Fujitsu Waterstage WS G140DC6 Series Technical manual

20/06/2012
Air to water heat
p
um
p
Split System (single phase type)
Hydraulic unit
WS *G140DC6
Outdoor unit
WO *G112LCT
WO *G140LCT
Split System (3-phase type)
Hydraulic unit
WS *K160DC9
Outdoor unit
WO *K112LCT
WO *K140LCT
WO *K160LCT
Document 1544-1 ~ 20/06/2012
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

20/06/2012
Contents
1Control and test ..............................................................................................................5
1.1 Control of Electric Backups ............5 1.2 Sensor and Input Test Mode..........5
2Faults ...............................................................................................................................6
2.1 Fault List.........................................6
2.1.1 Hydraulic Unit Fault..........................6
2.1.2 Outdoor Unit Fault............................8
2.2 Outdoor Unit Clearing.....................9
2.2.1 Failures with Error Code ..................9
2.2.2 Failures With No Error Code..........31
2.3 Sensor Values ..............................35
2.3.1 Outdoor Unit Temperature Sensors35
2.3.2 Hydraulic Unit Temperature Sensors35
2.4 Service parts information..............36
2.4.1 Service parts information 1 :
Compressor ................................................ 36
2.4.2 Service parts information 2 : Inverter
compressor ................................................. 37
2.4.3 Service parts information 3 : Outdoor
unit electronic expansion valve (EEV, EEV(INJ))
38
2.4.4 Service parts information 4 : Outdoor
unit solenoid valve (SV).............................. 39
2.5 Operating Limits...........................40
3Failures..........................................................................................................................41
3.1 Hydraulic, Electric and Refrigeration
Systems ...................................................41
3.1.1 Hydraulic System ...........................41
3.1.2 Electrical System ...........................42
3.1.3 Refrigeration System .....................43
3.2 Compressor Operating Checks....45
3.3 Refrigeration Circuit Leak Test ....45
3.4 Troubleshooting ...........................45
4Control Settings............................................................................................................46
4.1 General.........................................46
4.2 Function Table..............................47
4.3 Adjustment Function Details.........53
4.3.1 Date and Time Functions...............53
4.3.2 User Interface Functions................53
4.3.3 Time Program Functions (heating circuit
1 & 2, DHW, cooling) ..................................54
4.3.4 Heating Circuit 1 & 2 Functions .....55
4.3.5 Cooling Circuit 1 Functions ............62
4.3.6 DHW Functions..............................68
4.3.7 Swimming Pool Functions..............71
4.3.8 Heat Pump Functions....................71
4.3.9 Supplementary source................... 73
4.3.10 DHW Tank Functions .................... 74
4.3.11 Configuration Functions................. 76
4.3.12 Error Functions .............................. 78
4.3.13 Maintenance / Special Operating Mode
Functions .................................................... 80
4.3.14 Input / Output Testing Functions ... 82
4.3.15 Status Functions............................ 83
4.3.16 Generator Diagnosis Functions..... 88
4.3.17 Consumer Diagnosis Functions .... 89
5Annual Maintenance Services .....................................................................................92
5.1 Hydraulic Circuit ...........................92
5.2 Outdoor unit..................................92 5.3 Electrical ......................................92 5.4 Operating checks .........................92

Split system (Single phase and 3-phase type)
4 Maintenance Document 1544-1
6Disassembly Process of Outdoor Unit........................................................................93
6.1 Single phase type ........................93
6.1.1 Appearance................................... 93
6.1.2 Service panel removal................... 93
6.1.3 Top panel removal ........................ 93
6.1.4 MAIN PCB, FILTER PCB, and
INDICATOR PCB removal ......................... 94
6.1.5 FAN MOTOR removal................... 96
6.1.6 VALVE COVER removal............... 96
6.1.7 RIGHT PANEL removal ................ 97
6.1.8 THERMISTOR removal................. 97
6.1.9 SOLENOID COIL removal ............ 98
6.1.10 EEV COIL removal........................ 99
6.1.11 PRESSURE SENSOR removal .... 99
6.1.12 COMPRESSOR removal .............. 99
6.2 3-phase type ................................ 99
6.2.1 Appearance................................... 99
6.2.2 Service panel removal................... 99
6.2.3 Insulation sheet removal................99
6.2.4 Main PCB removal.........................99
6.2.5 INVERTER, PFC, FILTER, and
CAPACITOR PCB removal ........................99
6.2.6 FAN MOTOR removal ...................99
6.2.7 TOP PANEL removal.....................99
6.2.8 PIPE COVER FRONT removal .....99
6.2.9 RIGHT PANEL removal.................99
6.2.10 REACTOR removal .......................99
6.2.11 THERMISTOR removal .................99
6.2.12 SOLENOID COIL removal.............99
6.2.13 EEV COIL removal ........................99
6.2.14 PRESSURE SENSOR removal.....99
6.2.15 COMPRESSOR removal...............99
6.3 Precautions for exchange of
refrigerant-cycle-parts ............................. 99

Split system (Single phase and 3-phase type)
Maintenance Document 1544-1 5
1 Control and test
1.1 Control of Electric Backups
H 33 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
1st stage elec. auxiliary ON (2) ON OFF OFF ON ON ON OFF
2nd stage elec. 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 and 3-phase type)
6 Maintenance Document 1544-1
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.
Reset
No.: Designation of error Location
(connection) Manual Auto HP op
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
LED 2 (green) LED 1(red) Fault description
1 Flash 1 Flash Communication error between Hydraulic Unit and Outdoor unit.
4 Flashes 1 Flash Heat pump capacity signal error (Open or short).
4 Flashes 2 Flashes Hydraulic Unit heat-exchange thermistor Error.
6 Flashes 3 Flashes Inverter error.
6 Flashes 4 Flashes Active filter error.
7 Flashes 1 Flash Discharge thermistor error.
7 Flashes 2 Flashes Compressor thermistor error.
7 Flashes 3 Flashes Heat-exchange thermistor (outlet) error.
Heat-exchange thermistor (intermediate) error.
7 Flashes 4 Flashes Outdoor thermistor error.
7 Flashes 7 Flashes Heat sink thermistor error.
7 Flashes 8 Flashes Expansion valve thermistor error.
8 Flashes 4 Flashes Current sensor error.
8 Flashes 6 Flashes Pressure sensor error.
9 Flashes 4 Flashes Current trip.
9 Flashes 5 Flashes Detection of compressor position error.
Compressor start up error.
9 Flashes 7 Flashes Outdoor unit fan motor error.
10 Flashes 1 Flash Discharge temperature protection.
10 Flashes 3 Flashes Compressor temperature protection.
10 Flashes 5 Flashes Low pressure abnormal.
Continuous flashing (1 sec ON / 1 sec OFF) Pump down operation.

Split system (Single phase and 3-phase type)
Maintenance Document 1544-1 7
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 1: Typical Wiring of External Devices

Split system (Single phase and 3-phase type)
8 Maintenance Document 1544-1
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.
If it doesn't, if a fault has occurred on the outdoor unit
as indicated by the Hydraulic Unit, you must remove
the front (right-hand) facing from the outdoor unit.
Faults are coded by LED flashes. Error messages are
listed in the table below:
On the outdoor unit
When an error occurs:
- The diode “ERROR” (2) blinks
Press once on the switch “ENTER” (SW4)
- The “ERROR” (2) diode blinks several times depending on the error’s type
LED display on the outdoor unit (single phase and 3-phase)
LED display
Hydraulic Unit Diagnosis Clear
Green Red
Outdoor unit
Off Serial reverse transfer error. 1
1 flash 1 flash 1 flash Serial forward transfer error. 2
4 flashes 1 flash 22 flashes Heat pump capacity signal error 4
4 flashes 2 flashes 22 flashes Hydraulic Unit Heat ex. Sensor error 5
6 flashes 3 flashes 18 flashes Inverter error. 20
Active filter error (single phase) 21
6 flashes 4 flashes 19 flashes P.F.C. error (3-phase) 27
7 flashes 1 flash 2 flashes Discharge thermistor error. 7
7 flashes 2 flashes 8 flashes Compressor thermistor error. 11
5 flashes Heat-exchange thermistor (intermediate) error. 12
7 flashes 3 flashes 4 flashes Heat-exchange thermistor (outlet) error. 8
7 flashes 4 flashes 7 flashes Outdoor temperature thermistor error. 9
7 flashes 7 flashes 9 flashes Heat sink thermistor error. 10
7 flashes 8 flashes 6 flashes Expansion valve thermistor error. 14
8 flashes 6 flashes 3 flashes Pressure sensor error. 24
9 flashes 4 flashes 13 flashes Current trip (permanent stoppage). 15
14 flashes Detection of compressor position error (permanent stoppage). 33
9 flashes 5 flashes 15 flashes Compressor start up error (permanent stoppage). 17
16 flashes Outdoor unit fan 1 motor error.
9 flashes 7 flashes 17 flashes Outdoor unit fan 2 motor error. 18
10 flashes 1 flash 11 flashes Discharge temperature protection (permanent stoppage). 22
10 flashes 3 flashes 12 flashes Compressor temperature protection (permanent stoppage). 25
10 flashes 5 flashes 20 flashes Low pressure abnormal. 26
Continuous flashing Pump down operation.
Continuous
lighting
Off Defrosting.

Split system (Single phase and 3-phase type)
Maintenance Document 1544-1 9
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
Hydraulic Unit LED: Green 1 flash / Red 1 flash
Outdoor Unit LED: Off
Probable causes:
Misconnection.
External cause.
Main 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 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 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 Main PCB.
OK
1-2. Check for external causes:
- Check the system's overall isolation.
- Check for any equipment generating
electromagnetic waves which interfere with the
communication between the hydraulic unit and the
outdoor unit.
2. Check the connections:
- Check the connection between the hydraulic
unit and the outdoor unit.
- Check the connections between the outdoor
unit main board and the active filter board.

Split system (Single phase and 3-phase type)
10 Maintenance Document 1544-1
Clear 2: Serial forward transfer error
Hydraulic Unit LED: Green 1 flash / Red 1 flash
Outdoor Unit LED: 1 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 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 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
electromagnetic waves which interfere with the
communication between the hydraulic unit and the
outdoor unit.
2. Check the connections:
- Check the connection between the hydraulic
unit and the outdoor unit.
- Check the connections between the outdoor
unit main board and the active filter board.

Split system (Single phase and 3-phase type)
Maintenance Document 1544-1 11
Clear 4: Heat pump capacity signal error
Hydraulic Unit LED: Green 4 flashes / Red 1 flash
Outdoor Unit LED: 22 flashes
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. Check 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 and 3-phase type)
12 Maintenance Document 1544-1
Clear 5: Hydraulic Unit Heat exchanger thermistor error
Hydraulic Unit LED: Green 4 flashes / Red 2 flashes
Outdoor Unit LED: 22 flashes
Probable causes:
Misconnection.
Sensor failure.
Interface PCB failure.
Check:
1. Check 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 (k) 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
G
r
a
y
G
r
a
y
Black

Split system (Single phase and 3-phase type)
Maintenance Document 1544-1 13
Clear 7: Discharge thermistor error
Hydraulic Unit LED: Green 7 flashes / Red 1 flash
Outdoor Unit LED: 2 flashes
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) 0 5 10 15 20 30 40 50
Resistance (kΩ) 168 130 101 79 63 40 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)
- If there is no voltage, replace Main PCB.
OK
THERMISTOR
(COMPRESSOR)
THERMISTOR
(OUTDOOR)
THERMISTOR
(PIPE)
THERMISTOR
(DISCHARGE)
THERMISTOR
(HEAT SINK)
THERMISTOR
(PIPE MID)
THERMISTOR
(EXPANSION)

Split system (Single phase and 3-phase type)
14 Maintenance Document 1544-1
Clear 8: Heat-exchange thermistor (outlet) error :
Hydraulic Unit LED: Green 7 flashes / Red 3 flashes
Outdoor Unit LED: 4 flashes
Probable causes:
Misconnection.
Sensor fault.
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 resistancer value
Temperature (°C) -10 -5 0 10 15 20 25 30
Resistance (kΩ) 27,5 20,9 16,1 12,4 9,73 7,67 6,1 3,95
- If the thermistor is faulty, replace it.
3. Check the electronic board voltage:
- Make sure circuit diagram of outdoor unit and check terminal voltage at thermistor
(DC5.0V)
- If there is no voltage, replace Main PCB.
OK
OK
THERMISTOR
(COMPRESSOR)
THERMISTOR
(OUTDOOR)
THERMISTOR
(PIPE)
THERMISTOR
(DISCHARGE)
THERMISTOR
(HEAT SINK)
THERMISTOR
(PIPE MID)
THERMISTOR
(EXPANSION)

Split system (Single phase and 3-phase type)
Maintenance Document 1544-1 15
Clear 9: Outdoor temperature thermistor error
Hydraulic Unit LED: Green 7 flashes / Red 4 flashes
Outdoor Unit LED: 7 flashes
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
3. Check the electronic board voltage:
- Make sure circuit diagram of outdoor unit and check terminal voltage at thermistor (DC5.0V)
- If there is no voltage, replace Main PCB.
OK
THERMISTOR
(COMPRESSOR)
THERMISTOR
(OUTDOOR)
THERMISTOR
(PIPE)
THERMISTOR
(DISCHARGE)
THERMISTOR
(HEAT SINK)
THERMISTOR
(PIPE MID)
THERMISTOR
(EXPANSION)

Split system (Single phase and 3-phase type)
16 Maintenance Document 1544-1
Clear 10: Heat Sink Thermistor error
Hydraulic Unit LED: Green 7 flashes / Red 7 flashes
Outdoor Unit LED: 9 flashes
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) 0 5 10 15 20 30 40 50
Resistance (kΩ) 15,8 12,2 9,5 7,5 5,9 3,78 2,50 1,69
Temperature (°C) 60 70 80 90 100 120
Resistance (kΩ) 1,17 0,83 0,6 0,44 0,33 0,19
- 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)
- If there is no voltage, replace Main PCB.
OK
THERMISTOR
(COMPRESSOR)
THERMISTOR
(OUTDOOR)
THERMISTOR
(PIPE)
THERMISTOR
(DISCHARGE)
THERMISTOR
(HEAT SINK)
THERMISTOR
(PIPE MID)
THERMISTOR
(EXPANSION)

Split system (Single phase and 3-phase type)
Maintenance Document 1544-1 17
Clear 11: Compressor thermistor error
Hydraulic Unit LED: Green 7 flashes / Red 2 flashes
Outdoor Unit LED: 8 flashes
Probable causes:
Misconnection.
Sensor failure.
Main PCB failure.
Check:
1. Check 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) 168 130 101 79 63 40 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)
- If there is no voltage, replace Main PCB.
OK
THERMISTOR
(COMPRESSOR)
THERMISTOR
(OUTDOOR)
THERMISTOR
(PIPE)
THERMISTOR
(DISCHARGE)
THERMISTOR
(HEAT SINK)
THERMISTOR
(PIPE MID)
THERMISTOR
(EXPANSION)

Split system (Single phase and 3-phase type)
18 Maintenance Document 1544-1
Clear 12: Heat-exchange thermistor (intermediate) error
Hydraulic Unit LED: Green 7 flashes / Red 3 flashes
Outdoor Unit LED: 5 flashes
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) -10 -5 0 10 15 20 25 30
Resistance (kΩ) 27,5 20,9 16,1 12,4 9,73 7,67 6,10 3,95
- If the thermistor is faulty, replace it.
3. Check the electronic board voltage:
- Make sure circuit diagram of outdoor unit and check terminal voltage at thermistor (DC5.0V)
- If there is no voltage, replace Main PCB.
OK
OK
THERMISTOR
(COMPRESSOR)
THERMISTOR
(OUTDOOR)
THERMISTOR
(PIPE)
THERMISTOR
(DISCHARGE)
THERMISTOR
(HEAT SINK)
THERMISTOR
(PIPE MID)
THERMISTOR
(EXPANSION)

Split system (Single phase and 3-phase type)
Maintenance Document 1544-1 19
Clear 14: Expansion valve thermistor error
Hydraulic Unit LED: Green 7 flashes / Red 8 flashes
Outdoor Unit LED: 6 flashes
Probable causes:
Misconnection.
Sensor failure.
Main PCB failure.
Check:
1. Check 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) 168 130 101 79 63 40 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)
- If there is no voltage, replace Main PCB.
OK
THERMISTOR
(COMPRESSOR)
THERMISTOR
(OUTDOOR)
THERMISTOR
(PIPE)
THERMISTOR
(DISCHARGE)
THERMISTOR
(HEAT SINK)
THERMISTOR
(PIPE MID)
THERMISTOR
(EXPANSION)

Split system (Single phase and 3-phase type)
20 Maintenance Document 1544-1
Clear 15: Current trip (permanent stoppage)
Hydraulic Unit LED: Green 9 flashes / Red 4 flashes
Outdoor Unit LED: 13 flashes
Probable causes:
Connection failure.
Outdoor Heat Exchanger clogged.
Outdoor Fan operation failure.
Compressor failure.
Main PCB failure.
Check:
1. 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.
U
p
on correctin
g
the removed connector or mis-wirin
g,
reset the
p
ower.
OK
3. Check Outdoor Fan:
- Check Outdoor Fan Motor. (Refer to Clear 18)
If the Fan Motor is failure, replace it.
OK
4. Check Compressor:
Refer to “Service parts information 2 : Inverter compressor
If it is abnormal, replace compressor.
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.
5. Replace Inverter PCB:
If Check Point 1 ~ 4 do not improve the symptom, replace Inverter PCB.
OK