Mitsubishi Heavy Industries R410A User manual

S
SE ER RV VI IC CE E
M
MA AN NU UA AL L
F
FD DA A
S
Se er ri ie es s
S
Sp pl li it t
S
Sy ys st te em ms s
F
FD DA A
S
Se er ri ie es s
M
Mu ul lt ti i
S
Sy ys st te em ms s

MITSUBISHI HEAVY INDUSTRIES - PAC SERVICE MANUAL
INDEX
MAINTENANCE DATA 2
ERROR CODES 4
PCB INDOOR UNITS 8
ERROR DISPLAY & REMEDY CHART 12
PCB OUTDOOR UNITS 22
ERROR DISPLAY – OUTDOOR UNIT 25
OPERATIONAL DATA CHECK – WIRED CONTROLLER 35
REMOTE CONTROL – WIRED 36
- SETTING FUNCTIONS 37
ERROR DISPLAY – WIRELESS CONTROL 43
REMOTE CONTROL WIRELESS 44

-
2
-
1. MAINTENANCE DATA
1.1 Servicing
(1) Evacuation
The evacuation is a procedure to purge impurities, such as noncondensable gas, air, moisture from the refrigerant equipment by
using a vacuum pump. Since the refrigerant R410A is very insoluble in water, even a small amount of moisture left in the refriger-
ant equipment will freeze, causing what is called ice clogging.
Evacuation procedure
Make sure that the both service valves of gas and liquid line are fully opened.
(a) Check to ensure that there is no internal pres-
sure in the unit. If there is an internal pres-
sure, it should be relived through the service
port.
(b) Connect the charging hose of the gauge mani-
fold to the service port of the gas piping.
Close high pressure valve 2of gange mani-
fold.
(c) Connect the charging hose A to a vacuum
pump.
Repeat evacuation in the following sequence.
Notes (1) Do not use the refrigerant pressure to expel air.
Notes (2) Do not use the compressor for evacuation.
Notes (3) Do not operate the compressor in a vacuum condition.
Vacuuming begins
Vacuuming completed
Vacuum gauge check
When the vacuum gauge's needle pointer creeps up,
there is moisture left in the system or a leak. Pull air
again after you have checked the system for a leak and
rectified it. Use a reverse flow stop adapter to prevent
the vacuum pump's lubricant oil from flowing into the
refrigerant system.
Please run the
vacuum pump for at
least one hour after
the vacuum gauge
shows -101kPa or
lower. (-755mmHg or
lower)
No increase in the
reading of the
vacuum gauge's
needle pointer.
Liquid line
Indoor unit
Outdoor unit
Gus line
Charge hose
(for R410A only)
Refrigerant
cylinder
Handle Lo
3
Vacuum
pump
Gauge manifold
(for R410A only)
Handle Hi
Charge hose A
(for R410A only)
Charge valve
Vacuum adapter
(for R410A only)
Charge port
12
Notes (1) Refer to the exterior-view drawing for the position of the service valve.
Notes (2) When connecting of ther service valve, flare connection for both the
indoor and outdoor unit.

-
3
-
(2) Refrigerant charging
(a) After the evacuation shown in the above, change the connection of the charge hose A to the refrigerant cylinder.
(b) Purge air from the charge hose A .
First loosen the connecting portion of the charge hose at the gauge manifold side and open valve 3for a few seconds, and
then immediately retighten it after observing that gas has blown out from loosened connecting portion.
(c) Open valves 1and 3then gas refrigerant begins flowing from the cylinder into the unit.
When refrigerant has been charged into the unit to some extent, refrigerant flow becomes stagnant. When that happens, start
the compressor in cooling cycle until the system is filled with the specified amount of gas, then close valves 1and 3and
remove the gauge manifold. Cover the service port with caps and tighten them securely.
(d) Check for gas leakage by applying a gas leak detector around the piping connection.
(e) Start the air conditioner and make sure of its operating condition.
1.2 Trouble shooting for refrigerant circuit
(1) Judgement of operating condition by operation pressure and temperature difference
Making an accurate judgement requires a skill that is acquired only after years of experience, one trouble may lead to an another
trouble from a single trouble source and several other troubles may exist at the same time which comes from a undetected different
trouble source.
Filtering out the trouble sources can be done easier by comparing with daily operating conditions. Some good guides are to judge
the operating pressure and the temperature difference between suction air and delivery air.
Following are some pointers,
Pressure
Trouble cause
High side ¡
Low side ¡
High side ¡Ineffective compression
Low side ¡(defective compressor)
High side ¡
Low side ¡
High side ¡
Low side ¡
High side ¡
Low side ¡1) Too high temperature of room
1) Insufficient refrigerant in circuit
2) Clogging of strainer
3) Gas leakage
4) Clogging of air filter (in cooling)
5) Decrease in heat load (in cooling)
6) Locking of indoor fan (in cooling)
1) Locking of outdoor unit fan (in cooling)
2) Dirty outdoor heat exchanger (in cooling)
3) Mixture of non condensable gas (air etc.)
1) Excessive overcharging of refrigerant
2) Mixture of non condensable gas (air etc.)
Indi-
cation
Circuit
Too low
A little low
Normal
A little
high
Too high

-
4
-
(1) Selfdiagnosis function
(a) Check Indicator Table
Whether a failure exists or not on the indoor unit and outdoor unit can be know by the contents of remote controller eroor code, indoor/outdoor unit green LED (power pilot lamp
and microcomputer normality pilot lamp) or red LED (check pilot lamp).
1) Indoor unit side
Outdoor unit LEDIndoor unit LED
Green
Keeps flashing
Keeps flashing
Keeps flashing
Keeps flashing
Keeps flashing
Keeps flashing
Keeps flashing
Keeps flashing
Keeps flashing
Keeps flashing
Keeps flashing
Keeps flashing
Keeps flashing
Red
Stays OFF
Stays OFF
Stay OFF or Lights
continously
Green
Keeps flashing
Keeps flashing
Keeps flashing
Keeps flashing
Keeps flashing
Keeps flashing
Stays OFF
Keeps flashing
Keeps flashing
Keeps flashing
Keeps flashing
Keeps flashing
Keeps flashing
Keeps flashing
*3 time flash
Stays OFF
Stay OFF
2 time flash
2 time flash
2 time flash
1 time flash
1 time flash
1 time flash
Stays OFF
Stays OFF
Stay OFF
Red
Stays OFF Normal
Indoor unit microcomputer failure
Indoor unit PCB fault
Outdoor unit microcomputer failure
Indoor unit heat exchanger thermistor failure
Indoor unit return air thermistor failure
The float SW operates (with FS only). Drain up kit wiring fault.
Indoor / outdoor transmission error.
Stays OFF
Stays OFF
Stays OFF
Stays OFF
Stays OFF
2 time flash
Stays OFF
Stays OFF
Stays OFF
Stays OFF
Stays OFF
Stays OFF
Stays OFF
Remote
controller
error code
No-indication
LCD flashes
continuously
or is off.
E1
E5
E6
E7
E9
E10
E28
Cause
Keeps flashing Keeps flashing1 time flash Stays OFF
E8
Stays OFF Stays OFF Stays OFF Power OFF, L phase wiring is open, power source failure
Stays OFF
Remote controller wires X and Y are reversely connected. *For wire breaking at
power ON, the LED is OFF. Remote controller wire is open. (X wire breaking : A
beep is produced and no indication is made. Z wire breaking : No beep and no
indication) The remote controller wires Y and Z are reversely connected.
The remote controller wire Y is open. The remote controller wires X and Y are
reversely connected. Noise is penetrating the remote control lines. The remote
controller or indoor control PCB is faulty. (The communications circuit is faulty.)
Keeps flashing Keeps flashingStays OFF 2 time flash Poor connection or disconnection in wires connecting the indoor and outdoor
units.
When multiple remote controllers are used for control, the power supply to some
indoor units is OFF.
When multi-unit control by remote controller is performed, the number of units is
over (more than 17 units). Two remote controller are provided for one controller is
performed.
Outdoor unit control PCB is faulty when the power is turned on, or the inverter
parts are faulty (FDCVA 151~251 type).
Heating overload (indoor heat exchanger temperature is abnormally high) and
indoor heat exchanger thermistor is faulty.
Remote controller thermistor failure
Keeps flashing Keeps flashing
Stays OFF Stays OFF
E16 Fan motor is faulty (FDTA 501, 601 type, FDKN type).
1.3Diagnosing of microcomputer circuit
Note (1) The green LED in the outdoor unit is used in the FDCA301 ~ 601 models only.

-
5
-
Outdoor unit LEDIndoor unit LED
Green
Keeps flashing
Keeps flashing
Keeps flashing
Keeps flashing
Keeps flashing
Keeps flashing
Keeps flashing
Keeps flashing
Keeps flashing
Keeps flashing
Keeps flashing
Keeps flashing
Keeps flashing
Keeps flashing
Keeps flashing
Keeps flashing
Keeps flashing
Keeps flashing
Red Green
Stays OFF
Stays OFF
Stays OFF
Stays OFF
Stays OFF
Stays OFF
Stays OFF
Stays OFF
Stays OFF
Stays OFF
1 time flash
1 time flash
1 time flash
1 time flash
1 time flash
1 time flash
1 time flash
1 time flash
1 time flash
1 time flash
Red
Wiring is open or reversal phase (FDCA 301~601 type)
Abnormal current cut of compressor (FDCA 301~601 type)
52C secondary side L3-phase wiring is open. (FDCA 301~601 type)
Discharge temperature abnormality.
Discharge pipe thermistor failure
63H1 operation (FDCA 301~601 type)
Outdoor air temperature thermistor failure
Inverter Over-voltage Trouble. (FDCVA 151~251 type)
DC fan motor abnormal. (FDCVA 151~251 type)
Remote
controller
error code
E32
E33
E34
E36
E37
E38
E39
E40
E47
E48
Cause
Keeps flashing Keeps flashing
Stays OFF 1 time flash
E35
Keeps flashing Stays OFF 1 time flash Current (Abnormalities in a compressor over current)
E42
Keeps flashing Keeps flashing
Stays OFF Lights contiously 52C abnormal. (FDCA 301~601 type)
E52
Keeps flashing
Keeps flashing
Stays OFF 1 time flash Power transistor thermistor is faulty or disconnection or connector
connections are poor. (FDCVA 151~251 type)
E56
Keeps flashing Stays OFF 1 time flash Insufficient refrigerant.
E57
1 time flash
Keeps flashing Stays OFF 2 time flash Compressor startup error (FDCVA 151~251 type)
E59
3 time flash
Keeps flashing Stays OFF 1 time flash Compressor loader position detection error. (FDCVA 151~251 type)
E60
Outdoor unit heat exchanger thermistor
failure
Outdoor heat exchanger temperature is high or outdoor heat exchanger thermistor
is faulty.
Inverter primary side current is abnormal. (FDCVA151~251 type)
2) Outdoor unit side
Note (1) The green LED in the outdoor unit is used in the FDCA301 ~ 601 models only.

-
6
-
Section Display section
Error code of remote controller
Inspection LED (red) of indoor unit PCB
Inspection LED (red) of outdoor unit PCB
• Displays the error of higher priority (When plural errors are persisting)
• Displays the present errors.
(When a new error has occurred after the former error was reset.)
Error detail Error code Timing of error detection
Wrong connection between the indoor and
outdoor units. “ Wait ”
Normally, 30 seconds after the power is turned ON.
Normally after the power is turned ON (during communications).
Broken wire of heat exchanger thermistor
Drain error (float switch motion)
No communications even once with the outdoor unit.
After 1 or more communications of the indoor unit with the remote controller
following power on, transmission errors cause an interruption for 2 minutes.
After communications with the outdoor unit 1 or more times, communications
are abnormal continuously for 2 minutes.
When an input temperature of –50°C or lower is measured by the return air
thermistor is measured for 5 seconds or longer within 60 minutes after the
first detection.
When an input temperature of –50°C or lower is measured by the heat
exchanger thermistor is measured for 5 seconds or longer within 60 minutes
after the first detection.
Transmission error of remote controller
indoor unit
Transmission error between indoor/outdoor
units
The number of connected indoor units
exceeds the connection limit (when
multiple units are control by a single remote
controller).
Broken wire of indoor unit return air
thermistor
······················
Error detail Error code Timing of error detection
Broken wire of heat exchanger thermister
Broken wire of discharge pipe thermistor
Broken wire of outdoor air temperature
thermistor
Broken wire of power transistor
thermistor
When a thermistor input temperature of –30°C or lower is measured for 5
seconds or longer 3 times within 40 (60) minutes after the 1st detection
between 2 minutes and 2 minutes 20 seconds after compressor operation
starts.
When a thermistor input temperature of –30°C or lower is measured for 5
seconds or longer 3 times within 40 (60) minutes after the 1st detection
between 2 minutes and 2 minutes 20 seconds after compressor operation
starts.
When a thermistor input temperature of –10°C or lower is measured for 5
seconds or longer 3 times within 40 (60) minutes after the 1st detection
between 10 minutes and 10 minutes 20 seconds (between 2 minutes and 2
minutes 20 seconds) after compressor operation starts.
When the under-dome thermistor input temperature of –10°C is measured for
5 seconds or longer 3 times within 40 minutes after the 1st detection between
10 minutes and 10 minutes 20 seconds after compressor operation starts.
(b) Display sequence of error, inspection display lamp
1) One kind error
Display corresponding to the error is shown.
2) More than one errors.
3) Timing of error detection
●Indoor unit side.
Notes (1) Values in ( ) show for the FDCA301~601 models.
(2) The power transistor temperature sensor is used in the FDCVA151~251 models only.
●Outdoor unit side.

-
7
-
4) Recording and reset of error
Notes (1) Priority is in the order of E1 > ... > E10 > ... > E60.
(2) Procedures of trouble diagnosis
When any error occurs, inspect in following sequence. Detailed explanation on each step is given later in this text.
Note (1) It means the operation to turn off the power and back on again more than 1 min. later in order to reset the malfunction of microcomputer due to the
effect of power supply conditions or accidental noise.
Error display Memory Reset
Error code of remote
controller
Indoor unit inspection lamp
(red)
• Saves in memory the mode (1) of higher
priority
• Stop the unit operation by pressing the ON/OFF switch of remote
controller.
• Operation can be started again if the error has been reset.
• Saves in memory the mode (1) of higher
priority
• Cannot save in memory
Outdoor unit inspection lamp
(red)
Error Power supply reset
(1)
Check of inspection display [In-
door/outdoor unit PCB, remote
controller or Indication board]
Check of inspection display [In-
door/outdoor unit PCB, remote
controller or Indication board]
Power supply check
(indoor/outdoor unit)
Replacement or repair of defective
parts Test run/adjustment
Check of unit
controller
Indoor unit
Outdoor unit
: Press the ON/OFF button on the remote controller. Or disconnect and reconnect the power supply connector
(CNW1 or CNW0) on the indoor unit control PCB or turn the main power supply OFF.
: Turn the main power supply OFF.
(3) Error diagnosis procedures at the indoor unit side
To diagnose the error, measure the voltage (AC, DC), resistance, etc. at each connector around the circuit board of indoor unit
based on the inspection display or the operation state of unit (no operation of compressor or blower, no switching of 4-way valve,
etc.) If any defective parts are discoverd, replace with the assembly of parts as shown below.
(a) Single-unit replacement parts for circuit board of indoor unit. (Peripheral electric parts for circuit board.)
Indoor unit printed circuit board, thermistor (return, heat exchanger), operating switches, limit switches, transformers, fuses.
Note (1) Use normal inspection methods to determine the condition of strong electrical circuits and frozen cycle parts.
(b) Replacement procedure of indoor unit microcomputer printed circuit board
Microcomputer printed circuit board can be replaced with following procedure.
(i) Confirm the parts numbers. (Refer to the following parts layout drawing for the location of parts number.)
PJA505A122ZD
PJA505A122ZC
PJA505A128ZF
Parts number
FDTA 151~401
FDTA 501, 601
FDE
Model
FDKA 151~251
FDKA 301
FDUR
Model
PHA505A018ZF
PHA505A018ZG
PJA505A131ZC
Parts number

-
8
-
CNM3
52X6 52X1 52X2 52X3
52X4
52X8-2
PC3
IC2
C2
X1
CNE
F2 F1
Z2D Z3D Z4D Z5D
R16
ZD1
CNJ
D2
IC7
TVS1
CNM2
CNW8
CNT
IC9
J8
1234
J10 J11 J12
CNR
IC12
CNG
LED2 LED1
CNW9
C13
PC5
C12
C1
L1
C58
IC3
C4
C3
CNY CNI
CNH CNN1
SW2
SW10 SW5
1234
SW7
J5 J6 J7 J8
SW8
J1 J2 J3 J4
SW9
IC11
IC8
CNB
C11
C41
KN1
CNV
52X7
52X8-1
CNW7
TM1
PC2 PC1
R17
C23
L2
ON
ON
C5
Fan motor
(501, 601)
Power supply PCB
(CNW8)
Connector
(CNT)
Address switch
(SW2)
Heat exchanger thermistor,
Return air thermistor
(Thi-R1, Thi-A)
Heat exchanger
thermistor
(Thi-R2)
J9~J11
(SW10)
DIP switch
(SW5)
J5~J6
(SW8)
DIP switch
(SW9)
J1~J4
(SW7)
Remote
controller
Louver motor
To power supply
(CNW7)
To power supply PCB
(501, 601) (CNW9)
Fan motor
(151~401)
Parts layout on the indoor unit PCB
Model: FDT series
Input signal - Reverse invalid
Input signal - Rus stop
Heating thermostat OFF-Lo
Heating thermostat OFF-Stop, Lo
Normal operation operable
Operation permission prohibited
Normal
Heating temp. +3
Louver free stop control - Invalid
Louver free stop control - Effective
Freeze prevention fan control activated.
Freeze prevention fan control deactivated.
J1 (SW7-1)
J2 (SW7-2)
J3 (SW7-3)
J4 (SW7-4)
J5 (SW8-1)
J6 (SW8-2)
With
None
(1)
With
None
(1)
With
None
(1)
With
None
(1)
With
None
(1)
With
None
(1)
Name Function
Note (1)
(2)
“None”means that jumper wire is not provided on the PCB or the
connection is cut
The replacement board is not equipped with jumpers J1 ~ J6. Instead,
SW7 and 8, with the same functions as jumpers J1~J6, are used in the
position where the jumpers were previously. Set SW7 and 8 locally in
accordance with the above table.
Note (1) It is normally ON only in the case of SW9-4.
Setting time : 1000hrs. (Unit stop)
Setting time : 1000hrs. (Display)
Setting time : 600hrs. (Display)
Setting time : 180hrs. (when shipped from factory)
SW5-4SW5-3 ON
OFF
ON
OFF
ON
OFF
Switch Function
Emergency operation
Normal
Fan control : Powerful mode
Fan control : Mild mode
SW9-3
SW9-4
SW10-1 (J9)
Switch Function
Auto swing fanction - None
Auto swing function - With
Remote controller air flow –
Remote controller air flow 1 speed
Remote controller air flow 2 speed
Remote controller air flow 3 speed
SW10-3
(J11)
SW10-2
(J10)
OFF
ON
OFF
ON
OFF
ON
OFF
ON
ON
OFF
ON
OFF
Switch Function
●Control change switch (SW5, SW9, SW10)
Function of DIP switch SW5 (Usually all turned OFF)
Function of DIP switch SW9 (Usually all turned OFF)
●Change by the jumper wire
Function of DIP switch SW10 (Usually all turned OFF)

-
9
-
CNW1
CNJ2CNM3CNRCNV
LED1 LED2
CNB CNW2
KN1
52X5
52X352X252X252X652X4
52X8-2
52X8-1
52X7
L3
F1
ZNR
CNW0 CNM1
L2
L1
C57
CNQ CNT CNH CNN1
SW2 SW5
CNE
SW8
SW7SW9SW10
IC8IC7
PCB power supply connector
(Primary side)
PCB power supply
connector
Heat exchanger thermistor,
Return air thermistor
(Thl-R1, Thl-A)
DIP switch
(SW5)
J5, J6
(SW8)
J1~J4
(SW7)
DIP switch
(SW9)
J9~J11
(SW10)
Address switch
(SW2)
Connector
(CNT)
Heat exchanger thermistor
(Thl-R2)
Remote controller
(Secondary side)
Power supply
Fan motor
Model: FDEN series
Input signal - Reverse invalid
Input signal - Rus stop
Heating thermostat OFF-Lo
Heating thermostat OFF-Stop, Lo
Normal operation operable
Operation permission prohibited
Normal
Heating temp. +3
Louver free stop control - Invalid
Louver free stop control - Effective
Freeze prevention fan control activated.
Freeze prevention fan control deactivated.
J1 (SW7-1)
J2 (SW7-2)
J3 (SW7-3)
J4 (SW7-4)
J5 (SW8-1)
J6 (SW8-2)
With
None
(1)
With
None
(1)
With
None
(1)
With
None
(1)
With
None
(1)
With
None
(1)
Name Function
Note (1)
(2)
“None”means that jumper wire is not provided on the PCB or the
connection is cut
The replacement board is not equipped with jumpers J1 ~ J6. Instead,
SW7 and 8, with the same functions as jumpers J1~J6, are used in the
position where the jumpers were previously. Set SW7 and 8 locally in
accordance with the above table.
Setting time : 1000hrs. (Unit stop)
Setting time : 1000hrs. (Display)
Setting time : 600hrs. (Display)
Setting time : 180hrs. (when shipped from factory)
SW5-4SW5-3 ON
OFF
ON
OFF
ON
OFF
Switch Function
Emergency operation
Normal
Fan control : Powerful mode
Fan control : Mild mode
SW9-3
SW9-4
SW10-1 (J9)
Switch Function
Auto swing fanction - None
Auto swing function - With
Remote controller air flow –
Remote controller air flow 1 speed
Remote controller air flow 2 speed
Remote controller air flow 3 speed
OFF
ON
OFF
ON
OFF
ON
OFF
ON
ON
OFF
ON
OFF
Switch Function
Note (1) It is normally ON only in the case of SW9-4.
SW10-3
(J11)
SW10-2
(J10)
●Control change switch (SW5, SW9, SW10)
Function of DIP switch SW5 (Usually all turned OFF)
Function of DIP switch SW9 (Usually all turned OFF)
●Change by the jumper wire
Function of DIP switch SW10 (Usually all turned OFF)

-
10
-
Heat exchanger thermistor
(Thl-R2)
Remote controller
PCB power supply
connector
(Primary side)
PCB power supply
connector
(Secondary side)
Fan motorConnector
(CNT)
Louver motor
J31
CNZ
SW10 SW5
SW9
SW7
SW8
SW2
J9
J10 J11
J5 J6 J7 J8
J1 J2 J3 J4
CNE
IC9 IC10
LED1
CNL
C92
CNG
CNY CNJ
CNT
IC8
R62
BZ
L4
C2
CNM
C104
R151
CNW1
IC11
L1 L2
CNH
CNN1
CNB
TB,3
TB,2
TB,1
G
R17
R16
J31
Dip switch
(SW5)
Adress switch
(SW2)
Dip switch
(SW9)
J9~J11
(SW10)
J5~J8
(SW8)
J1~J4(SW7)
Heat exchanger thermistor,
Return air thermistor
(Thl-R1, Thl-A)
Model: FDKN series
This diagram shows the PCB for the 151~251. The component layout on the 301 PCB is different, but the functions are the
same.
Input signal - Reverse invalid
Input signal - Rus stop
Heating thermostat OFF-Lo
Heating thermostat OFF-Stop, Lo
Normal operation operable
Operation permission prohibited
Normal
Heating temp. +3
Louver free stop control - Invalid
Louver free stop control - Effective
Freeze prevention fan control activated.
Freeze prevention fan control deactivated.
Model 151~251
Model 301
J1 (SW7-1)
J2 (SW7-2)
J3 (SW7-3)
J4 (SW7-4)
J5 (SW8-1)
J6 (SW8-2)
J8 (SW8-4)
With
None
(1)
With
None
(1)
With
None
(1)
With
None
(1)
With
None
(1)
With
None
(1)
With
None
(1)
Name Function
Note (1)
(2)
“None”means that jumper wire is not provided on the PCB or the
connection is cut
The replacement board is not equipped with jumpers J1 ~ J8. Instead,
SW7 and 8, with the same functions as jumpers J1~J8, are used in the
position where the jumpers were previously. Set SW7 and 8 locally in
accordance with the above table.
Setting time : 1000hrs. (Unit stop)
Setting time : 1000hrs. (Display)
Setting time : 600hrs. (Display)
Setting time : 180hrs. (when shipped from factory)
SW5-4SW5-3 ON
OFF
ON
OFF
ON
OFF
Switch Function
Custom code - Change
Custom code - Normal
Power failure security - Effective
Power failure security - Invalid
Emergency operation
Normal
Fan control : Powerful mode
Fan control : Mild mode
SW9-1
SW9-2
SW9-3
SW9-4
SW10-1 (J9)
Switch Function
Auto swing fanction - None
Auto swing function - With
Remote controller air flow –
Remote controller air flow 1 speed
Remote controller air flow 2 speed
Remote controller air flow 3 speed
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
ON
OFF
ON
OFF
Switch Function
OFF
ON
Note (1) It is normally ON only in the case of SW9-4.
SW10-3
(J11)
SW10-2
(J10)
●Control change switch (SW5, SW9, SW10)
Function of DIP switch SW5 (Usually all turned OFF)
Function of DIP switch SW9 (Usually all turned OFF)
●Change by the jumper wire
Function of DIP switch SW10 (Usually all turned OFF)

-
11
-
CNT CNV
CNO
CNH
CNF
CNB CNQ
CNN1 CNN2
SW2 SW10
SW5 SW7
SW9SW8 CNZ CNI
CNO
CNA
F3
F2
CNK2CNK1
CNW2
CNG
CNE
CNW0
CNW1 CNM3
52X3
52X5 52X4
52X2 52X1 52X6
L3L2
L1
L4
CNJ2 CNR
F1
LED1
LED2
PCB power supply connector
(Primary side)
PCB power supply connector
(Secondary side)
Heat exchanger thermistor
(Thl-R2)
Address swith
(SW2)
DIP switch
(SW5)
DIP switch
(SW9)
J6
(SW8)
J1~J4
(SW7)
Float switch
J10~J11
(SW10)
Connector
(CNT)
Drain motor
Remote controller
Power supply
Heat exchanger thermistor,
Return air thermistor
(Thl-R1, Thl-A)
Input signal - Reverse invalid
Input signal - Rus stop
Heating thermostat OFF-Lo
Heating thermostat OFF-Stop, Lo
Normal operation operable
Operation permission prohibited
Normal
Heating temp. +3
Freeze prevention fan control activated
Freeze prevention fan control deactivated
J1 (SW7-1)
J2 (SW7-2)
J3 (SW7-3)
J4 (SW7-4)
J6 (SW8-2)
With
None (1)
With
None (1)
With
None (1)
With
None (1)
With
None (1)
Name Function
Note (1)
(2)
“None”means that jumper wire is not provided on the PCB or the
connection is cut
The replacement board is not equipped with jumpers J1 ~ J4, J6.
Instead, SW7 and 8, with the same functions as jumpers J1~J4, J6, are
used in the position where the jumpers were previously. Set SW7 and 8
locally in accordance with the above table.
Setting time : 1000hrs. (Unit stop)
Setting time : 1000hrs. (Display)
Setting time : 600hrs. (Display)
Setting time : 180hrs. (when shipped from factory)
SW5-4SW5-3 ON
OFF
ON
OFF
ON
OFF
Switch Function
Emergency operation
Normal
Fan control : High speed (High Ceiling)
Fan control : Standard
SW9-3
SW9-4
Switch Function
Remote controller air flow –
Remote controller air flow 1 speed
Remote controller air flow 2 speed
Remote controller air flow 3 speed
OFF
ON
OFF
ON
ON
OFF
ON
OFF
Switch Function
OFF
ON
SW10-3
(J11)
SW10-2
(J10)
●Control change switch (SW5, SW9, SW10)
Function of DIP switch SW5 (Usually all turned OFF)
Function of DIP switch SW9 (Usually all turned OFF)
●Change by the jumper wire
Function of DIP switch SW10 (Usually all turned OFF)
Model: FDUR series

-
12
-
1Error display : No display
LCD display : No display [Power supply line error]
Indoor unit
Red LED
Green LED
Stays OFF
Stays OFF
Red LED
Green LED
Stays OFF
Stays OFF
Outdoor unit
YES
YES
YES
YES
YES
NO
(1)(2)
(1)(2)
NO YES
NO
YES
NO NO
NO
NO
NO
YES
Fuse
OK? Several 10K Ωor higher.
Is the voltage
between 1and 2/N of the indoor
unit’s terminal block
AC220/240V?
Is the voltage at
CNW3 or 10(1) (red –red) on the
transformer’s secondary side
14 V or higher?
Voltage between
1and 2/N of the outdoor unit’s
terminal block is
AC220/240V.
Start
Is the voltage
between CNW5 2and 3
DC 12V?
Is the voltage
between CNW8 2and 3
DC 12V?
Does it return
to normal when the power
supply is reset?
Notes (1) In models other than FDT, replace the fuse.
(2) FDT only
Note (1) In models other than FDT, it is CNW2.
Note (1) 3is GND
Control lines connected
wrong or disconnected.
Outdoor unit check
Fuse exchange
Transformer exchange
Harness disconnection
Unit is normal.
(Malfunction was due to noise, etc.)
Replacement indoor unit
power supply PCB
Replacement indoor unit
power supply PCB
Replacement indoor unit
control PCB
Disconnect the transformer’s primary side
(CNW1) and measure the resistance on
both ends of CNW1 (using a tester, etc.).
(c) Check method when the error code is display
Remote controller or Indication board: Inspection LED, error code
Indoor unit PCB: Red LED (inspection display), Green LED (CPU. normal display)
Outdoor unit PCB: ARed LED (inspection display), Green LED (CPU. normal display)
Note (1) The green LED in the outdoor unit is used in the FDCA301 ~ 601 models only.

-
13
-
Indoor unit
Green LED
Red LED 3 time flash
Keeps flashing
Outdoor unit
Green LED
Red LED Stays OFF
Keeps flashing
OK
Remote
controller wiring
connect check (Red·
White·Black)
Remote controller wire
is removed
NO
Correction
NO
Approximately
10 ~ 11 V between
X and Z.
YES
Note (1) Z is GND.
Note (2) 3is GND.
(2)
(1)
Power supply reset
Maltifunction by
accidental noise
YES
Normal?
NO
YES
Remote controller wire short circuit?
Remote controller defective
Remote controller wire
disconnection?
Remote controller defective
NO
Remeasure
between X~Z.
10~11V.
YES
YES
Is the voltage
between CNW8 1-3
12V?
NO Replacement indoor unit power
supply PCB
Replacement indoor
unit control PCB
NG
Check the
CNW5-8 harness.
OK
Only case of FDT
Harness exchange
Note (1) The green LED in the outdoor unit is used in the FDCA301 ~ 601 models only.

-
14
-
2Error display “ WAIT ”Indoor – outdoor communications trouble
(Initial (when the power is turned on)
Indoor unit
Red LED
Green LED
Stays OFF
Keeps flashing
2 time flash
Keeps flashing
Red LED
Green LED
Outdoor unit
If trouble occurs during communications, the error code E5 is displayed (Outdoor, Red LED flashes 2 times). The check procedure is as shown below. (However, excluding
connection related problems) Also, if the power supply is reset after E5 occurs, if the trouble is intermittent, it will be displayed in the LCD(“WAIT ”).
The green LED in the outdoor unit is used in the FDCA301 ~ 601 models only.
Notes (1)
(2)
YES
YES
YES
YES
DC 20V
Approx.
0V DC
Approx.
0V DC
Approx.
0V DC
Approx.
0V DC
DC 20V
NO
NO
YES
YES
YES
YES
YES
YES
NO
YES
NO
NO
NO
NO
NO
Approx. 20V DC
Approx.
0V DC
Approx. 0V DC
Approx. 20V DC
YES
YES
NO
NO
NO
YES
NO
YES
YES
YES
NO
NO
NO
(1)
(1)
YES
YES
YES YES
YES
YES
YES
DC 20V
Approx.
20V DC
NO
NO
NO
NO
NO
NO
(1)
Note (1) 1 phase is removed.
Inverter check before replacing the power supply fuse.
*
The remote controller’s LCD(“WAIT ”)
display remains unchanged after waiting 2
minutes after the power is turned on.
Is the outdoor unit controller's
power fuse F5 (20A) blown?
Is the voltage at the secondary side
of the noise filter AC220/240V?
Are the wires connecting to the
noise filter board OK?
Is the indoor unit’s green LED
flashing?
Is the outdoor unit’s control red
LED flashing 2 times?
Are the wires connecting the indoor
and outdoor units connected
according to specifications?
The remote controller’s LCD (“WAIT ”)
display remains unchanged after waiting 2
minutes after the power is turned on.
Is the outdoor green LED
flashing?
Is the indoor green LED
flashing? Is the fuse (10A) OK?
Is the voltage on the outdoor unit’s
transformer secondary side (red –
red) 14 V?
Is the outdoor red LED
flashing 2 times?
Measure the voltage between 2/N and
3of the indoor unit’s terminal block.
Are the wires connecting the indoor
and outdoor units connected according
to specifications?
Measure the voltage between 2/N and
3of the outdoor unit’s terminal block.
Measure the voltage between 2/N and
3of the outdoor unit’s terminal block.
Measure the voltage between 2/N and
3of the indoor unit’s terminal block.
Power supply
fuse exchange
Noise filter
exchange Indoor unit control
PCB defect
Indoor/outdoor unit control PCB
defect Remote controller defect
Remote controller wire
disconnection (Y)
Indoor unit control PCB
defect
Remote controller defect
Remote controller wire
disconnection (Y)
Connection wires are
faulty (disconnection)
Noise
Connection wires are
faulty (disconnection)
Noise
Connects
corrently
Repair the wires
connecting the indoor
and outdoor units.
Outdoor unit
control PCB
defect
Outdoor unit
control PCB
defect
Fuse
exchange
Transformer
defect
Outdoor unit
control PCB defect
Is the noise filter out of
phase or short circuited? Is the indoor green LED
flashing?
Is the fuse on the indoor unit
control PCB OK?
Is the outdoor red LED
flashing 2 times?
Are the wires connecting the indoor
and outdoor units connected according
to specifications?
Measure the voltage between 2/N
and 3of the outdoor unit’s
terminal block.
Measure the voltage between 2/N
and 3of the indoor unit’s
terminal block.
Is the voltage on the outdoor
unit’s transformer secondary
side (red –red) AC15V?
Is the voltage between the red and
black wires in the remote
controller DC10~11V when the
remote controller is disconnected?
Remote controller does not display
after the power is turned on.
Are there any cracks or burnouts in
the power module or diode stack?
Is the reactor abnormal?
Nois filter
exchange
Fuse
exchange
Transformer
defect
The remote
controller
wires are
short
circuited.
Repair the
connection
lines.
Remote
controller
defect
Outdoor unit control
PCB defect
Connection wires are
faulty (disconnection)
Noise
The indoor/outdoor
control board is faulty.
The remote controller
is faulty.
The X or Z lines in the
remote controller are
disconnected.
Indoor unit
control PCB
defect
Replacement outdoor
unit control PCB
Reactor
exchange
Power supply
fuse exchange
Indoor unit control
PCB defect
Indoor unit control
PCB defect
Indoor unit control
PCB defect
Repair the wires
connecting the indoor
and outdoor units.
●151~251 ●301~601

-
15
-
3Error display : e1 [Communication error between remote controller~Indoor unit]
Indoor unit
Red LED
Green LED
Stays OFF
Keeps flashing
Stays OFF
Keeps flashing
Red LED
Green LED
Outdoor unit
Voltage
between X and Z
approximately
10~11 V?
YES
NO
Replacement remote
controller
Voltage
fluctuates between
5~11 V between
Y and Z.
Is the
resistance between
Y~Z on the remote controller
approximately
10kΩ?
NO
YES
YES
YES
YES
Voltage
fluctuates between
5~10 V between
Y and Z
indoors.
NO Remote controller
wire disconnection
Voltage
fluctuates between
5~10 V between
CNB Y and Z.
❇After the green LED lights up once,
it begins flashing again continuously.
The louver moves once in the
close direction.
NO Terminal block CNB
harness is defective.
Indoor unit
resets every
4 minutes.
Resistance is
approximately 10kΩ
between indoor
Y~Z.
NO
YES
Noise
Replacement indoor
unit control PCB
Power supply reset
Normal?
Normal?
NO
NO Replacement
remote controller
NO
YES
Replacement indoor
unit control PCB
Remote controller
wire short circuit
YES
NO
Replacement remote
controller
Noise?Power supply reset
Power supply OFF
Remote controller
wire is removed
YES
❇
Indoor unit
Red LED
Green LED
Stays OFF
Stays OFF or Lights
continuously
Stays OFF
Keeps flashing
Red LED
Green LED
Outdoor unit
YES
NO
YES
YES
NO
NO
NO
YES
Power supply
reset
Check the CNW5-
CNW8 harness.
Replacement indoor
unit control PCB Is it normalized?
Disconnection ?
Replacement indoor unit
power supply PCB
Harness
exchange
Transformer
exchange
Is the
voltage at the transfomer's
secondary side (red-red) 15V
or higher?
(Runaway of indoor
unit CPU due to
noise, etc.
Transient trouble)
Unit is normal.
YES
NO
Defective indoor unit control PCB
Replace. (Defective CPU)
Is the voltage
between CNW8
2-312V?
Normal
The unit is normal.
(The malfunction is due to noise, etc.)
Power supply reset
Lighting
Stays OFF
●Only case of FDT
●Cases of other than FDT
Note (1) The green LED in the outdoor unit is used in the FDCA301 ~ 601 models only.
Note (1) The green LED in the outdoor unit is used in the FDCA301 ~ 601 models only.

-
16
-
4Error display : e6 [Defective indoor unit heat exchanger thermistor]
5Error display : e7 [Detective return air thermistor]
Indoor unit
Red LED
Green LED
1 time flash
Keeps flashing
Red LED
Green LED
Stays OFF
Keeps flashing
Outdoor unit
Indoor unit
Red LED
Green LED
1 time flash
Keeps flashing
Red LED
Green LED
Stays OFF
Keeps flashing
Outdoor unit
15
10
5
010 304020 50
5kΩat 25˚C
Temperature (˚C)
Note (1) 22.5 kΩat -6˚C
Return air thermistor (Th
I- A)
Indoor unit heat exchanger thermistor
(Th I- R1, R2)
Resistance temperature characteristics
Resistance (kΩ)
YES
YES
NO
NO
Is the indoor
unit heat exchanger
thermistor connector
connection OK?
Correction
Are characteristics
of indoor unit heat
exchanger thermistor OK
or is there any
broken wire?
Defective indoor unit control PCB
Replace-ment (Defective indoor unit
heat exchanger thermistor input circuit)
Defective indoor unit heat exchanger
thermistor Replacement
YES YES
NO
NO
Is the return air
thermistor connector
connection OK?
Correction
Is the return air
thermistor characteristics
OK or is there a
broken wire?
Defective return air
thermistor Replacement
Defective indoor unit control PCB
Replacement (Defective return air
thermistor input circuit)
Note (1) Characteristics as per the above
graph.
●Display condition
If a temperature of –50ºC or lower is detected continuously for 5 seconds or longer by the thermistor, the compres-
sor stops. After a 3 minute delay, the compressor restarts. If this state is detected again within 60 minutes after the
first detection.
●Display condition
If a temperature of –50ºC or lower is detected continuously for 5 seconds or longer by the thermistor, the compres-
sor stops. After a 3 minute delay, the compressor restarts. If this state is detected again within 60 minutes after the
first detection.
Note (1) The green LED in the outdoor unit is used in the FDCA301 ~ 601 models only.
Note (1) The green LED in the outdoor unit is used in the FDCA301 ~ 601 models only.

-
17
-
7Error display : e9 [Drain trouble]
Indoor unit
Red LED
Green LED
1 time flash
Keeps flashing
Red LED
Green LED
Stays OFF
Keeps flashing
Outdoor unit
Correction
Replacement indoor
unit control PCB
Replacement indoor
unit PCB
YES
NO
NO
NO
NO
Is there any
overflow?
DM
operation
DC 12 V
at both terminals
of CNI?
YES
NO
Abnormal data check
in remote controller
Drain motor ON from
remote controller.
YES
YES
Is drain
piping unclogged?
Is the slop OK?
AC 220/240 V
at both terminals
of CNR?
YES
DM check of
motor wiring
Float switch check
DM check
6Error display : e8 [Heating overload]
Indoor unit
Red LED
Green LED
1 time flash
Keeps flashing
Red LED
Green LED
Stays OFF
Keeps flashing
Outdoor unit
YES
Is the air filter clogged?
NO
YES
Are the connections to
the indoor heat exchanger thermistor
OK?
Are the characteristics of
the indoor heat exchanger thermistor
OK?
Does the heating
overload state exist?
NO
YES
NO
NO
YES
Notes (1) Check if the overload state exists or not using the following check points.
Is there a short circuit?
Is the indoor heat exchanger dirty or clogged?
Is the outdoor unit’s fan control normal?
Is the indoor or outdoor air temperature too high?
(2) See the figure page 142 for indoor heat exchanger thermistor characteristics.
(( ((
Heating is
possible.
Abnormal stop
56 63
Indoor unit heat exchanger temp. (˚C)
Check the remote controller for abnormal data.
Clean it.
Defective indoor unit heat
exchanger thermistor
Replacement
Repair
Check the cooling system.
Adjust
●Display condition
An abnormal stop occurs if this state is detected 5 times within 60 minutes of the
first detection, or if the overload state is detected continuously for 6 minutes.
●Abnormal Temperature Detection
Note (1) The green LED in the outdoor unit is used in the FDCA301 ~ 601 models only.
Note (1) The green LED in the outdoor unit is used in the FDCA301 ~ 601 models only.

-
18
-
8Error display : e10 [Control of 1 remote controller VS multiple units
Excessive number of units (more than 17 units) ]
Indoor unit
Red LED
Green LED
Stays OFF
Keeps flashing
Red LED
Green LED
Stays OFF
Keeps flashing
Outdoor unit
Are more
than 17 units connected
to a remote
controller?
Reduce to 16 units
or less
YES
NO
Defective indoor unit control PCB
Replacement
NO
NO
Abnormal data check
with remote controller
After check reset,
fan runs on weak.
Check the
circumstances.
Was it reproduced?
Fan ON?
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES YES
YES
DC 15V
between CNW9- 3 and
CNM2 4 ?
When the
motor is turning, does
the voltage at CNM2 2
fluctuate between
0 ~ 15 V?
Secondary
side of transformer
(red-red) 15V
or more
Does the
fan motor turn
smoothly by
hand?
Is the voltage
at CNM2 3 DC 1V
or higher?
CNM1
1 and 3 (Red –White)
DC280V?
CNW9
1 and 3
DC15V?
Replacement indoor
unit power supply PCB
Replacement indoor
unit control PCB
Replacement indoor
unit control PCB
Detective fan motor
Replacement indoor
unit control PCB
Replacement transformer
Note (1) CNW9- 3 is GND.
White is GND.
3 is GND.
(1)
(2)
Note (2) CNW9- 3 is GND.
9Error display : e16
Indoor unit
Red LED
Green LED
Stays OFF
Keeps flashing
Red LED
Green LED
Stays OFF
Keeps flashing
Outdoor unit
SOnly case of FDTA501, 601 types
●Display conditions
If an indoor unit fan motor’s speed is detected to be less than
200 rpm continuously for 30 seconds, the fan motor stops for 2
seconds. After 2 seconds, it starts again, but this occurs 4 times
within a period of 1 hour.
Note (1) The green LED in the outdoor unit is used in the FDCA301 ~ 601 models only.
Note (1) The green LED in the outdoor unit is used in the FDCA301 ~ 601 models only.
[Fan motor abnormalities]