Fujitsu AS*G09LTCB, AS*G14LTCB, AO*G09LTCN, AO*G12LTCN, AS*G12LTCB Service Instructions Manual

SPLIT TYPE
ROOM AIR CONDITIONER

WALL MOUNTED

type

Models Indoor unit Outdoor unit

INVERTER

SERVICE

INSTRUCTION

R410A

AS*G09LTCB
AS*G12LTCB
AS*G14LTCB

AO*G09LTCN
AO*G12LTCN
AO*G14LTCN

CONTENTS

1. DESCRIPTION OF EACH CONTROL OPERATION

1. COOLING OPERATION................................................................................................

3. DRY OPERATION.........................................................................................................

2. HEATING OPERATION.................................................................................................

5. INDOOR FAN CONTROL..............................................................................................

4. AUTO CHANGEOVER OPERATION............................................................................

7. LOUVER CONTROL.....................................................................................................

6. OUTDOOR FAN CONTROL..........................................................................................

9. TIMER OPERATION CONTROL...................................................................................

8. COMPRESSOR CONTROL..........................................................................................

11. TEST OPERATION CONTROL...................................................................................

10. ELECTRONIC EXPANSION VALVE CONTROL........................................................

13. FOUR-WAY VALVE EXTENSION SELECT................................................................

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

15. MANUAL AUTO OPERATION ( Indoor unit body operation ).....................................

14. AUTO RESTART.........................................................................................................

16. FORCED COOLING OPERATION..............................................................................

17. COMPRESSOR PREHEATING..................................................................................

19. ECONOMY OPERATION............................................................................................

21. OUTDOOR UNIT LOW NOISE OPERATION..............................................................

20.

HUMAN SENSOR CONTROL.....................................................................................

01-01

01-02

01-02

01-03

01-04

01-06

01-07

01-08

01-09

01-12

01-12

01-12

01-13

01-13

01-13

01-14

01-14

18. 10°C HEAT OPERATION............................................................................................ 01-14

01-14

01-15

22. POWERFUL OPERATION.......................................................................................... 01-15

23. BASE HEATER OPERATION..................................................................................... 01-15

25. OFF DEFROST OPERATION CONTROL...................................................................

24.

DEFROST OPERATION CONTROL........................................................................... 01-16

01-18

26. VARIOUS PROTECTIONS.......................................................................................... 01-19

01-12

3. APPENDING DATA

3-1 FUNCTION SETTING.................................................................................................

3-1-1 INDOOR UNIT....................................................................................................

3-1-2 Procedures to change the Function Setting for wireless RC..............................

03-01

03-01

03-03

3-2 Thermistor Resistance Values.....................................................................................

3-2-1 INDOOR UNIT....................................................................................................

3-2-2 OUTDOOR UNIT................................................................................................

03-05

03-05

03-05

2. TROUBLE SHOOTING

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

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

2-1-2 WIRED REMOTE CONTROLLER DISPLAY (OPTION).....................................

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

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

02-01

02-01

02-02

02-03

02-25

2-4 SERVICE PARTS INFORMATION.............................................................................. 02-30

1 . DESCRIPTION OF EACH
CONTROL OPERATION

R410A

WALL MOUNTED type

INVERTER

( Fig.1 : Outdoor temperature zone )

1. COOLING OPERATION

A sensor (room temperature thermistor) built in the indoor unit body will usually perceive
difference or variation between a set temperature and present room temperature, and
controls the operation frequency of the compressor.

Minimum
frequency

Maximum
frequency

Maximum
frequency

AS*G09LTCB
AS*G12LTCB
AS*G14LTCB

18rps
15rps

76rps

12rps 63rps

57rps

36°C

A zone

34°C

32°C

B zone

30°C

21°C

C zone

19°C

D zone

Indoor fan mode

Me Lo Quiet

A zone 96rps 61rps 51rps 33rps

B zone 96rps 61rps 51rps 33rps

C zone 96rps 61rps 51rps 33rps

AS*G09LTCB

D zone 57rps 42rps 36rps 27rps

E zone 57rps 42rps 36rps 27rps

F zone 57rps 42rps 36rps 27rps

( Table 1 : Compressor frequency range )

01-01

E zone

F zone

10°C

0°C

12°C

2°C

* 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.
However, the maximum frequency is limited in the range shown in Fig.1 based on the indoor
fan mode and the outdoor temperature.

* If the room temperature is some degrees lower than a set temperature,
the compressor will be stopped.

AS*G12LTCB

AS*G14LTCB

A zone 76rps 45rps 37rps 29rps

B zone 76rps 45rps 37rps 29rps

C zone 76rps 45rps 37rps 26rps

D zone 43rps 35rps 26rps 20rps

E zone 51rps 37rps 31rps 22rps

F zone 51rps 37rps 31rps 22rps

A zone 91rps 44rps 34rps 24rps

B zone 91rps 44rps 34rps 24rps

C zone 72rps 34rps 24rps

D zone 52rps 30rps 21rps 18rps

E zone 63rps 34rps 27rps 19rps

F zone 63rps 34rps 27rps 19rps

44rps

Outdoor
temperature drops

Outdoor
temperature rises

( Table 2 : Limit of maximum speed based on outdoor temperature )

96rps
76rps
91rps

Outdoor
temp. zone

Hi

* If the room temperature is 2°C higher than a set temperature, the compressor operation
frequency will attain to maximum performance.

When the compressor operates for 30 minutes continuously at over the maximum frequency ,
the maximum frequency is changed from Maximum Frequency to Maximum Frequency .

2. HEATING OPERATION

A sensor (room temperature thermistor) built in the indoor unit body will usually perceive
difference or variation between a set temperature and present room temperature, and
controls the operation frequency of the compressor.

* If the room temperature is lower by 3°C than a set temperature, the compressor operation
frequency will attain to maximum performance.

* If the room temperature is some degrees higher 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 3.
However, the maximum frequency is limited shown in Table 4 based on the fan mode.

( Table 3 : Compressor frequency range )

01-02

Minimum
frequency

Maximum
frequency

AS*G09LTCB 18rps 130rps

AS*G12LTCB

16rps

119rps

AS*G14LTCB

16rps 140rps

3. DRY OPERATION

The compressor frequency shall change according to the temperature, set temperature,
and room temperature variation which the room temperature sensor of the indoor unit body has
detected as shown in the Table 4.
However, after the compressor is driven, the indoor unit shall run at operation frequency of
61rps (09LTCB), 51rps (12LTCB), 52rps (14LTCB) for 60 seconds.

Ts+0.5°C

Ts -1.5°C

Ts -0.5°C

Ts+1.5°C

( Table 4 : Compressor frequency in Dry mode)

( Fig.2 : Compressor control based on room temperature )

Operating
frequency

33rps

25rps

0rps

09LTCB

X zone

J zone

Y zone

Operating
frequency

J zone

Y zone

X zone 26rps

18rps

0rps

12LTCB

Operating
frequency

J zone

Y zone

X zone 24rps

16rps

0rps

14LTCB

X zone

J zone

Y zone

Room
temperature drops

Room
temperature rises

4. AUTO CHANGEOVER OPERATION

01-03

(Fig. 3 : Operation flow chart in Auto changeover)

START

Room temp.

Room temp.

>Ts+2°C ?

COOLING OPERATION

HEATING OPERATION

YES

YES

NO

NO

NO

NO

YES

YES

TS : Setting temperature

<Ts- 2°C ?

Thermostat remains

in OFF state for 6 minutes or

longer?

System stops

or operation command other than

auto changeover operation?

NO

NO

Thermostat remains

in OFF state for 6 minutes or

longer?

System stops

or operation command other than

auto changeover operation?

YES

YES

When the air conditioner is set to the AUTO mode by remote control, operation starts in the optimum
mode from among the Heating, Cooling, Dry and Monitoring modes.
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.

5. INDOOR FAN CONTROL

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

01-04

2. FAN OPERATION

3. COOLING OPERATION

Switch the airflow [Auto], and the indoor fan motor will run according to a room temperature,
as shown in Figure4.
On the other hand, if switched in [Hi] [Quiet], the indoor motor will run at a constant airflow of [Cool]
operation modes Quiet, Lo, Me, Hi, as shown in Table 5.

( Fig.4 : Airflow change - over ( Cooling : Auto ) )

When the room
temperature rises

When the room
temperature drops

TR : Room temperature
Ts : Setting temperature

TR-Ts > 2°C

1°C > TR-Ts

2°C > TR-Ts > 1°C

=

TR-Ts > 2.5°C

=

1.5°C > TR-Ts

2.5°C > TR-Ts > 1.5°C
=

Hi mode

Me mode

Lo mode

1. Fan speed

( Table 5 : Indoor fan speed )

Operation mode Air flow mode

Speed (rpm)

Cooling/ Fan

Heating

Dry

X zone: 650

J zone: 610

X zone: 650

J zone: 610

X zone: 740

J zone: 710

AS*G09LTCB AS*G12LTCB AS*G14LTCB

4. DRY OPERATION

Refer to the Table 5.
During the dry mode operation, the fan speed setting can not be changed.

Hi

Hi

Me+

Me

Me

Lo

Lo

Quiet

Quiet

S-Lo

Cool air prevention

Powerful

Powerful

1410
1300
1220
1120
960
650
610
570

1470
1370
1260
1180
960
650
610
570

1620
1510
1440
1220
1030
790
610

570
1410
1300
1080
960
650

1470
1370
1120
960
650

1550

1440

1220

980

740

The maximum value of the indoor fan speed is set as shown in Fig.6 based on the detected
temperature by the indoor heat-exchanger sensor on heating mode.

( Fig.6 : Cool air prevension control )

01-05

5. HEATING OPERATION

Switch the airflow [Auto], and the indoor fan motor will run according to a room temperature,
as shown in Fig. 5
On the other hand, if switched in [Hi] [Quiet], the indoor motor will run at a constant airflow
of [Heat] operation modes Quiet, Lo, Me, High, as shown in Table 6.

6. COOL AIR PREVENTION CONTROL (Heating mode)

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

TR-Ts > -1.5°C

=

-2.5°C > TR-Ts

-1.5°C > TR-Ts > -2.5°C
=

TR-Ts > -1°C

=

-2°C > TR-Ts

-1°C > TR-Ts > -2°C
=

When the room
temperature rises

When the room
temperature drops

TR : Room temperature
Ts : Setting temperature

Lo mode

Me mode

Me+ mode

42°C

30°C

34°C

Indoor heat exchanger
temperature rises

Indoor heat exchanger
temperature drops

Hi

Me+

Lo

Cool air
prevention

39°C

37°C

37°C

32°C

28°C

S-Lo

Switch the airflow [Auto] at cooling mode, and the indoor fan motor will run as shown in Fig.7.

7. MOISTURE RETURN PREVENTION CONTROL (Cooling mode& Dry mode)

( Fig.7 : Indoor fan control )

Compressor

ON

OFF

Indoor fan
Setting air flow

Indoor fan
(as shown in Table 6)

S-Lo

OFF

10 30 60 180 60 180 60 10 30

(sec)

( Table 6 : Indoor fan speed )

X zone J zone

AS*G09/12LTCB

650rpm 610rpm

Y zone

0 570rpm 650rpm

AS*G14LTCB 740rpm 710rpm 0 570rpm 740rpm

Dry

Cooling

42°C

30°C

34°C

Indoor heat exchanger
temperature rises

Indoor heat exchanger
temperature drops

Powerful

Hi

Lo

Cool air
prevention

39°C

37°C

37°C

32°C

28°C

S-Lo

<Normal operation>

<Powerful operation>

6. OUTDOOR FAN CONTROL

( Table 8 : Outdoor fan speed )

*

The outdoor fan speed mentioned above depends on the compressor frequency.
(When the compressor frequency increases, the outdoor fan speed also changes to the higher
speed. When the compressor frequency decreases, the outdoor fan speed also changes to the
lower speed.)

*

After the defrost control is operated on the heating mode, the fan speed keeps at the higher speed
as table 9 without relating to the compressor frequency.

01-06

( Table 9 : Outdoor fan speed after the defrost )

1. Outdoor Fan Motor

2. Fan Speed

AC Motor DC Motor

AO*G09/ 12/ 14LTCN

Following table shows the type of the outdoor fan motor. The control method is different
between AC motor and DC motor.

( Table 7 : Type of Motor )

AO*G09LTCN 950rpm

Cooling Heating

AO*G09LTCN

AO*G12LTCN

AO*G14LTCN

Y
Z

Zone

Refer to Fig.8

(rpm)

F
G
Y
Z
F
G
Y
Z
F
G

Dry

250/ 200

330/ 300

300/ 250

850/ 750/ 670/ 500

1050/ 870/ 720/ 530

870/ 530/ 300

1050/ 870/ 720/ 590/ 530

870/530/300

950/ 850/ 750/ 670/ 550/ 450 760/ 470

1100/ 870/ 780/ 720/ 590/ 480 530

1100/ 1000/ 780/ 720/ 590/ 480 530

850/ 500/ 350

250/ 200

300

280/ 230

AO*G14LTCN

AO*G12LTCN

1100rpm
1100rpm

( Fig.8 : Outside air temperature zone selection )

21°C

10°C

Outside air
temperature rises

Outside air
temperature drops

Z zone

Y zone

F zone

G zone

12°C

2°C

19°C

0°C

7. LOUVER CONTROL

1. VERTICAL LOUVER CONTROL

2. SWING OPERATION

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

(Function Range)

01-07

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

Cooling / Dry mode

Horizontal flow

Heating mode Downward flow

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

(Table10 : Swinging Range)

Air Direction RangeFig.9 :

Cooling / Dry mode
Fan mode ( )

Types of Air flow Direction Setting:

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

The Remote Controller's display does not change.

Use the air direction adjustments within the ranges shown above.

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

Range

Heating mode
Fan mode ( )

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

1

2

3

4

5

6

7

2. ADJUST THE RIGHT-LEFT LOUVERS

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

Knob (2 places)

Right-Left Louvers

Knob

To select Vertical Airflow Swing Operation

To select Horizontal Airflow Swing Operation

(No function)

8. COMPRESSOR CONTROL

01-08

1. OPEARTION FREQUENCY RANGE

The operation frequency of the compressor is different based on the operation mode as
shown in the Table 11.

Cooling / Dry Heating

Minimum Maximum Minimum Maximum

AS*G09LTCB

AS*G12LTCB

18rps

15rps

96rps 18rps 130rps

16rps

119rps

76rps

AS*G14LTCB

91rps

16rps

12rps

140rps

AS*G09LTCB
AS*G12LTCB
AS*G14LTCB

AS*G09LTCB
AS*G12LTCB
AS*G14LTCB

AS*G09LTCB
AS*G12LTCB
AS*G14LTCB

AS*G09LTCB
AS*G12LTCB

AS*G14LTCB

56rps 74rps 87rps 97rps

(Table 11 : Compressor frequency range)

2. OPEARTION FREQUENCY CONTROL AT NORMAL START UP

The compressor frequency soon after the start-up is controlled as shown in the Fig.10

(Fig.10 : Compressor control at start-up)

Time

Time Time Time

Time

(Frequency)

Frequency

Frequency

Frequency Frequency

Frequency

Frequency

Frequency

Frequency

Frequency

Frequency

Time

Time Time Time

Time

80sec 140sec 200sec

(Time)

Frequency

Time

6

Frequency

Time

6

108rps

119rps

40rps 57rps 72rps 80rps

101rps

110rps

40rps 59rps 72rps 80rps

101rps

110rps

380sec

500sec440sec

80sec 110sec 140sec

200sec

410sec350sec

3. LIMITATION OF COMPRESSOR FREQUENCY BY OUTDOOR TEMPERATURE

The minimum compressor frequency is limited by outdoor temperature as shown in the Table12.

Under Over Under Over Under Over

39rps 27rps 30rps18rps
35rps 18rps 15rps15rps
24rps 18rps 16rps12rps

(Table12 : Limitation of Compressor Frequency)

10°C 14°C 40°C

Under Over Under Over Under Over Under Over Under Over Under Over

35rps 35rps 35rps 27rps 18rps 30rps27rps
35rps 35rps 35rps 18rps 16rps 16rps29rps
24rps 24rps 24rps 18rps 16rps 16rps24rps

- 3°C

- 20°C - 15°C 7°C 14°C 40°C

[ Cooling/ Dry ]

[ Heating ]

9. TIMER OPEARTION CONTROL

1. OPEARTION FREQUENCY RANGE

The Table 13 shows the available timer setting based on the product model.

ON TIMER / OFF TIMER PROGRAM TIMER SLEEP TIMER

AS*G09/ 12/ 14LTCB

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

Operation mode

Stop mode

Set time of timer

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

Operation mode

Stop mode

Set time of timer

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

Operation mode

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

SLEEP timer operation cannot be combined with ON timer operation.

( Table 13 : Timer Setting )

2. PROGRAM TIMER

Stop mode

Stop mode

Stop mode

Operation mode

Operation mode

Set time Set time Set time Set time

01-09

9-1 WIRELESS REMOTE CONTROLLER

WEEKLY TIMER

3. SLEEP TIMER

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

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

Ts

+1°C

+2°C

Set

60min

In the heating operation mode

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

-4°C

-3°C

-2°C

-1°C

Set

30min

30min

30min

01-10

4. WEEKLY TIMER

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

Setting day Setting day Setting day

ON OFF ON OFF ON OFF

Set time Set time

01-11

9-2 WIRED REMOTE CONTROLLER (OPTION)

The Table14 shows the available timer setting based on the product model.

ON TIMER / OFF TIMER WEEKLY TIMER TEMPERATURE SET BACK TIMER

( Table14 : Timer Setting )

1. ON TIMER / OFF TIMER

Same to 9-1 1.ON TIMER / OFF TIMER and shown in those.

2. WEEKLY TIMER

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

3. TEMPERATURE SET BACK TIMER

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

Normal tmp.

ON

OFF

Setting day Setting day Setting day

ON OFF ON OFF ON OFF

Set time Set time

Set back tmp.

Set time Set time

AS*G09/ 12/ 14LTCB

10. ELECTRONIC EXPANSION VALVE CONTROL

The most proper opening of the electronic expansion valve is calculated and controlled under the present
operating condition based on the Table15.
The compressor frequency, the detected temperature by the discharge temperature sensor,
the indoor heat exchanger sensor, the outdoor heat exchanger sensor, and the outdoor temperature sensor.

The expansion valve is set at 480 pulses 110seconds after the compressor had stopped.

At the time of supplying the power to the outdoor unit, the initialization of the electronic
expansion valve is operated (528 pulses are input to the closing direction).

01-12

( Table15 : The pulse range of the electronic expansion valve control )

AO*G09LTCN

AO*G12LTCN

AO*G14LTCN

Operation mode Pulse range

Between 60 to 480 pulses.

Between 60 to 480 pulses.

Cooling / Dry mode

Heating mode

Cooling / Dry mode

Heating mode

Cooling / Dry mode

Heating mode

between 60 to 480 pulses.

between 45 to 480 pulses.

Initialization will start after 24 hours pass from the last initialization, and the compressor stops

The compressor won't enter operation status for 2 minutes and 20 seconds after the compressor is stopped,
even if any operation is given.

At the time when the air conditioner is switched from the cooling mode to heating mode, the
compressor is stopped, and the four-way valve is switched in 2 minutes and 20 seconds later after
the compressor stopped.

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

13. FOUR-WAY VALVE EXTENSION SELECT

11. TEST OPERATION CONTROL

[ Operation method ]

The outdoor unit, may not operate, depending on the room temperature.
In this case, keep on pressing the MANUAL AUTO button of the indoor unit for more than 10 seconds.
The Operation lamp and Timer lamp will begin to flash simultaneously during cooling test run.
Then, heating test run will begin in about 3 minutes when HEAT is selected by the remote control operation.
(When the air conditioner is running by pressing the test run button, the Operation lamp and Timer lamp
will simultaneously flash slowly.)

[ Release ]

Perform the test operation for 60 minutes.
Pressing the MANUAL AUTO button of the indoor unit for more than 3 seconds.

[ Using the Wired remote control (Option) ]

If the Operation lamp is on, press the START/STOP button to turn it off.
Press the MODE and the FAN buttons at the same time for more than two seconds
to start the test operation.
The operation lamp will light up and "o1" will be displayed on the set temperature display.

[ Release ]

Perform the test operation for 60 minutes.
Pressing the START/STOP button will stop the test operation.

15. MANUAL AUTO OPERATION (Indoor unit body operation)

When the remote control is lost or battery power dissipated, this function will work without the remote control.
When MANUAL AUTO button is set more than 3seconds and less than 10seconds, MANUAL AUTO OPERATION
will be started as shown in Table16.To stop operation, press the MANUAL AUTO button for 3seconds.

(Table16 : MANUAL AUTO OPERATION)

01-13

16. FORCED COOLING OPERATION (TEST OPERATION)

Forced cooling operation is started when press MANUAL AUTO button for 10 seconds or more.
During the forced cooling operation, it operates regardless of room temperature sensor.
Operation LED and timer LED blink at the same time during the forced cooling operation.
They blink for 1 second ON and 1 second OFF on both operation LED and timer LED (same as test operation).
Forced cooling operation is released after 60 minutes of starting operation or pressing MANUAL AUTO button

for 3 seconds.

( Table17 : FORCED COOLING OPERATION )

When FORCED COOLING OPERATION is set, the operation is controlled as shown in Table17.

Press and hold MANUAL AUTO
button for 3 ~ 10seconds

MANUAL AUTO
button

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 started with
the memorized operation contents.
When the power is interrupted and recovered during timer operation, since the timer operation time
is shifted by the time the power was interrupted, an alarm is given by blinking (7 sec ON/2 sec OFF)
the indoor unit body timer lamp.

[ Operation contents memorized when the power is interrupted ]

Operation mode
Set temperature
Set air flow
Timer mode and set time (set by wireless remote controller)
Set air flow Direction
Swing
ECONOMY operation
10°C HEAT operationOutdoor low noise operation

Human sensor

14. AUTO RESTART

OPERATION MODE Auto changeover
FAN CONT. MODE Auto
TIMER MODE Continuous
SETTING TEMP. 24°C
SETTING LOUVER Standard
SWING
ECONOMY

OFF
OFF

(No timer setting available)

Forced cooling operation
Cooling
Hi

Horizontal
(It is changed follow as setting of remote controller)

OFF

Room Temp is not controlled

Manual auto operation

-

-

OPERATION MODE
FAN CONT. MODE
TIMER MODE
SETTING TEMP.
SETTING LOUVER

SWING
ECONOMY

01-14

17. COMPRESSOR PREHEATING

18. 10°C HEAT OPERATION

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

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

( Table 18 : 10°C HEAT operation )

19. ECONOMY OPERATION

20 . HUMAN SENSOR 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 19 )

Mode Cooling/ Dry Heating

Target temperature Setting temp.+2°C Setting temp.-4°C

( Table 20 )

The HUMAN SENSOR functions by pressing SENSOR button on the remote controller.
When the sensor detects that there is no one in the room for 20 minutes or more,
it automatically changes the operation as below settings.

When someone comes back into the room, the human sensor will detect this, and
automatically revert to the original settings.

90°

6 m

6 m

50° 50°

Vertical angle 90°(Side view) Horizontal angle 100°(Top view)

( Application range )

The sensor unit should detect when the human body (estimate: 100cmX30cm) or the object
which has more than 4 degreesC temp, difference from the background and are crossed with

1.0m/s speed in front of the sensor unit.

When the outdoor heat exchanger temperature is lower than 5°C and the all operation has
been stopped for 30 minutes, 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 heat exchanger temperature rises to 7°C or greater,
preheating is ended.

01-15

21. OUTDOOR UNIT LOW NOISE OPERATION

The OUTDOOR UNIT LOW NOISE Operation functions by pressing OUTDOOR UNIT LOW NOISE button
on the remote controller.
This operation stops the PFC control, and changes the Current release operation/release value.
OUTDOOR UNIT LOW NOISE Operation mode can be used during cooling, heating and automatic operation.
It can not be used in Fan and Dry mode

Control / Release

Current release
operation/release value

3.5A / 3.0A

( Table 21 )

22. POWERFUL OPERATION

The POWERFUL OPERATION functions by pressing POWERFUL button on the remote controller.
The indoor unit & outdoor unit will operate at maximum power as shown in Table22.

Release Condition is as follows.
[Cooling / Dry]

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

COMPRESSOR FREQUENCY Maximum

FAN CONT. MODE Powerful

SETTING LOUVER Cooling/ Dry : 3, Heating : 5

(Table22)

Powerful operation

=

=

[Heating]

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

23. BASE HEATER OPERATION

The base heater is operated as shown in Figure 11.

( Fig.11 : Base heater control )

ON

2°C

5°C

OFF

When outdoor
temperature drops

When outdoor
temperature rises

When the compressor stops, Base heater is OFF.
When the outdoor fan motor stops, Base heater is OFF.
In the cooling mode, Base heater is OFF.
In the defrost operation, Base heater maintains the same status as before the compressor stops.

01-16

24. DEFROST OPERATION CONTROL

1. CONDITION OF STARTING THE DEFROST OPERATION

The defrost operation starts as shown in the following Table 23.

2. CONDITION OF THE DEFROST OPERATION COMPLETION

Release Condition

Outdoor heat exchanger temperature sensor value is higher than +16°C or
Compressor operation time has passed 15 minutes.

(Table 23 : Condition of starting Defrost Operation)

Defrost operation is released when the conditions become as shown in Table 24.

(Table 24 : Defrost Release Condition)

Integrating defrost

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

Normal defrost

Compressor integrating operation time

Less than 25 minutes (09/ 12L)
Less than 40 minutes (14L)

More than 25 minutes (09/ 12L)
More than 40 minutes (14L)

Does not operate

Outdoor heat exchanger temp. < -17°C
(at outside air temp. > -10°C)

Outdoor heat exchanger temp. < Outside air temp.- 7°C
or Outdoor heat exchanger temp. < - 25°C
(at outside air temp. < -10°C)

More than 240 minutes
(For continuous operation)

Less than 10 minutes
( For

intermittent operation )

Compressor integrating operation time

Outdoor heat exchanger

temperature below -3°C

More than 213 minutes
(For continuous operation)

Outdoor heat exchanger

temperature below -5°C

OFF count of the compressor

40 times

=

=

=

=

01-17

Outdoor fan : OFF
Compressor speed : 0 rps
EEV : 480pulse
4-way valve : OFF
Compressor speed : 90rps (09L)
70rps (12L)
80rps (14L)

3. Defrost Flow Chart

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

(Not defrosted for 10 minutes)

Heating operation start : Compressor ON

Outdoor HEX temp.: Over 16°C

or

Compressor ON time: Maximum 15 minutes

Defrost end

Outdoor HEX temp.
Below - 17°C

Outdoor HEX temp.

- Outside air temp.
Below - 7°C
or
Outdoor HEX temp.
Below - 25°C

Integrating defrost

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

Defrost start

Normal defrost

Outside air temp. > -10°C Outside air temp. < -10°C

=

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

Compressor
integrating
operation:
Over 240 min.

Outdoor
heat exchanger
temperature:
Below - 3°C

Compressor
integrating
operation:
Over 213 min.

Outdoor
heat exchanger
temperature:
Below - 5°C

Intermittent operation Continuous operation

25. OFF DEFROST OPEARTION CONTROL

01-18

1. OFF DEFROST OPERATION CONDITION

When operation stops in the [Heating operation] 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.

OFF Defrost Flow Chart

Heating operation stop

Defrost start

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

Outdoor heat exchanger temperature:
Over 16°C or
Compressor ON time: Over 15 minutes

Defrost end

2. OFF DEFROST END CONDITION

Release Condition

Outdoor heat exchanger temperature sensor value is higher than 16°C or
Compressor operation time has passed 15 minutes.

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

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

26. VARIOUS PROTECTIONS

1. DISCHARGE GAS TEMPERATURE OVERRISE PREVENSION CONTROL

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

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

When the discharge temperature becomes lower than Temperature , the protection control of the
compressor frequency will be released.
When the discharge temperature becomes higher than Temperature , the compressor is stopped
and the indoor unit LED starts blinking.

104°C 101°C 110°C

( Table 25 : Discharge temperature over rise prevension control / Release temperature )

Temperature

Temperature

Temperature

2. CURRENT RELEASE CONTROL

The compressor frequency is controlled so that the outdoor unit input current does not exceed
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 26 : Current release operation value / Release value )

01-19

[ Heating ]

OT : Outdoor Temperature

[ Cooling ]

OT (Control / Release)

4.0A / 3.5A

5.0A / 4.5A

6.0A / 5.5A

46°C

40°C

OT : Outdoor Temperature

AO*G09LTCN AO*G12LTCN AO*G14LTCN

AO*G09LTCN AO*G12LTCN AO*G14LTCN

OT (Control / Release)

5.5A / 5.0A

7.0A / 6.5A

7.5A / 7.0A

8.5A / 8.0A

17°C

12°C

5°C

[ Heating ]

OT : Outdoor Temperature

[ Cooling ]

OT (Control / Release)

4.5A / 4.0A

6.0A / 5.5A

8.5A / 8.0A

46°C

40°C

OT : Outdoor Temperature

OT (Control / Release)

7.0A / 6.5A

9.0A / 8.5A

10.0A / 9.5A

10.0A / 9.5A

17°C

12°C

5°C

[ Heating ]

OT : Outdoor Temperature

[ Cooling ]

OT (Control / Release)

4.5A / 4.0A

6.0A / 5.5A

9.0A / 8.5A

46°C

40°C

OT : Outdoor Temperature

OT (Control / Release)

7.0A / 6.5A

9.0A / 8.5A

11.0A / 10.5A

13.0A / 12.5A

17°C

12°C

5°C

3. ANTIFREEZING CONTROL (Cooling and Dry mode)

The compressor frequency is decrease on cooling & dry mode when the indoor heat exchanger
temperature sensor detects the temperature lower than Temperature .
Then, the anti-freezing control is released when it becomes higher than Temperature .

(Table 27 : Anti-freezing Protection Operation / Release Temperature)

4. COOLING PRESSURE OVERRISE PROTECTION

When the outdoor unit heat exchange sensor temperature rises to 67°C or greater,
the compressor and the outdoor fan motor are stopped and trouble display is performed.

5. HIGH TEMPERATURE RELEASE CONTROL ( HEATING MODE )

01-20

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

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

[ Control System ]

Indoor heat exchange
temperature rises

Indoor heat exchange
temperature drops

It returns to the normal operation

Compressor is stopped

53°C

55°C

63°C

50°C

The compressor frequency is
decreased 3rps every 60seconds.

The compressor frequency is
decreased 25rps every 120seconds.

Stable zone

2 . TROUBLE SHOOTING

R410A

WALL MOUNTED type

INVERTER

2. TROUBLESHOOTING

02-01

2-1 ERROR DISPLAY

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

Please refer the flashing pattern as follows.
Indoor Unit : AS*G09/ 12/ 14LTCB
The OPERATION, TIMER and ECONOMY lamps operate as follows according to the error contents.

Manual auto switch error

Indoor room thermistor error

Indoor unit model information error
EEPROM access abnormal

Wired remote controller
communication error

Error Contents

Continuous

Continuous

4 times

Continuous2 times

3 times

3 times

5 times

Continuous2 times1 times

Continuous1 times1 times

Trouble
shooting

(Green)

(Orange)

(Green)

1 times

Serial communication error

Indoor unit fan motor error

Indoor heat Ex. thermistor error

Continuous4 times 2 times

Continuous1 times5 times

Intake grille error

Continuous8 times5 times

Outdoor unit main PCB error

2 times6 times

Continuous

Continuous

4 times

7 times

6 times

1 times

Continuous

7 times 3 times

Continuous

7 times 4 times

Continuous

PFC circuit error (09/ 12L)
Active filter error (14L)

Discharge thermistor error

Heat Ex. liquid outlet
thermistor error

Outdoor thermistor error

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

Continuous8 times 4 times

Current sensor error

Continuous

Continuous

Continuous

5 times

9 times

9 times

7 times

Compressor control error

Outdoor unit fan motor error

Continuous

4 times9 times

Continuous

9 times 9 times

4 Way valve error

1 times10 times

Discharge temp. error

Over current error

Continuous

5 times6 times

IPM error

Indoor Unit Display

Wired Remote
Controller
Display

11

12

32

35

41

42

51

58

62

64

65

71

73

74

84

94

95

97

99

A1

[ ]

[ ]

[ ]

OPERATION TIMER

ECONOMY

02-02

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

2-1-2 WIRED REMOTE CONTROLLER DISPLAY (OPTION)

1. SELF - DIAGNOSIS

SU MOTUWETH FR SA

Unit number (usually 0)

Error code

ex. Self-diagnosis check

2. ERROR CODE HISTORY DISPLAY

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

1. Stop the air conditioner operation.

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

4. Press the SET TEMPERATURE buttons , simultaneously for 3 seconds or more
or there is no key input for 60 seconds to stop the display.

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

SU MOTU WETH FR SA

Error code

Error history number

01234 567

FEdcbA98

ı

ı

Lower

Raise

02-03

2-2 TROUBLE SHOOTING WITH ERROR CODE

Trouble shooting 1-1

OUTDOOR UNIT Error Method:

Detective Actuators:

Detective details:

Forecast of Cause:

OK

YESYES

NO

RED

WHITE

BLACK

BLACK

WHITE

GREEN

+

-

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 show again?

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

Check the complete insulation of the grounding.

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
Indoor unit and Outdoor unit.

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

Check Point 3 : Check the voltage of power supply

Check the voltage of power supply

>> Check if AC207V (AC230V -10%) - 253V (AC230V +10%) appears
at Outdoor Unit Terminal L - 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 1 - 3.

>> If it is abnormal, Check Outdoor unit fan motor. (PARTS INFORMATION 5)

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

>> If Outdoor fan motor is 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.

N

L

3

2

1

Indicate or Display:

Refer to error code table.

02-04

Trouble shooting 1-2

INDOOR UNIT Error Method:

Detective Actuators:

Detective details:

Forecast of Cause:

OK

YESYES

NO

+

-

OK

Serial communication error
(Serial Forward Transfer Error)

Indoor unit Controller PCB
Indoor unit Fan motor

1. Connection failure 2. External cause 3. Controller PCB failure 4. Indoor unit fan motor failure

Check Point 1-1 : Reset the power and operate

Does Error indication show again?

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

Check the complete insulation of the grounding.

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
Indoor unit and Outdoor unit.

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

Check Point 3 : Check the voltage of power supply

Check the voltage of power supply

>> Check if AC207V (AC230V -10%) - 253V (AC230V +10%) appears
at Outdoor Unit Terminal L - N.

Check Point 4 : Check Serial Signal (Reverse 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.

>> If it is abnormal, Check Indoor unit fan motor. (PARTS INFORMATION 4)

>> If Indoor unit fan motor is abnormal, replace Indoor unit fan motor and Controller PCB.

When the outdoor unit cannot receive the serial signal from Indoor unit
more than 10seconds.

RED

WHITE

BLACK

BLACK

WHITE

GREEN

N

L

3

2

1

Indicate or Display:

Refer to error code table.

Trouble shooting 2

INDOOR UNIT Error Method:

Detective Actuators:

Detective details:

Forecast of Cause:

Check Point 2 : Check Remote Control and Controller PCB

Check Point 1 : Check the connection of terminal

OKOK

Remote controller communication
error

Indoor unit Controller PCB
Wired remote control

1. Terminal connection abnormal 2. Wired remote control failure 3. Controller PCB failure

After turning off the power, check & correct the followings.

Check the connection of terminal between remote control and Indoor unit,
and check if there is a disconnection of the cable.

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

Check Voltage at CNC01 (terminal 1-3) of UTY-TWBXF(Communication kit).
(Power supply to Remote Control)

>> If it is DC13V, Remote Control is failure. (Controller PCB is normal) >> Replace Remote Control
>> If it is DC 0V, Controller PCB is failure. (Check Remote Control once again) >> Replace Controller PCB

When the indoor unit cannot receive the signal from Wired Remote Control
more than 1minute during normal operation.

02-05

Indicate or Display:

Refer to error code table.

Detective Actuators:

Detective details:

Forecast of Cause:

Check Point 3 : Replace Controller PCB

Check Point 2 :
Check Indoor unit electric components

YESYES

NO

Trouble shooting 3
INDOOR UNIT Error Method:

Indoor unit main PCB error

Indoor unit Controller PCB

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

Check Point 1-1 : Reset Power Supply and operate

Does Error indication show again?

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

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

Note : EEPROM

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

Change Controller PCB.

Check all connectors.
(loose connector or incorrect wiring)

Check any shortage or corrosion on PCB.

When power is on and there is some below case.

1. When model information of EEPROM is incorrect.

2. When the access to EEPROM failed.

02-06

Indicate or Display:

Refer to error code table.

02-07

Trouble shooting 4

INDOOR UNIT

INDOOR UNIT Error Method:

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 Point 2 : Replace Controller PCB

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

Check ON/OFF switching operation by using a meter.

>>If Manual Auto Switch is disabled (on/off switching), replace it.

Indicate or Display:

Refer to error code table.

Trouble shooting 5

INDOOR UNIT

INDOOR UNIT Error Method:

Detective Actuators:

Detective details:

Forecast of Cause :

Check Point 2 : Check Point 2 : Remove connector and check Thermistor resistance value

Check Point 1 : Check connection of Connector

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

10.012.515.820.225.933.644.058.2Resistance Value (k )

Temperature

OK

OK

5.36.58.0Resistance Value (k )

Temperature

Room temperature sensor error

Indoor unit Controller PCB
Room temperature thermistor

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

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

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.

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.

02-08

25°C 20°C15°C10°C5°C0°C-5°C-10°C

40°C

4.4

45°C35°C30°C

THERMISTOR
(ROOM TEMP.)

THERMISTOR
(PIPE)

BLACK

CN4

1
2
3
4

1
2
3
4

BLACK

BLACK

BLACK

Indicate or Display:

Refer to error code table.

Trouble shooting 6

INDOOR UNIT

INDOOR UNIT Error Method:

Detective Actuators:

Detective details:

Forecast of Cause :

Check Point 2 :

62.9103.3134.2176.0233.2312.3579.61131.9Resistance Value (k )

Temperature

OKOK

OK

17.125.639.6Resistance Value (k )

Temperature

Indoor unit Heat Ex. sensor error

Indoor unit Controller PCB
Heat Ex. temperature thermistor

When Heat Ex. Temperature Thermistor open or short-circuit is detected.

1. Connector connection failure 2.Thermistor failure 3. 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 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 Controller PCB (DC5.0V)

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

If the voltage does not appear, replace Controller PCB.

02-09

20°C10°C5°C0°C-5°C-10°C-20°C-30°C

50°C

11.6

60°C

10.4

63°C40°C30°C

Indicate or Display:

Refer to error code table.

THERMISTOR
(ROOM TEMP.)

THERMISTOR
(PIPE)

BLACK

CN4

1
2
3
4

1
2
3
4

BLACK

BLACK

BLACK

Trouble shooting 7
INDOOR UNIT Error Method:

Detective Actuators:

Detective details:

Forecast of Cause:

Check Point 1 : Check rotation of Fan

Check Point 2 : Check ambient temp. around motor

OK

OK

OK

Indoor unit fan motor error

Indoor unit Controller PCB
Indoor unit Fan motor

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

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

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

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

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

>>Upon the temperature coming down, restart operation.

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

02-10

Check Point 4 : Replace Controller PCB

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

Check Point 3 : Check Indoor unit fan motor

Check Indoor unit fan motor. (PARTS INFORMATION 4)

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

Indicate or Display:

Refer to error code table.

02-11

Trouble shooting 8

INDOOR UNIT

INDOOR UNIT Error Method:

Detective Actuators:

Detective details:

Forecast of Cause :

Intake grille error

Indoor unit Controller PCB
Micro switch

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

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

Indicate or Display:

Refer to error code table.

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

Check Point 1 : Check Limit switch

Check Point 3 : Replace Controller PCB

OKOK

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

>>If Micro switch is detective, replace it.

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

>>Replace Micro switch if the wire is abnormal

OKOK

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

Detective Actuators:

Detective details:

Forecast of Cause:

Check Point 2 : Replace Main PCB

YESYES

NO

Trouble shooting 9
OUTDOOR UNIT Error Method:

Outdoor unit main PCB error

Outdoor unit Main PCB

1. External cause (Noise, temporary open, voltage drop) 2. Main PCB failure

Check Point 1-1 : Reset Power Supply and operate

Does Error indication show again?

Check Point 1-2 : Check external cause

Check if temporary voltage drop was not generated.
Check if momentary open was not generated.
Check if ground is connection correctly or there are no related
cables near the power line.

Change Main PCB.

Access to EEPROM failed due to some cause after outdoor unit started.

02-12

Indicate or Display:

Refer to error code table.

Trouble shooting 10-1

INDOOR UNIT

OUTDOOR UNIT Error Method:

Detective Actuators:

Detective details:

Forecast of Cause :

OKOK

OKOK

PFC circuit error

Outdoor unit Main PCB

1. External cause 2. Connector connection failure 3. Main PCB failure

Check Point 2 : Check connection of Connector

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

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

Check Point 3 : Replace Main PCB

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

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

Instant drop : Check if there is a large load electric apparatus in the same circuit.

Momentary power failure : Check if there is a defective contact or leak current
in the power supply circuit.

Noise : Check if there is any equipment causing harmonic wave near electric line.
(Neon bulb or electric equipment that may cause harmonic wave)
Check the complete insulation of grounding.

02-13

When inverter output DC voltage is higher than 415V for over 3 seconds,
the compressor stops.
If the same operation is repeated 5 times, the compressor stops permanently.

Indicate or Display:

Refer to error code table.

For AO*G09/ 12LTCN

Trouble shooting 10-2

INDOOR UNIT

OUTDOOR UNIT Error Method:

Indicate or Display:

Detective Actuators:

Detective details:

Forecast of Cause :

OKOK

OKOK

Active filter error

Outdoor unit Main PCB
Active filter module

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

Check Point 2 : Check connection of Connector

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

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

Check Point 4 : Replace Main PCB

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

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

Instant drop : Check if there is a large load electric apparatus in the same circuit.

Momentary power failure : Check if there is a defective contact or leak current
in the power supply circuit.

Noise : Check if there is any equipment causing harmonic wave near electric line.
(Neon bulb or electric equipment that may cause harmonic wave)
Check the complete insulation of grounding.

02-14

OKOK

Check Point 3 : Check Active filter module

For AO*G14LTCN

Check Active filter module. (PARTS INFORMATION 6)
>>If Active filter module is abnormal, replace it.

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

Refer to error code table.

Trouble shooting 11
OUTDOOR UNIT Error Method:

Detective Actuators:

Detective details:

Forecast of Cause :

Check Point 3 : Check Outdoor Fan

OK

OK

Check Point 6 : Replace Main PCB

OKOK

OKOK

Check Point 1 : Check connections of Outdoor Unit Electrical Components

IPM error

Outdoor unit Main PCB
Outdoor unit Transistor PCB (14L)
Compressor

1. Defective connection of electric components 2. Outdoor Fan Operation failure

3. Outdoor Heat Exchanger clogged 4. Compressor failure

5. Main PCB failure 6. Transistor PCB failure (For 14L)

Check if connector is removed.

Check if the terminal connection is loose.

Check erroneous connection.
Check if cable is open.

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

Check Point 2 : Check Outdoor Fan, Heat Exchanger

Is there anything obstructing the air distribution circuit?
Is there any clogging of Outdoor Heat Exchanger?
Is the Fan rotating by hand when operation is off ?

>> If the Fan Motor is locked, replace it.

Check Outdoor Fan Motor. (Refer to Trouble shooting 17)

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

Check Point 4 : Check Compressor

(PARTS INFORMATION 2)

Check Compressor.

If Check Point 1 5 do not improve the symptom, change Main PCB.

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

02-15

OKOK

Check Point 5 : Check Transistor PCB (For 14L)

(PARTS INFORMATION 7)

Check Transistor PCB.

Indicate or Display:

Refer to error code table.

Trouble shooting 12

INDOOR UNIT

OUTDOOR UNIT Error Method:

Detective Actuators:

Detective details:

Forecast of Cause :

Check Point 2 :

Check Point 3 :

62.5100.9129.8168.6221.1292.9531.61013.1Resistance Value (k )

Temperature

OKOK

OKOK

40.0

2.03.44.66.38.7Resistance Value (k )

Temperature

Discharge thermistor 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 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.

02-16

90°C80°C70°C

26.3

40°C

17.8

50°C

12.3

60°C

30°C

100°C

2.6

110°C

5°C0°C-5°C-10°C-20°C-30°C

20°C10°C

120°C

Indicate or Display:

Refer to error code table.

THERMISTOR
(PIPE)

THERMISTOR
(DISCHARGE)

THERMISTOR
(OUTDOOR)

BLACK
BLACK
BLACK
BLACK

BLACK

BLACK

1
2
3
4

1
2
3
4

1
2
3

1
2
3

CN61

CN62

AO*G14LTCN

THERMISTOR
(PIPE)

THERMISTOR
(DISCHARGE)

THERMISTOR
(OUTDOOR)

BLACK

BLACK
BROWN
BROWN

BLACK

BLACK

1
2
3
4

1
2
3
4

1
2
3

1
2
3

CN71

CN70

AO*G09/ 12LTCN

Trouble shooting 13
OUTDOOR UNIT Error Method:

Detective Actuators:

Detective details:

Forecast of Cause :

Check Point 2 :

6.09.612.416.121.027.8Resistance Value (k )

Temperature

OKOK

OKOK

3.8

0.60.81.21.72.5Resistance Value (k )

Temperature

Outdoor unit Heat Ex. sensor error

Outdoor unit Main PCB
Heat exchanger temperature thermistor

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 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.

02-17

-5°C-10°C

95.6

-30°C

50.3

-20°C

80°C70°C60°C

30°C20°C10°C5°C0°C

50°C40°C

Indicate or Display:

Refer to error code table.

Check Point 3 :

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.

THERMISTOR
(PIPE)

THERMISTOR
(DISCHARGE)

THERMISTOR
(OUTDOOR)

BLACK
BLACK
BLACK
BLACK

BLACK

BLACK

1
2
3
4

1
2
3
4

1
2
3

1
2
3

CN61

CN62

AO*G14LTCN

THERMISTOR
(PIPE)

THERMISTOR
(DISCHARGE)

THERMISTOR
(OUTDOOR)

BLACK

BLACK
BROWN
BROWN

BLACK

BLACK

1
2
3
4

1
2
3
4

1
2
3

1
2
3

CN71

CN70

AO*G09/ 12LTCN

Trouble shooting 14
OUTDOOR UNIT Error Method:

Detective Actuators:

Detective details:

Forecast of Cause :

Check Point 2 :

26.935.246.662.384.2115.2Resistance Value (k )

Temperature

OKOK

OKOK

20.7

6.48.010.012.616.1Resistance Value (k )

Temperature

Outdoor thermistor 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 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.

02-18

-15°C-20°C

224.3

-30°C

159.7

-25°C

35°C

5.2

40°C

4.2

45°C

3.5

50°C

2.8

55°C30°C25°C

10°C5°C0°C-5°C-10°C

20°C15°C

Indicate or Display:

Refer to error code table.

Check Point 3 :

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.

THERMISTOR
(PIPE)

THERMISTOR
(DISCHARGE)

THERMISTOR
(OUTDOOR)

BLACK
BLACK
BLACK
BLACK

BLACK

BLACK

1
2
3
4

1
2
3
4

1
2
3

1
2
3

CN61

CN62

AO*G14LTCN

THERMISTOR
(PIPE)

THERMISTOR
(DISCHARGE)

THERMISTOR
(OUTDOOR)

BLACK

BLACK
BROWN
BROWN

BLACK

BLACK

1
2
3
4

1
2
3
4

1
2
3

1
2
3

CN71

CN70

AO*G09/ 12LTCN

Trouble shooting 15

OUTDOOR UNIT Error Method:

Detective Actuators:

Detective details:

Forecast of Cause :

Check Point 4 : Replace Main PCB

YES

NO

OK

Current sensor error

Outdoor unit Main PCB

Check Point 2 :
Check connections of Outdoor Unit Electrical Components

Check if connector is removed.

Check if the terminal connection is loose.

Check erroneous connection.
Check if cable is open.

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

Check Point 1-2 :
Check external cause at Indoor and Outdoor
(Voltage drop or Noise)

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

Instant drop : Check if there is a large load electric
apparatus in the same circuit.

Momentary power failure : Check if there is a defective
contact or leak current in the
power supply circuit.

Noise : Check if there is any equipment causing harmonic
wave near electric line.(Neon bulb or electric
equipment that may cause harmonic wave)
Check the complete insulation of grounding.

Check Point 1-1 : Reset Power Supply and operate

Does Error indication show again?

When Input Current Sensor has detected 0A, while Inverter Compressor is
operating at higher than 56rps, after 1minute upon starting the Compressor.
(Except during the defrost operation)

02-19

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

Indicate or Display:

Refer to error code table.

Trouble shooting 16
OUTDOOR UNIT Error Method:

Detective Actuators:

Detective details:

Forecast of Cause :

OKOK

Check Point 2: Replace Main PCB

Outdoor unit Main PCB
Compressor

Trip detection

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

02-20

OKOK

Check Point 3: Replace Compressor

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

1. Outdoor unit fan operation defective, foreign matter on hear exchanger,
excessive rise of ambient temperature

2. Inverter PCB failure

3. Inverter compressor failure (lock, winding short)

"Protection stop by overcurrent generation after inverter compressor start
processing completed'' generated consecutively 10 times.
* The number of generations is reset if the start-up of
the compressor succeeds.

No obstructions in air passages?
Heat exchange fins clogged
Outdoor unit fan motor check
Ambient temperature not raised by the effect of other heat sources?
Discharged air not sucked in?

Check Point 1 : Check the outdoor unit fan operation, heat exchanger, ambient temperature

Indicate or Display:

Refer to error code table.

Trouble shooting 17
OUTDOOR UNIT Error Method:

Detective Actuators:

Detective details:

Forecast of Cause :

Check Point 2 : Check connection of around the Compressor components

OKOK

OKOK

Check Point 3: Replace Main PCB

Outdoor unit Main PCB
Compressor

Compressor motor control error

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

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

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

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

(Refer to PARTS INFORMATION 2)

For Compressor Terminal, Main PCB

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

02-21

Check Point 1 : Check Noise from Compressor

Turn on Power and check operation noise.

If an abnormal noise show, replace Compressor.

OKOK

Check Point 4: Replace Compressor

If Check Point 3 do not improve the symptom, change Compressor.

Indicate or Display:

Refer to error code table.

Trouble shooting 18

OUTDOOR UNIT Error Method:

Detective Actuators:

Detective details:

Forecast of Cause:

Check Point 3 : Check Outdoor unit fan motor

OK

OK

Outdoor unit fan motor error

Outdoor unit Main PCB
Outdoor unit Fan motor

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

4. Outdoor unit fan motor

Check Point 1 : Check rotation of Fan

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

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

Check Outdoor unit fan motor. (PARTS INFORMATION 5)
>>If Outdoor unit fan motor is abnormal, replace Outdoor unit fan motor.

Check Point 4 : Check Output Voltage of Main PCB

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

If the voltage is not correct, replace Main PCB.

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

Read wire DC voltage

Red - Black
(Vm)

240 - 400V (12/ 14L)

280 28V (09L)

White - Black
(Vcc)

15 1.5V

02-22

CN800
[09/12L]

CN801
[14L]

1
2
3
4
5
6
7

BLACK
WHITE
YELLOW

RED

FM

FAN MOTOR

Check Point 2 : Check ambient temp. around motor

OK

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

>>Upon the temperature coming down, restart operation.

Indicate or Display:

Refer to error code table.

BROWN

Trouble shooting 19
INDOOR UNIT Error Method:

Detective Actuators:

Detective details:

Forecast of Cause :

OKOK

OKOK

4-way valve error

Indoor unit Controller PCB
Heat Ex. 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.

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

5. 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

Remove CN30 (For 9/12L) and CN500 (For 14L) from PCB and check the resistance value of coil.
Resistance value is 1.88k 2.29k (at 20°C).

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

02-23

Cooling or Dry operation
[Indoor heat exchanger temp.] - [Room temp.] > 10degC

Heating operation
[Indoor heat exchanger temp.] - [room temp.] < - 10degC

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

[ Solenoid coil ]

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.

[ 4-way valve ]

OKOK

Check Point 4 : Replace Controller PCB

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

Check Point 2 : Check each thermistor

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

>> Check characteristics of thermistor (Refer to Trouble shooting 5, 6),
If defective, replace the thermistor

Indicate or Display:

Refer to error code table.

Trouble shooting 20

INDOOR UNIT

OUTDOOR UNIT Error Method:

Discharge temperature error

02-24

Indicate or Display:

Refer to error code table.

<Cooling operation>

OK

OK

OK

OK

OK

<Heating operation>

Outdoor unit Main PCB
Discharge temperature thermistor

"Protection stop by "discharge temperature 110degC during compressor
operation"" generated 2 times within 24 hours.

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

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

* For the characteristics of the thermistor, refer to the "Trouble shooting 12".

Check Point 4 : Check the discharge thermistor

EEV (EEV2, indoor unit EEV) open?

Strainer clogging check (before and after EEV, ACM
oil return)

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

Check for foreign object at heat exchanger
Check if fan can be rotated by hand.

Motor check (PARTS INFORMATION 5)

Check Point 2 : Check the EEV, strainer

Check Point 5 : Check the refrigerant amount

Leak check

EEV (EEV1, EEV2) open?

Strainer clogging check (before and after EEV, ACM
oil return)

Check Point 2 : Check the EEV, strainer

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

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

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

OK

Detective Actuators:

Detective details:

Forecast of Cause :

Refer to "Service Parts Information 3".

Refer to "Service Parts Information 3".

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

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

4. Discharge temperature thermistor failure 5. Insufficient refrigerant

6. Main PCB failure

Trouble shooting 21

Forecast of Cause:

OKOK

Indoor Unit - No Power

1. Power supply failure 2. External cause

3. Electrical components defective

Check Point 1 : Check Installation Condition

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

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

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

Instant drop ----- Check if there is a large load electric apparatus in the same circuit.

Momentary power failure ----- Check if there is a defective contact or leak current in
the power supply circuit.

Noise ----- Check if there is any equipment causing harmonic wave near electric line.
(Neon bulb or electric equipment that may cause harmonic wave)
Check the complete insulation of grounding.

02-25

2-3 TROUBLE SHOOTING WITH NO ERROR CODE

Check Point 3 : Check Electrical Components

YESYES

NO

Check the voltage of power supply.

>> Check if AC207 - 253V appears at Outdoor Unit Terminal L - N.

Check Fuse in Main PCB.

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

Check Varistor in Main PCB.

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

OK

Trouble shooting 22

Forecast of Cause:

Check Point 3 : Check Electrical Components

OKOK

OKOK

YESYES

OK

NO

Check Point 1 : Check Installation Condition

Outdoor Unit - No Power

1. Power supply failure 2. External cause

3. Electrical Components defective

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

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

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

Instant drop ----- Check if there is a large load electric apparatus in the same circuit.

Momentary power failure ----- Check if there is a defective contact or leak current in the power supply circuit.

Noise ----- Check if there is any equipment causing harmonic wave near electric line.
(Neon bulb or electric equipment that may cause harmonic wave)
Check the complete insulation of grounding.

Check the voltage of power supply.

>> Check if AC207 - 253V appears at Outdoor Unit Terminal L - N.

Check Fuse in Main PCB.

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

Check Varistor in Main PCB.

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

If the symptom does not change by above Check 3, replace Main PCB.

02-26

Trouble shooting 23

Forecast of Cause:

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

Check Point 1 : Check indoor and outdoor installation condition

Check Point 3 : Check Electrical Components at Indoor and Outdoor

OK

OK

OKOK

No Operation (Power is ON)

1. Setting/ Connection failure 2. External cause

3. Electrical component defective

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

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

Turn off Power and check/ correct followings.

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

Instant drop ----- Check if there is a large load electric apparatus in the same circuit.

Momentary power failure ----- Check if there is a defective contact or leak current in the power supply circuit.

Noise ----- Check if there is any equipment causing harmonic wave near electric line.
(Neon bulb or electric equipment that may cause harmonic wave)
Check the complete insulation of grounding.

>> If it is DC13V, Remote Control is failure. (Controller PCB is normal) >> Replace Remote Control
>> If it is DC 0V, Controller PCB is failure. (Check Remote Control once again)
>> Check Indoor unit fan motor. (PARTS INFORMATION 4)
If it is normal, replace Controller PCB.
If it is abnormal, replace Indoor unit fan motor and Controller PCB.

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

02-27

Check Voltage at CNC01 (terminal 1-3) of UTY-TWBXF(Communication kit).
(Power supply to Remote Control)

Attention

Trouble shooting 24

Forecast of Cause:

Check Point 2 : Check Outdoor unit operation

Check Point 1 : Check Indoor unit

Check Point 3 : Check Site condition

Check Point 5 : Check Refrigeration cycle

Check Point 4 :
Check Indoor/ Outdoor installation condition

Pipe (In) Pipe (Out)

Pipe (In) Pipe (Out)

OKOK

OKOK

OKOK

OKOK

MPa MPa

No Cooling / No Heating

1. Indoor Unit error 2. Outdoor Unit error

3. Effect by surrounding environment

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

Does Indoor unit Fan run on High fan?

Is Air filter dirty?
Is Heat exchanger clogged?

Check if Energy save function is operated.

Check if Outdoor unit is operating

Check any objects that obstruct the air flow route.

Check clogged Heat Exchanger.

Is the Valve open?

Is capacity of Indoor unit fitted to room size?

Any windows open? or direct sunlight ?

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

Check any loose or removed communication line.

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

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

Measure Gas Pressure and if there is a leakage, correct it.

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

Check EEV (PARTS INFORMATION 3)

Check Compressor (PARTS INFORMATION 1,2)
Check Heater Unit (PARTS INFORMATION 8)

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.

02-28

Trouble shooting 25

Forecast of Cause :

Trouble shooting 26

Forecast of Cause:

OK

OK

OK

OK

OKOK

OKOK

OKOK

MPa MPa

Abnormal Noise

1. Abnormal installation (Indoor/ Outdoor)

2. Fan failure (Indoor/ Outdoor)

3. Compressor failure (Outdoor)

Diagnosis method when abnormal noise is occurred

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

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

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

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

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

Is there any object which obstruct the Fan rotation?

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

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

Is Compressor locked?

>> Check Compressor (PARTS INFORMATION 1,2)

Water Leaking

1. Erroneous installation 2. Drain hose failure

Diagnosis method when water is spitting out.

Is the filter clogged?

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

Diagnosis method when water leak occurs

Is Drain hose connection loose?
Is there a trap in Drain hose?
Is Drain hose clogged?

Is Main unit installed in stable condition?
Is Main unit broken or deformed at the time of
transportation or maintenance?

Is Fan rotating?

02-29

SERVICE PARTS INFORMATION 1

MPa MPa

Compressor

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

Does not start up

Is there open or loose connection
cable?

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

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

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

Replace Compressor

Replace Compressor

Replace Compressor

Stops soon after starting up

Is there open or loose connection
cable?

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

Check if Refrigerant is leaking.
(Recharge Refrigerant)

Check if strainer is clogged.
(PARTS INFORMATION 3)

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

Abnormal noise

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

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

02-30

2-4 SERVICE PARTS INFORMATION

SERVICE PARTS INFORMATION 2

Check Point 1 : Check Connection

Check Point 2 : Check Winding Resistance

Check Point 3 : Replace Main PCB

C

S

R

Inverter Compressor

Check terminal connection of Compressor
(loose or incorrect wiring)

Check winding resistance of each terminal

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

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

02-31

R

S

(WHITE)

C

(BLACK)

Terminal cover opened

(RED)

S(V)

R(U)

(RED)

C(W)

(BLACK)

Terminal cover opened

(WHITE)

AO*G12/ 14L

AO*G09L

Resistance Value :

0.7 at 20°C

AO*G09L

Resistance Value :

1.4 at 25°C

AO*G12L

Resistance Value :

0.7 at 25°C

AO*G14L

SERVICE PARTS INFORMATION 3

Check Point 2 : Check Coil of EEV

Yellow - Red

Orange - Red

Blue - Red

White - Red

Read wire

46

4

Resistance value

Check Point 1 : Check Connections

Check Point 5 : Check Opening and Closing Operation of Valve

Check Point 3 : Check Voltage from Main PCB.

Check Point 4 : Check Noise at start up

Pipe (In)

Pipe (Out)

Hi TEMP.

Pipe (In)

Hi TEMP.

Normal TEMP.

CLOSE
Example : Hot Gas

OPEN
Example : Hot Gas

Pipe (Out)

Hi TEMP.

Pipe (In) Pipe (Out)

Pipe (In) Pipe (Out)

Check Point 6 : Check Strainer

DC

EXPANSION
VALVE COIL

EV

RED
BLUE
ORANGE
YELLOW
WHITE

1
2
3
4
5

at 20°C

Outdoor unit Electronic Expansion Valve
( EEV )

Check connection of connector (CN40)
( Loose connector or open cable )

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.

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

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

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

02-32

1
2
3
4
5

CN40
[09/12L]

CN700
[14L]

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: Earth terminal)

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

Pin number
(wire color)

Terminal function
(symbol)

1 (Red)

2

3

4 (Black)

5 (White)

6 (Yellow)

7 (Brown or Blue)

DC voltage (Vm)

No function

No function

Earth terminal (GND)

Control voltage (Vcc)

Speed command (Vsp)

Feed back (FG)

SERVICE PARTS INFORMATION 4

Check Point 1 : Check rotation of Fan

Indoor unit fan motor

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

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

Check Point 2 : Check resistance of Indoor Fan Motor

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

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

Pin number
(wire color)

Terminal function
(symbol)

1 (Blue)

2 (Yellow)

3 (White)

4 (Black)

5

6 (Red)

Feed back (FG)

Speed command (Vsp)

Control voltage (Vcc)

Earth terminal (GND)

No function

DC voltage (Vm)

02-33

SERVICE PARTS INFORMATION 6

Active filter module

02-34

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

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

L2L1

P

N

+IN

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

If it is abnormal,replace ACTIVE FILTER MODULE

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

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

Terminal

Resistance value

L2

L1

L1,L2

P

P

Control Box

N

N

(+IN)

(+IN)

( IN)

( IN)

Tester(+) Tester(-)

Check the open or short-circuit

L2

P

P

N

L2

L2

Check the diode

0

360k

720k

1.69M /

20%

+

-

360k

20%

+

-

20%

+

-

(Ref. value 1)

1.88M

(Ref. value 2)

1.40M /

(Ref. value 1)

2.28M

(Ref. value 2)

Terminal

Resistance value

Tester(+) Tester(-)

1.32M /

(Ref. value 1)

1.50M

(Ref. value 2)

1.40M /

(Ref. value 1)

1.51M

(Ref. value 2)

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

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

-IN

For AO*G14LTCN

SERVICE PARTS INFORMATION 7

IPM
(

Mounted on Transistor PCB)

02-35

Check Point 1

Check Point 2

Terminal

Resistance value

Tester(+) Tester(-)

 Disconnect the connection wires between the Transistor
PCB - Capacitor PCB and Transistor PCB - Inverter
Compressor.

 Set the tester to the "Resistance" mode, and measure
the resistance between the following terminals.

Set the tester to the "Diode" mode, and measure the voltage value between the following terminals.

 Judge the result of as follows:

Judge the result of as follows:

TM301 (P) - TM305(U) / TM304(V) / TM303(W)
TM302 (N) - TM305(U) / TM304(V) / TM303(W)

P

P

P

U

V

W

N

N

N

U

V

W

U

V

W

P

P

P

U

V

W

N

N

N

Over 2k
(Including )

Over 2k
(Including )

Over 20k
(Including )

Terminal

Tester display

Tester(+) Tester(-)

P

P

P

U

V

W

N

N

N

U

V

W

U

V

W

P

P

P

U

V

W

N

N

N

0.3V 0.7V

For AO*G14LTCN

SERVICE PARTS INFORMATION 8

Check Point 3 : Check Heater wire.

Black - White

Read wire Resistance value

Check Point 1 : Check Connections

Heater Unit

Check connection of connector
( Loose connector or open cable )

Remove connector, check resistance of Heater wire.

If Resistance value is abnormal, replace Heater Unit.

02-36

Check Point 2 : Check electrical components

Check Check Fuses.

CN10

1 2 3 4 5

3
2
1

3
2
1

1 2 3 4 5

BLACK

BLACK

WHITE

WHITE

BLACK

BLACK

WHITE

FUSE 250V5A

FUSE 250V5A

HEATER

THERMOSTAT
(55°C)

>> If Fuse is open, check connection, and replace Fuse.

321 ~ 368

AO*G14LTCN

AO*G09/ 12LTCN

CN112

1 2

1
2
3

1
2
3

1 2

BLACK

WHITE

WHITE

BLACK

BLACK

WHITE

FUSE 250V5A

HEATER

THERMOSTAT
(55°C)

(at 25°C)

3 . APPENDING DATA

R410A

WALL MOUNTED type

INVERTER

03-01

3-1. FUNCTION SETTING

Follow the instructions in the Local Setup Procedure, which is supplied with the remote control,
in accordance with the installed condition.
After the power is turned on, perform the Function Setting on the remote control.

The settings may be selected between the following two: Function Number or Setting Value.

Settings will not be changed if invalid numbers or setting values are selected.

3-1-1 INDOOR UNIT

( Factory setting)

Setting Description

Function Number Setting Value

Standard (400 hours)

Long interval (1000 hours)

Short interval ( 200 hours)

No indication

11

00

01

02

03

1-1. Setting the Filter Sign

The indoor unit has a sign to inform the user that it is time to clean the filter.
Select the time setting for the filter sign display interval in the table
below according to the amount of dust or debris in the room.
If you do not wish the filter sign to be displayed, select the setting value for "No indication".

( Factory setting)

Setting Description

Function Number Setting Value

Standard

Slightly lower control

Lower control

Warmer control

30

00

01

02

03

1-2. Cooling Room Temperature Correction

Depending on the installed environment, the room temperature sensor may require a correction.
The settings may be selected as shown in the table below.

( Factory setting)

Setting Description

Function Number Setting Value

Standard

Lower control

Slightly warmer control

Warmer control

31

00

01

02

03

1-3. Heating Room Temperature Correction

Depending on the installed environment, the room temperature sensor may require a correction.
The settings may be selected as shown in the table below.

03-02

( Factory setting)

Setting Description

Function Number Setting Value

Yes

No

40

00

01

( Factory setting)

Setting Description

Function Number Setting Value

No

Yes

42

00

01

1-4. Setting the Auto Restart

Enable or disable automatic system restart after a power outage.

1-5. Indoor room temperature sensor switching function
(Only for Wired remote controller)

The following settings are needed when use the control by
Wired remote controller temperature sensor.

( Factory setting)

Setting Description

Function Number Setting Value

A

B

C

D

44

00

01

02

03

1-6. Remote controller signal code

Change the indoor unit Signal Code, depending on the remote controllers.

( Factory setting)

Setting Description

Function Number Setting Value

Operation/Stop mode

(Setting forbidden)

Forced stop mode

46

00

01

02

1-7. External input control

"Operation/Stop" mode or "Forced stop" mode can be elected.

* If setting value is "00" : Room temperature is controlled by the indoor unit temperature sensor.
* If setting value is "01" : Room temperature is controlled by either indoor unit temperature sensor
or remote controller unit sensor.

03-03

Settings will not be changed if invalid numbers or setting values are selected.

After the power is turned on, perform the "FUNCTION SETTING" according to
the installation conditions using the remote controller.

This procedure changes to the function settings used to control the indoor unit
according to the installation conditions.
Incorrect settings can cause the indoor unit malfunction.

Entering the Function Setting Mode

While pressing the POWERFUL button and SET TEMP.( ) button simultaneously,
press the RESET button to enter the function setting mode.

3-1-2 Procedures to change the Function Setting for wireless RC

(2) Press the POWERFUL button to proceed to setting the value.
(Press the POWERFUL button again to return to the function number
selection.)

Selecting the Function Number and Setting Value

(5) Next, please press the START/STOP( ) button.
Please confirm that the beep sounds.

(6) Press the RESET button to cancel the function setting mode.

(7) After completing the FUNCTION SETTING, be sure to turn off the
power and turn it on again.

CAUTION

After turning off the power, wait 10 seconds or more
before turning on it again.
The FUNCTION SETTING doesn't become active unless
the power is turned off then on again.

(3) Press the SET TEMP.( ) ( ) buttons to select the setting value.
(Press the 10°C HEAT button to switch between the left and right digits.)

Function
Number

(1) Press the SET TEMP.( ) ( ) buttons to select the function number.
(Press the 10°C HEAT button to switch between the left and right digits.)

(4) Press the MODE button, in the order listed to confirm the setting.
Please confirm that the beep sounds.

Setting Value

03-04

(2) Press the MODE button for at least 5 seconds to display the current signal code.
(initially set to ).

(4) Press the MODE button again to return to the clock display.
The signal code will be changed.

Selecting the Remote Controller Signal Code

(3) Press the SET TEMP.( ) ( ) buttons to change the signal code
between .
Match the code on the display to the air conditioner signal code.

If no buttons are pressed within 30 seconds after the signal code is displayed,
the system returns to the original clock display.
In this case, start again from step 1.
The air conditioner signal code is set to A prior to shipment.

CAUTION

(1) Press the START/STOP( ) button until only the clock is displayed
on the remote controller display.

-10.0 58.2 0.73

-30.0 1131.9 0.21

-5.0 44.0 0.93 -25.0 804.5 0.29

0.0 33.6 1.15 -20.0 579.6 0.40

5.0 25.9 1.39 -15.0 422.9 0.53

10.0 20.2 1.66 -10.0 312.3 0.69

15.0 15.8 1.94 -5.0 233.2 0.88

20.0 12.5 2.22 0.0 176.0 1.10

25.0 10.0 2.50 5.0 134.2 1.36

30.0 8.0 2.77 10.0 103.3 1.63

35.0 6.5 3.03 15.0 80.3 1.92

40.0 5.3 3.27 20.0 62.9 2.21

45.0 4.4 3.49 25.0 49.7 2.51

30.0 39.6 2.79

35.0 31.7 3.06

40.0 25.6 3.30

45.0 20.8 3.53

50.0 17.1 3.73

55.0 14.1 3.90

60.0 11.6 4.05

63.0 10.4 4.14

Room temperature thermistor

Temp ( C)

Resistance(k )

Voltage(V)

Indoor heat exchanger thermistor

Temp ( C)

Resistance(k )

Voltage(V)

Discharge thermistor

Outdoor heat exchanger thermistor

Outdoor temperature thermistor

03-05

3-2. Thermistor Resistance Values

3-2-1 INDOOR UNIT

3-2-2 OUTDOOR UNIT

-30.0 1013.1 0.06

-25.0 729.1 0.09

-20.0 531.6 0.12

-15.0 392.3 0.16

-10.0 292.9 0.21

-5.0 221.1 0.28

0.0 168.6 0.36

5.0 129.8 0.46

10.0 100.9 0.57

15.0 79.1 0.71

20.0 62.5 0.86

25.0 49.8 1.03

30.0 40.0 1.23

35.0 32.4 1.43

40.0 26.3 1.65

45.0 21.6 1.88

50.0 17.8 2.11

55.0 14.8 2.34

60.0 12.3 2.57

65.0 10.3 2.79

70.0 8.7 3.00

75.0 7.4 3.19

80.0 6.3 3.37

85.0 5.4 3.54

90.0 4.6 3.69

95.0 4.0 3.83

100.0 3.4 3.96

105.0 3.0 4.07

110.0 2.6 4.17

115.0 2.3 4.26

120.0 2.0 4.33

Temp ( C)

Resistance(k )

Voltage(V)

-30.0 95.6 0.24

-25.0 68.9 0.32

-20.0 50.3 0.43

-15.0 37.2 0.57

-10.0 27.8 0.73

-5.0 21.0 0.92

0.0 16.1 1.14

5.0 12.4 1.39

10.0 9.6 1.65

15.0 7.6 1.93

20.0 6.0 2.21

25.0 4.8 2.49

30.0 3.8 2.77

35.0 3.1 3.02

40.0 2.5 3.26

45.0 2.1 3.48

50.0 1.7 3.68

55.0 1.4 3.85

60.0 1.2 4.00

65.0 1.0 4.13

70.0 0.8 4.25

75.0 0.7 4.35

80.0 0.6 4.43

Temp ( C)

Resistance(k )

Voltage(V)

-30.0 224.3 0.73

-25.0 159.7 0.97

-20.0 115.2 1.25

-15.0 84.2 1.56

-10.0 62.3 1.90

-5.0 46.6 2.26

0.0 35.2 2.61

5.0 26.9 2.94

10.0 20.7 3.25

15.0 16.1 3.52

20.0 12.6 3.76

25.0 10.0 3.97

30.0 8.0 4.14

35.0 6.4 4.28

40.0 5.2 4.41

45.0 4.2 4.51

50.0 3.5 4.59

55.0 2.8 4.65

Temp ( C)

Resistance(k )

Voltage(V)

1116,Suenaga,Takatsu-ku,Kawasaki 213-8502,Japan

September 2011 Printed in Japan