (L6) (L7)

ERROR

TEST

RUN

PUMP
DOWN

LOW NOISE PEAK CUT

POWER

MODE

(L1) (L2) (L3) (L4) (L5) (L6) (L7 )

< PUMP DOWN Procedure >

Step (5)

Closing direction

Step (4)

Hexagon wrench

Liquid pipe

Gas pipe

Closing direction

: Light ON: Light OFF

01-25

1-18. DEFROST OPERATION CONTROL

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 10.

1-17. COMPRESSOR PREHEATING

When the outdoor heat exchanger temperature is lower than 0°C and after 30 minutes has passed
after power-on or operation stop, 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 2°C or greater, preheating is ended.

2. CONDITION OF THE DEFROST OPERATION COMPLETION

Release Condition

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

(Table 10 : Condition of starting Defrost Operation)

1st time defrosting after starting operation

Less than 17 min.

17 to 62 min.

62 min. to 4 hours

More than 4 hours

Does not operate

- 9°C

- 5°C

- 3°C

Compressor integrating
operation time

Compressor contiguous
operation time

Defrost operation is released when the conditions become as shown in Table 11.

(Table 11 : Defrost Release Condition)

Operation
temperature

Below 10 min.

Above 10 min.

Less than 35 min.

35 min. to 215min

215 min. to 4 hours

Does not operate

- 6°C

- 5°C

More than 4 hours

- 3°C

Compressor integrating
operation time

Compressor contiguous
operation time

Operation
temperature

Below 10 min.

Above 10 min.

Defrosting after 2nd time upon starting operation

Compressor integrating
operation time

Operating condition

Integrating defrost for intermittent operation

Less than 10 min.

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.

OFF count of the compressor

40 times

More than 210 min.

Compressor OFF

(at outside air temp.< 2°C)

=

01-26

3. Defrost Flow Chart

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

(Not defrosted for 10 minutes)

Outdoor fan : OFF
Compressor : OFF
EEV : 400pulse
4-way valve : OFF
Compressor: ON
Frequency : 65rps (36 type)
: 70rps (45/54/60 type)
EEV : 350pulse
(Outdoor HEX temp.> 2°C)

Heating operation start : Compressor ON

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

Outdoor heat exchanger temperature: Over 10°C
or
Compressor ON time: Over 15 minutes

Defrost end

Compressor
integrating operation:
Over 17 minutes to
below 62 minutes

Compressor
integrating operation:
Over 240 minutes

Compressor
integrating operation:
Over 62 minutes to
below 240 minutes

Outdoor HEX temp.:
Below - 9°C

Outdoor HEX temp.:
Below - 5°C

Outdoor HEX temp.:
Below - 3°C

In case of 1st defrost

In case of 2nd
and later defrost

Outdoor temp ­Outdoor HEX temp.
: Above 5 degC

Compressor
integrating operation:
Over 35 minutes to
below 215 minutes

Outdoor HEX temp.:
Below - 6°C

Compressor
integrating operation:
Over 215 minutes to
below 240 minutes

Outdoor HEX temp.:
Below - 5°C

Compressor
integrating operation:
Over 240 minutes

Outdoor HEX temp.:
Below - 3°C

Compressor OFF:
Outside air temp.< 2°C
(More than 210 min.)

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

In case of Integrating defrost
for intermittent operation

Defrost start

=

=

01-27

Release Condition

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

1-19. OFF DEFROST OPERATION CONTROL

1. OFF DEFROST OPERATION CONDITION

When operation stops in the HEATING mode, if frost is adhered to the outdoor unit
heat-exchanger, the defrost operation will proceed automatically.
In this time, if indoor unit operation lamp flashes slowly (7 sec ON / 2 sec OFF),
the outdoor unit will allow the heat-exchanger to defrost, and then stop.

In heating operation, the outdoor heat exchanger temperature is less than - 4°C,
and compressor operation integrating time lasts for more than 30 minutes.
and compressor operation contiguous time lasts for more than 10 minutes.

OFF Defrost Flow Chart

HEATING operation stops

2. OFF DEFROST END CONDITION

Outdoor heat exchanger temperature: Over 10°C
or
Compressor ON time: Over 15 minutes

Outdoor heat exchanger temperature:
Below - 4°C
and
Compressor integrating operation:
Over 30 minutes
and
Compressor contiguous operation:
Over 10 minutes

Defrost start

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

Defrost end

01-28

1-20. ECONOMY OPERATION

1 -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 more than 105°C, the compressor frequency -10rps,
and it continues the frequency -10rps every 2 minutes until the temperature becomes less than 105°C.

When the discharge temperature becomes less than 100°C,
the control of the compressor frequency is released.

When the discharge temperature becomes more than 115°C,
the compressor is stopped.

2. COMPRESSOR TEMPERATURE PROTECTION CONTROL

When the compressor temperature thermistor detects more than 110°C, the compressor is stopped at once.

115°C

105°C

100°C

Release of protection

Hold

Compressor stop

-10rps every 2 minutes

Discharge
temperature

(Fig 17 : Discharge temperature control)

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 12 )

Operation mode

Heating

Auto

Operate as normal

Economy

10°C

(Table 13)

Setting temp.

Defrost operation

Fan control mode
LED display

1-21. 10°C HEAT OPERATION

10°C HEAT operation performs as below when pressing 10°C HEAT button.

01-29

5. ANTI FREEZING PROTECTION <Cooling / Dry mode>

The compressor frequency is decrease on Cooling and Dry mode when the indoor heat exchanger
temperature sensor detects the temperature lower than Temperature .
Then, the anti-freezing protection is released when it becomes higher than Temperature .

(Table 12 : Anti-freezing Protection Operation / Release Temperature)

Outdoor temperature

Over than 10°C *1

or 12°C

*2

Less than 10°C *1

or 12°C *2

*1. When the temperature rises.
*2. When the temperature drops.

4°C

7°C

13°C

Temperature Temperature

4. PRESSURE OVER RISE PROTECTION <Cooling mode>

When the outdoor unit heat-exchange temperature rises to temperature or greater,
the compressor is stopped and trouble display is performed.
After 3 minutes ST, release of protection.

3. LOW PRESSURE PROTECTION CONTROL <Cooling mode>

When the pressure sensor detected value is 0.68MPaG or less continues for 1minute,
the compressor frequency -8rps.

<After the compressor start-up and 10 minutes has passed>

<After the frequency of the compressor -8rps and 1 minute has passed>

When the detected value becomes more than 0.78MPaG,
this protection is released.

<After the compressor start-up and 1 minute has passed>
The detected value of pressure sensor is 0.02MPaG or less,
continues for 5 minutes, the compressor is stopped.

When the pressure sensor detected value is 0.68MPaG or less,
continues for 1 minute, the compressor continues frequency

-8rps every 1 minute until the detected value becomes
more than 0.68MPaG.

0.78MPaG

0.68MPaG

0.02MPaG

Release of protection

Hold

Compressor stop

-8rps every 1 minute

Pressure

(When continues for 5 minutes)

(Fig 18 : Low pressure protection control)

7. CURRENT RELEASE CONTROL

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.

(Table 13 : Current Release Operation Value / Release Value)

AO *G36LATT
AO *G45LATT
AO *G54LATT
AOTG60LATT

Cooling

6.0A / 5.5A

7.0A / 6.5A

8.0A / 7.5A

8.5A / 8.0A

Heating

6.0A / 5.5A

7.0A / 6.5A

8.0A / 7.5A

8.5A / 8.0A

01-30

6-1. HIGH TEMPERATURE RELEASE CONTROL <Heating mode>

6. HEATING OVERLOAD PROTECTION

In Heating mode, the compressor frequency is controlled as following based on the
detection value of the indoor heat-exchanger temperature sensor and pressure sensor.

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

(Fig.19 : Heating Overload Protection Control)

Indoor heat exchange
temperature

65°C

Compressor is OFF

The compressor frequency is
decreased 7rps every 60 seconds.

55°C

50°C

48°C

Stable range

Release

The compressor frequency is
decreased 1rps every 60 seconds.

Release

Indoor heat exchange
temperature

65°C

Compressor is OFF

The compressor frequency is
decreased 10rps every 60 seconds.

57°C

55°C

50°C

Stable range

Release

The compressor frequency is
decreased 2rps every 60 seconds.

Release

[ High Static Pressure Duct model ] [ Excluding High Static Pressure Duct model ]

- 20°C

The FORCED COOLING OPERATION starts up when MANUAL / AUTO button is pressed more than 10 seconds.
During the FORCED COOLING OPERATION, it keeps operation regardless of detection
value of room temperature sensor.
Operation LED and Timer LED blinks simultaneously while the unit is on the FORCED COOLING OPERATION.
It is released after 60 minutes from starting time.

Cooling

Heating

1-23. FORCED COOLING OPERATION (When using the Wireless RC)

1-24. COMPRESSOR STOP CONTROL

When the detection value of outdoor temperature sensor is lower than temperature
in the table below, the compressor is stopped.

(Table 14 : Operation temperature of compressor stop control)

Operation
temperature

Temperature

01-31

The fan motor for Fresh Air is operated in synchronization with the indoor fan operation
as shown in Figure 20.

The External Electrical Heater is operated as shown in Figure 21.

1-25. FRESH AIR CONTROL (For AU/ AR type)

1-26. EXTERNAL ELECTRICAL HEATER CONTROL (For AR type)

(Fig 20 : Fresh Air control)

(Fig 21 : External Electrical Heater control)

Operation
Stop

Operation
Stop

Fan motor
(Indoor unit)

Fan motor
(for Fresh Air)

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 the compressor stop,
External Electrical Heater is OFF.

It operates only in Heating mode
and when the indoor fan operates.
(However, S-Low is excluded)

01-32

1-27. 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 22 : Detail of Drain Pump Operation)

1-28. LOW NOISE OPERATION

1-29. PEAK CUT OPERATION

01-33

(Table 16 : Outline of PEAK CUT OPERATION)

Low Noise Mode

MODE1

MODE2

Cooling

Heating

Cooling

Heating

Upper fan
Lower fan
Upper fan
Lower fan
Upper fan
Lower fan
Upper fan
Lower fan

520
520
520
520
520
520
520
520

40

46

29

36

52

52

32

37

57

55

36

38

58

58

37

39

Outdoor Fan Speed
( rpm )

Compressor Frequency ( rps )

AO *G36LATT AO *G45LATT AO *G54LATT AOTG60LATT

MODE1 MODE2 MODE3 MODE4

100%75%50%

0%

Forced thermostat-OFF

*The performance drops when operating in the LOW NOISE OPERATION.

The Current Value is limited to reduce the power consumption by External Input.
During the PEAK CUT OPERATION,
"CURRENT OVERLOAD OPERATION", "ECONOMY OPERATION" and "LOW NOISE OPERATION" are effective,
and the outdoor unit operates by lowest current of them.
However, this function becomes invalid during DEFROST OPERATION.

*Percentage is rated electrical power ratio

The compressor frequency and the outdoor unit fan speed are limited to reduce the operation noise by External Input.
During the LOW NOISE OPERATION,
"CURRENT OVERLOAD OPERATION", "ECONOMY OPERATION" and "PEAK CUT OPERATION" are effective,
and the outdoor unit operates by lowest current of them.
However, during the DEFROST OPERATION, the compressor operates by the frequency for DEFROST OPERATION.

( Table 15 : Detail of LOW NOISE OPERATION)

01-34

1-30. DESCRIPTION OF DISPLAY UNIT

•

Display lamp

Function or operation method

(1) POWER / MODE

Green

Lights on while power on Local setting in outdoor unit
or error code is displayed with blink.

(2) ERROR

Red

Blinks during abnormal air-conditioner operation.
Number of blinks indicates kind of error and error code is displayed.

(3) TEST RUN (L1) Orange Lights on during test operation.

(4) PUMP DOWN (L2)

Orange

Lights on during pump down operation.

(5) LOW NOISE MODE
(L3, L4)

Orange

Lights on during “Low noise” function when local setting is activated.
(Lighting pattern of L3 and L4 indicates low noise level)

(6) PEAK CUT
(L5, L6, L7)

Orange

Lights on during “Peak cut” function when local setting is activated.
(Lighting pattern of L5, L6 and L7 indicates peak cut level)

SW1 (DIP-SW) SW2 SW3 SW4 SW5 SW6

(1) (2) (3) (4) (5) (6)

LED DISPLAY

Various settings can be adjusted by changing Dip switches and Push switches on the board of the outdoor unit.
( Excerpt from the "INSTALATION MANUAL" )

Switch

Function or operation method

SW1DIP-SWITCH

For selecting COOLING or HEATING during test operation.
Positions 2 to 4 of Dip switch are not used.

SW2 To switch between “Local setting” and “Error code display”.

SW3

To switch between the individual “Local settings” and the
“Error code displays”.

SW4

To fix the individual “Local settings ” and the “Error code displays”.

SW5

EXIT

SW6 To start the pump down operation.

Dip switches 1 to 4 at shipment from the factory are set as follows.

•

DIP switch

1 2 3 4

COOL OFF OFF OFF

MODE

SELECT

ENTER / TEST RUN

EXIT / INITIALIZE

PUMP DOWN

PUSH SWITCH

1-30-1 Layout of Display Unit

01-35

•

In this mode, the "Operation Condition" and "Error Code" can be displayed by Push Switch on outdoor unit PCB

LED

NO.

Power / Mode

LED

Display Item

L1

L2 L3 L4

Compressor frequency
Upper fan speed (Outdoor unit)
Lower fan speed (Outdoor unit)
EEV pulse
Pressure sensor value (Low pressure range)
Pressure sensor value (High pressure range)
Outdoor air temperature sensor value
Discharge temperature sensor value
Heat-exchanger temperature sensor value (Middle)
Current value

1

Present Value
Of
Each Item

1

Compressor accumulated time
Newest error code
Error code before 1 time

2

Error Code

2

Error code before 2 times

(Table :18 Procedure for Present Value)

Procedure

Operation

Power
Mode

Error L1 L2 L3 L7L6L5L4

1

2

3

4

During status display, press the MODE SWITCH 1 time.
(Status display : Outdoor unit is stopping and no error)

When the EXIT SWITCH is pressed, this mode ends
and returns to the status display.

Selecting display items can be done by pressing
the SELECT SWITCH. (Return to Procedure 3)

Press the ENTER SWITCH.
(Data is displayed by lighting LED. Refer to Table : 19)

When the POWER / MODE LED blinking 1 time,
press the ENTER SWITCH.

1

1

1

1

DATA

: Light ON: Light OFF : Blinking

: Blinking

1 : 1 Time Blinking

1-30-2 Display mode

(Table :17 Display pattern)

: Light ON: Light OFF n : n Time Blinking

5

1

Press the SELECT SWITCH and adjust to DISPLAY ITEM
(from L1 to L4) that you want to confirm. (Refer to Table 17)

(Table 19 : Detail of LED Display Data)

: Light ON: Light OFF 1 : 1 Time Blinking

Item No,

Display Item

Power
Mode

Error L1 L2 L3 L7L6L5L4

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

Compressor
Frequency
( 0 ~ 95rps )

Outdoor Unit
Upper Fan Speed
( 0 ~ 900rpm )

Outdoor Unit
Lower Fan Speed
( 0 ~ 900rpm )

EEV Pulse
( 0 ~ 480pulse )

Pressure sensor value
<Low pressure range>
( 0 ~ 2.1MPa )

Pressure sensor value
<High pressure range>
( 2.1 ~ 4.2MPa )

Check the Low Pressure
Range if it is displayed
[ ~ 2.1 ]

Check the High Pressure
Range if it is displayed
[ 1.81 ~ 2.1 ]

0
1 ~ 15
16 ~ 30
31 ~ 45
46 ~ 60
61 ~ 75
76 ~ 90
90 ~ 95

0
1 ~ 150
151 ~ 300
301 ~ 450
451 ~ 600
601 ~ 750
751 ~ 900
901 ~
0
1 ~ 150
151 ~ 300
301 ~ 450
451 ~ 600
601 ~ 750
751 ~ 900
901 ~
0
1 ~ 80
81 ~ 160
161 ~ 240
241 ~ 320
321 ~ 400
401 ~ 480
481 ~

~ 0.0

0.01 ~ 0.3

0.31 ~ 0.6

0.61 ~ 0.9

0.91 ~ 1.2

1.21 ~ 1.5

1.51 ~ 1.8

1.81 ~ 2.1
~ 2.1

2.11 ~ 2.4

2.41 ~ 2.7

2.71 ~ 3.0

3.01 ~ 3.3

3.31 ~ 3.6

3.61 ~ 3.9

3.91 ~ 4.2

01-36

1

2

3

4

5

6

: Light ON: Light OFF 1 : 1 Time Blinking

Item No,

Display Item

Power
Mode

Error L1 L2 L3 L7L6L5L4

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

Outdoor Air
Temperature
( -30 ~ 70°C )

Discharge
Temperature
( -30 ~ 120°C )

Heat-exchanger
Temperature
<Middle>
( -30 ~ 80°C )

Current
( 0 ~ 10A )

Compressor
Accumulated Time
( H )

~ -15

-15 ~ -5

-5 ~ 5
5 ~ 15
15 ~ 25
25 ~ 35
35 ~ 45

45 ~
~ 55
55 ~ 65
65 ~ 75
75 ~ 85
85 ~ 95
95 ~ 105
105 ~ 115
115 ~
~ 53
53 ~ 55
55 ~ 57
57 ~ 59
59 ~ 61
61 ~ 63
63 ~ 65
65 ~

~ 0.0

0.0 ~ 1.5

1.5 ~ 3.0

3.0 ~ 4.5

4.5 ~ 6.0

6.0 ~ 7.5

7.5 ~ 9.0

9.0 ~
0
0 ~ 10000
10000 ~ 20000
20000 ~ 30000
30000 ~ 40000
40000 ~ 50000
50000 ~ 60000
60000 ~

7

8

9

01-37

<Round up by 1 hour>

10

11

01-38

•

In this mode, the history of abnormality that occurred in the past can be confirmed.

(Table : 20 Procedure for History Mode )

Procedure Operation

Power
Mode

1

2

3

4

During status display, press the MODE SWITCH 2 times.
(Status display : Outdoor unit is stopping and no error)

Press the ENTER SWITCH, Error code is displayed by
lighting LED. (Refer to Table : 21)

When the POWER / MODE LED blinking 2 times,
press the ENTER SWITCH.

: Light ON: Light OFF

: Light ON

: Blinking 2 : 2 Times Blinking

n : n Times Blinking

1 ~ : 1~ 15 Times Blinking 15

1-30-3 Error history mode

(Table : 21 Error Code)

Error L1 L2 L3 L7L6L5L4

2

2

2

2

n n

2

Press the SELECT SWITCH and adjust to DISPLAY ITEM
(from L1 to L4) that you want to confirm. (Refer to Table : 17)

POWER

ERROR

TEST

RUN

PUMP
DOWN

LOW NOISE PEAK CUT

Description

MODE

(L1) (L2) (L3) (L4) (L5) (L6) (L7)

1 1

Serial forward transmission error immediately after operation
Serial forward transmission error during operation

2 2

Indoor unit capacity error

5 15

Indoor unit error

6 1

Over voltage
Power supply frequency error

2

Outdoor unit PCB model information error
PFC communication error

3

Inverter error

4

PFC AD detection error
PFC hardware error

5

IPM error (Trip terminal L error)

8

Rush current limiting resister temp rise protection

7 1

Discharge temp. sensor error

2

Compressor temp. sensor error

3

Heat Ex. middle temp. sensor error
Outdoor unit Heat Ex. liquid temp. sensor error

4

Outdoor temp. sensor error

7

Heat sink temp. sensor error
PFC heat sink temp. sensor error

8 4

Current sensor 1 error (stoppage permanently)

6

High pressure switch 1 error
Pressure sensor error

9 4

Trip detection (stoppage permanently)

5

Compressor motor control error (stoppage permanently)
Compressor motor loss of synchronization (stoppage permanently)

7

Outdoor unit fan motor 1 error (Duty error)

8

Outdoor unit fan motor 2 error (Duty error)

9

4-way valve error

10 1

Discharge temp. 1 error (stoppage permanently)

3

Compressor 1 temp. error (stoppage permanently)

5

Low pressure error

Note.
Selecting display items can be done by pressing the SELECT SWITCH. (Return to Procedure 3)
When the EXIT SWITCH is pressed, this mode ends and returns to the status display.

01-39

1-30-4 ERROR CHECK MODE

•

In this mode, abnormality that is occurring now can be confirmed.

Confirm Chapter 2 " TROUBLE SHOOTING" in detail.

(Table : 22 Procedure for Error Check Mode )

(Table : 23 Demand Response Mode )

Procedure Operation

Power
Mode

1

2

3

Check that the "ERROR" LED blinking (Hi-speed),
and then short press the ENTER SWITCH 1 time.

When the MODE SWITCH is pressed for more than
3 seconds, the Error history is cleared.

Error code is displayed by lighting LED.
(Refer to Table : 21)

: Light ON: Light OFF 2 : 2 Times Blinking

n : n Times Blinking

Error L1 L2 L3 L7L6L5L4

2

2 2 2 2 2 2 2 2 2

n n

Blinking
Hi-speed

1-31. DEMAND RESPONSE OPERATION (For Aust model)

•

•

•

•

This product is designed to be compatible with Air Conditioning Demand Response program.
To utilize the function, Demand Response (DR) adapter kit that interconnects your air conditioner and
Demand Response Enabling Device (DRED) needs to be installed in your air conditioning system,
and you need a separate arrangement.

When your electricity supplier activates one of the following 3 DR modes, the air conditioner switches over to
the appropriate operation, and the OPERATION indicator (green) on the indoor unit blinks to inform you
it has been entered to the DR mode.

DR mode Description of operation in this mode

DR mode 1

Compressor off.

DR mode 2

The air conditioner continues to cool or heat during the Demand Response event, but the electrical energy consumed
by the air conditioner in a half hour period is not more than 50% of the total electrical energy that would be consumed
if operating at the rated capacity in a half hour period.

DR mode 3

The air conditioner continues to cool or heat during the Demand Response event, but the electrical energy consumed
by the air conditioner in a half hour period is not more than 75% of the total electrical energy that would be consumed
if operating at the rated capacity in a half hour period.

OPERATION indicator
(Indoor unit)

Blinking pattern and the interval are as follows:

The indicator will keep blinking until the unit finishes the function.

Shape, number, and the arrangement of the indicators are unit-dependent.
Some indoor units may not have the indicators unless the optional control panel or
IR receiver kit has been installed.

Notes:

ON (4 seconds) OFF (0.5 seconds)

ON (0.5 seconds)OFF (0.5 seconds)

Note.
When the EXIT SWITCH is pressed, this mode ends and returns to the status display.

2. TROUBLE SHOOTING

AIR CONDITIONER

3 phase type

Single / Simultaneous operation multi type

2. TROUBLE SHOOTING

02-01

2-1 ERROR DISPLAY

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

1. ERROR DISPLAY
Please refer the blinking pattern as follows.
The Operation, Timer, Economy lamps operate as follows according to the error contents.

Manual auto switch error

Room temp. sensor error

Indoor unit PCB model information error

Wired remote controller
communication error

Error Contents

4 times

2 times

3 times

3 times

5 times

2 times1 time

Blinking
Hi-speed

Blinking
Hi-speed

Blinking
Hi-speed

Blinking
Hi-speed

Blinking
Hi-speed

Blinking
Hi-speed

Blinking
Hi-speed

Blinking
Hi-speed

Blinking
Hi-speed

Blinking
Hi-speed

Blinking
Hi-speed

Blinking
Hi-speed

Blinking
Hi-speed

Blinking
Hi-speed

Blinking
Hi-speed

Blinking
Hi-speed

Blinking
Hi-speed

Blinking
Hi-speed

Blinking
Hi-speed

Blinking
Hi-speed

Blinking
Hi-speed

Blinking
Hi-speed

Blinking
Hi-speed

Blinking
Hi-speed

Blinking
Hi-speed

Blinking
Hi-speed

Blinking
Hi-speed

Blinking
Hi-speed

Blinking
Hi-speed

Blinking
Hi-speed

Blinking
Hi-speed

Blinking
Hi-speed

1 time1 time

Trouble
shooting

Economy

(Green)

Timer
(Orange)

Operation

(Green)

1 time

Serial communication error

Indoor unit fan motor error

Indoor unit Heat Ex. middle temp.
sensor error

4 times 2 times

1 time5 times

4 times

7 times

6 times

1 time

7 times 3 times

7 times 4 times

2 times

7 times

PFC circuit error

Discharge temp. sensor error

Outdoor unit Heat Ex. liquid temp.
sensor error

Outdoor temp. sensor error

Compressor temp. sensor error

1,2

3

4

5

6

7

8

9

10

11

12

13

4,5,6,7,9,12,13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

7 times 7 times

Heat sink temp. sensor error

8 times 4 times

Current sensor error

8 times 6 times

Pressure sensor error

10 times 3 times

Compressure temp. error

10 times 5 times

Low pressure error

5 times

9 times

9 times

7 times

Compressor rotor position detection
error (permanent stop)

Outdoor unit fan motor 1 error

9 times 8 times

Outdoor unit fan motor 2 error

4 times9 times

9 times 9 times

4-way valve error

1 time10 times

Discharge temp. error

Trip detection

5 times6 times

Trip terminal L error

Indoor Unit Display

Wired Remote
Controller
Display

11

12

21

22

24

27

32

35

41

42

51

53

5U

62

63

64

65

71

72

73

74

77

84

86

94

95

97

98

99

A1

A3

A5

Indoor unit capacity error

2 times2 times

Primary unit, secondary unit setup error

7 times2 times

Connection unit number error
(indoor secondary unit)

4 times2 times

Unit number or Refrigerant circuit
address setting error

1 time2 times

2 times6 times

Outdoor unit main PCB model
information error or communication error

3 times5 times

Drain pump error

15 times5 times

Indoor unit error

3 times

6 times

Inverter 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

SUMOTUWETHFR 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 WE TH FR SA

Error code

Error history number

01234567

FEdcbA98

ı

ı

Lower

Raise

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

OK

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. 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 AC198(AC220V-10%) - 264V(AC240V+10%) appears
at outdoor unit terminal 1 - 2, L1 - N, L2 - N, L3 - N.

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 2 - 3.
>> If it is abnormal, Check the parts as follows.

- Outdoor unit fan motor (PARTS INFORMATION 5)
>> If Outdoor fan motor is abnormal, replace Outdoor unit fan motor and Main PCB.
>> If the parts are normal, replace Main PCB.

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.

02-03

1
2
3

WHITE

BLACK

+

-

2-2 TROUBLE SHOOTING WITH ERROR CODE

RED

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
Indoor unit Power PCB

1. Connection failure 2. External cause 3. Controller PCB failure 4. Power 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 AC198(AC220V-10%) - 264V(AC240V+10%) appears
at outdoor unit terminal 1 - 2, L1 - N, L2 - N, L3 - 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 and Power PCB.

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

02-04

1
2
3

WHITE

BLACK

+

-

RED

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

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.

Check voltage at connector of Wired remote controller of Controller PCB. (Power supply to Wired remote controller)
>> AR* G45/ 54LHTA : CN6, 1 - 3 pin
>> ARTG45/ 54LHTB, 60LHTA : CN140, 1 - 3 pin
>> Other models : CN14, 1 - 3 pin

If it is DC12V, Wired Remote Controller is failure. (Controller PCB is normal)

>> Replace Wired Remote Controller

If it is DC 0V, Controller PCB is failure.

>> Replace Controller PCB

Upon receiving the signal more than 1 time from Wired remote controller,
but the same signal has not been received more than 1 minute.

02-05

Refer to error code table.

Trouble shooting 4
INDOOR UNIT Error Method:

Detective Actuators: Detective details:

Forecast of Cause :

OK

Indicate or Display:

Unit number or Refrigerant circuit
address setting error

Indoor unit Controller PCB

Check the DIP-SW of controller setting.

>> If there is an abnormal condition, correct it by referring to Installation Manual
or Data & Technical Manual.
>> Upon correcting incorrect setting, reset the power.

1. Dip SW incorrect setting 2. Controller PCB failure

Check Point 1 : Check the DIP-SW of Controller PCB setting

When the addresses set in indoor units are not consecutive
in the same refrigerant circuit.

02-06

Refer to error code table.

Check Point 2 : Replace Controller PCB

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

02-07

Trouble shooting 5
OUTDOOR UNIT Error Method:

Indicate or Display:

Indoor unit capacity error

Refer to error code table.

Detective Actuators: Detective details:

Forecast of Cause :

OKOK

Outdoor Unit Main PCB

When the total capacity of indoor units does not match
outdoor capacity while 3 minutes after power-on.

1. The selection of indoor units is incorrect 2. Main PCB 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 Data & Technical Manual.

Check Point 2 : Replace Main PCB

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

Trouble shooting 6
INDOOR UNIT Error Method:

Detective Actuators: Detective details:

Forecast of Cause :

Indicate or Display:

Connection unit number error
(indoor secondary unit)

Indoor unit

Check the indoor unit number connection.

>> If there is an abnormal condition, correct it by referring to Installation Manual
or Data & Technical Manual.
>> Upon correcting incorrect setting, reset the power.

1. Indoor unit connection failure

Check Point 1 : Check the indoor unit number connection

When there are 4 or more indoor units in the same refrigerant system.

02-08

Refer to error code table.

Trouble shooting 7
INDOOR UNIT Error Method:

Detective Actuators: Detective details:

Forecast of Cause :

OK

Indicate or Display:

Primary unit, secondary unit setup error

Indoor unit Controller PCB

Check wiring connection condition of all slave indoor units.
Check wiring connection condition in same refrigerant system.

>> If there is an abnormal condition, correct it by referring to Installation Manual
or Data & Technical Manual.
>> Upon correcting incorrect setting, reset the power.

1. Mis-wiring 2.Indoor unit address setting incorrect 3. Controller PCB failure

Check Point 1 : Check wiring connection condition

When there is no master unit in the same refrigerant system.
When 2 or more master units are connected in the same
reffigerant system.
When slave indoor unit receives serial reverse transfer signal.
When address [0] indoor unit is set as slave unit.

02-09

Refer to error code table.

Check Point 3 : Replace Controller PCB

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

Check the DIP-SW of controller setting.

>> If there is an abnormal condition, correct it by referring to Installation Manual
or Data & Technical Manual.
>> Upon correcting incorrect setting, reset the power.

Check Point 2 : Check the DIP-SW of Controller PCB setting

OK

Detective Actuators: Detective details:

Forecast of Cause:

Check Point 3 : Replace Controller PCB

Check Point 2 :
Check connections condition in control unit

YESYES

NO

Trouble shooting 8
INDOOR UNIT Error Method:

Indicate or Display:

Indoor unit PCB model information error

Indoor unit Controller PCB

1. External cause 2. Defective for connection in controller unit 3. Controller PCB failure

Check Point 1-1 : Reset power supply and operate

Does error indication show reappear?

Check all connectors.
(loose connector or incorrect wiring)
Check any shortage or corrosion on PCB.

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

When power is on and there is some below case.

1. When model information of EEPROM is incorrect

2. When the access to EEPROM failed

02-10

Refer to error code table.

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).

OK

02-11

Trouble shooting 9
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.

Refer to error code table.

Trouble shooting 10
INDOOR UNIT Error Method:

Indicate or Display:

Detective Actuators: Detective details:

Forecast of Cause :

Check Point 2 : Remove connector and check thermistor resistance value

Check Point 1 : Check connection of connector

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

OK

OK

Room temp. sensor error

Indoor unit Controller PCB
Room temperature thermistor

When Room Temperature Thermistor open or short-circuit is
detected at power ON.

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

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

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

Thermistor characteristics (Approx. value)

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

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

If the voltage does not appear, replace Controller PCB.

02-12

Refer to error code table.

6.5

35

8.0

30

10.012.515.820.225.933.6

Resistance Value ( )

2520151050

58.2

-10

44.0

-5

Temperature (°C)

Resistance Value ( )

4.35.3

4540

Temperature (°C)

H/E (MID) Thermistor

Room Temp. Thermistor

Other model

BLACK
BLACK

121

2

11
22

11
22

CN5

CN8

GRAY
GRAY

1
2

CN7

H/E (MID) Thermistor

Room Temp. Thermistor

AR*G45/ 54LHTA

BLACK
BLACK

121

2

11
22

CN8

GRAY
GRAY

CN7

H/E (MID) Thermistor

Room Temp. Thermistor

ARTG45/ 54LHTB, 60LHTA

BLACK

BLACK
BLACK

BLACK

121

2

11
22

CN114

CN110

H/E (MID) Thermistor

Room Temp. Thermistor

AU*G36/ 45/ 54LRLA

RED
RED

121

2

11
22

CN5

CN8

BLACK
BLACK

1
2

CN7

121

2

121

2

1
2

H/E (MID) Thermistor

Room Temp. Thermistor

BLACK
BLACK

CN5

CN8

GRAY
GRAY

CN7

BLACK
BLACK

AB*G18LVTB, 22/ 24LVTA

Trouble shooting 11
INDOOR UNIT Error Method:

Indicate or Display:

Detective Actuators: Detective details:

Forecast of Cause :

Check Point 2 : Remove connector and check thermistor resistance value

Check Point 1 : Check connection of connector

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

OK

OK

Indoor unit Heat Ex. middle temp.
sensor error

Indoor unit Controller PCB

Heat exchanger temperature thermistor (Middle)

When Heat exchanger temperature thermistor (Middle) open or
short-circuit is detected at power ON.

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

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

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

Thermistor characteristics (Approx. value)

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

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

If the voltage does not appear, replace Controller PCB.

02-13

Refer to error code table.

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

H/E (MID) Thermistor

Room Temp. Thermistor

Other model

BLACK
BLACK

121

2

11
22

11
22

CN5

CN8

GRAY
GRAY

1
2

CN7

H/E (MID) Thermistor

Room Temp. Thermistor

AR*G45/ 54LHTA

BLACK
BLACK

121

2

11
22

CN8

GRAY
GRAY

CN7

H/E (MID) Thermistor

Room Temp. Thermistor

ARTG45/ 54LHTB, 60LHTA

BLACK

BLACK
BLACK

BLACK

121

2

11
22

CN114

CN110

H/E (MID) Thermistor

Room Temp. Thermistor

AU*G36/ 45/ 54LRLA

RED
RED

121

2

11
22

CN5

CN8

BLACK
BLACK

1
2

CN7

121

2

121

2

1
2

H/E (MID) Thermistor

Room Temp. Thermistor

BLACK
BLACK

CN5

CN8

GRAY
GRAY

CN7

BLACK
BLACK

AB*G18LVTB, 22/ 24LVTA

Detective Actuators: Detective details:

Forecast of Cause:

Check Point 1 : Check rotation of Fan

Check Point 2 : Check ambient temp. around motor

OK

OK

Indoor unit Controller PCB
Indoor unit Power PCB
Indoor fan motor

1. Fan motor failure 2. Motor protection by surrounding temperature rise

3. Power PCB failure 4. Controller PCB failure

Check if the Fan motor is lock.
(Can the Fan be rotated by hand when operation is off.)
Check the Fan loosening.
(Lock-nut loosening, defective propeller fan)

>> If Fan motor 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 rev. of Indoor Fan is 1/3 or less.
Or the condition of fan speed is 0rpm is continued more than 56 seconds.

02-14

Trouble shooting 12
INDOOR UNIT Error Method:

Indicate or Display:

Indoor unit fan motor error

Refer to error code table.

OK

Check Point 4 : Replace Power PCB and Controller PCB

If Check Point 1~3 do not improve the symptom,
replace Power PCB and 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.

Check Point 2 : Check connector (CN9) and wire

Check Point 1 : Check Float switch

Check Point 3 : Check Drain hose

ONON OFFOFF

OKOK

OKOK

Trouble shooting 13
INDOOR UNIT Error Method:

Indicate or Display:

Detective Actuators: Detective details:

Forecast of Cause :

Drain pump error

Indoor unit Controller PCB
Float switch

When Float switch is ON for more than 3 minutes.

1. Float switch failure 2. Shorted connector and wire 3. Drain hose clog 4. Controller PCB failure

Check operation of float switch. (Any blocking by dust, etc.)

>> If Float switch does not operate, replace it.

Check loose contact of CN9 and shorted wire (Pinched wire).

>> Replace Float switch if the wire is shorted (Pinched wire)

If clogged, clear the clog.

02-15

Refer to error code table.

Check Point 4 : Replace Controller PCB

OKOK

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

Check clogged Drain hose.

02-16

Trouble shooting 14
INDOOR UNIT Error Method:

Indicate or Display:

Outdoor unit main PCB model
information error or communication 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:

Detective Actuators: Detective details:

Forecast of Cause :

OK

Indicate or Display:

Inverter error

Outdoor unit Main PCB
Outdoor unit Inverter PCB

Check if the terminal connection is loose.
Check if connector is removed.
Check if connector is erroneous connection.
Check if cable is open.

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

1. Connection failure 2. Main PCB failure 3. Inverter PCB failure

Check Point 1 : Check connections in control unit

When there is communication error between Main PCB
and Inverter PCB.
When "Inverter PCB cement resistor difference voltage between
both ends" detects 18 V and above twice continuously.

02-17

Refer to error code table.

Check Point 2 : Replace Main PCB and Inverter PCB

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

Trouble shooting 16
OUTDOOR UNIT Error Method:

Detective Actuators: Detective details:

Forecast of Cause :

OK

Indicate or Display:

PFC circuit Error

Outdoor unit Main PCB
Outdoor unit PFC PCB

Check if the terminal connection is loose.
Check if connector is removed.
Check if connector is erroneous connection.
Check if cable is open.

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

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

Check Point 1 : Check connections of between Main PCB and PFC PCB

When communication error between Main PCB and PFC PCB
continues for 10 seconds.
When PFC PCB circuit error continues for 10 seconds.
When PFC PCB output voltage is more than DC760V for 30 seconds.

02-18

Refer to error code table.

Check Point 2 : Check output voltage of Main PCB

Check voltage of Main PCB.
(Measure at Main PCB side connector)

>>1 pin(Brown) - 2 pin(Red) DC15V 5%

If the voltage is not correct, replace Main PCB.

OK

Check Point 3 : Replace PFC PCB

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

02-19

Trouble shooting 17
OUTDOOR UNIT Error Method:

Trip terminal L error

Indicate or Display:

Refer to error code table.

Detective Actuators:

Detective details:

Forecast of Cause :

Check Point 1 : Replace Inverter PCB

Outdoor unit Inverter PCB

1. Inverter PCB failure

Change Inverter PCB.

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

Trouble shooting 18
OUTDOOR UNIT Error Method:

Indicate or Display:

Detective Actuators: Detective details:

Forecast of Cause :

OKOK

OKOK

Discharge temp. sensor error

Outdoor unit Main PCB
Discharge pipe temperature thermistor

When 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 if connector is 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

Thermistor characteristics (Approx. value)

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

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

Refer to error code table.

CN22

BLACK
BLACK

BLACK
BLACK

BLACK

BLACK

BROWN

BROWN

BROWN

BROWN

BLUE

BLUE

CN23

CN24

CN25

CN26

CN27

123

123

123

12312

1212

12

123 123

123 123

THERMISTOR
( HEAT EXCHANGER MID. )

THERMISTOR
( HEATSINK PFC )

THERMISTOR
( DISCHARGE PIPE )

THERMISTOR
( HEAT EXCHANGER OUT )

THERMISTOR
( OUTDOOR TEMP. )

THERMISTOR
( COMPRESSOR TEMP. )

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 :

OKOK

OKOK

Compressor temp. sensor error

Outdoor unit Main PCB
Compressor temperature thermistor

When 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 if connector is 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

Thermistor characteristics (Approx. value)

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

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

Refer to error code table.

BLACK
BLACK

BLACK

BLACK

BLACK

BLACK

BROWN

BROWN

BROWN

BROWN

BLUE

BLUE

123

123

123

12312

1212

12

123 123

123 123

THERMISTOR
( HEAT EXCHANGER MID. )

THERMISTOR
( HEATSINK PFC )

THERMISTOR
( DISCHARGE PIPE )

THERMISTOR
( HEAT EXCHANGER OUT )

THERMISTOR
( OUTDOOR TEMP. )

THERMISTOR
( COMPRESSOR TEMP. )

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

CN22

CN23

CN24

CN25

CN26

CN27

Trouble shooting 20
OUTDOOR UNIT Error Method:

Indicate or Display:

Detective Actuators: Detective details:

Forecast of Cause :

OKOK

OKOK

Outdoor unit Heat Ex. liquid temp.
sensor error

Outdoor unit Main PCB

Heat exchanger temperature thermistor (MID)
Heat exchanger temperature thermistor (OUT)

When 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 if connector is 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

Thermistor characteristics (Approx. value)

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

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.

BLACK
BLACK

BLACK
BLACK

BLACK

BLACK

BROWN

BROWN

BROWN

BROWN

BLUE

BLUE

123

123

123

12312

1212

12

123 123

123 123

THERMISTOR
( HEAT EXCHANGER MID. )

THERMISTOR
( HEATSINK PFC )

THERMISTOR
( DISCHARGE PIPE )

THERMISTOR
( HEAT EXCHANGER OUT )

THERMISTOR
( OUTDOOR TEMP. )

THERMISTOR
( COMPRESSOR TEMP. )

CN22

CN23

CN24

CN25

CN26

CN27

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

Trouble shooting 21
OUTDOOR UNIT Error Method:

Indicate or Display:

Detective Actuators: Detective details:

Forecast of Cause :

OKOK

OKOK

Outdoor temp. sensor error

Outdoor unit Main PCB
Outdoor temperature thermistor

When 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 if connector is 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

Thermistor characteristics (Approx. value)

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

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

Refer to error code table.

BLACK
BLACK

BLACK
BLACK

BLACK

BLACK

BROWN

BROWN

BROWN

BROWN

BLUE

BLUE

123

123

123

12312

1212

12

123 123

123 123

THERMISTOR
( HEAT EXCHANGER MID. )

THERMISTOR
( HEATSINK PFC )

THERMISTOR
( DISCHARGE PIPE )

THERMISTOR
( HEAT EXCHANGER OUT )

THERMISTOR
( OUTDOOR TEMP. )

THERMISTOR
( COMPRESSOR TEMP. )

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

CN22

CN23

CN24

CN25

CN26

CN27

Trouble shooting 22
OUTDOOR UNIT Error Method:

Indicate or Display:

Detective Actuators: Detective details:

Forecast of Cause :

OKOK

OKOK

Heat sink temp. sensor error

Outdoor unit Inverter PCB
Heat sink temperature thermistor (PFC)
Heat sink temperature thermistor (INV)

When 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. Inverter PCB failure

Check Point 1 : Check connection of connector

Check if connector is removed.
Check if connector is 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

Thermistor characteristics (Approx. value)

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

Check Point 3 : Check voltage of Inverter 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 Inverter PCB.

02-24

Refer to error code table.

BLACK
BLACK

CN803

121

2

THERMISTOR
( HEATSINK INV.)

94.3 49.6 27.4 15.8 9.5 5.9 3.8 2.5

1.7 1.2 0.8 0.6 0.4

50

Resistance Value (k )

403020100-30 -20 -10Temperature(°C)

Resistance Value (k )

70 80 89.560Temperature(°C)

BLACK
BLACK

BLACK
BLACK

BLACK

BLACK

BROWN

BROWN

BROWN

BROWN

BLUE

BLUE

123

123

123

12312

1212

12

123 123

123 123

THERMISTOR
( HEAT EXCHANGER MID. )

THERMISTOR
( HEATSINK PFC )

THERMISTOR
( DISCHARGE PIPE )

THERMISTOR
( HEAT EXCHANGER OUT )

THERMISTOR
( OUTDOOR TEMP. )

THERMISTOR
( COMPRESSOR TEMP. )

CN22

CN23

CN24

CN25

CN26

CN27

Trouble shooting 23
OUTDOOR UNIT Error Method:

Detective Actuators: Detective details:

Forecast of Cause :

Check Point 3 : Check Filter PCB

YES

NO

OK

Indicate or Display:

Current sensor error

Outdoor unit Inverter PCB
Outdoor unit Filter PCB

Check Point 2 :
Check connections condition in control unit

Check if the terminal connection is loose.
Check if connector is removed.
Check if connector is erroneous connection.
Check if cable is open.

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

1. Connection failure 2. External cause 3. Filter PCB failure 4. Inverter PCB failure

Check Point 1-1 : Reset power supply and operate

Does error indication reappear?

After compressor runs for 1 minute or more, and while it runs
in 50Hz or more.
When outdoor current value (A/D data) of Input Current Sensor
has detected [00H].

02-25

Refer to error code table.

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 Filter PCB : CN200, 1 - 3 pin
>> 40 seconds after compressor starts.
If it is higher than 0.2V, Inverter PCB is failure.

>> Replace Inverter PCB

If it is lower than 0.2V, Filter PCB is failure.

>> Replace Filter PCB

Trouble shooting 24
OUTDOOR UNIT Error Method:

Detective Actuators: Detective details:

Forecast of Cause :

OK

Indicate or Display:

Pressure sensor error

Outdoor unit Main PCB
Pressure sensor

Check if the terminal connection is loose.
Check if connector is removed.
Check if connector is erroneous connection.
Check if cable is open.

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

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

Check Point 1 : Check connection of the Pressure sensor

30 seconds or more after power-on, when pressure sensor detection
value detects the condition below continuously for 30 seconds or more.
Ps -0.26 or Ps 5.63 [MPa]

02-26

Refer to error code table.

Check Point 2 : Check output voltage of Main PCB

Check voltage of Main PCB.
(Measure at Main PCB side connector)

>>1 pin(Red) - 3 pin(Black) DC5V 5%

BLACK

WHITE

RED

CN16

1
2
3

1
2
3

PS

PRESSURE SENSOR

If the voltage is not correct, replace Main PCB.

OK

Check Point 3 : Check output voltage of Pressure Sensor

Check voltage of Main PCB.
(Measure at Main PCB side connector)

>>2 pin(White) - 3 pIn(Black) Voltage is refer to the following graph.

If the voltage is not correct, replace Presure Sensor.

4.5

0.5
05

Pressure [MPa]

Voltage [V]

>

=

>

=

Trouble shooting 25
OUTDOOR UNIT Error Method:

Detective Actuators: Detective details:

Forecast of Cause :

Check Point 4 : Check Compressor

OK

OK

Indicate or Display:

Check Point 5 : Replace Inverter PCB

OKOK

Check Point 1 : Check connections condition in control unit

Trip detection

Outdoor unit Inverter PCB
Compressor

1. Connection failure 2. Outdoor fan operation failure

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

Check if the terminal connection is loose.
Check if connector is removed.
Check if connector is erroneous connection.
Check if cable is open.

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

If Check Point 1 ~ 4 do not improve the symptom, replace Inverter PCB.

When over current flows in Inverter PCB, the compressor stops.
After the compressor restarts, if the same error is repeated within
40sec, the compressor stops reappear.
If and repeats 5 times, the compressor stops permanently.

02-27

Refer to error code table.

Compressor check is refer to SERVICE PARTS INFORMATION 2.

>> If it is abnormal, replace compressor.

Check Point 2 : Check Outdoor heat exchanger

Is there any obstructing the air flow route?
Is there any clogging of outdoor unit Heat exchanger?

>> If clogged, clear the clog.

Check Point 3 : Check Outdoor fan

OK

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

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

Trouble shooting 26
OUTDOOR UNIT Error Method:

Detective Actuators: Detective details:

Forecast of Cause :

Indicate or Display:

Compressor rotor position detection
error (permanent stop)

Outdoor unit Inverter PCB
Compressor

Check if the terminal connection is loose.
Check if connector is removed.
Check if connector is erroneous connection.
Check if cable is open.

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

1. Connector connection failure 2. Inverter PCB failure 3. Compressor failure

Check Point 1 : Check connections condition in control unit

When "compressor location detection error" is detected consecutively
5 times, within 40 seconds after start-up.

02-28

Refer to error code table.

Check Point 3 : Replace Inverter PCB

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

OKOK

Check Point 2 : Check Compressor

Compressor check is refer to SERVICE PARTS INFORMATION 2.

>> If it is abnormal, replace compressor.

OKOK

Trouble shooting 27
OUTDOOR UNIT Error Method:

Detective Actuators: Detective details:

Forecast of Cause:

Check Point 2 : Check ambient temp. around motor

OK

OK

OK

Indicate or Display:

Outdoor unit fan motor error

Outdoor unit Main PCB
Outdoor fan motor

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

Check Point 1 : Check rotation of Fan

Check if the Fan motor is lock.
(Can the Fan be rotated by hand when operation is off.)
Check the Fan loosening.
(Lock-nut loosening, defective propeller fan)

>> If Fan Motor 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.

Check Point 3 : Check output voltage of Main PCB

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
consecutively 3 times, compressor and fan motor stops.
If repeats 5 times in a row, compressor and fan motor stops
permanently.

02-29

Refer to error code table.

BLACK

BLACK

BROWN

BROWN

RED

WHITE

YELLOW

YELLOW

WHITE

RED

CN81

CN82

12

3456

12

3456

12

3456

12

3456

FM FM

FAN MOTOR 1

( UPPER )

FAN MOTOR 2

( LOWER )

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

Check Point 3 : Check Outdoor unit fan motor

Check Outdoor unit fan motor. (PARTS INFORMATION 5)

>>If Outdoor fan motor is abnormal, replace Outdoor fan motor and Main PCB.

Read wire DC voltage
Red - Black

White - Black

15 1.5V

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

02-30

[ 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 10,11),
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 103 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

Trouble shooting 29
OUTDOOR UNIT Error Method:

Indicate or Display:

Detective Actuators: Detective details:

Forecast of Cause :

Discharge temp. error

Outdoor unit Main PCB
Discharge pipe temperature thermistor

02-31

When the discharge temperature becomes higher than 115°C.
When detecting it 2 times within 24 hours, the compressor stops.

Check Point 1 : Check if gas valve is open

If it is not open, open it and check the operation.

Check Point 3 : Check if gas leak or less gas

Measure gas pressure, if there is a leak, correct it.

>> If recharging refrigerant, make sure to perform
vacuuming and

recharge the specified amount.

Check Point 5 : Check Outdoor heat exchanger

Is there any obstructing the air flow route?
Is there any clogging of outdoor unit Heat exchanger?

>> If clogged, clear the clog.

Check Point 4 : Check Discharge pipe thermistor

Is it on the holder?
Is there a cable pinched?

>> Check characteristics of thermistor (Refer to Trouble shooting 18),
If defective, replace the thermistor

Check Point 2 : Check EEV and Strainer

Are EEV and Strainer open?
(Refer to PARTS INFORMATION 3)

>> If EEV or Strainer is defective, replace it.

OK OK

OK

OK

OK

OK

MPa MPa

1. Valve is close 2. EEV failure 3. Gas leak, less 4. Discharge thermistor failure

5. Outdoor fan operation failure 6. Outdoor heat exchanger clogged

< Cooling mode >

< Heating mode >

Check Point 1 : Check if liquid valve is open

If it is not open, open it and check the operation.

Check Point 2 : Check EEV and Strainer

Are EEV and Strainer open?
(Refer to PARTS INFORMATION 3)

>> If EEV or Strainer is defective, replace it.

Refer to error code table.

Check Point 6 : Check Outdoor fan

OK

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

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

Trouble shooting 30
OUTDOOR UNIT Error Method:

Indicate or Display:

Detective Actuators: Detective details:

Forecast of Cause :

Compressure temp. error

Outdoor unit Main PCB
Compressor temperature thermistor

02-32

When the compressor temperature becomes 110°C or more.
When detecting it 2 times within 24 hours,
the compressor stops permanently.

Check Point 1 : Check if gas valve is open

If it is not open, open it and check the operation.

Check Point 3 : Check if gas leak or less gas

Measure Gas pressure, if there is a leak, correct it.

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

Check Point 4 : Check Compressor temperature thermistor

Is it on the holder?
Is there a cable pinched?

>> Check characteristics of thermistor (Refer to Trouble shooting 19),
If defective, replace the thermistor.

Check Point 2 : Check EEV and Strainer

Are EEV and Strainer open?
(Refer to PARTS INFORMATION 3)

>> If EEV or Strainer is defective, replace it.

OK

OK

OK

OK

OK

OK

1. Valve is close 2. EEV failure 3. Gas leak, less 4. Compressor thermistor failure

5. Outdoor fan failure 6. Outdoor heat exchanger clogged

< Cooling mode >

< Heating mode >

Check Point 1 : Check if liquid valve is open

If it is not open, open it and check the operation.

Check Point 2 : Check EEV and Strainer

Are EEV and Strainer open?
(Refer to PARTS INFORMATION 3)

>> If EEV or Strainer is defective, replace it.

MPa MPa

Refer to error code table.

Check Point 7 : Replace Main PCB

If Check Point 1 ~ 6 do not improve
the symptom, replace Main PCB.

Check Point 5 : Check Outdoor heat exchanger

Is there any obstructing the air flow route?
Is there any clogging of outdoor unit Heat exchanger?

>> If clogged, clear the clog.

Check Point 6 : Check Outdoor fan

OK

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

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

OK

Trouble shooting 31
OUTDOOR UNIT Error Method:

Detective Actuators: Detective details:

Forecast of Cause :

OK

Indicate or Display:

Low pressure error

Outdoor unit Main PCB
Pressure sensor

Check if the terminal connection is loose.
Check if connector is removed.
Check if connector is erroneous connection.
Check if cable is open.

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

1. Connector connection failure 2. Pressure sensor failure 3. Main PCB failure 4. Gas leak, less

Check Point 1 : Check connections of the Pressure sensor

In cooling operation, 1 minute or more after compressor's start-up,
when pressure sensor detects 0.12 MPa or less for consecutive
5 minutes.

02-33

Refer to error code table.

Check Point 2 : Check output voltage of Main PCB

Check voltage of Main PCB.
(Measure at Main PCB side connector)

>>1 pin(Red) - 3 pin(Black) DC5V 5%

If the voltage is not correct, replace Main PCB.

Check Point 3 : Check if gas leak or less gas

Measure Gas pressure, if there is a leak, correct it.

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

MPa MPa

OK

OK

Check Point 4 : Replace Pressure sensor

If Check Point 1 ~ 3 do not improve the symptom, replace Pressure sensor.

BLACK

WHITE

RED

CN16

1
2
3

1
2
3

PS

PRESSURE SENSOR

Trouble shooting 32

Forecast of Cause:

NO

OK

OK

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 manual.

Check Point 2 : Check external cause at indoor unit and outdoor unit(Voltage drop or noise)

Instant voltage drop of ----- Check if there is abnormally large load in the same
power supply power supply system.
Momentary power failure ----- Check if there is a defective contact or leak current in
the power supply system.
Noise ----- Check if there is any equipment causing harmonic wave near electric line.
(Neon bulb or electric equipment that may cause harmonic wave)
Check whether the ground connection is proper.

Check Point 3 : Check electrical components

02-34

2-3 TROUBLE SHOOTING WITH NO ERROR CODE

Check the voltage of power supply.

>> Check if AC198(AC220V-10%) - 264V(AC240V+10%) appears at indoor unit
Terminal 1 - 2(Power supply).

Check Fuse on Power PCB.

>> If Fuse is open, check loose terminal, and replace Fuse.

Check Varistor on Power PCB (VA101, VA102).

>> If Varistor is defective, there is a possibility of an abnormal power supply.
Check the correct power voltage and replace Power PCB.

OK

Trouble shooting 33

Forecast of Cause:

NO

OK

OK

OKOK

Outdoor 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 manual.

Check Point 2 : Check external cause at indoor unit and outdoor unit(Voltage drop or noise)

Instant voltage drop of ----- Check if there is a abnomally large load in the same
power supply power supply system.
Momentary power failure ----- Check if there is a defective contact or leak current in
the power supply system.
Noise ----- Check if there is any equipment causing harmonic wave near electric line.
(Neon bulb or electric equipment that may cause harmonic wave)
Check whether the ground connection is proper.

Check Point 3 : Check electrical components

If Check Point 1 ~ 3 do not improve the symptom, replace Filter PCB, Main PCB, Inverter PCB and PFC PCB.

02-35

Check the voltage of power supply.

>> Check if AC198(AC220V-10%) - 264V(AC240V+10%) appears
at outdoor unit terminal , L1 - N, L2 - N, L3 - N.

Check Fuse(F1, F3) on Main PCB.

>> If Fuse is open, check loose terminal, and replace Fuse.

Check Varistor on Main PCB (VA1 - VA5).

>> If Varistor is defective, there is a possibility of an abnormal power supply.
Check the correct power voltage and replace Main PCB.

OK

Trouble shooting 34

Forecast of Cause:

Check Point 2 : Check external cause at indoor unit and outdoor unit(Voltage drop or noise)

Check Point 1 : Check indoor and outdoor installation condition

Check Point 3 : Check electrical components at indoor unit and outdoor unit

OK

OK

OK

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 controller, or terminals between indoor units.
Or, check if there is an open cable connection.
Are these indoor unit, outdoor unit, and remote controller suitable model to connect?

>> If there is some abnormal condition, correct it by referring to manual.

Is there loose or removed serial communication line of between indoor unit and outdoor unit?

Instant voltage drop of power supply ----- Check if there is abnormally large load in the same power supply system.
Momentary power failure ----- Check if there is a defective contact or leak current in the power supply system.
Noise ----- Check if there is any equipment causing harmonic wave near electric line.
(Neon bulb or electric equipment that may cause harmonic wave)
Check whether the ground connection is proper.

Check voltage at CN6 (AR*G45/ 54LHTA), CN140 (ARTG45/ 54LHTB,60LHTA), and CN14 (Other indoor unit).

>> If it is DC12V, Wired Remote Controller is failure. >> Replace Wired Remote Controller
>> If it is DC 0V, Controller PCB is fallure. >> Replace Controller PCB

>> If Check Point 1, 2 do not improve the symptom, replace control parts of outdoor unit.

02-36

Attention

Trouble shooting 35

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 unit / outdoor unit installation condition

Pipe (In) Pipe (Out)

Pipe (In) Pipe (Out)

OKOK

OKOK

OKOK

OKOK

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.

Is outdoor unit is operating?
(If not, refer to Trouble shooting 33)
Is there any obstructing the air flow route?
Is there any clogging on outdoor unit Hert 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 and 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
Check Compressor

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

MPa MPa

Trouble shooting 36

Forecast of Cause :

Trouble shooting 37

Forecast of Cause:

OK

OK

OK

OK

OK

OK

OK

Abnormal Noise

1. Abnormal installation(Indoor unit / outdoor unit)

2. Fan failure(Indoor unit / outdoor unit)

3. Compressor failure (Outdoor unit)

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

Water Leaking

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?
>> Check Fan motor

02-38

1. Erroneous installation 2. Drain hose failure

MPa MPa

SERVICE PARTS INFORMATION 1

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 connection of Compressor,
and winding resistance.
(Refer to the next page).

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

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

>> 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)

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

MPa

SERVICE PARTS INFORMATION 2

Inverter Compressor

02-40

Check Point 1 : Check connection

Check Point 2 : Check winding resistance

Check Point 3 : Replace Inverter PCB

U(R)

V(S)

W(C)

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

Resistance value : 0.79
(at 20°C)

U(R)

(RED)

V(S)

(WHITE)

W(C)

(BLACK)

Inverter PCB

Check connection of Inverter PCB
(Loose or incorrect wiring)

TM806
(W)

TM805
(V)

TM804
(U)

RED

WHITE

BLACK

Compressor

Inverter PCB

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

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.

Check Point 2 : Check Coil of EEV

Yellow - Brown
Orange - Red
Blue - Brown

White - Red

Read wire

46 4

Resistance value

Check Point 4 : Check voltage from Main PCB.

Check Point 3 : 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.

12V

RED
BROWN
BLUE
ORANGE
YELLOW
WHITE

1
2
3
4
5
6

1
2
3
4
5
6

EV

CN17

CN17

BROWN
BLUE

RED

ORANGE
YELLOW
WHITE

12
3456123

45
6

EV

EXPANSION
VALVE COIL

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.

02-42

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)

Check Point 1 : Check resistance of indoor fan motor

Check each winding resistance of the motor

>>If Resistance value is abnormal, replace motor.

Lead wire color

Resistance value
(20°C)

White - Red
Red - Black
Red - Violet
Violet - Blue

7.73 + 7%

7.08 + 7%

3.80 + 7%

3.80 + 7%

-

-

-

-

For AR *G45/ 54LHTA

For other indoor unit

(AC)

Thermal protector

Pr

Violet (Int.1)

Blue (Low)

Red (Hi)
Black
White

°C

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 (Black)
4 (White)
5 (Yellow)
6 (Brown)

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

02-43

3. DISASSEMBLY PROCESS

AIR CONDITIONER

3 phase type

Single / Simultaneous operation multi type

03-01

3. DISASSEMBLY PROCESS

WARNING

Before servicing the unit, turn the power supply switch OFF,
Then, do not touch electric parts for 10 minutes due to the risk of electric shock.

1. Appearance

2. SERVICE PANEL removal

3. INSULATION SHEET removal

screw
(serrated)

Hook (3 places)

Remove the mounting screws.

Remove the Hook. (6 places)
Remove the INSULATION SHEET
by sliding upward.

Remove the SERVICE PANEL
by sliding downward.

INSULATION SHEET

Hook (6 places)

Remove the connectors, codes
and screw.

Remove the mounting screws.

Remove the locking spacers.

03-04

screw

screw

Locking spacers

CAPACITOR PCB

Hook

5-4. CAPACITOR PCB removal

Remove the CONDENSER CASE
by sliding rightward.

Remove the CONDENSER COVER
by sliding toward.

03-11

16. Precautions for exchange of refrigerant-cycle-parts

EXPANSION VALVE

4WAY VALVE

3WAY VALVE (GAS)

PRESSURE SENSOR

3WAY VALVE (LIQUID)

(1) During exchange the following parts shall be protected by wet rag and not make the allowable temperature or more.
(2) Remove the heat insulation when there is the heat insulation near the welding place.
Move and cool it when its detaching is difficult.
(3) Cool the parts when there are parts where heat might be transmitted besides the replacement part.
(4) Interrupt the flame with the fire-retardant board when the flame seems to hit the following parts directly.
(5) Do not allow moisture or debris to get inside refrigerant pipes during work.
(6) When brazing, be sure to replace the air in the pipe with nitrogen gas to prevent forming oxidization scale.

Part name

Allowable
temperature

Precautions in work

Remove the coil before brazing.
And install the coil after brazing.

Tighten the flare part gripping it. (Tightening torque :12 1.5N m)
Do the static electricity measures.

Remove the suction temp. sensor before brazing.
And install the suction temp. sensor after brazing.

120°C

120°C

100°C

UNION JOINT

Remove the pressure sensor before brazing.
And install the pressure sensor after brazing.

100°C

100°C

+

-

.