Fujitsu Siemens Computers AU* G45LRLA, AR* G45LMLA, AO* G45LETL, AR* G54LHTA, AO* G54LETL Service Instruction

SPLIT TYPE
ROOM AIR CONDITIONER

Cassette type
Duct type
Ceiling type

Models Indoor unit Outdoor unit

AU* G45LRLA
AR* G45LMLA
AR* G45LHTA
AB* G45LRTA

AU* G54LRLA
AR* G54LHTA

AO* G45LETL
AO* G54LETL

INVERTER

SERVICE

INSTRUCTION

R410A

CONTENTS

1. SPECIFICATIONS

1. DESCRIPTION OF EACH CONTROL OPERATION

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

1-4 AUTO CHANGEOVER OPERATION.........................................................................

1-5 INDOOR FAN CONTROL...........................................................................................

1-6 OUTDOOR FAN CONTROL.......................................................................................

1-7 COMPRESSOR CONTROL.......................................................................................

01-01

1-2 HEATING OPERATION..............................................................................................

01-02

1-3 DRY OPERATION.......................................................................................................

01-03

01-04
01-06
01-09

01-10

1-8 TIMER OPERATION CONTROL................................................................................

01-11

1-9 ELECTRONIC EXPANSION VALVE CONTROL.......................................................

01-15

1-10 TEST OPERATION CONTROL...............................................................................

01-15

1-11 PREVENT TO START FOR 3 MINUTES (3 MINUTES ST).....................................

01-16

1-12 4-WAY VALVE EXTENSION SELECT.....................................................................

01-16

1-13 AUTO RESTART......................................................................................................

01-16

1-14 PUMP DOWN...........................................................................................................

01-17

1-15 COMPRESSOR PREHEATING...............................................................................

01-18

1-16 10°C HEAT OPERATION (For AB type)..................................................................

01-18

1-20 VARIOUS PROTECTIONS.......................................................................................

01-22

1-21 COMPRESSOR STOP CONTROL...........................................................................

01-24

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

01-21

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

2. TROUBLE SHOOTING

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

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

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

02-01

02-30

02-04

02-35

1-18 DEFROST OPERATION CONTROL........................................................................

01-19

1-17 ECONOMY OPERATION.........................................................................................

01-18

1-27 DESCRIPTION OF DISPLAY UNIT..........................................................................

01-27

1-24 LOW NOISE OPERATION.......................................................................................

01-25

1-25 PEAK CUT OPERATION..........................................................................................

01-25

1-26 DRAIN PUMP OPERATION (For AU/ AR type)......................................................

01-26

1-23 EXTERNAL ELECTRICAL HEATER CONTROL.....................................................

01-25

1-22 FRESH AIR CONTROL............................................................................................

01-24

1 . DESCRIPTION OF EACH
CONTROL OPERATION

R410A

Cassette/ Duct/ Ceiling type

INVERTER

1-1. COOLING OPERATION

A sensor (room temperature thermistor) built in the indoor unit will usually perceive
difference or variation between a set temperature and present room temperature, and
controls the operation frequency of the compressor.
* If the room temperature is 2°C higher than a set temperature,
the compressor operation frequency will attain to maximum performance.

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

* When the room temperature is between +2°C to -2.5°C of the setting temperature,
the compressor frequency is controlled within the range shown in Table1.
However, the maximum frequency is limited in the range shown in Figure 1 based on the
fan speed mode and the outdoor temperature.

minimum
frequency

maximum
frequency

16rps

16rps

16rps
16rps

93rps

90rps

85rps

100rps

AU* G45LRLA
AR* G45LMLA
AB* G45LRTA
AR* G45LHTA
AU* G54LRLA
AR* G54LHTA

Hi Me Lo Qu

93rps
93rps
78rps
73rps

75rps
75rps
68rps
56rps

68rps
68rps
56rps
47rps

44rps
44rps
44rps
29rps

100rps
100rps
85rps
76rps

78rps
78rps
73rps
62rps

73rps
73rps
62rps
50rps

44rps
44rps
44rps
29rps

85rps
85rps
78rps
68rps

77rps
77rps
68rps
62rps

76rps
76rps
68rps
56rps

---

---

---

---

90rps
90rps
85rps
73rps

85rps
85rps
76rps
68rps

81rps
81rps
73rps
62rps

---

---

---

---

A zone
B zone
C zone

AU* G45LRLA
AR* G45LMLA
AB* G45LRTA

AU* G54LRLA

D-F zone
A zone
B zone
C zone
D-F zone
A zone
B zone

C zone

AR* G45LHTA

AR* G54LHTA

D-F zone

( Table 1 : Compressor Frequency Range )

( Fig. 1 : Limit of Maximum Frequency based on Outdoor Temperature )

01-01

A zone
B zone
C zone
D-F zone

Fan speed mode

1. DESCRIPTION OF EACH CONTROL OPERATION

Outdoor air
temperature

A zone

B zone

C zone

D zone

E zone

F zone

When the room
temperature rises

When the room
temperature drops

36°C

32°C

21°C

12°C

2°C

34°C

30°C

19°C

10°C

0°C

1-2. HEATING OPERATION

A sensor (room temperature thermistor) built in the indoor unit will usually perceive
difference or variation between a set temperature and present room temperature, and
controls the operation frequency of the compressor.
* If the room temperature is lower 3°C than a set temperature,
the compressor operation frequency will attain to maximum performance.

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

* When the room temperature is between +2.5°C to -3°C of the setting temperature,
the compressor frequency is controlled within the range shown in Table2.

( Table 2 : Compressor Frequency Range )

01-02

minimum
frequency

maximum
frequency

16rps

110rps

AU* G45LRLA
AR* G45LMLA
AB* G45LRTA
AR* G45LHTA
AU* G54LRLA
AR* G54LHTA

1-3. DRY OPERATION

The compressor rotation frequency shall change according to set temperature and room
temperature variation which the room temperature sensor of the indoor unit has detected
as shown in the Table 3.

( Table 3 : Compressor frequency )

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

01-03

Ts : Setting temperature

Ts+0.5°C

Ts+1.5°C

Operating
frequency

44rps

X zone

0rps

Y zone

Room Room
temperature temperature

X zone

Y zone

AU* G45LRLA
AR* G45LMLA
AB* G45LRTA
AR* G45LHTA
AU* G54LRLA
AR* G54LHTA

Compressor

ON

OFF

Indoor fan
Setting air flow

OFF

10 30 60 180 60 180 60 10 30

(sec)

S-Lo

Compressor

ON

OFF

Lo

OFF

30 180 120 180 30

(sec)

Indoor fan

ON

5 30 5

( Fig 3-2 : Indoor Fan Control for AR*G45/ 54LHTA )

( Fig 3-1 : Indoor Fan Control for AU*G45/ 54LRTA, AR*G45LMLA, AB*G45LRTA )

Indoor fan air flow *1

*1 : AU*G45LRLA ---> 470rpm, AU*G54LRLA ---> 480rpm
AB*G45LRTA ---> 680rpm, AR*G45LMLA ---> 670rpm,

1-4. AUTO CHANGEOVER OPERATION

01-04

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

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

Cooling mode

25°C

Heating mode

( Table 4 : Operation mode selection table )

Room temperature (TR)

TR> Ts+2°C

Ts+2°C TR Ts -2°C

*Middle zone

TR < Ts -2°C Heating

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

The same operation as COOLING OPERATION AND DRY OPERATION of page 01-01 is performed.
When the room temperature has remained at set temperature -1.5°C, operation is automatically
switched to Dry mode.
If the room temperature reaches set temperature +2°C during Dry mode, operation returns to Cooling.

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

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

1

1

2

3

1

4

1

( Fig.4 : Outdoor temperature zone selection )

Cooling

(Autmatic dry)

Operation mode

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

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

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

(2). Selected by the outdoor temperature.

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

Cooling

Cooling

Dry

Dry

Compressor stop

When the room
temperature drops

When the room
temperature rises

Ts +2°C

Ts -0.5°C

Ts -1.5°C

Ts +1°C

Ts -1.5°C

Ts -2.5°C

( Fig.5 : Auto changeover : Cooling - Dry )

TR : Room temperature
Ts : Setting temperature

TR : Room temperature
Ts : Setting temperature

( Air flow mode : Auto )

01-05

START

Room temp.

Ts+2°C?

COOLING (AUTO:DRY)

OPERATION

HEATING OPERATION

YES

YES

NO

NO

NO

AUTO CHANGEOVER operation flow chart

TS : Setting temperature

Room temp.

Ts -2°C?

Thermostat remains

in OFF state for 6 minutes or

longer?

System stops

or operation command other than

auto changeover operation?

NO

Thermostat remains

in OFF state for 6 minutes or

longer?

System stops

or operation command other than

auto changeover operation?

Middle zone

NO

Operation mode of

outdoor unit : Cooling or Dry?

YES

NO

Operation mode of outdoor unit

: Heating?

YES

NO

YES

Outdoor temperature

25°C?

NO

YES

YES

NO

YES

YES

1-5. INDOOR FAN CONTROL

1. Fan speed

( Table 5 : Indoor Fan Speed )

2. FAN OPERATION

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

01-06

AU* G45LRLA

Operation
mode

Air flow
mode

Speed
(rpm)

Hi
Me+
Me
Lo
Quiet
Cool air prevention
Hi
Me
Lo
Quiet
*Soft Quiet

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

Heating

Cooling
Fan

Dry
S-Lo

AU* G54LRLA

Operation
mode

Air flow
mode

Speed
(rpm)

Hi
Me+
Me
Lo
Quiet
Cool air prevention
Hi
Me
Lo
Quiet
*Soft Quiet

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

Heating

Cooling
Fan

Dry
S-Lo

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

AB* G45LRTA

Operation
mode

Air flow
mode

Speed
(rpm)

Hi
Me+
Me
Lo
Quiet
Cool air prevention
Hi
Me
Lo
Quiet
*Soft Quiet

1200
1100
1000
830
680
500
1200
1000
830
680
500
680
250

Heating

Cooling
Fan

Dry
S-Lo

AR* G45LMLA

Operation
mode

Air flow
mode

Speed
(rpm)

Hi
Me+
Me
Lo
Quiet
Cool air prevention
Hi
Me
Lo
Quiet
*Soft Quiet

1300

--­1020
840
670

--­1310
1020
840
670
420
670
420

Heating

Cooling
Fan

Dry
S-Lo

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

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

Operation
mode

Air flow
mode

Speed
(rpm)

Hi
Me
Lo

1300
1150
1000

Heating
Cooling
Fan

4. HEATING OPERATION

Switch the airflow [Auto], and the indoor fan motor will run according to a room temperature,
as shown in Fig.7.
On the other hand, if switched in [Hi] ~ [Lo], the indoor motor will run at a constant airflow
of [Heat] operation modes Lo, Me, Hi, as shown in Table 5.

01-07

( Fig.7 : Airflow change - over ( Heating : Auto ) )

3. COOLING OPERATION

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

( Fig.6 : 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

When the room
temperature rises

When the room
temperature drops

TR-Ts > -1°C

=

-2°C > TR-Ts

-1°C > TR-Ts > -2°C
=

TR-Ts > -1.5°C

=

-2.5°C > TR-Ts

-1.5°C > TR-Ts > -2.5°C
=

Lo mode

Me mode

Hi mode

*1 : Contains a condition to the following

When the operation mode is set to AUTO mode
at the start of operation.
When the setting temperature was changed.
When the operation mode was changed to Cooling mode.
When the airflow mode was changed to AUTO mode.

5. COOL AIR PREVENTION CONTROL (Heating mode)

6. DRY OPERATION

Refer to the Fig. 3-1, 3-2.
During the dry mode operation, the fan speed setting can not be changed.

7. [For AU*G45/ 54LRTA, AR*G45LMLA, AB*G45LRTA]
MOISTURE RETURN PREVENTION CONTROL (Cooling mode& Dry mode)

Switch the airflow [Auto] at cooling mode, and the indoor fan motor will run as shown in Fig.3-1.

8. [For AU*G45/ 54LRTA, AR*G45LMLA, AB*G45LRTA]
INDOOR UNIT FAN (CONTROL FOR ENERGY SAVING (Cooling mode))

Switch the airflow at cooling mode, and the indoor fan motor will run as shown in Fig.3-1.
It depends on the Function setting "Indoor unit fan control for energy saving".

01-08

The maximum value of the indoor fan speed is set as shown in Fig.8, based on the detected
temperature by the indoor heat exchanger sensor on heating mode.
When the compressor does not operate, the indoor fan motor operates [S-Lo] or [Stop] mode.

( Fig.8 : Cool Air Prevention Control )

[ AU*G45/ 54LRLA, AB*G45LRTA ]

[ AR*G45LMLA ]

*Hi
or setting fan mode

*Lo
or setting fan mode

37°C

29°C

32°C

24°C

Indoor heat exchanger
temperature rises

Indoor heat exchanger
temperature drops

Cool air
prevention

S-Lo

S-Lo

42°C

30°C

34°C

Indoor heat exchanger
temperature rises

Indoor heat exchanger
temperature drops

Hi

*Me+
or setting fan mode

*Lo
or setting fan mode

*Lo
or setting fan mode

*Lo
or setting fan mode

39°C

37°C

37°C

32°C

24°C

*Lower speed is selected.

42°C

30°C

34°C

Indoor heat exchanger
temperature rises

Indoor heat exchanger
temperature drops

Hi

*Me+
or setting fan mode

*Lo
or setting fan mode

39°C

37°C

37°C

32°C

24°C

*Lower speed is selected.

*Lower speed is selected.

Hi

*Lo
or setting fan mode

*Lo
or setting fan mode

37°C

29°C

32°C

24°C

Indoor heat exchanger
temperature rises

Indoor heat exchanger
temperature drops

*Lower speed is selected.

13 min. later

13 min. later

[ AR*G45/ 54LHTA ]

Setting fan mode

stop

27°C

Indoor heat exchanger
temperature

Setting fan mode

Lo

27°C

Indoor heat exchanger
temperature

13 min. later

1-6. OUTDOOR FAN CONTROL

1. Outdoor Fan Motor

Following table shows the fan speed of the outdoor unit.

*

The outdoor fan speed changes in the range mentioned above depending on the compressor
frequency and outdoor temperature.
(When the compressor frequency and outdoor temperature increase, the outdoor fan speed
also changes to the higher speed.
When the compressor frequency and outdoor temperature decrease, the outdoor fan
speed also changes to the lower speed.)

*

It runs at 500rpm for 20 seconds after starting up the outdoor fan.
However, the fan operates at 200rpm when the initial rotation speed is 300rpm or less.

01-09

( Table 6 : Fan speed of the outdoor unit )

AO* G45LETL
AO* G54LETL

After operating the defrost control function on heating mode except economy operation,
its speed becomes 900rpm(Upper) / 880rpm(Lower) regardless of the compressor speed.
However, it returns to the normal speed control when the defrosting operation does not function
for 240 minutes after releasing the defrost operation or when the outdoor temperature sensor
detection value becomes higher than 5℃.

*

The compressor and the fan start-up at the same time, and the fan stops after the compressor
stops and 60 seconds has passed.

*

The fan doesn't operates fan 10 seconds after the fan stops.

*

Cooling / Dry Heating

Upper fan
/Lower fan

850/800, 780/750, 750/700
540/520, 360/340, 290/270
480/ 0 , 400/ 0, 350/ 0
280/ 0

900/880, 850/830, 780/750
720/700, 570/550, 500/480
370/350, 300/280, 220/200

1-7. COMPRESSOR CONTROL

1. OPERATION FREQUENCY RANGE

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

Cooling Heating

Min

Max

Min Max

Dry

(Table 7 : Compressor Operation Frequency Range)

01-10

AO* G45LETL

16rps
16rps

93rps

----

85rps

----

----

100rps

----

90rps

AO* G54LETL

16rps
16rps

110rps
110rps

44rps
44rps

2. OPERATION FREQUENCY CONTROL AT START UP

The compressor frequency soon after the start-up is controlled as shown in Fig.9.

(Fig.9 : Compressor Control at Start-up)

39

90

57

68

180 420

85

(rps)

Upper

limit

speed

(sec)480

Elapsed time

39

200

57

68

700 840

85

(rps)

Upper

limit

speed

(sec)1010

Elapsed time

39

90

57

68

210 270

85

(rps)

Upper

limit

speed

(sec)300

Elapsed time

Ta : Outdoor temperature

< Normal start-up >
Immediate start-up after power-ON (cooling)

Immediate start-up after power-ON (Hearting Ta < 10℃)

Immediate start-up after power-ON (Hearting Ta > 10℃)

=

45LRLA
45LMLA
45LRTA

45LHTA 54LRLA 54LHTA

1-8. TIMER OPERATION CONTROL

1. ON / OFF TIMER

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

Operation mode

Stop mode

Set time of timer

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

Operation mode

Stop mode

Set time of timer

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

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

Operation mode

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

Both ON and OFF time must be set.

2. WEEKLY TIMER

2-1. WEEKLY TIMER

Stop mode

Stop mode

Stop mode

Operation mode

Operation mode

Set time

Set time Set time Set time

01-11

AR-WAE1E

1-8-1 Wired Remote Controller (with AU, AR model)

ON / TIMER
OFF / TIMER

WEEKLY TIMER

TEMPERATURE SET BACK TIMER

01-12

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

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

Normal

Next day setting

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

2-2. DAY OFF setting

Stop mode

Stop mode

Operation mode

Stop mode

Operation mode

Preceding day Next day

DAY OFF

Stop mode

Stop mode

Operation mode

Stop mode

Operation mode

DAY OFF

Setting day

Preceding day Next daySetting day

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

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

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

3. TEMPERATURE SET BACK TIMER

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

SET BACK setting

Operation
temperature

Operation
temperature

26°C

22°C

26°C

22°C

24°C

*1

ON OFF OFFON

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

Change the setting temperature:
22°C 24°C

01-13

AR- RAH2E

1. ON / OFF TIMER

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

Operation mode

Stop mode

Set time of timer

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

Operation mode

Stop mode

Set time of timer

2. PROGRAM TIMER

ON / TIMER
OFF / TIMER

PROGRAM TIMER

SLEEP TIMER

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

Operation mode

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

SLEEP timer operation cannot be combined with ON timer operation.

Stop mode

Stop mode

Stop mode

Operation mode

Operation mode

Set time

Set time Set time Set time

1-8-2 Wireless Remote Controller (with AB model)

01-14

3. SLEEP TIMER

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

Set temperature rises

( Ts : Set temperature )

Stop of operation

Set temperature lowers

( Ts : Set temperature )

Ts

Stop of operation

In the COOLING operation mode

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

Ts

+1°C

+2°C

-2°C

-1°C

-4°C

-3°C

Set

60min

In the HEATING operation mode

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

Set

30min

60min

90min

1-9. ELECTRONIC EXPANSION VALVE CONTROL

1-10. TEST OPERATION CONTROL

01-15

Under the condition where the air conditioner stops, press the MASTER CONTROL button and
the FAN CONTROL button simultaneously for 2 seconds or more, and the test operation control
mode will appear.
During test running, " " will display on the remote controller display.
Set the test operation mode, and the compressor will continue to run regardless of whatever
the room temperature sensor detects.
The test operation mode is released if 60 minutes have passed after setting up the test operation.

With Wired Remote Controller

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

Pulse range

53~480 pulse

(1) Pulse range of EEV

(2) The EEV is set up at 480 pulses when the compressor is stopped.

(3) Initialization (Input of 528 pulses toward closing direction) is operated under the following condition.

* When the power is turned on.

* 4 hours has passed since the last initialization, and 3 minutes has passed after the compressor stop.
(If 12 hours has passed since the last initialization, the compressor is compulsorily stopped.)

AO* G45LETL
AO* G54LETL

Cooling / Dry

Heating

Operation

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

With Wireless Remote Controller

The compressor won't enter operation status for 3 minutes 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 4-way valve is switched in 3 minutes later
after the compressor stopped.

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

[Operation contents memorized when the power is interrupted]

Operation mode
Set temperature

Set air flow

Timer mode and timer time (Set by wireless remote controller)

10°C HEAT (Wireless remote controller is in use)

ECONOMY

1-11. PREVENT TO RESTART FOR 3 MINUTES ( 3 MINUTES ST )

1-12. 4-WAY VALVE EXTENSION SELECT

1-13. AUTO RESTART

01-16

WARNING

Never touch electrical components such as the terminal blocks except the button on
the display board. It may cause a serious accident such as electric shock.

During the pump-down operation, make sure that the compressor is turned off
before you remove the refrigerant piping.
Do not remove the connection pipe while the compressor is in operation with 2-way
or 3-way valve open. This may cause abnormal pressure in the refrigeration cycle
that leads to breakage and even injury.

CAUTION

Perform the pump down operation before disconnecting any refrigerant pipe or
electric cable.

Collect refrigerant from the service port or the 3-way valve if pump down cannot be
performed.

In case of a group control system installation, do not turn the power off pump down is
completed in all outdoor units.
(Group control system installation described in “SPECIAL INSTALLATION
METHODS” in the installation manual of the indoor unit.)

Operate [PUMP DOWN] • button on the display board in the manner described
below.

LED display part

Button part

14.1. Preparation for pump down

Confirm that the power is off, and then open the service panel•

14.2. Pump down procedure

(1) Check the 3-way valves (both the liquid side and gas side) are opened.

(2) Turn the power on.

POWER

ERROR

PUMP

DOWN

LOW

NOISE

PEAK

CUT

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

Sign “ ”: Lights off, “ ”: Lights on

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

LED display lights on as shown in the above figure, and the fans and the
compressor start operating.

If the [PUMP DOWN] button is pressed while the compressor is operating, the •
compressor will stop, then start again in about 3 minutes.

(4) LED display will change as shown below about 3 minutes after the compressor

starts. Fully close the 3-way valve on the liquid pipe side at this stage.

If the valve on the liquid pipe side is not closed, the pump down cannot be •
performed.

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

the gas pipe side tightly.

If the valve on the gas pipe side is not closed, refrigerant may flow into the piping•
after the compressor stops.

Step (5)

Closing direction

Step (4)

Hexagon wrench

Liquid pipe

Gas pipe

Closing direction

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

Fans and compressor stop automatically.

If the pump down is successfully completed (the above LED display is shown), the •
outdoor unit remains stopped until the power is turned off.

(7) Turn the power off.

PUMP DOWN is completed.

(Note)

To stop pump down, press the [PUMP DOWN] button again.•
To start the pump down again after the compressor is automatically stopped due to an •
error, turn the power off and open the 3-way valves. Wait 3 minutes, turn the power on
and start the pump down again.

When starting the operation after completion of the pump down, turn the power off, •
and then open the 3-way valves. Wait 3 minutes, turn the power on and perform a test
run in the “COOL” operation mode.

If an error occurs, recover the refrigerant from service port.•

SW1 SW2 SW3 SW4 SW5

POWER

ERROR

PUMP

DOWN

LOW

NOISE

PEAK

CUT

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

Sign “ ”: Lights off, “ ”: Lights on

POWER

ERROR

PUMP

DOWN

LOW

NOISE

PEAK

CUT

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

Sign “ ”: Lights off, “ ”: Lights on

POWER

ERROR

PUMP

DOWN

LOW

NOISE

PEAK

CUT

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

Sign “ ”: Lights off, “ ”: Lights on

POWER

ERROR

PUMP

DOWN

LOW

NOISE

PEAK

CUT

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

Sign “ ”: Lights off, “ ”: Lights on

POWER

ERROR

PUMP

DOWN

LOW

NOISE

PEAK

CUT

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

Sign “ ”: Lights off

01-17

1-14. PUMP DOWN

1-15. COMPRESSOR PREHEATING

01-18

When the outdoor temperature is lower than 20°C and the all operation mode 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 temperature rises to 26°C or greater,
preheating is ended.

1-16. 10°C HEAT OPERATION (For AB type)

10°C HEAT operation functions by pressing 10°C HEAT button on the remote controller.
10°C HEAT operation is almost the same operation as below settings.

Mode Heating

Setting temperature 10°C

Fan mode AUTO

( Table8 )

1-17. ECONOMY OPERATION

The ECONOMY operation functions by pressing ECONOMY button on the remote controller.
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

( Table9 )

01-19

1-18. DEFROST OPERATION CONTROL

1. CONDITION OF STARTING THE DEFROST OPERATION

Integratingdefrost

(Constant monitoring)

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.

2. CONDITION OF THE DEFROST OPERATION COMPLETION

Defrost operation is released when the conditions becomes as shown in Table 13.

( Table 13 : Condition of defrost release )

Release Condition

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

The defrost operation starts as shown in the following Table 10, 11, and 12.

From 2nd and later

defrost after

starting operation

Less than 35 minutes More than 35 minutes

Does not operate

Compressor integrating operation time

( Table 10 : Condition of 1st defrost operation)

1st defrost

after

starting operation

Compressor integrating operation time

Less than 22 minutes More than 22 minutes More than 62 minutes

Does not operate

Outdoor heat exchanger temperature

Below -9°C

Outdoor heat exchanger temperature

Below -10°C

Outdoor heat exchanger temperature

Below -5°C

More than 240 minutes

( For long continuous operation )

Less than 10 minutes

( For intermittent operation )

Compressor integrating operation time

Outdoor heat exchanger temperature

Below -3°C

OFF count of the compressor

40 times

( Table 12 : Condition of Integrating defrost operation)

( Table 11 : Condition of 2nd defrost operation)

01-20

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 heat exchanger temperature: Over 10°C

or

Compressor ON time: Maximum 15 minutes

Defrost end

Compressor
integrating
operation:
Over 22 minutes

Compressor
integrating
operation:
Over 62 minutes

Outdoor
heat exchanger
temperature:
Below - 9°C

Outdoor
heat exchanger
temperature:
Below - 5°C

Compressor
integrating
operation:
Over 35 minutes

2nd and later defrost

Compressor : OFF
Outdoor fan motor : OFF
30 sec later 4-way valve : OFF
36 sec later compressor : ON

Compressor
integrating
operation:
Over 240 minutes

Integrating defrost

(Constant monitoring)

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

Defrost start

Outdoor
heat exchanger
temperature:
Below - 10°C

Outdoor
heat exchanger
temperature:
Below - 3°C

Compressor
OFF count :
40 times

1st defrost

1-19. OFF DEFROST OPEARTION CONTROL

01-21

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.

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

OFF Defrost Flow Chart

Heating operation stop

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

Defrost start

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

Outdoor heat exchanger temperature : Over 10°C

or

Compressor ON time : Maximum 15 minutes

Defrost end

2. OFF DEFROST RELEASE CONDITION

Release Condition

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

( Table 14 : OFF Defrost Release Condition )

OFF defrost operation is released when the conditions becomes as shown in Table 14.

1-20. VARIOUS PROTECTIONS

01-22

1. DISCHARGE GAS TEMPERATURE OVERRISE PREVENSION CONTROL

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

104°C 101°C 110°C

When the discharge temperature becomes higher than Temperature ,the compressor frequency
is decreased 14rps, and it continues to decrease the frequency for 14rps every 120 seconds until
the temperature becomes lower than Temperature .

When the discharge temperature becomes lower than Temperature , the control of
the compressor frequency is released.

When the discharge temperature becomes higher than Temperature ,the compressor is stopped
and the indoor unit LED starts blinking.

(Table15 : Discharge Temperature Over Rise Prevension Control / Release Temperature)

Temperature

Temperature

Temperature

[ Heating ]

[ Cooling ]

T0 > 50°C

=

T0: Outdoor temperature

Outdoor unit fan speed (rpm)

T0 < -15°C

50°C > T0 > 46°C

=

46°C > T0 > 40°C

=

40°C > T0 > 38°C

=

38°C > T0 > 31°C

=

31°C > T0 > 19°C

=

19°C > T0 > 13°C

=

13°C > T0 > 7°C

=

7°C > T0 > 0°C

=

0°C > T0 > -5°C

=

-5°C > T0 > -10°C

=

-10°C >T0 > -15°C

=

850/800 780/750 750/700 540/520 360/340 290/270 480/ 0 400/ 0 350/ 0 280/ 0

12.5/12.0 6.5/ 6.0

5.0/ 4.5

8.0/ 7.5

9.0/ 8.5

9.0/ 8.5

10.0/ 9.5

10.0/ 9.5

10.0/ 9.5 6.0/ 5.5

10.5/10.0

12.5/12.0

12.0/11.5 10.0/ 9.5

12.5/12.0

13.0/12.5

14.5/14.0

15.5/15.0 11.5/11.0

11.0/10.5

13.5/13.0

13.5/13.0

14.5/14.0

15.0/14.5

15.5/15.0

16.0/15.5

13.5/13.0

16.5/16.0

17.5/17.0

19.5/19.0 19.0/18.5 16.5/16.0

T0 > 20°C

=

T0: Outdoor temperature

Outdoor unit fan speed (rpm)

T0 < 12°C

20°C > T0 > 12°C

=

900/880 850/830 780/750 720/700 570/550 500/480 370/350 300/280 220/200

16.5/16.0

14.5/14.0

19.5/19.0

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

(Table 16 : Current Release Operation Value / Release Value)

2. CURRENT RELEASE CONTROL

01-23

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 17 : Anti-freezing Protection Operation / Release Temperature)

Outdoor temperature

Over than 10°C *1

or 12°C *2

Less than 10°C *1

or 12°C *2

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

4°C

7°C

13°C

Temperature Temperature

68°C

63°C

4. COOLING PRESSURE OVER RISE PROTECTION

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

Outdoor heat exchange
temperature

(Fig.10 : Cooling Pressure Over Rise Protection Control)

Compressor is OFF

The compressor frequency is
decreased 7rps every 120seconds.

Release of protection

5. LOW PRESSURE PROTECTION CONTROL (For Cooling mode)

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

<After the compressor start-up and 1 minute has passed>

(a).The detected value of pressure sensor is 0.02MPaG or less,
continues for 5 minutes, the compressor is stopped.
(b). When 7 minutes has passed and low pressure sensor detects
value is more than 0.05MPaG after the protection stop by (a),
the compressor restarts.
(c).When the protection (a) operates 5 times within 2 hours after the
restart by (b),
the error is displayed and the compressor stops. [Permanent stop]

0.78MPaG

0.68MPaG

Release of protection

-8 rps every 1 minute

Pressure

(Fig 12 : Anti freezing protection)

(a).When the low pressure value becomes 0.68MPaG or less
continues for 1 minute, the compressor speed -8 rps.
(b). When the low pressure value becomes 0.68MPaG or less
after the protection (a), the compressor continues speed -8 rps
every 1 minute until the detected value becomes more than

0.68MPaG.
(c). When the low pressure value becomes more than 0.78MPaG,
this protection is released.

0.05MPaG

0.02MPaG

Release of protection

Hold

Compressor stop

Pressure

(Fig 11 : Low pressure protection 1)

Hold

5-1. Low Pressure Protection 1

5-2. Low Pressure Protection 2

01-24

6. HEATING OVERLOAD PROTECTION

On heating mode, the compressor frequency is controlled as following based on the
detection value of the pressure sensor.

(Fig.13 : Heating Overload Protection Control)

4.1MPa
(65°C)

Compressor is OFF

The compressor frequency is
decreased 10rps every 60 seconds.

3.3MPa
(55°C)

3.0MPa
(50°C)

2.8MPa
(48°C)

Stable range

Release

The compressor frequency is
decreased 2rps every 60 seconds.

Release

- 20°C

Cooling

Heating

1-21. COMPRESSOR STOP CONTROL

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

(Table 18 : Operation temperature of compressor stop control)

Operation
temperature

Temperature

The fan motor for Fresh Air is operated in synchronization with the indoor fan operation
as shown in Fig.14.

1-22. FRESH AIR CONTROL

(Fig.14 : Fresh Air control)

ON

OFF

ON

OFF

Fan motor
(Indoor unit)

Control signal
(for Fresh Air)

12V

Condensing pressure
(Indoor heat ex. temp.)

4.1MPa
(65°C)

Compressor is OFF

The compressor frequency is
decreased 15rps every 120 seconds.

3.5MPa
(57°C)

3.3MPa
(55°C)

3.0MPa
(50°C)

Stable range

Release

The compressor frequency is
decreased 2rps every 120 seconds.

Release

Condensing pressure
(Indoor heat ex. temp.)

[AR*G45/54LHTA] [Other models]

01-25

Operation mode : Heating mode
Compressor : ON
Indoor fan : ON

Model type : Heat pump

1-23. EXTERNAL ELECTRICAL HEATER CONTROL (For AR type)

(Fig 15 : External Electrical Heater control)

When the room
temperature rises

When the room
temperature drops

Ts : Setting temperature

Heater : OFF

Heater : ON

Heater : OFF

Ts -10°C

Ts -1°C

Ts -3°C

Ts -12°C

The External Electrical Heater operates when it meets all the following conditions.

1-24. LOW NOISE OPERATION

Low Noise mode

LEVEL 1

LEVEL 2

LEVEL 3

Cooling

Heating

Cooling

Heating

Cooling

Heating

Outdoor fan speed
(Upper / Lower)
[rpm]

Compressor speed [rps]

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

( Table 19 : Detail of Low Noise Operation )

540 / 520

570 / 550

540 / 520

570 / 550

540 / 520

570 / 550

68

75

54

62

48

54

75

85

58

68

48

54

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

AO*G45L AO*G54L

1-25. PEAK CUT OPERATION

(Table 20 : Outline of Peak Cut Operation )

LEVEL 1 LEVEL 2 LEVEL 3 LEVEL 4

100%

75%50%

Forced

thermostat-OFF

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

PEAK CUT LEVEL

Peak Cut

For Rated Capacity

*Percentage is rated electrical power ratio.

01-26

1-26. DRAIN PUMP OPERATION (For AU/ AR type)

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

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

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

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

5. When the float switch turns ON continuously for 3 minutes, "FAILURE INDICATION" operates.
(It is necessary to turn off power for release it. )

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

1

2

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

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

1

During Cooling / Dry mode

3 minutes

ON

OFF

ON

OFF

Compressor

Drain Pump

3 minutes

3 minutes ST

ON

OFF

ON

OFF

ON

OFF

ON

OFF

Float Switch

Compressor

Indoor Fan

Drain Pump

3 minutes

ON

OFF

ON

OFF

Float Switch

Drain Pump

During Heating / Fan mode / Stop operation

<Float Switch turns OFF less than 3 minutes>

Less than 3 minutes

.

.

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

3

(Fig 16 : Detail of Drain Pump Operation)

01-27

1-27. DESCRIPTION OF DISPLAY UNIT

•

Display lamp

Function or operation method

(1) POWER / MODE

Green

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

(2) ERROR

Red

Blinks during abnormal air-conditioner operation.

(3) PUMP DOWN
(L1)

Orange

Lights on during pump down operation.

(4) LOW NOISE MODE
(L2, L3)

Orange

Lights on during “Low noise” mode when local setting is activated.
(Lighting pattern of L2 and L3 indicates low noise level)

(5) PEAK CUT
(L4, L5, L6)

Orange

Lights on during “Peak cut” mode when local setting is activated.
(Lighting pattern of L4, L5 and L6 indicates peak cut level)

SW1 SW2 SW3 SW4 SW5

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

LED DISPLAY

Various settings can be adjusted by changing Push switches on the board of the outdoor unit.

( Excerpt from the "INSTALATION MANUAL" )

Switch

Function or operation method

SW1 To switch between “Local setting” and “Error code display”.

SW2

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

SW3

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

SW4

To return to “Operation status display”.

SW5 To start the pump down operation.

MODE

SELECT

ENTER

EXIT / INITIALIZE

PUMP DOWN

PUSH SWITCH

1-00. ERROR HISTORY MODE

1-27-1 Layout of Display Unit



01-28

•

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

LED

Power / Mode

LED

Display Item

Compressor frequency

Upper fan speed (Outdoor unit)

Lower fan speed (Outdoor unit)

EEV pulse

Pressure sensor value (Low pressure range)

Pressure sensor value (High pressure range)

Outdoor air temperature sensor value

Discharge temperature sensor value

Heat-exchanger temperature sensor value (Middle)

Current value

Present Value
Of
Each Item

1

Compressor accumulated time

(Table :21 Procedure for Present Value)

Procedure

Operation

Power

Mode

Error L1 L2 L6L5L4L3

1

2

3

4

During status display, press the MODE SWITCH 1 time.

(Status display : Outdoor unit is stopping and no error)

When the EXIT SWITCH is pressed, this mode ends

and returns to the status display.

Selecting display items can be done by pressing

the SELECT SWITCH. (Return to Procedure 3)

Press the ENTER SWITCH.

(Data is displayed by lighting LED. Refer to Table : 23)

When the POWER / MODE LED blinking 1 time,

press the ENTER SWITCH.

1

1

1

1

DATA

: Light ON: Light OFF : Blinking 1 : 1 Time Blinking

1-00. ERROR HISTORY MODE

1-27-2 Display mode

(Table :22 Display pattern)

: Light ON: Light OFF n : n Time Blinking

5

1

Press the SELECT SWITCH and adjust to DISPLAY ITEM

(from L1 to L3) that you want to confirm. (Refer to Table : 22)

ERROR

L1 L2 L3

: Blinking

(Table 23 : Detail of LED Display Data)

: Light ON: Light OFF 1 : 1 Time Blinking

Item No,

Display Item

Power
Mode

Error L1 L2 L6L5L4L3

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

Compressor
Frequency
( 0 ~ 95rps )

Outdoor Unit Upper
Fan Speed
( 0 ~ 900rpm )

Outdoor Unit
Lower Fan Speed
( 0 ~ 900rpm )

EEV Pulse
( 0 ~ 480pulse )

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

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

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

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

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

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

~ 0.0

0.01 ~ 0.3

0.31 ~ 0.6

0.61 ~ 0.9

0.91 ~ 1.2

1.21 ~ 1.5

1.51 ~ 1.8

1.81 ~ 2.1
~ 2.1

2.11 ~ 2.4

2.41 ~ 2.7

2.71 ~ 3.0

3.01 ~ 3.3

3.31 ~ 3.6

3.61 ~ 3.9

3.91 ~ 4.2

01-29

1

2

3

4

5

6

: Light ON: Light OFF 1 : 1 Time Blinking

Item No,

Display Item

Power
Mode

Error L1 L2 L6L5L4L3

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

Outdoor Air
Temperature
( -30 ~ 70°C )

Discharge
Temperature
( -30 ~ 120°C )

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

Current ( 0 ~ 10A )

Compressor
Accumulated Time
( H )

~ -15

-15 ~ -5

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

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

~ 0.0

0.0 ~ 1.5

1.5 ~ 3.0

3.0 ~ 4.5

4.5 ~ 6.0

6.0 ~ 7.5

7.5 ~ 9.0

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

7

8

9

01-30

<Round up by 1hour>

10

11

01-31

1-00. ERROR HISTORY MODE

•

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

(Table : 24 Procedure for History Mode )

Procedure Operation

Power

Mode

1

2

3

4

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

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

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

Press the ENTER SWITCH, Error code is displayed by
lighting LED. (Refer to Table : 26)

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

: Light ON: Light OFF : Blinking 2 : 2 Times Blinking

n : n Times Blinking

1-27-3 Error history mode

Error L1 L2 L6L5L4L3

2

2

2

2

2

5

Press the SELECT SWITCH and adjust to DISPLAY ITEM
(from L1 to L3) that you want to confirm. (Refer to Table : 25)



n n

DATA

LED

Power / Mode

LED

Display Item

ERROR

L1 L2 L3

(Table :25 Display pattern)

: Light ON: Light OFF n : n Time Blinking

: Blinking

Newest error code

Error code before 1 time

Error Code

2

Error code before 2 times

01-32

1-00. ERROR HISTORY MODE

1-27-4 ERROR CHECK MODE

•

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

Confirm Chapter 2 " TROUBLE SHOOTING" in detail.

(Table : 27 Procedure for Error Check Mode )

Procedure Operation

Power

Mode

1

2

3

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

When reset of the ERROR history,
and then long press the MODE SWITCH.

Error code is displayed by lighting LED.
(Refer to Table : 26)

: Light ON: Light OFF 2 : 2 Times Blinking

n : n Times Blinking

Error L1 L2 L6L5L4L3

2

n

Blinking
Hi-speed

n

DATA

2 2 2 2 2 2 2 2

After the error reset ,all LED is blinking and erased the all error history .

After this, ERROR LED is off and will normal display.

Error Contents

Power
Mode

Error

Serial forward transfer error(after operation)

2

2

2

2

2

2

2

2

2

2

2

1

1 ~ : 1~ 15 Times Blinking 15

(Table : 26 Error Code)

L1 L2 L6L5L4L3

IPM Error

Indoor Unit Error

Inverter Error

Over Current Error

Discharge Thermistor Error

Outdoor Thermistor Error

Heat Sink Thermistor Error

Current sensor Error

Pressure sensor Error

Heat Ex. Liquid Middle
Thermistor Error

Compressor Thermistor Error

Compressor Control Error

Outdoor Unit Fan Motor 1 Error

Outdoor Unit Fan Motor 2 Error

4-way Valve Error

Discharge Temp. Error

Compressor Temp. Error

Low Pressure Error

2

2

2

2

2

2

2

2

2

2

2

1

1

1

5

6

3

6

5

7

1

7

2

7

3

7

3

7

4

7

7

8

4

8

6

8

6

9

4

9

5

9

7

9

8

9

9

10

1

10

3

10 5

15

Serial forward transfer error(during operation)

Heat Ex. Liquid Outlet
Thermistor Error

High Pressure Switch Error

: Light ON: Light OFF 2 : 2 Times Blinking

2 . TROUBLE SHOOTING

R410A

Cassette/ Duct/ Ceiling type

INVERTER

Indoor Room Thermistor Error

Wired Remote Controller
Communication Error

Error Contents

Trouble
shooting

02-01

2-1 ERROR DISPLAY

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

Serial Communication Error

Indoor Unit Fan Motor1 Error

Indoor Heat Ex. Thermistor Error

Drainage Error

1,2

3

4

5

6

7

8

9

1- 9

10

11

12

13

14

15

16

IPM Error

Error
Code

11

12

39

41

42

51

53

59

5U

63

65

71

72

73

74

77

Fan Motor Driving Circuit Error

Indoor Unit Error

Inverter Error

Indoor Unit Fan Motor2 Error

Error Contents

Trouble
shooting

17

18

19

20

21

22

23

24

25

26

Error
Code

84

86

94

95

97

98

99

A1

A3

A5

Over Current Error

Discharge Thermistor Error

Outdoor Thermistor Error

Heat Sink Thermistor Error

Current sensor Error

Pressure sensor Error

Heat Ex. Liquid Outlet
Thermistor Error

Compressor Thermistor Error

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

1. SELF - DIAGNOSIS

SUMOTUWETH FR

SA

Unit number (usually 0)

Error code

ex. Self-diagnosis check

Compressor Control Error

Outdoor Unit Fan Motor 1 Error

Outdoor Unit Fan Motor 2 Error

4-way Valve Error

Discharge Temp. Error

Compressor Temp. Error

Low Pressure Error

02-02

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

0 1 2 3 4 5 6 7
F E d c b A 9 8





Lower

Raise

Trouble shooting 1
OUTDOOR UNIT Error Method:

Detective Actuators: Detective details:

Forecast of Cause:

OK

Indicate or Display:

Refer to error code table.

YESYES

NO

Serial Communication Error
(Serial Reverse Transfer Error)

Outdoor unit Main PCB
Outdoor unit Fan motor

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

5. Transistor PCB (IPM) failure 6. Filter PCB failure 7. Outdoor unit Fan motor failure

Check Point 1-1 : Reset the power and operate

Does error indication reappear?

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

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

Check Point 2 : Check connection

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

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

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

Check Point 3 : Check the voltage of power supply

Check the voltage of power supply

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

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

02-04

2-2 TROUBLE SHOOTING WITH ERROR CODE

OK

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

Check serial signal (Reverse transfer signal)

>> Check if indicated value swings between AC90V and AC270V at outdoor unit terminal 1 - 3.
>> If it is abnormal, Check the parts as follows.

- Outdoor unit fan motor (PARTS INFORMATION 5)

- Active filter module (PARTS INFORMATION 4)

- Transistor PCB (IPM) (PARTS INFORMATION 7)

- Filter PCB (Check the wire of CN110)
>> If Outdoor fan motor is abnormal, replace Outdoor unit fan motor and Main PCB.
>> If Active filter module or IPM is abnormal, replace it.
>> If the parts are normal, replace Main PCB.

1

2

3

L

N

RED

WHITE

BLACK

BLACK

WHITE

+

-

Trouble shooting 2
INDOOR UNIT Error Method:

Detective Actuators: Detective details:

Forecast of Cause:

OK

Indicate or Display:

Refer to error code table.

YESYES

NO

OK

Serial Communication Error
(Serial Forward Transfer Error)

Indoor unit Controller PCB

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

Check Point 1-1 : Reset the power and operate

Does error indication reappear?

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

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

Check Point 2 : Check connection

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

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

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

Check Point 3 : Check the voltage of power supply

Check the voltage of power supply

>> Check if AC198V(AC220V-10%) - 268V(AC240V+10%) appears
at outdoor unit terminal L - N.

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

Check serial signal (Forward transfer signal)

>> Check if indicated value swings between AC30V and AC130V at outdoor unit terminal 2 - 3.
>> If it is abnormal, replace Controller PCB.

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

02-05

1

2

3

L

N

RED

WHITE

BLACK

BLACK

WHITE

+

-

Trouble shooting 3
INDOOR UNIT Error Method:

Detective Actuators: Detective details:

Forecast of Cause:

Check Point 2 : Check Wired Remote Controller and Controller PCB

Check Point 1 : Check the connection of terminal

OKOK

Indicate or Display:

Wired Remote Controller
Communication Error

Indoor unit Controller PCB
Wired Remote Controller

1. Connection failure 2. Wired Remote Controller failure 3. Controller PCB failure

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

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

02-06

Refer to error code table.

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

Check Voltage at CN14 (AU*G45/54LRLA, AR*G45LMLA, AB*G45LRTA), CN6 (AR*G45/54LHTA)
of Controller PCB. (terminal 1-3) (Power supply to Remote Control)

Trouble shooting 4
INDOOR UNIT Error Method:

Indicate or Display:

Detective Actuators: Detective details:

Forecast of Cause :

Fan Motor Drive Circuit Error

Indoor Unit Power Supply PCB

When a momentary power cut off.
When do not start fan motor.

1. External cause 2. Conenection of connector failure 3. Power Supply PCB failure

Check Point 3 : Replace Power supply PCB

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

02-07

Refer to error code table.

OKOK

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

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

in the power supply circuit.

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

OKOK

Detective Actuators:

Indoor Unit Controller PCB Circuit
Indoor Temperature Thermistor

Detective details:

Indoor unit thermistor is open or short is detected always.

Forecast of Cause :

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

Check Point 2 : Remove connector and check Thermistor resistance value

Thermistor Characteristics (Rough value)

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

Check Point 1 : Check connection of Connector

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

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

6.58.0

10.012.515.820.225.933.6

4.355.3Resistance value (k )

OK

OK

02-08

Trouble shooting 5
INDOOR UNIT Error Method:

Indicate or Display:

Indoor Room Thermistor Error

Refer to error code table.

Temperature (°C )

Temperature (°C )

0

40 45

5

44.058.2

-10 -5 10 15 20 25

30 35

Resistance value (k )

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.

H/E (MID) Thermistor

Room Temp. Thermistor

AR*G45LMLA

BLACK
BLACK

121

2

1 1
2 2

1 1
2 2

CN5

CN8

GRAY
GRAY

1
2

CN7

H/E (MID) Thermistor

Room Temp. Thermistor

AR*G45/ 54LHTA

BLACK
BLACK

121

2

1 1
2 2

CN8

GRAY
GRAY

CN7

H/E (MID) Thermistor

Room Temp. Thermistor

AU*G45/ 54LRLA

RED
RED

121

2

1 1
2 2

CN5

CN8

BLACK
BLACK

1
2

CN7

121

2

121

2

1
2

H/E (MID) Thermistor

Room Temp. Thermistor

BLACK
BLACK

CN5

CN8

GRAY
GRAY

CN7

BLACK
BLACK

AB*G45LRTA

Thermistor Characteristics (Rough value)

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

Detective Actuators:

Indoor Unit Controller PCB
Heat Exchanger (MID) Thermistor

Detective details:

Indoor unit thermistor is open or short is detected always.

Forecast of Cause :

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

Check Point 1 : Check connection of Connector

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

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

OK

Check Point 2 : Remove connector and check Thermistor resistance value

02-09

Trouble shooting 6
INDOOR UNIT Error Method:

Indicate or Display:

Indoor Heat Ex. Thermistor Error

Refer to error code table.

31.739.649.7

62.980.3103.3134.2176.0

17.120.825.6Resistance value (k )

Temperature (°C )

Temperature (°C )

0

40 45 50

14.15511.66010.4

63

5 10

1131.9

-30

579.6

-20

312.3

-10

233.2

-5 15 20

25 30 35

Resistance value (k )

OK

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.

H/E (MID) Thermistor

Room Temp. Thermistor

AR*G45LMLA

BLACK
BLACK

121

2

1 1
2 2

1 1
2 2

CN5

CN8

GRAY
GRAY

1
2

CN7

H/E (MID) Thermistor

Room Temp. Thermistor

AR*G45/ 54LHTA

BLACK
BLACK

121

2

1 1
2 2

CN8

GRAY
GRAY

CN7

H/E (MID) Thermistor

Room Temp. Thermistor

AU*G45/ 54LRLA

RED
RED

121

2

1 1
2 2

CN5

CN8

BLACK
BLACK

1
2

CN7

121

2

121

2

1
2

H/E (MID) Thermistor

Room Temp. Thermistor

BLACK
BLACK

CN5

CN8

GRAY
GRAY

CN7

BLACK
BLACK

AB*G45LRTA

02-10

Trouble shooting 7
INDOOR UNIT Error Method:

Indicate or Display:

Indoor Unit Fan Motor1 Error

Refer to error code table.

Detective Actuators:

Detective details:

Forecast of Cause:

Check Point 1 : Check rotation of Fan

Check Point 2 : Check ambient temp. around motor

OK

OK

OK

Indoor unit Power Supply PCB
Indoor unit fan motor

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

4. Power Supply PCB failure 5. Indoor unit fan motor failure

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

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

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

>>Upon the temperature coming down, restart operation.

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

Check Point 4 : Replace Power Supply PCB

If Check Point 1- 3 do not improve the symptom, replace Power Supply 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.

Refer to error code table.

Trouble shooting 8
INDOOR UNIT Error Method:

Drainage Error

Indicate or Display:

Detective Actuators:

Indoor Unit Controller PCB Circuit
Float Switch

Detective details:

When Float switch is ON for more than 3 minutes.

Check Point 1 : Check Float Switch

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

by using a meter.

>>If Float switch is abnormal, replace it.

ON OFF

OK

Forecast of Cause : 1. Float switch failure 2. Shorted connector/wire 3. Controller PCB failure

4. Drain pump failure 5. Hose clogging

Check Point 2 : Check Connector and Wire

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

>>Replace Float switch if the wire is abnormal

Check Point 4 : Check Controller PCB

If Check Point 1 ~ 3 do not improve the symptom, change

Controller PCB and execute the check operation again.

Attention!!

Wall mount / Small size wall mount type
does not have a float switch.
In this case, replace Controller PCB
and set up the original address.
Please refer to.

OK

OK

Check Point 3 : Check Drain Hose

Check Drain Hose .

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

02-11

02-12

Trouble shooting 9
INDOOR UNIT Error Method:

Indicate or Display:

Indoor Unit Fan Motor2 Error

Refer to error code table.

Detective Actuators:

Detective details:

Indoor unit Power Supply PCB
Indoor unit fan motor

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

Forecast of Cause:

Check Point 1 : Check rotation of Fan

Check Point 2 : Check ambient temp. around motor

OK

OK

OK

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

4. Power Supply 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.

Check Point 4 : Replace Power Supply PCB

If Check Point 1- 3 do not improve the symptom, replace Power Supply 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.

Refer to error code table.

Inverter Error

YES

NO

OK

Check Point 1-2 : External cause

Inverter PCB

Error information received from Inverter PCB

1. External cause. 2. Power supply to Filter PCB to Inverter PCB
wiring disconnection, open 3. Filter PCB failure 4. Inverter PCB failure

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

power line.

Check Point 2 : Check the wiring (Power supply to Filter PCB to Inverter PCB)

Connector and wiring connection state check
Cable open check

Replace Filter PCB and Inverter PCB.

Check Point 1-1 :
Turn the power on again?

Error displayed again?

Check Point 3 : Replace Filter PCB (INV) and Inverter PCB

02-13

Trouble shooting 10

Indicate or Display:

Detective Actuators:

Detective details:

OUTDOOR UNIT Error Method:

Forecast of Cause :

Detective Actuators:

Detective details:

Forecast of Cause :

Check Point 3 : Check Outdoor Fan

OK

OK

Check Point 5 : Replace Main PCB

OKOK

OKOK

Check Point 1 : Check connections of Outdoor Unit Electrical Components

Outdoor unit Main PCB
Compressor

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

3. Outdoor Heat Exchanger clogged 4. Compressor failure 5. Main PCB failure

Check if connector is removed.

Check if the terminal connection is loose.

Check erroneous connection.
Check if cable is open.

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

Check Point 2 : Check Outdoor Fan, Heat Exchanger

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

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

Check Outdoor Fan Motor. (Refer to Trouble shooting 21,22)

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

Check Point 4 : Check Compressor

(PARTS INFORMATION 2)

Check Compressor.

If Check Point 1 4 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.

02-14

Trouble shooting 11
OUTDOOR UNIT Error Method:

IPM Error

Indicate or Display:

Refer to error code table.

Refer to error code table.

Discharge Thermistor Error

OK

OK

D

C

CN62

THERMISTOR

(COMP SHELL)

THERMISTOR

(DIS.TEMP.)

BLACK

BLACK

BLA

C

K

BLA

C

K

1 2 3 4

1 2 3 4

Discharge temperature thermistor

Discharge temperature thermistor short detected
Discharge thermistor open detected

1. Connector connection failure, open

2. Thermistor failure

3. Main PCB failure

Check Point 1 : Check the connector connection and cable open

Connector connection state check
Cable open check

Check Point 2 : Check the thermistor

Thermistor characteristics check (Disconnect the thermistor from the PCB and check.)
* For the thermistor characteristics, refer to the "Service Parts Information 8".

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

Main PCB (CN62:1-2) voltage value = 5V
Remove the thermistor from Main PCB, check the voltage.

If the voltage does not appear, replace Main PCB,

and execute the check operation again.

Discharge temperature thermistor (CN62:1-2)

02-15

Trouble shooting 12

Indicate or Display:

Detective Actuators:

Detective details:

OUTDOOR UNIT Error Method:

Forecast of Cause :

Refer to error code table.

Compressor Thermistor Error

D

C

Compressor temperature thermistor

Compressor temperature thermistor short detected
Compressor thermistor open detected

1. Connector connection failure, open

2. Thermistor failure

3. Main PCB failure

OK

Check Point 1 : Check the connector connection and cable open

Connector connection state check

Cable open check

Check Point 2 : Check the thermistor

Thermistor characteristics check (Disconnect the thermistor from the PCB and check.)
* For the thermistor characteristics, refer to the "Service Parts Information 8".

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

Main PCB (CN62:3-4) voltage value = 5V
Remove the thermistor from Main PCB, check the voltage.

Compressor temperature thermistor (CN62:3-4)

If the voltage does not appear, replace Main PCB, and execute

the check operation again.

02-16

Trouble shooting 13

Indicate or Display:

Detective Actuators:

Detective details:

OUTDOOR UNIT Error Method:

Forecast of Cause :

CN62

THERMISTOR

(COMP SHELL1)

THERMISTOR

(DIS.TEMP.1)

BLACK

BLACK

BLA

C

K

BLA

C

K

1 2 3 4

1 2 3 4

Refer to error code table.

DC

CN63

THERMISTOR

THERMISTOR

(HEX.PIPE MID)

(HEX. PIPE. OUT.)

BLACK

BLACK

1 2 3

4

1 2 3

4

BLACK

BLA

C

K

Heat exchanger liquid temperature
thermistor

Heat exchanger outlet temperature thermistor short or open detected

1. Connector connection defective, open

2. Thermistor failure

3. Main PCB failure

OK

OK

Check Point 1 : Check the connector connection and cable open

Connector connection state check

Cable open check

Check Point 2 : Check the thermistor

Thermistor characteristics check (Disconnect the thermistor from the PCB and check.)
* For the thermistor characteristics, refer to the "Service Parts Information 8".

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

Main PCB (CN63:1-2) voltage value = 5V
Remove the thermistor from Main PCB, check the voltage.

Heat exchanger outlet temperature thermistor (CN63:1-2)

If the voltage does not appear, replace Main PCB, and execute

the check operation a

02-17

Heat Ex. Outlet Temp.
Thermistor Error

Trouble shooting 14

Indicate or Display:

Detective Actuators:

Detective details:

OUTDOOR UNIT Error Method:

Forecast of Cause :

5
5

Refer to error code table.

Outdoor Thermistor Error

OK

D

C

CN61

(OUT TEMP.)

THERMISTOR

1 2 3

1 2 3

B

LA

CK

BLA

C

K

Outdoor temperature thermistor

Outdoor temperature thermistor short or open detected

1. Connector connection defective, open

2. Thermistor failure

3. Main PCB failure

Check Point 1 : Check the connector connection and cable open

Connector connection state check

Cable open check

Check Point 2: Check the thermistor

Thermistor characteristics check (Disconnect the thermistor from the PCB and check.)
* For the thermistor characteristics, refer to the "Service Parts Information 8".

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

Main PCB (CN61:1-3) voltage value = 5V
Remove the thermistor from Main PCB, check the voltage.

Outdoor temperature thermistor (CN61:1-3)

If the voltage does not appear, replace Main PCB, and execute

the check operation aga

02-18

Trouble shooting 15

Indicate or Display:

Detective Actuators:

Detective details:

OUTDOOR UNIT Error Method:

Forecast of Cause :

Refer to error code table.

Heat Sink Thermistor Error

Inverter PCB

Heat sink temperature thermistor (Built-in IPM) open/short detected

1. Inverter PCB failure

02-19

Trouble shooting 16

Indicate or Display:

Detective Actuators:

Detective details:

OUTDOOR UNIT Error Method:

Forecast of Cause :

If this error is displayed, replace Inverter PCB

Trouble shooting 17
OUTDOOR UNIT Error Method:

Current Sensor Error

02-20

Indicate or Display:

Refer to error code table.

Detective Actuators:

Detective details:

Forecast of Cause :

Check Point 4 : Replace Main PCB

YES

NO

OK

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)

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

Refer to error code table.

Trouble shooting 18
OUTDOOR UNIT Error Method:

Indicate or Display:

OK

OK

Detective Actuators:

High pressure switch

Detective details:

Forecast of Cause :

1. High pressure switch connector disconnection, open

2. High pressure switch characteristics failure

3. Main PCB failure

When the power was turned on, "high pressure switch : open" was detected.

Check Point 1 : Check the high pressure switch connection state

Connector and wiring connection state check
Cable open check

Check Point 2 : Check the high pressure switch characteristics

Switch characteristics check
* For the characteristics of high pressure switch, refer to below.

Check Point 3 : Replace Main PCB

Change Main PCB, and execute the check operation again.

02-21

Pressure Sensor Error

Type of contact

Characteristics of pressure switch

C

H

Pressure

Pressure switch 1

4.2 0.1MPa

3.2 0.15MPa

Contact : Short Open

Contact : Open Short

(CN101)

02-22

Trouble shooting 19
INDOOR UNIT Error Method:

Indicate or Display:

Over Current Error

Refer to error code table.

Detective Actuators:

Detective details:

Forecast of Cause :

OKOK

OKOK

Check Point 3: Replace Main PCB

Outdoor unit Main PCB
Compressor
Transistor PCB

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

Check Point 2: Check Transistor PCB (IPM)

>> If IPM is abnormal, replace Transistor PCB.

OKOK

Check Point 4: Replace Compressor

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

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

2. Main PCB

3. Inverter compressor failure (lock, winding short)

4. Transistor PCB (IPM) failure

"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

Check IPM. (PARTS INFORMATION 7)

Trouble shooting 20
OUTDOOR UNIT Error Method:

Compressor Control Error

02-23

Detective Actuators:

Detective details:

Forecast of Cause :

Check Point 2 : Check connection of around the Compressor components

OKOK

Check Point 4: Replace Main PCB

Outdoor unit Main PCB
Compressor
Transistor PCB

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

4. Transistor PCB (IPM) failure

If Check Point 1,2 or 1 3 do not improve the symptom, change Main PCB.

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

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

(Refer to PARTS INFORMATION 2)

For Compressor Terminal, Main PCB

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

Check Point 1 : Check Noise from Compressor

Turn on Power and check operation noise.

If an abnormal noise show, replace Compressor.

OKOK

Check Point 5: Replace Compressor

If Check Point 4 do not improve the symptom, change Compressor.

OKOK

OKOK

Check Point 3: Check Transistor PCB (IPM)

>> If IPM is abnormal, replace Transistor PCB.

Check IPM. (PARTS INFORMATION 7)

Indicate or Display:

Refer to error code table.

02-24

Trouble shooting 21
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 1 Error

Outdoor unit Main PCB
Outdoor unit fan motor

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

4. Outdoor unit fan motor failure

Check Point 1 : Check rotation of Fan

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

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

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

Check Point 4 : Check Output Voltage of Main PCB

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

If the voltage is not correct, replace Main PCB.

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

Read wire DC voltage

Red - Black

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

White - Black

15 1.5V

CN800

1
2
3
4
5
6

BLACK
WHITE
YELLOW
BROWN

RED

FM

FAN MOTOR

Check Point 2 : Check ambient temp. around motor

OK

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

>>Upon the temperature coming down, restart operation.

Indicate or Display:

Refer to error code table.

02-25

Trouble shooting 22
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 2 Error

Outdoor unit Main PCB
Outdoor unit fan motor

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

4. Outdoor unit fan motor failure

Check Point 1 : Check rotation of Fan

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

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

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

Check Point 4 : Check Output Voltage of Main PCB

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

If the voltage is not correct, replace Main PCB.

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

Read wire DC voltage

Red - Black

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

White - Black

15 1.5V

CN802

1
2
3
4
5
6

BLACK
WHITE
YELLOW
BROWN

RED

FM

FAN MOTOR

Check Point 2 : Check ambient temp. around motor

OK

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

>>Upon the temperature coming down, restart operation.

Indicate or Display:

Refer to error code table.

Detective Actuators:

Detective details:

Forecast of Cause :

OKOK

OKOK

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

5. 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 3 : Check the solenoid coil and 4-way valve

02-26

[ Solenoid coil ]
Remove CN6 from PCB and check the resistance value of coil.
Resistance value is about 1.4k

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

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

OKOK

Check Point 4 : Replace Main PCB

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

Check Point 2 : Check thermistor of Indoor unit

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

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

Indoor Unit Controller PCB Circuit
Heat Exchanger Temperature Thermistor
Room Temperature Thermistor
4-way valve

When the indoor heat exchanger temperature is compared with
the room temperature, and either following condition is detected
continuously two times, the compressor stops.
Cooling or Dry operation
[Indoor heat exchanger temp.] - [Room temp.] > 20degC
Heating operation
[indoor heat exchanger temp.] - [Room temp.] < -14degC
If the same operation is repeated 5 times,
the compressor stops permanently.

Trouble shooting 23
OUTDOOR UNIT Error Method:

4-Way Valve Error

Indicate or Display:

Refer to error code table.

<Cooling operation>

OK

OK

OK

OK

OK

<Heating operation>

2. EEV defective, strainer clogged

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

4. Discharge temperature thermistor failure

5. Insufficient refrigerant

Discharge temperature thermistor

"Protection stop by "discharge temperature 110°C 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 "Service Parts Information 8".

Check Point 4 : Check the discharge thermistor

EEV open?

Strainer clogging check (before and after EEV, ACM
oil return)
Refer to "Service Parts Information 3, 4 "

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 7)

Check Point 2 : Check the EEV, strainer

Check Point 5 : Check the refrigerant amount

Leak check

EEV open?

Strainer clogging check (before and after EEV, ACM
oil return)
Refer to "Service Parts Information 3, 4"

Check Point 2 : Check the EEV, strainer

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

02-27

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

1. 3-way valve not opened

Detective Actuators:

Detective details:

Forecast of Cause :

Trouble shooting 24
OUTDOOR UNIT Error Method:

Discharge Temp. Error

Indicate or Display:

Refer to error code table.

Refer to error code table.

Compressor Temp. Error

OK

OK

OK

OK

1. 3-way valve not opened

2. EEV defective, strainer clogged

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

4. Compressor temperature thermistor failure

5. Insufficient refrigerant

Compressor temperature thermistor

Compressor temperature thermistor characteristics check
(Check by disconnecting thermistor from PCB)

* For the characteristics of the thermistor, refer to the "Service Parts Information 8.

Check Point 4 : Check the compressor temperature thermistor

Check Point 3 : Outdoor unit fan, heat exchanger check

Check for foreign object at heat exchanger

Check if fan can be rotated by hand.

Motor check(PARTS INFORMATION 7)

Check Point 5 : Check the refrigerant amount

Leak check

02-28

<Cooling operation>

OK

<Heating operation>

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

EEV open?

Strainer clogging check (before and after EEV, ACM
oil return)
Refer to "Service Parts Information 3, 4".

Check Point 2 : Check the EEV, strainer

EEV open?

Strainer clogging check (before and after EEV, ACM
oil return)
Refer to "Service Parts Information 3,4 ".

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

"Protection stop by "compressor tempreture" 108°C during compressor
operation""generated 2 times within 24 hours

Trouble shooting 25

Indicate or Display:

Detective Actuators:

Detective details:

OUTDOOR UNIT Error Method:

Forecast of Cause :

Refer to error code table.

Trouble shooting 26
OUTDOOR UNIT Error Method:

Low Pressure Error

Indicate or Display:

Detective Actuators:

Detective details:

Forecast of Cause :

OK

1. 3-way valve not opened 2. Outdoor unit ambient temperature too low

3. Outdoor unit fan operation defective, foreign matter at heat exchanger

4. EEV defective, strainer clogged 5. Solenoid valve defective

6. Low pressure sensor characteristics defective 7. Insufficient refrigerant

Suction pressure sensor

"Protection stop by suction pressure 0.02MPa continued for 5 minutes"
repeats 5 times within 2 hours.

No foreign oblect in air passage?

Heat exchange fins clogged

Fan rotates?

Outdoor unit fan motor check

Check Point 3 : Check the outdoor unit fan operation,

heat exchanger

Check Point 2 : Check the outdoor unit ambient temperature

Outdoor ambient temperature lower than operating range?

Outdoor unit EEV operation check

Strainer not clogged?

Check Point 4 : Check the outdoor unit EEV, strainer clogging

Indoor unit EEV operation check

Strainer not clogged?

Check Point 2 : Check the EEV, strainer clogging

Suction pressure sensor characteristics check

* For the characteristics of the suction pressure sensor
(PARTS INFORMATION 9)

Check Point 6 : Check the suction pressure sensor

Check Point 7 : Check the refrigerant amount

Leak check

Check Point 5 : Check the solenoid valve (SV1)

Solenoid valve operation check

02-29

<Cooling operation>

<Heating operation>

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

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

OK

OK

OK

OK

OK

Refer to "Sevice Parts Information 3"

Trouble shooting 27

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.

02-30

2-3 TROUBLE SHOOTING WITH NO ERROR CODE

Check Point 3 : Check Electrical Components

YESYES

OK

NO

Check the voltage of power supply.

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

Check Varistor in Filter PCB.

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

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

OK

Check Fuse in Filter PCB.

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

Trouble shooting 28

Forecast of Cause:

Check Point 3 : Check Electrical Components

OKOK

OKOK

YESYES

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

Check Fuse in Main PCB.

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

Check Active Filter Module and IPM. (PARTS INFORMATION 6 and 7)

>> If Active Filter Module or IPM is abnormal, replace it.

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

02-31

Trouble shooting 29

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

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.

02-32

Check Point 2 : Check Wired Remote Controller and Controller PCB

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

Check Voltage at CN14 (AU*G45/54LRLA, AR*G45LMLA, AB*G45LRTA), CN6 (AR*G45/54LHTA)
of Controller PCB. (terminal 1-3) (Power supply to Remote Control)

Attention

Trouble shooting 30

Forecast of Cause:

Check Point 2 : Check Outdoor Unit Operation

Check Point 1 : Check Indoor Unit

Check Point 3 : Check Site Condition

Check Point 5 : Check Refrigeration Cycle

Check Point 4 :
Check Indoor/ Outdoor Installation Condition

Pipe (In) Pipe (Out)

Pipe (In) Pipe (Out)

OKOK

OKOK

OKOK

OKOK

MPa MPa

No Cooling / No Heating

1. Indoor Unit error 2. Outdoor Unit error

3. Effect by Surrounding environment

4. Connection Pipe / Connection Wire failure 5. Refrigeration cycle failure

Does Indoor Unit FAN run on HIGH FAN?

Is Air Filter dirty?
Is Heat Exchanger clogged?

Check if Energy save function is operated.

Check if Outdoor Unit is operating

Check any objects that obstruct the air flow route.

Check clogged Heat Exchanger.

Is the Valve open?

Is capacity of Indoor Unit fitted to Room size?

Any windows open? Or direct sunlight ?

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

Check any loose or removed communication line.

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

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

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

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

Check EEV (PARTS INFORMATION 3)

Check Compressor (PARTS INFORMATION 1,2)

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

02-33

Trouble shooting 31

Forecast of Cause :

Trouble shooting 32

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?

02-34

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.

02-35

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

R(U)

S(V)

T(W)

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.

02-36

Resistance Value :

0.432 ± 8% at 20°C

R(U)

(RED)

S(V)

(WHITE)

T(W)

(BLACK)

IPM PCB

TM303TM304

TM305

RED

WHITE

BLACK

Compressor

Inverter PCB

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 4 : Check Voltage from Main PCB.

Check Point 3 : Check Noise at start up

Pipe (In)

Pipe (Out)

Pipe (In)

CLOSE
Example : Hot Gas

OPEN
Example : Hot Gas

Pipe (Out)

Pipe (In) Pipe (Out)

Pipe (In) Pipe (Out)

Check Point 6 : Check Strainer

DC

at 68°F(20°C)

Outdoor unit Electronic Expansion Valve
( EEV )

Check connection of connector
( 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.

02-37

CN111

EXPANSION
VALVE COIL

EV

RED

BLUE
ORANGE
YELLOW
WHITE

1
2
3
4
5
6

SERVICE PARTS INFORMATION 4

Indoor unit fan motor

02-38

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 Point 2 : Check resistance of indoor fan motor

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

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

Pin number
(wire color)

Terminal function
(symbol)

1 (Brown)

2 (Yellow)

3 (White)

4 (Black)

5

6 (Red)

Feed back (FG)

Speed command (Vsp)

Control voltage (Vcc)

Ground terminal (GND)

No function

DC voltage (Vm)

Check Point 1 : Check resistance of indoor fan motor

Check each winding resistance of the motor

>>If Resistance value is abnormal, replace motor.

Lead wire color

Resistance value
(20°C)

White - Red

Red - Black

Red - Violet

Violet - Blue

7.73 + 7%

7.08 + 7%

3.80 + 7%

3.80 + 7%

-

-

-

-

For AR *G45/ 54LHTA

For other indoor unit

(AC)

Thermal protector

Pr

Violet (Int.1)

Blue (Low)

Red (Hi)

Black

White

°C

SERVICE PARTS INFORMATION 5

Check Point 1 : Check rotation of Fan

Outdoor unit fan motor

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

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

Check Point 2 : Check resistance of Outdoor Fan Motor 1 or 2

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 (Black)

4 (White)

5 (Yellow)

6 (Brown)

DC voltage (Vm)

No function

Earth terminal (GND)

Control voltage (Vcc)

Speed command (Vsp)

Feed back (FG)

02-39

SERVICE PARTS INFORMATION 6

Active filter module

02-40

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

SERVICE PARTS INFORMATION 7

IPM
(Mounted on Transistor PCB)

02-41

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

SERVICE PARTS INFORMATION 8

Thermistor

02-42

Check Point : Check Thermistor resistance value

Remove connector and check Thermistor resistance value.

Temperature

[°C]

Resistance Value [ k ]

Thermistor A Thermistor B Thermistor C

- 30

- 20

- 10

- 5
0
5
10
15
20
25
30
40
50
60
70
80
90
100
110
120

1013.1

531.6

292.9

221.1

168.6

129.8

100.9

79.1

62.5

49.8

40.0

26.3

17.8

12.3

8.7

6.3

4.6

3.4

2.6

2.0

95.6

50.3

27.8

21.0

16.1

12.4

9.6

7.6

6.0

4.8

3.8

2.5

1.7

1.2

0.8

0.6

0.4

---

---

---

224.3

115.2

62.3

46.6

35.2

26.9

20.7

16.1

12.6

10.0

8.0

5.2

3.5

2.4

1.6

1.2

---

---

---

---

Applicable
Thermistors

Discharge temp. TH
Comprssor temp. TH

Outdoor temp. THHeat exchanger. TH

SERVICE PARTS INFORMATION 9

Suction Pressure Sensor

Check Point : Check Voltage from Main PCB

DC

With the connector connected to the PCB,
measure the voltage between CN91:3-4 of the Main PCB.

1. Suction Pressure Sensor

Characteristics of pressure sensor

3.5

1.7

0.5
0

Output [DCV]

Pressure [MPa]

DC

02-43

1
2
3
4

1
2
3
4

WHITE

PRESSURE
SENSOR
(LOW)

BLACK

RED

PS

CN91

0.85

2.0

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

May. 2013 Printed in Japan