Fujitsu WATERSTAGE WS A050DD6 Series Technical manual

04/03/2013
Air to water heat pump
Split System (single phase type)
Hydraulic unit
WS *A050DD6
WS *A100DD6
WG *A050DD6
WG *A100DD6
Outdoor unit
WO *A060LDC
WO *A080LDC
WO *A100LDT
Document 1589-3 ~ 04/03/2013
Maintenance
Document
Intended for
professional use
Fujitsu General (Euro) GmbH
Werftstrasse 20
40549 Düsseldorf - Germany
Subject to change without notice
Non contractual document
FR
EN

Contents
1 Control and test ..............................................................................................................4
1.1 Control of Electric Backups....................4 1.2 Sensor and Input Test Mode.................4
2 Faults...............................................................................................................................5
2.1 Fault List................................................5
2.1.1 Hydraulic Unit Fault ......................................5
2.1.2 Outdoor Unit Fault ........................................7
2.2 Outdoor Unit Clearing............................8
2.2.1 Failures with Error Code...............................8
2.2.2 Failures With No Error Code.......................27
2.3 Sensor Values .....................................31
2.3.1 Outdoor Unit Temperature Sensors ...........31
2.3.2 Hydraulic Unit Temperature Sensors .........31
2.4 Service parts information .....................32
2.4.1 Service parts information 1 : Compressor..32
2.4.2 Service parts information 2 : Inverter
compressor .................................................33
2.4.3 Service parts information 3 : Outdoor unit
electronic expansion valve (EEV)................34
2.4.4 Service parts information 4 : Outdoor unit
solenoid valve (SV)......................................35
2.4.5 Service parts information 5 : Outdoor unit fan
motor............................................................35
2.4.6 Service parts information 6 : Active filter
module (Only for WO*A080LDC and
WO*A100LDT models)................................36
2.4.7 Service parts information 7 : IPM (mounted
on Transistor PCB, Only for WO*A080LDC
and WO*A100LDT models).........................37
2.5 Operating Limits.................................. 38
3 Failures..........................................................................................................................39
3.1 Hydraulic, Electric and Refrigeration
Systems...............................................39
3.1.1 Hydraulic System........................................39
3.1.2 Electrical System ........................................ 40
3.1.3 Refrigeration System..................................41
3.2 Compressor Operating Checks........... 43
3.3 Refrigeration Circuit Leak Test............ 43
3.4 Troubleshooting .................................. 43
4 Control Settings............................................................................................................44
4.1 General................................................44
4.2 Function Table.....................................45
4.3 Adjustment Function Details ................51
4.3.1 Date and Time Functions............................51
4.3.2 User Interface Functions.............................51
4.3.3 Time Program Functions (heating circuit 1 &
2, DHW, cooling).........................................52
4.3.4 Heating Circuit 1 & 2 Functions..................53
4.3.5 Cooling Circuit 1 Functions.........................60
4.3.6 DHW Functions (with DHW kit or with
integrated DHW models).............................66
4.3.7 Swimming Pool Functions ..........................69
4.3.8 Heat Pump Functions..................................69
4.3.9 Supplementary source ................................71
4.3.10 DHW Tank Functions (with DHW kit or with
integrated DHW models).............................73
4.3.11 Configuration Functions..........................75
4.3.12 Error Functions .......................................77
4.3.13 Maintenance / Special Operating Mode
Functions.................................................79
4.3.14 Input / Output Testing Functions.............81
4.3.15 Status Functions .....................................82
4.3.16 Generator Diagnosis Functions ..............87
4.3.17 Consumer Diagnosis Functions..............88
5 Maintenance services...................................................................................................91
5.1 Hydraulic checks..................................91
5.2 Maintenance of the DHW tank
(Integrated DHW models).....................91
5.2.1 Emptying the hot water tank.......................91
5.2.2 Descaling.....................................................91
5.3 Checking the outdoor unit.................... 91
5.4 Electrical checks ................................. 91
6 Maintenance (integrated DHW models........................................................................92
6.1 Emptying the hydraulic unit..................92
6.2 Distribution valve .................................92
6.3 ACI check............................................ 92

Split system single phase type
Maintenance Document 1589-3 3
7 Disassembly Process of Outdoor Unit .......................................................................93
7.1 WO*A060LDC and WO*A080LDC.......93
7.1.1 Appearance ................................................ 93
7.1.2 TOP PANEL removal.................................. 93
7.1.3 FRONT PANEL removal............................. 94
7.1.4 VALVE COVER removal ............................ 94
7.1.5 MAIN PCB, TRANSISTOR PCB, and ACTPM
removal ....................................................... 94
7.1.6 FAN MOTOR removal ................................97
7.1.7 CABINET RIGHT ASSY removal ...............97
7.1.8 THERMISTOR removal.............................. 98
7.1.9 SOLENOID COIL removal.......................... 99
7.1.10 EEV COIL removal................................. 99
7.1.11 PRESSURE SENSOR removal ............. 99
7.1.12 COMPRESSOR removal...................... 100
7.2 WO*A100LDT ...................................102
7.2.1 Appearance .............................................. 102
7.2.2 SERVICE PANEL removal........................102
7.2.3 TOP PANEL removal ................................102
7.2.4 VALVE COVER removal...........................103
7.2.5 MAIN PCB and POWER PCB removal.....103
7.2.6 TRANSISTOR PCB and ACTPM PCB
removal......................................................104
7.2.7 FAN MOTOR removal...............................105
7.2.8 RIGHT PANEL removal ............................105
7.2.9 THERMISTOR removal.............................106
7.2.10 SOLENOID COIL removal....................107
7.2.11 EEV COIL removal................................107
7.2.12 PRESSURE SENSOR removal............107
7.2.13 COMPRESSOR removal......................108
7.3 Precautions for exchange of refrigerant-
cycle-parts.........................................110

Split system single phase type
4
Maintenance Document 1589-3
1 Control and test
1.1 Control of Electric Backups
H 3
3
EX
1
EX
2
EX
3
Outdoor
Unit Fault Load-shedding (EJP) Off-peak/peak hours External fault
(369)
(370)
0 V
230 V
230 V
0 V
230 V
0 V
230 V
EJP
lock signal
(l 2920)
"released"
" locked "
HEAT PUMP
OFF ON ON OFF ON ON ON OFF
DHW
auxiliary
ON (1) ON OFF OFF ON OFF ON OFF
1
st
s
tage
el
ec
. auxiliary
ON (2) ON OFF OFF ON ON ON OFF
2
nd
s
tage
el
ec
. auxiliary
ON (2) ON OFF OFF ON ON ON OFF
Boiler backup
ON (2) ON ON ON ON ON ON OFF
(1) subject to authorization by EX2
(2) provided the outdoor temperature is less than the setting on "2884 or 3700" (+2° from the beginning)
1.2 Sensor and Input Test Mode
LINE
SENSOR
INPUT
OUTPUT
WATERSTAGE
7700 QX Relay test
7710 UX1 Output test
7712 UX1 PWM-Signal
7722 DO2 Cooling mode
7723 D3 Heat pump
7724 UX3 Output test ("Inverter" command)
7725 UX3 Voltage signal (Ux3)
7820 BX1 Sensor temp (HP flow temperature)
7821 BX2 Sensor temp (HP return temperature)
7822 BX3 Sensor temp (DHW temperature)
7823 BX4 Sensor temp (Outside temperature)
7911 EX1 Input (Power shedding, EJP)
7912 EX2 Input (Tariffs day/night)
7913 EX3 Input (External fault)
7973 BX31 Sensor temp (Mixing circuit temp.)
7976 BX34 Sensor temp (Swimming pool exchanger temperature)
7996 H33 Contact state

Split system single phase type
Maintenance Document 1589-3 5
2 Faults
2.1 Fault List
2.1.1 Hydraulic Unit Fault
Faults which occur on the Hydraulic Unit are shown
by the symbol . Press the info key for details on the
cause of the fault. The following information is
displayed :
•Description of the error
•Location of the error (sensor or contact)
•Reset. Depending on its type, the fault can be
manually or automatically deleted:
Manual delete: the text displayed when pressing
the info key shows "reset ?". Press OK once, the
yes flashes; press again to confirm deletion of the
fault.
Faults whose deletion is automatic are
automatically reset.
•Heat pump op: shows whether or not the heat pump
operates despite the fault.
No.: Designation of error
Location
(connection)
Reset
HP op
Manua
l
Auto
10: Outdoor sensor X86 No No Yes
33: Flow sensor HP X70 No No Yes
44: Return sensor HP X70 No No Yes
50: DHW sensor 1 X84 No No Yes
60: Room sensor 1 No No Yes
65: Room sensor 2 No No Yes
105: Maintenance message No No Yes
121: Flow temp HC1 (too low) No No Yes
122: Flow temp HC2 (too low) No No Yes
127: Legionella temp No No Yes
369: External fault (safety component) No
370: Thermodynamic source* No No No
No connection the polarity of the room sensor is not
respected. - - No
* A fault in the outdoor unit is indicated by LED located on the Hydraulic Unit interface board.
LED display
Fault description Clear
LED 2 (green) LED 1(red)
1 Flash 1 Flash Communication error between Hydraulic Unit and Outdoor unit. 1, 2
4 Flashes 1 Flash Heat pump capacity signal error (Open or short). 4
4 Flashes 2 Flashes Hydraulic Unit heat-exchange thermistor Error. 5
6 Flashes 4 Flashes Active filter error. 21
6 Flashes 4 Flashes PFC error 21
7 Flashes 1 Flash Discharge thermistor error. 7
7 Flashes 2 Flashes Compressor thermistor error. 11
7 Flashes 3 Flashes Heat-exchange thermistor (outlet) error. 8
7 Flashes 4 Flashes Outdoor thermistor error. 9
7 Flashes 8 Flashes Expansion valve thermistor error. 14
8 Flashes 4 Flashes Current sensor error. 16
8 Flashes 6 Flashes Pressure sensor error. 24
9 Flashes 4 Flashes Current trip. 15
9 Flashes 5 Flashes Detection of compressor position error.
Compressor start up error. 17
9 Flashes 7 Flashes Outdoor unit fan motor error. 18
10 Flashes 1 Flash Discharge temperature protection. 22
10 Flashes 3 Flashes Compressor temperature protection. 25
10 Flashes 5 Flashes Low pressure abnormal. 26
Continuous flashing
(1 sec ON / 1 sec OFF) Pump down operation.
ON OFF During defrost
OFF OFF Normal operation / Operation stops

Split system single phase type
6
Maintenance Document 1589-3
Faults external to the heat pump
Any safety device (e.g. thermostat pressure switch)
wired to input Ex3 (E20) allows external problems to
be reported and the heat pump to be immediately
stopped. For example, a safety thermostat on the
heating floor can be wired to input Ex3 (E20) to avoid
excessively high temperatures in the floor.
Figure 2: Typical Wiring of External Devices
Figure 1: Location of DIP switches and diodes
on the hydraulic unit interface card

Split system single phase type
Maintenance Document 1589-3 7
2.1.2 Outdoor Unit Fault
When the system is switched back on after a power
outage, the Hydraulic Unit may display fault 370 for a
few tens of seconds. This is not a serious problem. It
simply means that the outdoor unit is running its
tests. Once the tests have been completed, the fault
should disappear.
Faults are coded by LED located on the hydraulic unit
interface board (see page 5)

Split system single phase type
8
Maintenance Document 1589-3
2.2 Outdoor Unit Clearing
This section describes the techniques which can be used to identify the failure.
2.2.1 Failures with Error Code
Clear 1: Serial reverse transfer error (AO*A060LDC)
Hydraulic Unit LED: Green 1 flash / Red 1 flash
Outdoor Unit LED: Off
Probable causes:
•Misconnection.
•External cause.
•Main PCB failure.
•Outdoor unit Fan motor failure.
Check:
1
-
1. Stop the system and start it again (disconnection time 1min):
Is the error still displayed?
YES NO
3. Check the power supply voltage:
- Check that an AC 198 – 264 V voltage exists between terminals N and L
on the outdoor unit terminal block.
OK
4. Check the serial signal:
- Check the voltage between terminals 1 and 3 of the outdoor terminal block. The
voltage must fluctuate between AC 70 V and AC 130 V.
- 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.
OK
1
-
2. Check for external causes:
- Check the system's overall isolation.
- Check for any equipment generating harmonic
waves which interfere with the communication
between the hydraulic unit and the outdoor unit.
(Neon light bulb or any electric equipment which
causes harmonic waves).
2. Check the conne
ctions:
- Check the connection between the hydraulic
unit and the outdoor unit.
- If there is an abnormal condition, correct it
by referring to Installation manual.

Split system single phase type
Maintenance Document 1589-3 9
Clear 1: Serial reverse transfer error (AO*A080LDC, AO*A100LDT)
Hydraulic Unit LED: Green 1 flash / Red 1 flash
Outdoor Unit LED: Off
Probable causes:
•Misconnection.
•External cause.
•Main PCB failure.
•Active filter module failure.
•Transistor PCB (IPM) failure.
•Filter PCB failure.
•Outdoor unit Fan motor failure.
Check:
1
-
1. Stop the system and start it again (disc
onnection time 1min):
Is the error still displayed?
YES NO
3. Check the power supply voltage:
- Check that an AC 198 – 264 V voltage exists between terminals N and L
on the outdoor unit terminal block.
OK
4. Check the serial signal:
- Check the voltage between terminals 1 and 3 of the outdoor terminal block. The
voltage must fluctuate between AC 70 V and AC 130 V.
- It it is abnormal, check the parts as follows :
- Outdoor unit fan motor (Parts information 5)
- Active filter module (Parts information 6)
- 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.
OK
1
-
2. Check for external causes:
- Check the system's overall isolation.
- Check for any equipment generating harmonic
waves which interfere with the communication
between the hydraulic unit and the outdoor unit.
(Neon light bulb or any electric equipment which
causes harmonic waves).
2. Check the connections:
- Check the connection between the hydraulic
unit and the outdoor unit.
- If there is an abnormal condition, correct it
by referring to Installation manual.
- Check the connections between the outdoor
unit main board and the active filter board.

Split system single phase type
10
Maintenance Document 1589-3
Clear 2: Serial forward transfer error
Hydraulic Unit LED: Green 1 flash / Red 1 flash
Outdoor Unit LED: flash
Probable causes:
•Misconnection.
•External cause.
•Interface PCB failure.
Check:
1
-
1. Stop the system and start it again (disconnection time 1min):
Is the error still displayed?
YES NO
3. Check the power supp
ly voltage:
- Check that an AC 198 – 264 V voltage exists between terminals N and L
on the outdoor unit terminal block.
OK
4. Check the serial signal:
- Check the voltage between terminals 2 and 3 of the outdoor terminal block. The
voltage must fluctuate between AC 70 V and AC 130 V.
- If it doesn't, replace Interface PCB.
OK
1
-
2. Check for external causes:
- Check the system's overall isolation.
- Check for any equipment generating harmonic
waves which interfere with the communication
between the hydraulic unit and the outdoor unit.
(Neon light bulb or any electric equipment which
causes harmonic waves).
2. Check the connections:
- Check the connection between the hydraulic
unit and the outdoor unit.
- If there is an abnormal condition, correct it
by referring to Installation manual.
- Check the connections between the outdoor
unit main board and the active filter board.

Split system single phase type
Maintenance Document 1589-3 11
Clear 4: Heat pump capacity signal error
Hydraulic Unit LED: Green 4 flashes / Red 1 flash
Outdoor Unit LED: flash
Probable causes:
•Misconnection.
•Sensor failure.
•Interface PCB failure.
Check:
1. Check connection interface PCB and Heat pump regulator PCB:
-See if the connector has been disconnected.
-See if the connection is correct.
-Check for any damage on the sensor cable.
After solving the misconnection problem, switch the heat pump back on.
2.
C
heck
resistance value
:
3 pin of CN22 – M < 10Ω
OK
3.
Replace interface PCB
:
If check point 1 and 2 do not improve the symptom, replace Interface PCB.
OK

Split system single phase type
12
Maintenance Document 1589-3
Clear 5: Hydraulic Unit Heat exchanger thermistor error
Hydraulic Unit LED: Green 4 flashes / Red 2 flashes
Outdoor Unit LED: flash
Probable causes:
•Misconnection.
•Sensor failure.
•Interface PCB failure.
Check:
1. C
heck the
sensor connection
:
-See if the connector has been removed
-See if the connection is correct
-Check for any damage on the sensor cable.
After solving the misconnection problem, switch the heat pump back on.
2. Remove the sensor and check its
resistance
value
:
- Check the resistance value.
Temperature (°C)
0 5 10 15 20 25 30 35 40 45 50
Resistance (kΩ) 176 134 103 80,3
62,9 49,7 39,6 31,7 25,6 20,8 17,1
- If the thermistor is faulty, replace it.
OK
3. Check the electronic board voltage:
- Make sure circuit diagram of hydraulic unit and check terminal voltage at thermistor
(DC5.0V)
- If there is no voltage, replace Interface PCB.
OK
Gr
ay
Gr
ay
Black

Split system single phase type
Maintenance Document 1589-3 13
Clear 7: Discharge thermistor error
Hydraulic Unit LED: Green 7 flashes / Red 1 flash
Outdoor Unit LED: flash
Probable causes:
•Misconnection.
•Sensor failure.
•Main PCB failure.
Check:
1. C
heck the sensor connection
:
-See if the connector has been disconnected.
-See if the connection is correct.
-Check for any damage on the sensor cable.
After solving the misconnection problem, switch the heat pump back on.
2. Remove the sensor and check its
resistance value
:
- Check the resistance value
Temperature (°C) 0 5 10 15 20 30 40 50
Resistance (kΩ) 169 130 101 79,1 62,6 40,0 26,3 17,8
Temperature (°C) 60 70 80 90 100 120
Resistance (kΩ) 12,3 8,7 6,3 4,6 3,4 2
- If the thermistor is faulty, replace it.
OK
3. Check the electronic board voltage:
Make sure circuit diagram of outdoor unit and check terminal voltage at thermistor (DC5.0V)
WO*A060LDC WO*A080LDC WO*A100LDT
- If there is no voltage, replace Main PCB.
OK
EXP VALVE
PIPE
DISCHARGE PIPE
OUTDOOR TEMP
COMPRESSOR
TEMP COMPRESSOR
TEMP
EXP VALVE
OUTDOOR
TEMP
DISCHARGE
PIPE
PIPE
EXP VALVE
COMPRESSOR
TEMP
OUTDOOR
TEMP
PIPE
DISCHARGE
PIPE

Split system single phase type
14
Maintenance Document 1589-3
Clear 8: Heat-exchange thermistor (outlet) error :
Hydraulic Unit LED: Green 7 flashes / Red 3 flashes
Outdoor Unit LED: flash
Probable causes:
•Misconnection.
•Sensor fault.
•Main PCB failure.
Check:
1. C
heck the sensor connection
:
-See if the connector has been disconnected.
-See if the connection is correct.
-Check for any damage on the sensor cable.
After solving the misconnection problem, switch the heat pump back on.
2. Remove the sensor and check
its resistance value
:
- Check the resistancer value
Temperature (°C) -30 -20 -10 -5 0 5 10 20 30 40 50 60 70 80
Resistance (kΩ) 95.6
50.3 27.8 21.0 16.1 12.4 9.63 5.98 3.84 2.5 1.7 1.2 0.8 0.6
- If the thermistor is faulty, replace it.
OK
OK
3. Check the electronic board voltage:
Make sure circuit diagram of outdoor unit and check terminal voltage at thermistor (DC5.0V)
WO*A060LDC WO*A080LDC WO*A100LDT
- If there is no voltage, replace Main PCB.
EXP VALVE
PIPE
DISCHARGE PIPE
OUTDOOR TEMP
COMPRESSOR
TEMP COMPRESSOR
TEMP
EXP VALVE
OUTDOOR
TEMP
DISCHARGE
PIPE
PIPE
EXP VALVE
COMPRESSOR
TEMP
OUTDOOR
TEMP
PIPE
DISCHARGE
PIPE

Split system single phase type
Maintenance Document 1589-3 15
Clear 9: Outdoor temperature thermistor error
Hydraulic Unit LED: Green 7 flashes / Red 4 flashes
Outdoor Unit LED: flash
Probable causes:
•Misconnection.
•Sensor failure.
•Main PCB failure.
Check:
1.
Check the sensor connection
:
-See if the connector has been disconnected.
-See if the connection is correct.
-Check for any damage on the sensor cable.
After solving the misconnection problem, switch the heat pump back on.
2. Remove
the sensor and check its
resistance value
:
- Check the resistance value.
Temperature (°C) -20 -10 -5 0 5 10 15 20 30 40 50 60 70
Resistance (kΩ) 115 62,3 46,6 35,2 26,9 20,7 16,1 12,6 7,97 5,18 3,45 2,36 1,65
- If the thermistor is faulty, replace it.
OK
OK
3. Check the electronic board voltage:
Make sure circuit diagram of outdoor unit and check terminal voltage at thermistor (DC5.0V)
WO*A060LDC WO*A080LDC WO*A100LDT
- If there is no voltage, replace Main PCB.
EXP VALVE
PIPE
DISCHARGE PIPE
OUTDOOR TEMP
COMPRESSOR
TEMP COMPRESSOR
TEMP
EXP VALVE
OUTDOOR
TEMP
DISCHARGE
PIPE
PIPE
EXP VALVE
COMPRESSOR
TEMP
OUTDOOR
TEMP
PIPE
DISCHARGE
PIPE

Split system single phase type
16
Maintenance Document 1589-3
Clear 11: Compressor thermistor error
Hydraulic Unit LED: Green 7 flashes / Red 2 flashes
Outdoor Unit LED: flash
Probable causes:
•Misconnection.
•Sensor failure.
•Main PCB failure.
Check:
1. C
heck the sensor connection
:
-See if the connector has been removed
-See if the connection is correct
-Check for any damage on the sensor cable.
After solving the misconnection problem, switch the heat pump back on.
2. Rem
ove the sensor and check its
resistance value
:
- Check the resistance value.
Temperature (°C) 0 5 10 15 20 30 40 50
Resistance (kΩ) 169 130 101 79.1 62.6 40.0 26,3 17,8
Temperature (°C) 60 70 80 90 100 120
Resistance (kΩ) 12,3 8,7 6,3 4,6 3,4 2
- If the thermistor is faulty, replace it.
OK
OK
3. Che
ck the electronic board voltage:
Make sure circuit diagram of outdoor unit and check terminal voltage at thermistor (DC5.0V)
WO*A060LDC WO*A080LDC WO*A100LDT
- If there is no voltage, replace Main PCB.
EXP VALVE
PIPE
DISCHARGE PIPE
OUTDOOR TEMP
COMPRESSOR
TEMP COMPRESSOR
TEMP
EXP VALVE
OUTDOOR
TEMP
DISCHARGE
PIPE
PIPE
EXP VALVE
COMPRESSOR
TEMP
OUTDOOR
TEMP
PIPE
DISCHARGE
PIPE

Split system single phase type
Maintenance Document 1589-3 17
Clear 14: Expansion valve thermistor error
Hydraulic Unit LED: Green 7 flashes / Red 8 flashes
Outdoor Unit LED: flash
Probable causes:
•Misconnection.
•Sensor failure.
•Main PCB failure.
Check:
1. C
heck the sensor connection
:
-See if the connector has been removed
-See if the connection is correct
-Check for any damage on the sensor cable.
After solving the misconnection problem, switch the heat pump back on.
2. Remove the sensor and check its
resistance value
:
- Check the resistance value.
Temperature (°C) 0 5 10 15 20 30 40 50
Resistance (kΩ) 169 130 101 79.1 62.6 40.0 26,3 17,8
Temperature (°C) 60 70 80 90 100 120
Resistance (kΩ) 12,3 8,7 6,3 4,6 3,4 2
- If the thermistor is faulty, replace it.
OK
OK
3. Check the electronic board voltage:
Make sure circuit diagram of outdoor unit and check terminal voltage at thermistor (DC5.0V)
WO*A060LDC WO*A080LDC WO*A100LDT
- If there is no voltage, replace Main PCB.
EXP VALVE
PIPE
DISCHARGE PIPE
OUTDOOR TEMP
COMPRESSOR
TEMP COMPRESSOR
TEMP
EXP VALVE
OUTDOOR
TEMP
DISCHARGE
PIPE
PIPE
EXP VALVE
COMPRESSOR
TEMP
OUTDOOR
TEMP
PIPE
DISCHARGE
PIPE

Split system single phase type
18
Maintenance Document 1589-3
Clear 15: Current trip (permanent stoppage)
Hydraulic Unit LED: Green 9 flashes / Red 4 flashes
Outdoor Unit LED: flash
Probable causes:
•Connection failure.
•Outdoor Heat Exchanger clogged.
•Outdoor Fan operation failure.
•Compressor failure.
•Main PCB failure.
•Transistor PCB (IPM) (only for WO*A080LDC, WO*A100LDT model)
Check:
1. Check connections condition in control unit
Check connections condition in control unitCheck connections condition in control unit
Check connections condition in control unit:
- Check if the terminal connection is loose.
- Check if connector is removed.
- Check if connector is erroneous connection.
- Check if cable is open.
Upon correcting the removed connector or mis
-
wiring, reset the power.
OK
3. Check Outdoor Fan
Check Outdoor FanCheck Outdoor Fan
Check Outdoor Fan:
- Check Outdoor Fan Motor. (Refer to Clear 18)
If the Fan Motor is failure, replace it.
OK
5
. Check
Main PCB
:
If checkpoint 1~4 do not improve the symptom, replace main PCB
OK
2. Check Outdoor Heat Exchanger:
- Is there any obstructing the air flow route?
- Is there any clogging of outdoor unit Heat Exchanger?
If clogged, clear the clog.
6
.
Replace compressor
:
If Check Point 1 ~ 5 do not improve the symptom, replace compressor.
OK
4. Check
Check Check
Check transistor PCB (IPM) (only for 080 and 100 model)
transistor PCB (IPM) (only for 080 and 100 model) transistor PCB (IPM) (only for 080 and 100 model)
transistor PCB (IPM) (only for 080 and 100 model) :
- Check IPM. (PARTS INFORMATION 7)
If it is abnormal, replace transistor PCB.
OK

Split system single phase type
Maintenance Document 1589-3 19
Clear 16: Current sensor error
Hydraulic Unit LED: Green 8 flashes / Red 4 flashes
Outdoor Unit LED: flash
Probable causes:
•Defective connection of electric components.
•External cause.
•Main PCB failure.
Check:
1-1. Reset power supply and operate
Reset power supply and operate Reset power supply and operate
Reset power supply and operate :
Does error indication show again ?
YES
2. Check
connections of out
door 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.
1-2. Check external cause at indoor and outdoor
Check external cause at indoor and outdoor Check external cause at indoor and outdoor
Check external cause at indoor and outdoor
(vol
(vol(vol
(voltage drop or noise)
tage drop or noise) tage drop or noise)
tage 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.
NO
3
.
Replace main PCB
:
If checkpoints 1 and 2 do not improve the symptom, change main PCB
OK

Split system single phase type
20
Maintenance Document 1589-3
Clear 17: Compressor startup error (permanent stoppage)
Defection of compressor position error
Hydraulic Unit LED: Green 9 flashes / Red 5 flashes
Outdoor Unit LED: flash
Probable causes:
•Misconnection of the various electrical components.
•Main PCB failure.
•Compressor failure.
•Transistor PCB (IPM) failure (only for 080 and 100 model)
Check:
3
. Check C
ompressor:
Refer to “Service parts information 2 : Inverter compressor
If it is abnormal, replace compressor.
4
. Replace the electronic board
:
- If steps 1~3 do not solve the problem, replace Inverter PCB.
OK
1. Check connections
Check connections Check connections
Check connections of around the compressor components
of around the compressor components of around the compressor components
of around the compressor components :
- Check if the terminal connection is loose.
- Check if connector is removed.
- Check if connector is erroneous connection.
- Check if cable is open.
Upon correcting the removed connector or mis-wiring, reset the power.
OK
2
. Check
transistor PCB (IPM
)
(only for 080 and 100 model)
:
- Check IPM (PARTS INFORMATION 7)
If IPM is abnormal, replace transistor PCB.
OK