Fujitsu ARTG30LHTA Original operating manual

SPLIT TYPE
ROOM AIR CONDITIONER
DUCT type
Models Indoor unit Outdoor unit
ARTG30LHTA
ARTG36LHTA
ARTG45LHTA
ARTG54LHTA
AOTG30LATL
AOTG36LATL
AOTG45LATL
AOTG54LATL
INVERTER
SERVICE
INSTRUCTION
R410A

CONTENTS
1. SPECIFICATIONS
1. DESCRIPTION OF EACH CONTROL OPERATION
1-1-1 COOLING CAPACITY CONTROL......................................................................
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
01-01
1-2-1 HEATING CAPACITY CONTROL......................................................................
1-2 HEATING OPERATION............................................................................................. 01-02
01-02
1-3-1 INDOOR UNIT CONTROL.................................................................................
1-3 DRY OPERATION...................................................................................................... 01-03
01-03
01-04
01-06
01-08
01-09
1-8 TIMER OPERATION CONTROL............................................................................... 01-10
1-9 ELECTRONIC EXPANSION VALVE CONTROL...................................................... 01-12
1-10 TEST OPERATION CONTROL............................................................................... 01-12
1-11 PREVENT TO START FOR 3 MINUTES (3 MINUTES ST).................................... 01-12
1-12 4-WAY VALVE EXTENSION SELECT.................................................................... 01-12
1-13
AUTO RESTART..................................................................................................... 01-14
1-14
PUMP DOWN.......................................................................................................... 01-13
1-15 COMPRESSOR PREHEATING............................................................................... 01-14
1-16 MINIMUM HEAT OPERATION................................................................................ 01-14
1-20 VARIOUS PROTECTIONS...................................................................................... 01-18
1-21 COMPRESSOR STOP CONTROL.......................................................................... 01-20
1-19 OFF DEFROST OPERATION CONTROL............................................................... 01-17
6. REFRIGERANT CAUTION -R410A-
3. DISASSEMBLY PROCESS
2-1-2 OUTDOOR UNIT DISPLAY................................................................................
2-1-1 WIRED REMOTE CONTROLLER DISPLAY......................................................
2-1 ERROR DISPLAY......................................................................................................
2. TROUBLE SHOOTING
2-2 TROUBLE SHOOTING WITH ERROR CODE..........................................................
2-3 TROUBLE SHOOTING WITH NO ERROR CODE....................................................
2-4 SERVICE PARTS INFORMATION............................................................................
02-01
02-01
02-03
02-30
02-04
02-35
DISASSEMBLY PROCESS( FOR ARTG45 / 54LHTA )............................................ 03-01
1-18 DEFROST OPERATION CONTROL....................................................................... 01-15
1-17 ECONOMY OPERATION........................................................................................ 01-14
1-22 DESCRIPTION OF DISPLAY UNIT......................................................................... 01-21

2 . TROUBLE SHOOTING
R410A
DUCT type
INVERTER

Indoor Room Thermistor Error
Wired Remote Controller
Communication Error
Error Contents Trouble
shooting
02-01
2 ERROR DISPLAY
2-1 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
IPM Error
Error
Code
11
12
39
41
42
51
53
59
5U
63
65
71
72
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
Current sensor Error
Pressure sensor Error
Compressor Thermistor Error
W
AR-WAF1E
AR-WDD1E
hen "Er" in Temperature Display is displayed, inspection of the air conditioning system is necessary.
Please consult authoilzed service personnel.
1. SELF - DIAGNOSIS
SU
MO
TU
WE
TH 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
When there is an error on the indoor unit:
Code : Er 41.1
R.C. address : 00
Error
Mo
10:00
Monitor
Code : XXXXXX
R.C. address : 00
Error
Mo
10:00
Monitor
Error code*
Address number of the
relevant indoor unit
a 1 digit number.
Installation manual of the indoor unit.
14
15
16
73
74
77
Outdoor Thermistor Error
Heat Sink Thermistor Error
Heat Ex. Liquid Outlet
Thermistor 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 MO TU WE TH 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

2. ERROR DETECTION
1. OUTDOOR UNIT Indicator PCB
Display when an error occurs.
POWER ERROR
PUMP
DOWN
LOW
NOISE
PEAK
CUT
MODE (L1) (L2) (L3) (L4) (L5) (L6)
Blink
(Hi speed)
Check that the “ERROR” LED blinks, then press the [Enter] button once.
For details, refer to the following table.
02-03
LEDs
Buttons
2-1-2 OUTDOOR UNIT DISPLAY
Error Contents POWER
MODE ERROR
Serial forward transfer error(after operation)
2
2
2
2
2
2
2
2
2
2
21
(L1) (L2) (L6)(L5)(L4)(L3)
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
LED DISPLAY
PUMP
DOWN
LOW
NOISE
PEAK
CUT
Trouble
shooting
2
1 - 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
1 ~ : 1~ 15 Times Blinking15
: Light ON: Light OFF 2 : 2 Times Blinking

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 AC70V and AC130V at outdoor unit terminal 1 - 3.
>> If it is abnormal, Check the parts as follows.
- Outdoor unit fan motor (PARTS INFORMATION 5)
- Active filter module (PARTS INFORMATION 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 AC70V and AC130V at outdoor unit terminal 2 - 3.
>> If it is abnormal, replace Controller PCB.
When the outdoor unit cannot properly receive the serial signal from
indoor unit for 10 seconds or more.
02-05
1
2
3
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 (Option)
1. Connection failure 2. Wired Remote Controller failure 3. Controller PCB failure
Check & correct the followings.
Check the connection of terminal between Wired Remote Controller and indoor unit,
and check if there is a disconnection of the cable.
When the indoor unit cannot properly receive the signal from
Wired Remote Controller for 1 minute or more.
02-06
Refer to error code table.
>> If it is 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 Voltage at CN14(ARTG30/36LHTA),CN140(ARTG45/54LHTA) 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.
6.58.010.012.515.820.225.933.6
3.594.355.3Resistance value (k )
OK
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)
If the voltage does not appear, replace Controller PCB and execute the check operation again.
DC
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 50
5 10 15 20 25 30 35
Resistance value (k )
H/E Thermistor
Room Temp. Thermistor
BLACK
BLACK
1
2
1
2
1 1
2 2
CN5
CN8
GRAY
GRAY
1
2
CN7
ARTG30 / 36LHTA
BLACK
BLACK
1
2
CN114
H/E Thermistor
Room Temp. Thermistor
BLACK
BLACK
1
2
CN110
ARTG45 / 54LHTA

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.
31.739.649.762.980.3103134176
17.120.825.6Resistance value (k )
Temperature (°C )
Temperature (°C ) 0
40 45 50
5 10 15 20 25 30 35
Resistance value (k )
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)
If the voltage does not appear, replace Controller PCB and execute the check operation again.
DC
H/E Thermistor
Room Temp. Thermistor
BLACK
BLACK
1
2
1
2
1 1
2 2
CN5
CN8
GRAY
GRAY
1
2
CN7
ARTG30 / 36LHTA
BLACK
BLACK
1
2
CN114
H/E Thermistor
Room Temp. Thermistor
BLACK
BLACK
1
2
CN110
ARTG45 / 54LHTA

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 CN000(ARTG30/36LHTA) /
CN000(ARTG45/54LHTA) 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 BLACK BLACK
123 4
123 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
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 BLACK BLACK
1 2 3 4
1 2 3 4

Refer to error code table.
D
C
CN63
THERMISTOR
THERMISTOR SC (LP OUT)
(HEX. PIPE. OUT.)
BLACK
BLACK
1234
1234
B
LACK
BLACK
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 again.
If the voltage does not appear,
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