SPLIT TYPE
ROOM AIR CONDITIONER
Cassette type
INVERTER
SERVICE
INSTRUCTION
Models Indoor unit
R410A
Outdoor unit
AUXG18LRLB
AUXG24LRLB
AO*G18LBCA
AO*G24LBCA
RCG18LRLB
RCG24LRLB
RCG18LRLB
RCG24LRLB
CONTENTS
1.
1. SPECIFICATIONS
DESCRIPTION OF EACH CONTROL OPERATION
1-1 COOLING OPERATION............................................................................................ 01-01
1-2 HEATING OPERATION............................................................................................. 01-02
1-3 DRY OPERATION...................................................................................................... 01-03
1-4
1-5
1-6
1-7
AUTO CHANGEOVER OPERATION........................................................................
INDOOR FAN CONTROL.........................................................................................
AIR FLOW DIRECTION CONTROL .........................................................................
OUTDOOR FAN CONTROL......................................................................................
01-04
01-06
01-09
01-10
1-8 COMPRESSOR CONTROL...................................................................................... 01-11
1-9 TIMER OPERATION CONTROL............................................................................... 01-12
1-10 ELECTRONIC EXPANSION VALVE CONTROL
...................................................... 01-16
1-11 TEST OPERATION CONTROL............................................................................... 01-16
1-12 PREVENT TO START FOR 3 MINUTES (3 MINUTES ST).................................... 01-16
1-13 4-WAY VALVE EXTENSION SELECT.................................................................... 01-16
1-14 AUTO RESTART..................................................................................................... 01-17
1-15 PUMP DOWN.......................................................................................................... 01-17
1-16 COMPRESSOR PREHEATING............................................................................... 01-18
1-17 10°C HEAT OPERATION
........................................................................................... 01-18
1-18 ECONOMY OPERATION........................................................................................ 01-18
1-19
1-20
1-21
1-22
DEFROST OPERATION CONTROL.......................................................................
OFF DEFROST OPERATION CONTROL...............................................................
VARIOUS PROTECTIONS......................................................................................
DRAIN PUMP OPERATION ...................................................................................
01-19
01-21
01-22
01-24
1-23 HUMAN SENSOR(OPTION) ................................................................................... 01-25
2. TROUBLE SHOOTING
2-1 ERROR DISPLAY...................................................................................................... 02-01
2-2 TROUBLE SHOOTING WITH ERROR CODE.......................................................... 02-02
2-3 TROUBLE SHOOTING WITH NO ERROR CODE.................................................... 02-43
2-4 SERVICE PARTS INFORMATION ............................................................................ 02-49
R410A
Cassette type
INVERTER
1 . DESCRIPTION OF EACH
CONTROL OPERATION
1-1. COOLING OPERATION
1-1-1 COOLING CAPACITY CONTROL
A sensor (room temperature thermistor) built in the indoor unit will usually perceive
difference or variation between a set temperature and present room temperature, and
controls the operation frequency of the compressor.
* If the room temperature is 6.0°C higher than a set temperature,
the compressor operation frequency will attain to maximum performance.
* If the room temperature is 1.0 °C lower than a set temperature, the compressor
will be stopped.
* When the room temperature is between +6.0°C to -1.0°C of the setting temperature,
the compressor frequency is controlled within the range shown in Table1.
However, the maximum frequency is limited in the range shown in Fig.1 based on the
fan speed mode and the outdoor temperature.
( Table 1 : Compressor Frequency Range )
minimum
frequency
10rps
maximum
frequency
120rps
( Fig. 1 : Limit of Maximum Frequency based on Outdoor Temperature )
When the room
temperature rises
Outdoor air
temperature
A zone
34°C
30°C
19°C
10°C
0°C
B zone
C zone
D zone
E zone
Fan speed mode
36°C
Model 18
32°C
21°C
12°C
2°C
F zone
When the room
temperature drops
01-01
Model 24
A zone
B zone
C zone
D-F zone
A zone
B zone
C zone
D-F zone
Hi
97rps
97rps
72rps
53rps
107rps
107ps
80rps
62rps
Me
Lo
Qu
53rps
53rps
49rps
37rps
62rps
62rps
56rps
47rps
46rps
46rps
40rps
34rps
51rps
51rps
47rps
40rps
34rps
34rps
34rps
22rps
40rps
40rps
40rps
25rps
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 6.0°C than a set temperature,
the compressor operation frequency will attain to maximum performance.
* If the room temperature is higher 1.0°C than a set temperature, the compressor
will be stopped.
* When the room temperature is between +1.0°C to -6.0°C of the setting temperature,
the compressor frequency is controlled within the range shown in Table2.
( Table 2 : Compressor Frequency Range )
minimum
frequency
maximum
frequency
12rps
120rps
01-02
1-3. DRY OPERATION
1-3-1 INDOOR UNIT CONTROL
The compressor rotation frequency shall change according to set temperature and room
temperature variation which the room temperature sensor of the indoor unit has detected
as shown in the Table 3.
( Table 3 : Compressor frequency )
Operating frequency
X zone
34rps
J zone
Y zone
0rps
( Fig.2 : Compressor Control based on Room Temperature )
Room
temperature
Ts+0.5°C
Ts-1.5°C
Room
temperature
Ts+1.5°C
X zone
Ts-0.5°C
J zone
Ts : Setting temperature
Y zone
( Fig.3 : Indoor Fan Control )
Compressor
ON
OFF
Setting air flow
Lo
S-Lo
OFF
10
30
60
360
01-03
120
360
120
10
30
(sec)
1-4. AUTO CHANGEOVER OPERATION
When the air conditioner is set to the Auto mode by remote controller, operation starts in the optimum
mode from among the Heating, Cooling, 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 0.5°C (wireless and 2WIRE remote controller)
Or 1.0°C (3WIRE remote controller) steps.
1 When operation starts, indoor fan and outdoor fan are operated for around 1 minutes.
Room temperature and outdoor temperature are sensed, and the operation mode is selected
in accordance with the table below. <Monitoring mode>
( Table 4 : Operation mode selection table )
Room temperature (TR)
Operation mode
Cooling
TR> Ts+2°C
Ts+2°C
TR
TR : Room temperature
Ts : Setting temperature
*Middle zone
Ts -2°C
TR < Ts -2°C
Heating
*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 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 and Heating mode, indoor unit will be operated
according to the outdoor temperature as below.
( Fig.4 : Outdoor temperature zone selection )
Temperature
Mode
25°C and over
Cooling
25°C under
Heating
2 When the compressor was stopped for 6 consecutive minutes by the temperature control function
after the Cooling or Heating mode was selected at 1 above, operation is switched
to Monitoring and the operation mode is selected again.
3 When the middle zone is selected on the predetermining of the operation mode, the operation mode
before the changing to the monitor mode is selected.
01-04
AUTO CHANGEOVER operation flow chart
START
TS : Setting temperature
Monitor mode
Room temp.
Ts+2°C?
YES
NO
Room temp.
Ts -2°C?
NO
Middle zone
Auto change over is
second or more?
YES
NO
NO
Operation mode
before the monitor mode is
cooling mode?
YES
Operation mode of
outdoor unit : Cooling?
HEATING OPERATION
YES
COOLING OPERATION
NO
YES
Thermostat remains
in OFF state for 6 minutes or
longer?
YES
NO
YES
System stops
or operation command other than
auto changeover operation?
Operation mode of outdoor unit
: Heating?
NO
YES
Outdoor temperature<
25°C?
NO
NO
01-05
Thermostat remains
in OFF state for 6 minutes or
longer?
YES
NO
System stops
or operation command other than
auto changeover operation?
NO
YES
1-5. INDOOR FAN CONTROL
1. Fan speed
( Table 5 : Standard of Indoor Fan Speed )
*The following fan speed is a standard value.
Operation
mode
Air flow
mode
Heating
Speed (rpm)
Model 18
Model 24
HIGH
400
430
MED+
380
410
MED
360
400
LOW
340
360
Quiet
300
330
Cool air prevention
300
300
HIGH
400
430
MED
360
400
LOW
340
360
Quiet
300
330
Soft Quiet
300
300
S-Lo
270
270
Dry
300
330
Cooling
/ FAN
FAN
2. FAN OPERATION
The airflow can be switched in 5 steps such as AUTO, QUIET, LOW, MED, HIGH, while the indoor
fan only runs.
3. COOLING OPERATION
Switch the airflow [AUTO], and the indoor fan motor will run according to a room temperature,
as shown in Fig.5.
On the other hand, if switched in [HIGH] ~ [LOW], the indoor motor will run at a constant airflow of [COOL]
operation modes LOW, MED, HIGH,as shown in Table 5.
( Fig.5 : Airflow change - over ( Cooling : AUTO ) )
*1 When the room
temperature rises
TR-Ts =
> 2°C
2°C > TR-Ts >
= 1°C
1°C > TR-Ts
TR-Ts =
> 2.5°C
HIGH mode
2.5°C > TR-Ts =
> 1.5°C
MED mode
1.5°C > TR-Ts
LOW mode
When the room
temperature drops
TR : Room temperature
Ts : Setting temperature
*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.
01-06
4. HEATING 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 [HEAT] operation modes Lo, Me, Hi, as shown in Table5.
( Fig.6 : Airflow change - over ( Heating : AUTO ) )
Indoor heat exchanger
temperature
TR-Ts =
> -1.0°C
Lo mode
1.0°C > TR-Ts =
> -2.0°C
Me mode
-2.0°C > TR-Ts
TR-Ts >
= -1.5°C
-1.5°C > TR-Ts =
> -2.5°C
Hi mode
-2.5°C > TR-Ts
5. COOL AIR PREVENTION CONTROL (Heating mode)
The maximum value of the indoor fan speed is set as shown in Fig.7, 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.7 : Cool Air Prevention Control )
Indoor heat exchanger
temperature rises
42°C
39°C
37°C
30°C
Hi
42°C
*Me+
or setting fan mode
37°C
*Lo
or setting fan mode
34°C
Cool air
prevention
32°C
S-Lo
Indoor heat exchanger
temperature rises
Indoor heat exchanger
temperature drops
39°C
13 min. later
37°C
30°C
24°C
*Lower speed is selected.
Hi
Indoor heat exchanger
temperature drops
*Me+
or setting fan mode
37°C
*Lo
or setting fan mode
34°C
*Lo
or setting fan mode
32°C
*Lo
or setting fan mode
24°C
*Lower speed is selected.
6. DRY OPERATION
Refer to the table 5.
During the dry mode operation, the fan speed setting can not be changed.
01-07
7. FAN CONTROL FOR ENERGY SAVING
When the air flow setting except AUTO mode, the indoor fan motor will run as shown in Fig.8.
( Fig 8 : Indoor Fan Control)
Compressor
ON
OFF
Indoor fan
Setting air flow
480rpm
S-Lo
OFF
10
30
60
(
Setting Description
Function Number
Disable
Enable
180
60
180
60
10
Factory setting)
Setting Value
00
49
01
02
Remote controller
00 : When the outdoor unit is stopped, the indoor unit fan operates continuously following
the setting on the remote controller.
01 : When the outdoor unit is stopped, the indoor unit fan operates intermittently at a very
low speed.
02 : Enable or disable this function by remote controller setting.
Set to “00”or “01”when connecting a remote controller that cannot set
the Fan control for energy saving function or connecting a network converter.
To confirm if the remote controller has this setting,
refer to the operating manual of each remote controller.
01-08
30
(sec)
1-6. AIR FLOW DIRECTION CONTROL
Individual control
To independently can be set the airflow pattern of each louver as this image.
(Fig.10 : Independent louver control image)
This function is given priority to overall louver control.
But this function is release during the following operation.
Cold air prevention control
Monitor mode on the auto change over operation
Defrost operation
The air direction range will change as follows:
(Fig.11 : Air Direction Range)
Use the wired remote controller to set this function.
This function is only available by 2 wire remote controller.
*When the 2 wire remote controller is disconnected, clear the individual setting.
Otherwise, this setting can’t change.
All louver control
All louver operation
Cooling mode standard position: 2
Dry mode standard position: 2
When the mode is selected, the standard
louver position of the each mode is set.
Heating standard position : 4
Monitor mode position: 2
*Setting of the wireless remote controller is not displayed on the wired remote controller.
*The setting louver of the individual control function cannot be controlled.
01-09
1-7. OUTDOOR FAN CONTROL
1. Outdoor Fan Motor
Following table shows the fan speed of the outdoor unit.
( Table 6 : Fan speed of the outdoor unit )
Cooling
Heating
Dry
Low ambient cooling / Dry
Normal
Normal
Normal
F zone
G zone
H zone
S-Hi2
-
1100
-
-
-
-
S-Hi1
1100
1100
-
-
-
-
Hi3
1100
1050
-
-
-
-
Hi2
1100
1050
-
-
-
-
Hi1
870
780
Me2
870
720
530
-
430
-
350
-
250
-
Me1
Lo2
720
590
370
300
250
500
590
530
-
-
-
-
Lo1
500
480
530
300
260
200
Ambient Temperature zone
21°C
12°C
2°C
-8°C
D zone(Normal 1)
D zone(Normal 2)
19°C
F zone
10°C
G zone
0°C
H zone
-10°C
Zone control (rps:Compressor frequency)
1) Cool / Heat (Normal)
72rps
2) Dry (Nomal)
Hi2
43rps
Hi1
68rps
37rps
Me2
40rps
27rps
Me1
35rps
15rps
Lo2
19rps and over
[ Hi 1 ]
16rps and over
[ Me 1 ]
16rps under
[ Lo 1 ]
24rps
15rps
Lo1
3) Cool / Dry / F zone
4) Cool / Dry / G zone
5) Cool / Dry / H zone
51rps and over
[ Hi 1 ]
51rps and over
[ Hi 1 ]
43rps and over
[ Hi 1 ]
43rps and over
[ Me 1 ]
43rps and over
[ Me 1 ]
34rps and over
[ Me 1 ]
43rps under
[ Lo 1 ]
43rps under
[ Lo 1 ]
34rps under
[ Lo 1 ]
01-10
1-8. COMPRESSOR CONTROL
1. OPERATION FREQUENCY RANGE
The operation frequency of the compressor is different based on the operation mode as
shown in Table 7.
(Table 7 : Compressor Operation Frequency Range)
Cooling / Dry
Min
Max
10rps
120rps
Heating
Min
Max
12rps 120rps
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)
Normal start-up
Frequency
Frequency
Frequency
Frequency
Frequency
Time 1
Time 2
Time 4
Time 3
Time 5
(Frequency)
Frequency
35rps
Frequency
Frequency
Frequency
Frequency
53rps
66rps
82rps
106rps
Time 2
Time 3
Time 4
Time 5
(Time)
Time 1
80sec
160sec
300sec
440sec
01-11
500sec
1-9. TIMER OPERATION CONTROL
1-9-1 Wired Remote Controller
UTY-RNR*Z1(2 wire remote controller)
ON / TIMER
OFF / TIMER
WEEKLY TIMER
*3 wire remote controller can be connected
If 3 wire remote controller is connected, set the DIP-SW on the controller PCB
Refer to the installation manual for detailed.
If used in combination with wireless and wired remote controller, the following function is limited.
Sleep timer
Timer
10°C heat operation
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. WEEKLY TIMER
2-1. WEEKLY TIMER
Use this timer function to set operating time for each day of the week.
The weekly timer allows up to two ON and OFF time to set up per day.
Operation mode
Operation mode
Operation mode
Stop mode
Stop mode
Set time
Set time
Set time
Stop mode
Set time
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.
01-12
2-2. DAY OFF setting
The DAY OFF setting is only available for days for which weekly settings already exist.
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.
Normal
DAY OFF
Operation mode
Operation mode
Stop mode
Stop mode
Stop mode
Preceding day
Setting day
Next day setting
Next day
DAY OFF
Operation mode
Operation mode
Stop mode
Stop mode
Preceding day
Setting day
Stop mode
Next day
The DAY OFF setting can only be set one time. The DAY OFF setting is cancelled automatically
after the set day has passed.
01-13
1-9-2 Wireless Remote Controller (OPTION)
AR-REJ1E
ON / TIMER
OFF / TIMER
PROGRAM TIMER
SLEEP TIMER
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
The program timer allows the OFF timer and ON timer to be used in combination one time.
Operation mode
Operation mode
Stop mode
Stop mode
Stop mode
Set time
Operation mode
Set time
Set time
Set time
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.
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.
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.
Set temperature rises
( Ts : Set temperature )
Stop of operation
+2°C
+1°C
Ts
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 temperature lowers
( Ts : Set temperature )
Ts
-1°C
-2°C
-3°C
-4°C
Stop of operation
Set
30min
01-15
60min 90min
1-10. ELECTRONIC EXPANSION VALVE CONTROL
The most proper opening of the electronic expansion valve is calculated and controlled under the
present operating condition based on the following values.
The compressor frequency, the temperatures detected by the discharge temperature sensor
and the outdoor temperature sensor.
The pulse range of the electronic expansion valve control is 52 ~ 480 pulses (Cooling) and 52 ~ 480
pulses (Heating).
At the time of supplying the power to the outdoor unit, the initialization of the electronic
expansion valve is operated (528 pulses are input to the closing direction).
1-11. TEST OPERATION CONTROL
With Wired Remote Controller
Touch the [Test run] in the “Maintenance” screen.
(Installer password* is required.)
The “Test Run” screen is displayed.
Touch [OK] to return to the Maintenance screen, and start the test run.
The test run will automatically end is approximately 60 min.
If you wish to cancel the test run before it is complete, return to the “Monitor Mode screen”, and touch
the On/Off button.
*If the password has been changed from the default setting “0000”,
please contact the installer.
With Wireless Remote Controller
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.
1-12. PREVENT TO RESTART FOR 3 MINUTES ( 3 MINUTES ST )
The compressor won't enter operation status for 3 minutes after the compressor is stopped,
even if any operation is given.
1-13. 4-WAY VALVE EXTENSION SELECT
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.
01-16
1-14. AUTO RESTART
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
Energy saving setting
Each central setting
1-15. PUMP DOWN
01-17
1-16. COMPRESSOR PREHEATING
When the outdoor temperature is lower than 0°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 25°C or greater,
preheating is ended.
1-17. 10°C HEAT OPERATION
The 10°C HEAT operation functions by pressing 10°C.HEAT button on the remote controller.
The 10°C HEAT operation can be set by the wireless remote controller.
The 10°C HEAT operation is almost the same operation as below settings.
( Table9 )
Mode
Heating
Setting temperature
10°C
Fan mode
AUTO
1-18. 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.
( Table10)
Mode
Target temperature
Cooling/ Dry
Heating
Setting temp.+1°C
Setting temp.-1°C
01-18
1-19. DEFROST OPERATION CONTROL
1. CONDITION OF STARTING THE DEFROST OPERATION
The defrost operation starts when the outdoor heat exchanger temperature sensor (Tn) detects
the temperature lower than the values shown in Table11.
( Table 11 : Condition of starting Defrost Operation )
1 ST time defrosting
after starting operation
Compressor integrating operation time
Less than 22 min.
22 to 62 min.
Does not operate
Defrosting after 2 ND time
upon starting operation
More than 62 min.
- 9°C
- 5°C
Compressor integrating operation time
Less than 35 min.
Does not operate
More than 35min.
Tn-Tn10 < - 5deg
Tn-Tnb < - 2deg
However, Tn <
= - 6°C
Tn10 : Temperature of continuous operation at 10minutes.
Tnb : Back 5minutes temperature
Compressor integrating operation time
Integrating defrost
(Constant monitoring) More than 240 min.
Less than 10min.*1
(For long continuous operation)
- 3°C
(For intermittent operation)
OFF count of the compressor
40 times.
*1 : 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 become as shown in Table12.
( Table12 : Defrost Release Condition )
Release Condition
Outdoor heat exchanger temperature sensor value is higher than
+13°C or Compressor operation time has passed 15 minutes.
01-19
3. Defrost Flow Chart
The defrosting shall proceed by the integrating operation time, outdoor temperature
and outdoor heat exchanger temperature as follows.
Heating operation start : Compressor ON
(Not defrosted for 10 minutes)
1st defrost
2nd and later defrost
Compressor
integrating
operation:
Over 22 min.
Compressor
integrating
operation:
Over 62 min.
Outdoor
heat exchanger
temperature:
Below - 9°C
Outdoor
heat exchanger
temperature:
Below - 5°C
Compressor
integrating
operation:
Over 35 min.
Integrating defrost
(Constant monitoring)
Compressor
OFF count :
40 times
(Less than 10min.)
Compressor
integrating
operation:
Over 240 min.
Outdoor
heat exchanger
temperature:
Below - 3°C
Tn-Tn10 < - 5deg
Tn-Tnb < - 2deg
However, Tn <= 6°C
Defrost start
Defrost Indicator:
[Operation lamp]
6 sec ON / 2 sec OFF
Compressor OFF
Outdoor fan motor OFF
30 sec later four - way valve OFF
35 sec later compressor ON
Outdoor heat exchanger temperature:
Over +13°C
or
Compressor ON time: Maximum 15 minutes
Defrost end
01-20
1-20. OFF DEFROST OPEARTION CONTROL
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 (6 sec ON / 2 sec OFF), the outdoor unit will allow the heat exchanger to defrost,
and then stop.
1. OFF DEFROST OPERATION CONDITION
In heating operation, the outdoor heat exchanger temperature is less than -4°C,
compressor continuous operation more than 10 minutes, and
compressor operation integrating time lasts for more than 30 minutes.
2. OFF DEFROST END CONDITION
Release Condition
Outdoor heat exchanger temperature sensor value is higher than +13°C
or Compressor operation time has passed 15 minutes.
OFF Defrost Flow Chart
Heating operation stop
Outdoor heat exchanger temperature :
Below -4°C
Compressor continuous operation :
Over 10 minutes
Compressor integrating operation :
Over 30 minutes
Defrost start
Defrost Indicater:
[Operation lamp]
6 sec ON / 2 sec OFF
Outdoor heat exchanger temperature :
Over +13°C
or
Compressor ON time : Maximum 15 minutes
Defrost end
01-21
1-21. VARIOUS PROTECTIONS
1. DISCHARGE GAS TEMPERATURE OVERRISE PREVENTION CONTROL
The discharge gas thermosensor (discharge thermistor : Outdoor side) will detect discharge gas
temperature.
When the discharge temperature becomes higher than Temperature ,the compressor frequency
is decreased 20rps, and it continues to decrease the frequency for 20rps every 120 seconds until
the temperature becomes lower than Temperature .
When the discharge temperature becomes lower than Temperature , the control of
the compressor frequency is released.
When the discharge temperature becomes higher than Temperature
and the indoor unit LED starts blinking.
,the compressor is stopped
(Table14 : Discharge Temperature Over Rise Prevention Control / Release Temperature)
Temperature
Temperature
104°C
101°C
Temperature
110°C
2. CURRENT RELEASE CONTROL
The compressor frequency is controlled so that the outdoor unit input current does not exceeds
the current limit value that was set up with the outdoor temperature.
The compressor frequency returns to the designated frequency of the indoor unit at the time
when the frequency becomes lower than the release value.
( Table 15 : Current release operation value / release value )
Model 18
[ Heating ]
OT (Control / Release)
17°C
12°C
5 °C
7.0A / 6.5A
9.0A / 8.5A
10.5A / 10.0A
12.0A / 11.5A
OT : Outdoor Temperature
Model 24
[ Heating ]
OT (Control / Release)
17°C
12°C
5 °C
10.5A / 10.0A
13.0A / 12.5A
15.0A / 14.5A
17.0A / 16.5A
OT : Outdoor Temperature
[ Cooling ]
OT (Control / Release)
50°C
46°C
40°C
4.5A / 4.0A
4.5A / 4.0A
6.0A / 5.5A
8.5A / 8.0A
OT : Outdoor Temperature
[ Cooling ]
OT (Control / Release)
50°C
46°C
40°C
7.0A / 6.5A
7.0A / 6.5A
9.5A / 9.0A
12.0A / 11.5A
OT : Outdoor Temperature
01-22
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 16 : 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
Temperature
Temperature
7°C
4°C
13°C
*1. When the temperature rises.
*2. When the temperature drops.
4. COOLING PRESSURE OVERRISE PROTECTION
When the outdoor unit heat exchange sensor temperature rises to 67°C or greater,
the compressor is stopped and trouble display is performed.
01-23
1-22. DRAIN PUMP OPERATION
. During Cooling / Dry mode
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 as show in Fig15.
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:
1 The compressor, indoor and outdoor fan motor operation are stopped.
2 Drain pump operates continuously for 3 minutes after the float switch is turned off.
(Almost condensing water may be drained)
3 The indoor unit fan motor operates after the float switch is turned off.
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.
(Fig 15 : Detail of Drain Pump Operation)
3 minutes
ON
3 minutes
3 minutes
3 minutes
Drain Pump
OFF
10 minutes
Start
(0 minutes)
60 minutes
180 minutes
<Float Switch turns OFF less than 3 minutes>
Less than 3 minutes
Float Switch
Compressor
ON
OFF
ON
OFF
3 minutes ST
Indoor Fan
Drain Pump
. During Heating
ON
OFF
ON
OFF
3 minutes
/ Fan mode / Stop operation
1.When the water level in the drain pan rises up and then the float switch functions:
1 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. )
Float Switch
Drain Pump
ON
OFF
ON
OFF
3 minutes
01-24
1-23. HUMAN SENSOR (OPTION)
Auto saving operation
If no one enters the room during the set time (15, 30, 60, 90, 120, 180 minutes), the set
temperature will be automatically controlled.
(When someone comes back into the room, the human sensor will detect this, and automatically
revert to the original settings).
(Table 12)
Operation mode
Cool / Dry
Heat
Operation details
(if there is no one in the room for a while)
The set temperature will be increased by
a maximum of approximately 2°C.
The set temperature will be decreased by
a maximum of approximately 2°C.
* High limit : 30°C
* Low limit : 16°C
Auto off operation
If no one enters the room during the set time (1 to 24 hours in 1 hour increments), the air
conditioner will automatically stop operation.
Example of sensitivity range
Ceiling height :
3.2m
Equal sensitivity
range of temperature Detecting position :
0.8m from floor surface
01-25
R410A
Cassette type
INVERTER
2 . TROUBLE SHOOTING
2 ERROR DISPLAY
2-1 INDOOR UNIT AND WIRED REMOTE CONTROLLER DISPLAY
Check the Error LED display on the Indoor unit (IR Receiver *Option )
1. Check ECONOMY (Green) LED Blinking, it means the Error on the system. (Not brinking: No Error)
2. Count OPERATION (Green) LED blinks: The number of blinking means the first digit of Error code.
3. Count TIMER (Orange) LED blinks: The number of blinking means the second digit of Error code.
Example) ECONOMY: Blinking continuous / OPERATION: 4 times / TIMER: 1 time
Indoor Room Thermistor Error
Check the Error code on the wired remote controller (Remote controller *Option)
1. If an error occurs, an error icon appears on the “Monitor mode screen”.
Touch the [Status] on the “Monitor mode screen”.The “Status” screen is displayed.
2. Touch the [Error Information] on the “Status”screen. The “Error Information”screen is displayed.
(If there are no errors, the [Error Information] will not be displayed.)
3. 2-digit numbers correspond to the error code in the table below. Touch the [Next page]
(or [Previous page]) to switch to other connected indoor units. Example) 2WIRE remote controller
1.
Mode
!
Set Temp.
Status
2.
Fri 10:00AM
Fan
Page 1/ 4
Status
Air Flow Direction
VT
[
1
Individual
[
Economy
[
Off
]
]
Error Information
Page 1/ 5
Address
[ 02 01
Error Code
[ 14 . 15, 41 . 44
]
]
]
Next
Page
Monitor
Menu
3.
Error
Code
Trouble
shooting
Serial Communication Error
11
1,2
Wired Remote Controller
Communication Error
12
External communication Error
Error
Information
Back
Next
Page
Error
Code
Trouble
shooting
PFC circuit Error
64
18
3
Trip terminal L Error
65
19
18
4
Discharge Thermistor Error
71
20
Combination error
23
5
Compressor Thermistor Error
72
21
Indoor unit address setting Error
26
6
Heat Ex. Liquid Outlet
Thermistor Error
73
22
Connection unit number error
(Indoor unit Wired remote controller Error)
29
7
Outdoor Thermistor Error
74
23
Indoor unit PCB model
information Error
32
8
Heat Sink Thermistor Error
77
24
Manual Auto SW error
35
9
Current sensor Error
84
25
Indoor unit Communication circuit
(wired remote controller) Error
3A
10
Pressure sensor Error
86
26
Indoor Room Thermistor Error
41
11
Trip detection
94
27
Indoor Heat Ex. Thermistor Error
42
12
Compressor rotor position
detection Error
95
28
Human Sensor Error
44
13
Outdoor Unit Fan Motor Error
97
29
Indoor Unit Fan Motor Error
51
14
4-way Valve Error
99
30
Drain pump Error
53
15
Discharge Temp. Error
A1
31
Outdoor unit main PCB model
information Error
62
16
Compressor Temp. Error
A3
32
Inverter Error
63
17
Error Contents
02-01
Error Contents
2-2 TROUBLE SHOOTING WITH ERROR CODE
Trouble shooting 1
OUTDOOR UNIT Error Method:
Serial communication error
(Serial Reverse Transfer Error)
Indicate or Display:
Outdoor unit : No indication
Error code : 11
Detective details:
Detective Actuators:
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.
Outdoor unit Main PCB
Outdoor unit fan motor
Forecast of Cause:
1. Connection failure
2. External cause
Check Point 1-1 : Reset the power and operate
Does Error indication show again?
3. Main PCB failure
4. Outdoor unit fan motor failure
NO
YES
Check Point 1-2: Check external cause such as noise
Check Point 2 : Check Connection
Check any loose or removed connection line of
Indoor unit and Outdoor unit.
>> If there is an abnormal condition, correct it by
referring to Installation Manual or Data &
Technical Manual.
Check the complete insulation of the grounding.
Check if there is any equipment that causes harmonic wave
near the power cable (Neon light bulb or any electronic
equipment which causes harmonic wave).
OK
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.
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 L - 3.
>> If it is abnormal, Check Outdoor unit fan motor (PARTS INFORMATION 5)
>> If Outdoor fan motor is abnormal, replace Outdoor unit fan motor and Main PCB.
>> If Outdoor fan motor is normal, replace Main PCB.
RED
3
BLACK
L
WHITE
N
+
-
02-02
Trouble shooting 2
INDOOR UNIT Error Method:
Serial Communication Error
(Serial Forward Transfer Error)
Indicate or Display:
Detective Actuators:
Detective details:
Error code : 11
Outdoor unit : No indication
When the outdoor unit cannot properly receive the serial signal from
indoor unit for 10 seconds or more.
Indoor unit Controller PCB
Forecast of Cause:
1. Connection failure
2. External cause
3. Controller PCB failure
Check Point 1-1 : Reset the power and operate
NO
Does error indication reappear?
YES
Check Point 2 : Check connection
Check Point 1-2 : Check external cause such as noise
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 if the ground connection is proper.
Check if there is any equipment that causes harmonic wave
near the power cable (Neon light bulb or any electronic
equipment which causes harmonic wave).
OK
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.
OK
Check Point 4 : Check serial signal (Forward transfer signal)
Check serial signal (Forward transfer signal)
>> Check if indicated value swings berween AC30v and AC130V at outdoor unit terminal 2 - 3.
>> If it is abnormal, replace Controller PCB.
BLACK
1
WHITE
2
RED
3
BLACK
L
WHITE
N
+
-
02-03
Trouble shooting 3
Indicate or Display:
INDOOR UNIT Error Method:
Wired Remote Controller
Communication Error
Error code : 12
Detective Actuators:
Detective details:
Indoor unit Controller PCB
Wired Remote Controller
Outdoor unit : No indication
When the indoor unit cannot properly receive the signal from
Wired Remote Controller for 1 minute or more.
Forecast of Cause:
1. Connection failure
2. Wired Remote Controller failure
3. Controller PCB failure
Check Point 1 : Check the connection of terminal
After turning off the power,
Check & correct the followings.
Check the connection of terminal berween Wired Remote Controller and indoor unit,
and check if there is a disconnection of the cable.
OK
Check Point 1-2 : Check Wired Remote Controller and Controller PCB
Ceck Voltage at CN14 of Controller PCB. (Terminal 1-3, Terminal 1-2)
(Power supply for the Remote Control)
>> If it is DC13V, Remote Control is failure. (Controller PCB is normal)
>> Replace Remote Control
>> If it is DC 0V, Controller PCB is failure. (Check Remote Control once again) >> Replace Controller PCB
Check Point 2 : Wire installation Wrong RCgroup setting
Wrong wire connection in RCgroup (Please refer to the installation manual)
The number of connecting indoor unit and Remote controller in one RCgroup were less than 32 units.
Check Point 2-1 : Check Indoor unit controller PCB
Check if controller PCB damage
Change controller PCB and check the Error after setting remote controller address
02-04
Trouble shooting 4
INDOOR UNIT Error Method:
Indicate or Display:
External communication error
Error code : 18
Detective Actuators:
Detective details:
External communication error
Outdoor unit : No indication
After receiving a signal from the external I/O PCB,
the same a signal has not been received for 15sec
Forecast of Cause :
1. Connection failure
2.External I/O PCB failure
3.Controller PCB failure
Check Point 1 : Check the connection
Check any loose or removed connection of between the controller PCB to the external I/OPCB
>>If there is an abnormal condition, correct it by refer to installation manual or
the technical manual.
Check the condition condtion on the external I/O PCB and the controller PCB
(If there is loose connector, open cable or mis-wiring)
OK
Check Point 2: Replace external I/O PCB
If Check Point 1 do not improve the symptom, change External I/O PCB.
OK
Check Point 3: Replace Controller PCB
If Check Point 2 do not improve the symptom, change Controller PCB.
02-05
Trouble shooting 5
INDOOR UNIT Error Method:
Combination error
Detective Actuators:
Indoor unit
Indicate or Display:
Error code : 23
Outdoor unit : No indication
Detective details:
1. The outdoor unit receives the serial signal of applied refrigerant information
from Indoor unit. When the refrigerant is R410a.
2. When the outdoor unit type is multi.
Forecast of Cause:
1. The selection of indoor units is incorrect
Check Point 1 : Check the type of indoor unit
Check the type of the connected indoor unit.
>> If abnormal condition is found, correct it.
OK
Check Point 2 : Replace Main PCB
If Check Point 1 do not improve the symptom, replace Main PCB of Outdoor unit.
02-06
Trouble shooting 6
INDOOR UNIT Error Method:
Indoor unit address setting error
Detective Actuators:
Wired remote controller ( 2-Wire )
Indoor unit Controller PCB circuit
Indicate or Display:
Error code : 26
Outdoor unit : No indication
Detective details:
When the address number set by auto setting and manual setting are mixed in
one RC group.
When the duplicated address number exists in one RC group.
Forecast of Cause : 1. Wrong wiring of RCgroup 2. Wrong remote address setting 3. Indoor unit controller PCB failure
4. Remote controller failure
Check Point 1 : Wire installation
Wrong wire connection in RCgroup (Please refer to the installation manual)
Check Point 2 : Wrong RCgroup setting
The given address number by auto setting (00) and the manual set number (Except 00) were not existing in one RCG.
The remote controller address setting by U.I. were not existing same address.
The duplicated address number is not existing in one RCgroup
Check Point 3 : Check Indoor unit controller PCB
Check if controller PCB damage
Change controller PCB and check the Error after setting remote controller address
02-07
Trouble shooting 7
INDOOR UNIT Error Method:
Indicate or Display:
Connection unit number error (Indoor
unit in Wired remote controller system)
Error code : 29
Detective Actuators:
Detective details:
Wired remote controller ( 2-Wire )
Indoor unit Controller PCB circuit
Outdoor unit : No indication
When the number of connecting indoor units are out of specified rule.
Forecast of Cause : 1. Wrong wiring / Number of I.U, RC in RCgroup 2. Indoor unit controller PCB defective
Check Point 1 : Wire installation
Wrong number of connecting indoor unit
Check Point 2 : Check Indoor unit controller PCB
Check if controller PCB damage
Check if controller PCB and check the Error after setting remote controller address
02-08
Trouble shooting 8
INDOOR UNIT Error Method:
Indicate or Display:
Indoor unit PCB model
information error
Error code : 32
Outdoor unit : No indication
Detective details:
Detective Actuators:
Indoor unit Controller PCB
When power is on and there is some below case.
1. When model information of EEPROM is incorrect.
2. When the access to EEPROM failed.
Forecast of Cause:
1. External cause
2. Defective connection of electric components
Check Point 1-1 : Reset Power Supply and operate
3. Controller PCB failure
NO
Does Error indication show again?
YES
Check Point 1-2 :
Check external cause such as noise
Check Point 2 :
Check Indoor unit electric components
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 all connectors.
(loose connector or incorrect wiring)
Check any shortage or corrosion on PCB.
Check Point 3 : Replace Controller PCB
Change Controller PCB.
Note : EEPROM
EEPROM(Electronically Erasable and
Programmable Read Only Memory) is a nonvolatile memory which keeps memorized
information even if power is turned off. It can
change the contents electronically.
To change the contents, it uses higher
voltage than normal, and it can not change a
partial contents. (Rewriting shall be done
upon erasing the all contents.)
There is a limit in a number of rewriting.
02-09
Trouble shooting 9
INDOOR UNIT Error Method:
Indicate or Display:
Manual Auto Switch Error
ERROR CODE : 35
Detective Actuators:
Detective details:
Indoor Unit Controller PCB
Indicator PCB
Manual Auto Switch
Outdoor unit : No indication
When the Manual Auto Switch becomes ON for consecutive 30 or
more seconds.
Forecast of Cause :
1. Manual Auto Switch failure
2. Controller PCB and Indicator PCB failure
Check Point 1 : Check the Manual Auto Switch
Check if Manual Auto Switch is kept pressed.
Check ON/OFF switching operation by using a meter.
>> If Manual Auto Switch is disabled (on/off switching), replace it.
OK
Check Point 2 : Replace Controller PCB and Indicator PCB
If Check Point 1 do not improve the symptom, replace Controller PCB and Indicator PCB
and execute the check operation again.
02-10
Trouble shooting 10
INDOOR UNIT Error Method:
Indicate or Display:
Indoor unit Communication circuit
(wired remote controller) error
Error code : 3A
Detective Actuators:
Indoor unit Controller PCB circuit
Outdoor unit : No indication
Detective details:
Detect the communication error of microcomputer and communication PCB.
Forecast of Cause : 1.Communication PCB defective
2. Indoor unit controller PCB defective
Check Point 1 : Check the connection of terminal
After turning off the power supply, check & correct the followings
Indoor unit - Check the connection the communication PCB and the controller PCB
OK
Check Point 2 : Replace the communication PCB
If the Check point 1 is ok, replace the communication PCB
OK
Check Point 3 : Replace the controller PCB
If condition is doesn’t change, replace the controller PCB
02-11
Indicate or Display:
Trouble shooting 11
INDOOR UNIT Error Method:
Outdoor unit : No indication
Error code : 41
Indoor Room Thermistor Error
Detective Actuators:
Detective details:
Indoor Unit Controller PCB Circuit
Indoor Temperature Thermistor
Indoor unit thermistor is open or short is detected always.
Forecast of Cause : 1. Connector failure connection
2. Thermistor failure 3. Controller PCB failure
Check Point 1 : Check connection of Connector
Check if connector is loose or removed
Check erroneous connection
Check if thermistor cable is open
>>Reset Power when reinstalling due to removed connector or incorrect wiring.
OK
Check Point 2 : Remove connector and check Thermistor resistance value
Thermistor Characteristics(Rough value)
0
5
10
15
20
25
30
35
33.6
25.9
20.2
15.8
12.5
10.0
8.0
6.5
(°C )
40
45
50
Resistance value (k )
5.3
4.35
3.59
Temperature
(°C )
Resistance value (k )
Temperature
If Thermistor is either open or shorted, replace it and reset the power.
OK
Check Point 3 : Check Voltage of Controller PCB (DC 5.0V)
Make sure circuit diagram of each indoor unit and check terminal voltage at Thermistor (DC5.0V)
CN32
CN8
1
BLACK
2
BLACK
1
BLACK
2
H/E Thermistor
BLACK
Room Temp. Thermistor
If the voltage does not appear, replace Controller PCB and execute the check operation again.
02-12
DC
Trouble
rouble shooting 12
INDOOR UNIT Error Method:
Indicate or Display:
Indoor Heat Ex. Thermistor Error
Error code : 42
Detective Actuators:
Detective details:
Indoor Unit Controller PCB
Heat Exchanger (MID) Thermistor
Indoor unit thermistor is open or short is detected always.
Forecast of Cause : 1. Connector failure connection
Outdoor unit : No indication
2. Thermistor failure 3. Controller PCB failure
Check Point 1 : Check connection of Connector
Check if connector is loose or removed
Check erroneous connection
Check if thermistor cable is open
>>Reset Power when reinstalling due to removed connector or incorrect wiring.
OK
Check Point 2 : Remove connector and check Thermistor resistance value
Thermistor Characteristics(Rough value)
Temperature
(°C )
Resistance value (k )
Temperature
(°C )
Resistance value (k )
0
5
10
15
20
25
30
35
176
134
103
80.3
62.9
49.7
39.6
31.7
40
45
50
25.6
20.8
17.1
If Thermistor is either open or shorted, replace it and reset the power.
OK
Check Point 3 : Check voltage of Controller PCB (DC5.0V)
Make sure circuit diagram of each indoor unit and check terminal voltage at Thermistor (DC5.0V)
CN32
CN8
1
BLACK
2
B
BLACK
1
BLACK
2
H/E Thermistor
BLACK
Room Temp. Thermistor
If the voltage does not appear, replace Controller PCB and execute the check operation again.
02-13
DC
Trouble shooting 13
INDOOR UNIT Error Method:
Indicate or Display:
Human sensor error
Error code : 44
Detective Actuators:
Detective details:
Indoor unit Main PCB
Outdoor unit: No indication
1 Detect the open condition of the sensor.
2 When the signal from the sensor is "L"(=0V) for more than 10 min.
Forecast of Cause:
1. Connection failure
2. Sensor failure
3. Indoor unit Main PCB failure
Check Point 1 : Check the connector connection and cable open
Check if connector is loose or removed
Check erroneous connection
Check if sensor cable is open
>>Reset Power when reinstalling due to removed connector or incorrect wiring.
OK (Sensor connections error)
OK(Sensor signal error)
Check Point 2 : Conduction check
Check Point 2 : Voltage check
Disconnect the sensor and check the 2-3pin
on sensor connector.
Disconnect the sensor and check the Voltage
of 1pin of the CN10 on the Main PCB
>>With conduction : Main PCB failure
>>Without conduction : Sensor failure
>>5V: Sensor failure
>>Other than 5V: Main PCB failure
02-14
Trouble shooting 14
INDOOR UNIT Error Method:
Indoor Unit Fan Motor Error
Detective Actuators:
Indicate or Display:
Error code : 51
Outdoor unit : No indication
Detective details:
Indoor unit Power Supply PCB
Indoor unit fan motor
When the fan motor speed is less than 1/3 of the target fan speed
for 56 seconds.
When detect the 0 rpm for 56 seconds after fan motor started.
Forecast of Cause:
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
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.
OK
Check Point 2 : Check ambient temp. around motor
Check excessively high temperature around the motor.
(if there is any surrounding equipment that causes heat)
>>Upon the temperature coming down, restart operation.
OK
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.
OK
Check Point 4 : Replace Power Supply PCB
If Check Point 1- 3 do not improve the symptom, replace Power Supply PCB.
02-15
Indicate or Display:
Trouble shooting 15
INDOOR UNIT Error Method:
Error code : 53
Drain pump Error
Outdoor unit : No indication
Detective Actuators:
Detective details:
Indoor Unit Controller PCB Circuit
Float Switch
When Float switch is ON for more than 3 minutes.
Forecast of C ause : 1. Float switch failure 2. Shorted connector/wire 3. Controller PCB failure
4. Drain pump failure 5. Hose clogging
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
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
OK
Check Point 3 : Check Drain Hose
Check Drain Hose .
>>If there is Hose clogging. Please clear the clog.
OK
Check Point 4 : Check Controller PCB and Drain Pump
Check Drain Pump.
If drain pump is not run on the working condition, check the voltage of the CN71 on the controller PCB.
DC12V
CN71
B
CN71-1
RED
CN71-2
CN71-3
WHITE
DC DRAIN PUMP MOTOR
M
CN71-4
Measurement result
12V
: Replace the Drain Pump
Other than 12V : Replace the controller PCB
02-16
Trouble shooting 16
OUTDOOR UNIT Error Method:
Indicate or Display:
Outdoor unit main PCB model
information error
Error code : 62
Detective Actuators:
Detective details:
Outdoor unit Main PCB
Outdoor unit : No indication
Access to EEPROM failed due to some cause after outdoor unit started.
Forecast of Cause:
1. External cause (Noise, temporary open, voltage drop)
Check Point 1-1 : Reset Power Supply and operate
2. Main PCB failure
NO
Does Error indication show again?
YES
Check Point 1-2 : Check external cause
Check Point 2 : Replace Main PCB
Check if temporary voltage drop was not generated.
Check if momentary open was not generated.
Check if ground is connection correctly or there are no related
cables near the power line.
Change Main PCB.
02-17
Trouble shooting 17
Indicate or Display:
Inverter error
Error code : 63
OUTDOOR UNIT Error Method:
Detective Actuators:
Outdoor unit : No indication
Detective details:
Outdoor unit Main PCB
Error information received from Outdoor unit Main PCB
Forecast of Cause :
1. External cause.
2. Power supply to Main PCB wiring disconnection, open
3. Outdoor unit Main PCB failure
Check Point 1-1 : Turn the power on again?
NO
Error displayed again?
YES
Check Point 2 : Check the wiring
Check Point 1-2: External cause
Connector and wiring connection state check
Check if temporary voltage drop was not generated.
Cable open check
Check if temporary open was not generated.
Check if ground is connected correctly or
there are no related cables near the power line.
OK
Check Point 3 : Replace Main PCB
Replace Outdoor unit Main PCB.
02-18
Trouble shooting 18
OUTDOOR
UNIT Error Method:
INDOOR
UNIT
PFC circuit error
Detective Actuators:
Indicate or Display:
Outdoor unit : No indication
Error code : 64
Detective details:
When inverter output DC voltage is higher than 420V for over 3 seconds,
the compressor stops.
If the same operation is repeated 5 times, the compressor stops permanently.
Outdoor unit Main PCB
Forecast of Cause :
1. External cause
2. Connector connection failure
3. Main PCB failure
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.
OK
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.
OK
Check Point 3 : Replace Main PCB
If Check Point 1, 2 do not improve the symptom, change Main PCB.
2-19
Trouble shooting 19
OUTDOOR UNIT Error Method:
Trip terminal L error
Detective Actuators:
Outdoor unit Main PCB
Indicate or Display:
Error code : 65
Outdoor unit : No indication
Detective details:
When the signal from FO terminal of IPM is "L"(=0V)
while the compressor stops.
Forecast of Cause:
1. Outdoor unit Main PCB failure
Check Point 1 : Replace Main PCB
Replace Outdoor unit Main PCB.
2-20
Trouble shooting 20
OUTDOOR UNIT Error Method:
Discharge Thermistor Error
Detective Actuators:
Indicate or Display:
Detective details:
Discharge temperature thermistor
Forecast of Cause :
Outdoor unit : No indication
Error code : 71
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
OK
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".
OK
DC
Check Point 3 : Check voltage of Main PCB (DC5.0V)
BLACK
BLACK
BLACK
BLACK
THERMISTOR
(DIS.PIPE.)
THERMISTOR
(PIPE )
Main PCB CN71:3-4 voltage value =5V
Remove the thermistor from Main PCB, check the voltage.
4 3 2 1
4 3 2 1
CN71
If the voltage does not appear, replace Main PCB,
and execute the check operation again.
02-21
Trouble shooting 21
OUTDOOR UNIT Error Method:
Compressor Thermistor Error
Detective Actuators:
Outdoor unit : No indication
Error code : 72
Detective details:
Compressor temperature thermistor
Forecast of Cause :
Indicate or Display:
Compressor temperature thermistor short detected
Compressor 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
OK
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".
OK
DC
Check Point 3 : Check voltage of Main PCB (DC5.0V)
BLACK
BLACK
THERMISTOR
(COMP.TEMP.)
Main PCB CN73:1-3 voltage value =5V
Remove the thermistor from Main PCB, check the voltage.
1 2 3
1 2 3
CN73
If the voltage does not appear, replace Main PCB, and execute
the check operation again.
02-22
Trouble shooting 22
OUTDOOR UNIT Error Method:
Heat Ex. Outlet Temp.
Thermistor Error
Indicate or Display:
Detective Actuators:
Detective details:
Heat exchanger liquid temperature
thermistor
Forecast of Cause :
Outdoor unit : No indication
Error code : 73
Heat exchanger outlet 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
OK
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".
OK
DC
Check Point 3 : Check voltage of Main PCB (DC5.0V)
THERMISTOR
(PIPE.)
BLACK
BLACK
BLACK
BLACK
THERMISTOR
(DIS.PIPE.)
Main PCB CN71:1-2 voltage value =5V
Remove the thermistor from Main PCB, check the voltage.
4 3 2 1
4 3 2 1
CN71
If the voltage does not appear, replace Main PCB, and execute
the check operation again.
02-23
Trouble shooting 23
OUTDOOR UNIT Error Method:
Indicate or Display:
Outdoor Thermistor Error
Error code : 74
Detective Actuators:
Detective details:
Outdoor temperature thermistor
Forecast of Cause :
Outdoor unit : No indication
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
OK
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".
OK
DC
Check Point 3 : Check voltage of Main PCB (DC5.0V)
BLACK
BLACK
THERMISTOR
(OUT TEMP.)
Main PCB CN70:1-3 voltage value =5V
Remove the thermistor from Main PCB, check the voltage.
3 2 1
3 2 1
CN70
If the voltage does not appear, replace Main PCB, and execute
the check operation again.
02-24
Trouble shooting 24
OUTDOOR UNIT Error Method:
Heat Sink Thermistor Error
Detective Actuators:
Outdoor unit Main PCB
Forecast of Cause :
Indicate or Display:
Outdoor unit : No indication
Error code : 77
Detective details:
Heat sink temperature thermistor (Built-in IPM) open/short detected
1. Main PCB failure
If this error is displayed, replace Main PCB
Attention!!
This unit does not have a heat sink themistor
In this case, replace Main PCB
02-25
Trouble shooting 25
OUTDOOR UNIT Error Method:
Current sensor error
Indicate or Display:
Outdoor unit : No indication
Error code : 84
Detective details:
Detective Actuators:
Outdoor unit Main PCB
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)
Forecast of Cause :
1. Defective connection of electric components
Check Point 1-1 : Reset Power Supply and operate
2. External cause
3. Main PCB failure
NO
Does Error indication show again?
YES
Check Point 2 :
Check connections of Outdoor Unit Electrical Components
Check if the terminal connection is loose.
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 1-2 :
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.
OK
Check Point 4 : Replace Main PCB
If Check Point 1, 2 do not improve the symptom, change Main PCB.
02-26
Indicate or Display:
Trouble shooting 26
OUTDOOR UNIT Error Method:
Outdoor unit : No indication
Pressure Sensor Error
Error code : 86
Detective Actuators:
Detective details:
High pressure switch
When the power was turned on, "high pressure switch : open" was detected.
Forecast of Cause :
1. High pressure switch connector disconnection, open
2. High pressure switch characteristics failure3. Main PCB failure
Check Point 1 : Check the high pressure switch connection state
Connector and wiring connection state check
Cable open check
OK
Check Point 2 : Check the high pressure switch characteristics
Switch characteristics check
* For the characteristics of high pressure switch, refer to below.
OK
Check Point 3 : Replace Main PCB
Change Main PCB,
and execute the check operation again.
Type of contact
C
H
Pressure
Characteristics of pressure switch (CN 74)
Pressure switch 1
Contact : Short
Open
4.2 0.1MPa
Contact : Open
Short
3.2 0.15MPa
02-27
Trouble shooting 27
OUTDOOR UNIT Error Method:
Trip detection
Detective Actuators:
Outdoor unit Main PCB
Compressor
Indicate or Display:
Error code : 94
Outdoor unit : No indication
Detective details:
"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.
Forecast of Cause : 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)
Check Point 1 : Check the outdoor unit fan operation, heat exchanger, ambient temperature
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?
OK
Check Point 2: Replace Main PCB
If Check Point 1 do not improve the symptom, change Main PCB.
OK
Check Point 3: Replace Compressor
If Check Point 2 do not improve the symptom, change Compressor.
02-28
Trouble shooting 28
OUTDOOR UNIT Error Method:
Indicate or Display:
Compressor rotor position
detection error
Error code : 95
Detective Actuators:
Detective details:
Outdoor unit Main PCB
Compressor
Outdoor unit : No indication
While running the compressor, if the detected rotor location is out of
phase with actual rotor location more than 105°,
the compressor stops.
After the compressor restarts, if the same operation is repeated
within 40sec, the compressor stops again.
If
and
repeats 5 times, the compressor stops permanently.
Forecast of Cause :
1. Defective connection of electric components
2. Main PCB failure
Check Point 1 : Check Noise from Compressor
Turn on Power and check operation noise.
If an abnormal noise show, replace Compressor.
OK
Check Point 2 : Check connection of around the Compressor components
For Compressor Terminal, Main PCB
Check if connector is removed.
Check erroneous connection.
Check if cable is open.
(Refer to PARTS INFORMATION 2)
>>Upon correcting the removed connector or mis-wiring, reset the power.
OK
Check Point 3: Replace Main PCB
If Check Point 1,2 do not improve the symptom, change Main PCB.
OK
Check Point 4: Replace Compressor
If Check Point 3 do not improve the symptom, change Compressor.
02-29
3. Compressor failure
Trouble shooting 29
OUTDOOR UNIT Error Method:
Outdoor Unit Fan Motor Error
Indicate or Display:
Outdoor unit : No indication
Error code : 97
Detective details:
Detective Actuators:
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.
Outdoor unit Main PCB
Outdoor unit fan motor
Forecast of Cause:
1. Fan rotation failure 2. Motor protection by surrounding temperature rise
4. Outdoor unit fan motor failure
3. Main PCB 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.
OK
Check Point 2 : Check ambient temp. around motor
Check excessively high temperature around the motor.
(If there is any surrounding equipment that causes heat)
>>Upon the temperature coming down, restart operation.
OK
Check Point 3 : Check Outdoor unit fan motor
Check Outdoor unit fan motor. (PARTS INFORMATION 5)
>>If Outdoor Fan Motor is abnormal, replace Outdoor fan motor and Main PCB.
OK
Check Point 4 : Check Output Voltage of Main PCB
Check outdoor unit circuit diagram and the voltage. (Measure at Main PCB side connector)
1
2
3
CN800 4
5
6
7
1
2
3
4
5
6
7
RED
BLACK
WHITE
YELLOW
BROWN
Fan motor
Read wire
FM
Red - Black
White - Black
If the voltage is not correct, replace Main PCB.
02-30
DC voltage
280V (AC220V-10%)
~ 373V (AC240+10%)
15 1.5V
Trouble shooting 30
OUTDOOR UNIT Error Method:
4-Way Valve Error
Indicate or Display:
Detective Actuators:
Detective details:
Outdoor unit : No indication
Error code : 99
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.] > 20°C
Heating operation
[indoor heat exchanger temp.] - [Room temp.] < -14°C
If the same operation is repeated 5 times,
the compressor stops permanently.
Forecast of Cause :
1. Connector connection failure
5. Main PCB failure
2. Thermistor failure
3. Coil 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.
OK
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 11,12),
If defective, replace the thermistor.
OK
Check Point 3 : Check the solenoid coil and 4-way valve
[ Solenoid coil ]
Remove CN30 from PCB and check the resistance value of coil.
Resistance value is about 1.7k
>> 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.
OK
Check Point 4 : Replace Main PCB
If Check Point 1- 3 do not improve the symptom, replace Main PCB.
02-31
4. 4-way valve failure
Trouble shooting 31
OUTDOOR UNIT Error Method:
Discharge Temp. Error
Indicate or Display:
Detective Actuators:
Detective details:
Outdoor unit : No indication
Error code : A1
Discharge temperature thermistor
"Protection stop by "discharge temperature
115°C during compressor
operation'''' generated 2 times within 24 hours.
Forecast of Cause : 1. 3-way valve not opened
2. EEV defective, strainer clogged
3. Outdoor unit operation failure, foreign matter on heat exchanger
4. Discharge temperature thermistor failure
5. Insufficient refrigerant
<Heating operation>
<Cooling operation>
Check Point 1 : Check if 3-way valve(gas side) is open.
Check Point 1 : Check if 3-way valve(liquid side) is open.
If the 3-way valve(gas side) was closed, open the
3-way valve(gas side) and check operation.
If the 3-way valve(liquid side) was closed, open the
3-way valve(liquid side) and check operation.
OK
Check Point 2 : Check the EEV, strainer
OK
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 "
EEV open?
Strainer clogging check (before and after EEV, ACM
oil return)
Refer to "Service Parts Information 3"
OK
OK
Check Point 3 : Check the outdoor unit fan,heat exchanger
Check for foreign object at heat exchanger
Check if fan can be rotated by hand.
Motor check(PARTS INFORMATION 5)
OK
Check Point 4 : Check
the discharge thermistor
:
Discharger thermistor characteristics check
(Check by disconnecting thermistor from PCB. Refer to the Troubleshooting 20)
OK
Check Point 5 : Check the refrigerant amount
Leak check
02-32
Trouble shooting 32
OUTDOOR UNIT Error Method:
Indicate or Display:
Compressor Temp. Error
Error code : A3
Detective Actuators:
Detective details:
Compressor temperature thermistor
Outdoor unit : No indication
"Protection stop by "compressor temperature"
operation""generated 2 times within 24 hours
110°C during compressor
Forecast of Cause : 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
<Cooling operation>
<Heating operation>
Check Point 1 : Check if 3-way valve(gas side) is open.
Check Point 1 : Check if 3-way valve(liquid side) is open.
If the 3-way valve(gas side) was closed, open the
3-way valve(gas side) and check operation.
If the 3-way valve(liquid side) was closed, open the
3-way valve(liquid side) and check operation.
OK
Check Point 2 : Check the EEV, strainer
OK
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".
EEV open?
Strainer clogging check (before and after EEV, ACM
oil return)
Refer to "Service Parts Information 3 "
OK
Check Point 3 : Outdoor unit fan, heat exchanger check
OK
Check for foreign object at heat exchanger
Check if fan can be rotated by hand.
Motor check(PARTS INFORMATION 5)
OK
Check Point 4 : Check the compressor temperature thermistor
Compressor temperature thermistor characteristics check
(Check by disconnecting thermistor from PCB Refer to the Troubleshooting 21)
OK
Check Point 5 : Check the refrigerant amount
Leak check
02-33
2-3 TROUBLE SHOOTING WITH NO ERROR CODE
Trouble shooting 33
Forecast of Cause:
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.
OK
Check Point 2 : Check external cause at Indoor and Outdoor (Voltage drop or Noise)
Instant drop ----- Check if there is a large load electric apparatus in the same circuit.
Momentary power failure ----- Check if there is a defective contact or leak current in
the power supply circuit.
Noise ----- Check if there is any equipment causing harmonic wave near electric line.
(Neon bulb or electric equipment that may cause harmonic wave)
Check the complete insulation of grounding.
OK
Check Point 3 : Check Electrical Components
Check the voltage of power supply.
>> Check if AC198 - 264V appears at Outdoor Unit Terminal L - N.
YES
Check Fuse in Filter PCB.
>> If Fuse is open, check if the wiring between Terminal and Filter PCB
is loose, and replace Fuse.
Check Varistor in Filter PCB.
>> If Varistor is defective, there is a possibility of an abnormal power supply.
Check the correct power supply and replace Varistor.
Upon checking the normal power supply, replace Varistor.
OK
If the symptom does not change by above Check 3, replace Main PCB.
02-34
NO
Trouble shooting 34
Forecast of Cause:
Outdoor unit - No Power
1. Power Supply failure 2. External cause
3. Electrical Components defective
Check Point 1 : Check Installation Condition
Isn’t the breaker down?
Check loose or removed connection cable.
>>If abnormal condition is found, correct it by referring
to Installation Manual or Data & Technical Manual.
OK
Check Point 2 : Check external cause at Indoor and Outdoor (Voltage drop or Noise)
Instant drop ----- Check if there is a large load electric apparatus in the same circuit.
Momentary power failure ----- Check if there is a defective contact or leak current in the power supply circuit.
Noise ----- Check if there is any equipment causing harmonic wave near electric line.
(Neon bulb or electric equipment that may cause harmonic wave)
Check the complete insulation of grounding.
OK
Check Point 3 : Check Electrical Components
Check the voltage of power supply.
>> Check if AC198 - 264V appears at Outdoor unit Terminal L - N.
YES
Check Fuse in Main PCB.
>> If Fuse is open, check if the wiring between Terminal and Main PCB is loose,
and replace Fuse.
OK
If the symptom does not change by above Check 3, replace Main PCB.
02-35
NO
Trouble shooting 35
Forecast of Cause:
No Operation (Power is ON)
1. Setting/ Connection failure 2. External cause
3. Electrical Component defective
Check Point 1 : Check indoor and outdoor installation condition
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.
OK
Turn off Power and check/ correct followings.
Is there loose or removed communication line of Indoor Unit and Outdoor Unit?
OK
Check Point 2 : Check external cause at Indoor and Outdoor (Voltage drop or Noise)
Instant drop ----- Check if there is a large load electric apparatus in the same circuit.
Momentary power failure ----- Check if there is a defective contact or leak current in the power supply circuit.
Noise ----- Check if there is any equipment causing harmonic wave near electric line.
(Neon bulb or electric equipment that may cause harmonic wave)
Check the complete insulation of grounding.
OK
Check Point 3 : Check Wired Remote Controller and Controller PCB
Check Voltage at CN14 of Controller PCB. (terminal 1-3)
(Power supply to Remote Control)
>> If it is DC13V, Remote Control is failure. (Controller PCB is normal)
>> Replace Remote Control
>> If it is DC 0V, Controller PCB is failure. (Check Remote Control once again) >> Replace Controller PCB
>> If the symptom does not change by above Check 1, 2, 3, replace Main PCB of Outdoor unit.
02-36
Trouble shooting 36
No Cooling / No Heating
Forecast of Cause:
1. Indoor Unit error 2. Outdoor Unit error
3. Effect by Surrounding environment
4. Connection Pipe / Connection Wire failure
5. Refrigeration cycle failure
Check Point 1 : Check Indoor Unit
Does Indoor Unit FAN run on HIGH FAN?
Is Air Filter dirty?
Is Heat Exchanger clogged?
Check if Energy save function is operated.
OK
Check Point 2 : Check Outdoor Unit Operation
Check if Outdoor Unit is operating
Check any objects that obstruct the air flow route.
Check clogged Heat Exchanger.
Is the Valve open?
OK
Attention
Check Point 3 : Check Site Condition
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.
Is capacity of Indoor Unit fitted to Room size?
Any windows open? Or direct sunlight ?
OK
Pipe (In)
Check Point 4 :
Check Indoor/ Outdoor Installation Condition
Pipe (Out)
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.
OK
MPa MPa
Check Point 5 : Check Refrigeration Cycle
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)
02-37
Pipe (In)
Pipe (Out)
Trouble shooting 37
Abnormal Noise
Forecast of Cause :
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 Main Unit installed in stable condition?
Is the installation of Air suction grille and
front panel normal?
Is Main Unit installed in stable condition?
Is Fan Guard installed normally?
OK
OK
Is Fan broken or deformed?
Is the screw of Fan loose?
Is there any object which obstruct the Fan rotation?
Is Fan broken or deformed?
Is the screw of Fan loose?
Is there any object which obstruct the Fan rotation?
OK
Check if vibration noise by loose bolt or contact noise
of piping is happening.
OK
Is Compressor locked?
>> Check Compressor (PARTS INFORMATION 1,2)
Trouble shooting 39
Forecast of Cause:
Water Leaking
1. Erroneous installation 2. Drain hose failure
Diagnosis method when water is spitting out.
Diagnosis method when water leak occurs
Is Main Unit installed in stable condition?
Is Main Unit broken or deformed at the time of
transportation or maintenance?
Is the filter clogged?
OK
OK
Check Gas Pressure and correct it
if there was a gas leak.
Is Drain Hose connection loose?
Is there a trap in Drain Hose?
Is Drain Hose clogged?
OK
Is Fan rotating?
02-38
MPa MPa
2-4 SERVICE PARTS INFORMATION
SERVICE PARTS INFORMATION 1
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).
>> If there is no failure, the defect of
Compressor is considered (Locked
compressor due to clogged dirt or
less oil)
Abnormal noise
Stops soon after starting up
Is there open or loose connection
cable?
Check if vibration noise by
loose bolt or contact noise
of piping is happening.
Is Gas Pipe Valve open?
(Low Pressure is too low)
Defective Compressor
can be considered.
(due to inside dirt clogging
or broken component)
MPa MPa
Check if Refrigerant is leaking.
(Recharge Refrigerant)
Replace Compressor
Check if Strainer is clogged.
(PARTS INFORMATION 3)
Replace Compressor
Check Main PCB, connection of Compressor,and winding
resistance. (Refer to the next page).
>> If there is no failure, the defect of Compressor can be
considered. (Compression part broken or valve defective.)
Replace Compressor
02-39
SERVICE PARTS INFORMATION 2
Inverter Compressor
Check Point 1 : Check Connection
Check terminal connection of Compressor
(loose or incorrect wiring)
Main PCB
Terminal cover opened
T(W)
(BLACK)
R(U)
(RED)
W7
W8
W9
(U)
(V)
(W)
S(V)
(WHITE)
BLACK
WHITE
RED
Compressor
Check Point 2 : Check Winding Resistance
Check winding resistance of each terminal
If the resistance value is 0 or infinite, replace Compressor.
U
Resistance Value :
0.818 at 20°C
W
V
Check Point 3 : Replace Main PCB
If the symptom does not change with above Check 1, 2, replace Main PCB.
02-40
SERVICE PARTS INFORMATION 3
Outdoor unit Electronic Expansion Valve
( EEV )
Check Point 1 : Check Connections
Check connection of connector
( Loose connector or open cable )
CN40
1
2
3
4
5
RED
BLUE
ORANGE
YELLOW
WHITE
EXPANSION
VALVE COIL
EV
Check Point 3 : Check Noise at start up
Check Point 2 : Check Coil of EEV
Remove connector, check each winding
resistance of Coil.
Read wire
Resistance value
Turn on Power and check operation noise.
If an abnormal noise does not show,
replace Main PCB.
White - Red
Yellow - Red
46
Orange - Red
Check Point 4 : Check Voltage from Main PCB.
4
Remove Connector and check Voltage (DC12V)
at 20°C
If it does not appear, replace Main PCB.
Blue - Red
DC
If Resistance value is abnormal, replace EEV.
Check Point 5 : Check Opening and Closing Operation of Valve
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.
CLOSE
Example : Hot Gas
OPEN
Example : Hot Gas
Pipe (In)
Pipe (In)
Pipe (Out)
Pipe (Out)
Check Point 6 : Check Strainer
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.
Pipe (In)
Pipe (In)
Pipe (Out)
02-41
Pipe (Out)
SERVICE PARTS INFORMATION 4
Indoor unit fan motor
Check Point 1 : Check rotation of Fan
Rotate the fan by hand when operation is off.
(Check if fan is caught, dropped off or locked motor)
>>If Fan or Bearing is abnormal, replace it.
Check Point 2 : Check resistance of Indoor unit Fan Motor
Refer to below. Circuit-test "Vm" and "GND" terminal.
(Vm: DC voltage, GND: Earth terminal)
>>If they are short-circuited (below 300 k ), replace Outdoor fan motor and Main PCB.
Pin number
(wire color)
Terminal function
(symbol)
1 (Red)
2
3
DC voltage(Vm)
4 (Black)
5 (White)
6 (Yellow)
7 (Brown)
(GND)
No function
No function
Control voltage (Vcc)
Speed command (Vsp)
Feed back (FG)
SERVICE PARTS INFORMATION 5
Outdoor unit fan motor
Check Point 1 : Check rotation of Fan
Rotate the fan by hand when operation is off.
(Check if fan is caught, dropped off or locked motor)
>>If Fan or Bearing is abnormal, replace it.
Check Point 2 : Check resistance of Outdoor Fan Motor
Refer to below. Circuit-test "Vm" and "GND" terminal.
(Vm: DC voltage, GND: Earth terminal)
>>If they are short-circuited (below 300 k ), replace Outdoor fan motor and Main PCB.
Pin number
(wire color)
1 (Red)
2
3
4 (Black)
5 (White)
6 (Yellow)
7 (Brown)
Terminal function
(symbol)
DC voltage (Vm)
No function
No function
Earth terminal (GND)
Control voltage (Vcc)
Speed command (Vsp)
Feed back (FG)
02-42
SERVICE PARTS INFORMATION 8
Thermistor
Check Point : Check Thermistor resistance value
Remove connector and check Thermistor resistance value.
Temperature
[°C]
- 20
- 10
- 5
0
5
10
15
20
25
30
40
50
60
70
80
90
100
110
120
Thermistor A
------168.6
129.8
100.9
79.1
62.6
49.8
40.0
26.3
17.8
12.3
8.7
6.3
4.6
3.4
2.6
2.0
Applicable
Thermistors
Discharge temp. TH
Compressor temp. TH
Resistance Value [ k ]
Thermistor B
Thermistor C
--105.4
27.8
58.2
21.0
44.0
16.1
33.6
12.4
25.9
9.6
20.2
7.6
15.8
6.0
12.5
4.8
10.0
3.8
8.0
2.5
5.3
1.7
3.6
1.2
--------------------------Heat exchanger. TH
Outdoor temp. TH
02-43
Thermistor D
--27.4
20.7
15.8
12.2
9.5
7.5
5.9
4.7
3.8
2.5
1.7
1.2
0.8
0.6
0.4
0.3
----Heat sink temp. TH
3-3-17,Suenaga,Takatsu-ku,Kawasaki 213-8502,Japan
Dec. 2015 Printed in Japan
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