Fujitsu Waterstage WOYG160LJL Technical manual

2105_EN_1
11/10/2019
MAINTENANCE DOCUMENT
Air to Water Heat Pump Split single service
and integrated DHW type
For professionals. To be kept by the user for future reference
EN
Outdoor unit
WOYG160LJL
WOYK150LJL
WOYK170LJL
Hydraulic unit
WSYG160DJ6
WSYK170DJ9
WGYG160DJ6
WGYK170DJ9

- 2 -
Contents
 Control and test 4
Control of Electric Backups . . . . . . . . . . . . . . . . . . 4 Sensor and Input Test Mode . . . . . . . . . . . . . . . . . 4
 Fault 5
Fault List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Hydraulic Unit Fault . . . . . . . . . . . . . . . . . . . . . . . . 5
Outdoor Unit Fault . . . . . . . . . . . . . . . . . . . . . . . . . 8
Outdoor Unit Clearing . . . . . . . . . . . . . . . . . . . . . 10
Failures with Error Code . . . . . . . . . . . . . . . . . . . 10
Failures With No Error Code . . . . . . . . . . . . . . . . 33
Sensor Values . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Outdoor Unit Temperature Sensors . . . . . . . . . . . 37
Hydraulic Unit Temperature Sensors . . . . . . . . . . 37
Service parts information . . . . . . . . . . . . . . . . . . . 38
Service parts information 1 : Compressor . . . . . . 38
Service parts information 2 : Inverter compressor . . 38
Service parts information 3 : Outdoor unit
electronic expansion valve (EEV, EEV (INJ)) . . . 39
Service parts information 4 : Outdoor unit solenoid
valve (SV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Operating Limits . . . . . . . . . . . . . . . . . . . . . . . . . 42
 Failures 43
Hydraulic, Electric and Refrigeration Systems . . 43
Hydraulic System . . . . . . . . . . . . . . . . . . . . . . . .43
Electrical System . . . . . . . . . . . . . . . . . . . . . . . . . 44
Refrigeration System . . . . . . . . . . . . . . . . . . . . . .45
Compressor Operating Checks . . . . . . . . . . . . . . 47
Refrigeration Circuit Leak Test . . . . . . . . . . . . . . 47
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . 47
 Control Settings 48
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Setting parameters . . . . . . . . . . . . . . . . . . . . . . .48
Recommended settings for the parameters
depending on the installation's emitters . . . . . . . 48
Function Table . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Adjustment Function Details . . . . . . . . . . . . . . . . 65
Date and Time Functions . . . . . . . . . . . . . . . . . . 65
User Interface Functions . . . . . . . . . . . . . . . . . . . 65
Time Program Functions (heating circuit 1 & 2,
DHW, cooling) . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Heating Circuit 1 & 2 Functions . . . . . . . . . . . . . . 67
Cooling Circuit 1 Function . . . . . . . . . . . . . . . . . . 74
DHW Functions (with DHW kit or with integrated
DHW models) . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Swimming Pool Functions . . . . . . . . . . . . . . . . . . 79
Heat Pump Functions . . . . . . . . . . . . . . . . . . . . . 80
Supplementary source . . . . . . . . . . . . . . . . . . . . 82
DHW Tank Functions (with DHW kit or with
integrated DHW models) . . . . . . . . . . . . . . . . . . 83
Confi guration Functions . . . . . . . . . . . . . . . . . . . 84
Error Functions . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Maintenance / Special Operating Mode Functions . . 88
Input / Output Testing Functions . . . . . . . . . . . . . 89
Status Functions . . . . . . . . . . . . . . . . . . . . . . . . . 90
Generator Diagnosis Functions . . . . . . . . . . . . . . 92
Consumer Diagnosis Functions . . . . . . . . . . . . . 92
This appliance must be installed by qualifi ed personnel holding a certifi cate of competence in the
handling of refrigerants.
Waterstage / Maintenance Manual / 2105 - EN

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 Servicing 96
Hydraulic checks . . . . . . . . . . . . . . . . . . . . . . . . . 96
Maintenance of the DHW tank (Duo models) . . . 96
Emptying the hot water tank . . . . . . . . . . . . . . . . 96
Descaling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Checking the outdoor unit . . . . . . . . . . . . . . . . . . 96
Checking the electrical circuit . . . . . . . . . . . . . . . 96
 Maintenance 97
Emptying the hydraulic unit . . . . . . . . . . . . . . . . . 97
Distribution valve . . . . . . . . . . . . . . . . . . . . . . . . . 97
ACI check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
 Disassembly Process of Outdoor Unit 98
Single phase type . . . . . . . . . . . . . . . . . . . . . . . . 98
Appearance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Service panel removal . . . . . . . . . . . . . . . . . . . . . 98
Main PCB removal . . . . . . . . . . . . . . . . . . . . . . . 99
Inverter PCB and Filter PCB removal . . . . . . . . 100
Pressure sensor, solenoid coil removal . . . . . . . 103
EEV coil removal . . . . . . . . . . . . . . . . . . . . . . . . 106
Thermistor removal . . . . . . . . . . . . . . . . . . . . . . 106
Fan motor removal . . . . . . . . . . . . . . . . . . . . . . 107
Top panel removal . . . . . . . . . . . . . . . . . . . . . . . 108
Reactor removal . . . . . . . . . . . . . . . . . . . . . . . . 109
Pipe cover front removal . . . . . . . . . . . . . . . . . . 110
Right panel removal . . . . . . . . . . . . . . . . . . . . . 110
Compressor removal . . . . . . . . . . . . . . . . . . . . . 111
Precautions for exchange of refrigerant-cycle-parts . 116
3 phase type . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
Appearance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
Service panel removal . . . . . . . . . . . . . . . . . . . . 118
Main PCB removal . . . . . . . . . . . . . . . . . . . . . . 119
Inverter PCB and Filter PCB removal . . . . . . . . 120
Pressure sensor, solenoid coil removal . . . . . . . 123
EEV coil removal . . . . . . . . . . . . . . . . . . . . . . . . 126
Thermistor removal . . . . . . . . . . . . . . . . . . . . . . 126
Fan motor removal . . . . . . . . . . . . . . . . . . . . . . 127
Top panel removal . . . . . . . . . . . . . . . . . . . . . . . 128
Reactor removal . . . . . . . . . . . . . . . . . . . . . . . . 129
Pipe cover front removal . . . . . . . . . . . . . . . . . . 130
Right panel removal . . . . . . . . . . . . . . . . . . . . . 130
Compressor removal . . . . . . . . . . . . . . . . . . . . . 131
Precautions for exchange of refrigerant-cycle-parts . 136
 Setting for Defrost determination control 94
Setting for Defrost determination control . . . . . . . 95
Waterstage / Maintenance Manual / 2105 - EN

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 Control and test
►
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" ON "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).
►
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 fl ow 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 (Tariff s 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
Waterstage / Maintenance Manual / 2105 - EN

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 Fault
►
Fault List
▼
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
fl ashes; press again to confi rm 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.
Nr Designation of error Location (connection) Reset HP op
Manual Auto
10 Outdoor sensor X84 No No Yes
30 Flow sensor mixing circuit X153 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 X86 No No Yes
65 Room sensor 2 X150 No No Yes
83 BSB, Short circuit No No Yes
105 Maintenance message No No Yes
121 Flow temp mixing circuit (too low) No No Yes
122 Flow temp direct circuit (too low) No No Yes
127 Legionella temp No No Yes
212 Internal comm failure No No Yes
356 Flowmeter X86 No No No
369 External fault (safety component) X11 (EX3) No No No
370 Thermodynamic source* No No No
441 BX31 no function No No No
442 BX24 no function No No No
443 BX33 no function No No No
444 BX34 no function No No No
516 Heat pump missing 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.
Waterstage / Maintenance Manual / 2105 - EN

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Outdoor unit
Error number
LED display Error contents
LED 2 (green) LED 1 (red)
11 1 Flash 1 Flash Communication error between Hydraulic unit and Outdoor unit
23 2 Flashs 3 Flashs Connection forbidden (series error)
31 3 Flashs 1 Flash Indoor unit power supply abnormal
32 3 Flashs 2 Flashs Serial communication error between Controller /Interface PCBs
41 4 Flashes 1 Flash Heat pump capacity signal error (Open or short)
42 4 Flashes 2 Flashes Hydraulic unit heat-exchange thermistor Error
61 6 Flashs 1 Flash Outdoor unit power supply abnormal
62 6 Flashs 2 Flashs Outdoor unit main PCB error
63 6 Flashes 3 Flashes Inverter error
64 6 Flashes 4 Flashes Active fi lter error
65 6 Flashs 5 Flashs Outdoor unit IPM error
67 6 Flashs 7 Flashs Outdoor unit power short interruption error (protective operation)
68 6 Flashs 8 Flashs Outdoor unit magnetic relay error
71 7 Flashes 1 Flash Discharge thermistor error
72 7 Flashes 2 Flashes Compressor thermistor error
73 7 Flashes 3 Flashes Heat-exchange thermistor (outlet / intermediate) error
74 7 Flashes 4 Flashes Outdoor thermistor error
77 7 Flashs 7 Flashs Outdoor unit heat sink temp. thermistor error
78 7 Flashes 8 Flashes Expansion valve thermistor error
84 8 Flashes 4 Flashes Current sensor error
86 8 Flashes 6 Flashes Pressure sensor error / Pressure switch error
94 9 Flashes 4 Flashes Current trip
95 9 Flashes 5 Flashes Detection of compressor position error / Compressor start up error
97 9 Flashes 7 Flashes Outdoor unit fan1 motor error
98 9 Flashes 8 Flashes Outdoor unit fan2 motor error
A1 10 Flashes 1 Flash Discharge temperature protection
A3 10 Flashes 3 Flashes Compressor temperature protection
A4 10 Flashs 4 Flashs Outdoor unit pressure error
A5 10 Flashes 5 Flashes Low pressure abnormal
A9 10 Flashs 9 Flashs Current overload error
-Continuous flashing
(1 sec On / 1 sec Off) Pump down operation
-Continuous
lighting OffDefrosting
fig. 1 - Location of DIP switches and diodes on the
hydraulic unit interface card
ON
DIP SW
Interface Board
LED2
(Green)
LED1
(Red)
Waterstage / Maintenance Manual / 2105 - EN

- 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 fl oor
can be wired to input EX3 (E20) to avoid excessively
high temperatures in the fl oor.
fig. 2 - Connections to the heat pump regulator (accessories and options)
EX1
EX2
EX3
X86
L
X84
X11
654
56
M B9
121 32
654
132
Power shedding or EJP
(peak day removal)
Tariffs, peak times/off-peak times,
day / night
External fault
** Room
thermostat
T55
** Room
thermostat
radio T58
Outdoor
sensor
** Room
control unit
T75
** Room control
unit radio
T78
External component
contact*
(faults, load
shedder, power meter)
or or or
External component contact*
(faults, power limiter, electricity meter)
Outside
sensor
Power limitation or EDR
(Energy Demand Reduction)
Tariff s, peak times/off -peak times,
day/night
External fault
* If the control device does not provide a potential-free contact, the contact must be relayed to create equivalent wiring. In all cases, please refer
to the instruction manuals for the external components (load shedder, power meters) to create the wiring.
** Option
The connection of terminal 3 of the room control unit is not mandatory (lighting of the room control unit).
Waterstage / Maintenance Manual / 2105 - EN

- 8 -
▼
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 fl ashes.
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” (SW109).
- The “ERROR” (2) diode blinks several times depending
on the error’s type.
fig. 3 - Location of switches and LED on single phase and
3-phases outdoor unit
Waterstage / Maintenance Manual / 2105 - EN

- 9 -
LED display Error contents
1 Flash Serial forward transfer error.
2 Flashes Discharge thermistor error.
3 Flashes Pressure switch error.
4 Flashes Heat-exchange thermistor (outlet) error.
6 Flashes Expansion valve thermistor error.
7 Flashes Outdoor temperature thermistor error.
8 Flashes Compressor thermistor error.
9 Flashes Transistor PCB error.
11 Flashes Discharge temperature error (permanent stoppage).
12 Flashes Compressor temperature error (permanent stoppage).
13 Flashes Over current error (permanent stoppage).
14 Flashes * Detection of compressor position error (permanent stoppage).
15 Flashes Compressor start up error (permanent stoppage).
16 Flashes Fan motor 1 error (permanent stoppage).
17 Flashes Fan motor 2 error (permanent stoppage).
18 Flashes Inverter error.
20 Flashes Low pressure abnormal.
23 Flashes Discharge pressure sensor error.
24 Flashes Suction pressure sensor error.
* only 3-phase outdoor unit.
Waterstage / Maintenance Manual / 2105 - EN

- 10 -
►
Outdoor Unit Clearing
This section describes the techniques which can be used to identify the failure.
▼
Failures with Error Code
Clear 1: Serial reverse transfer error
Hydraulic Unit LED: Green 1 fl ash / Red 1 fl ash
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.
Waterstage / Maintenance Manual / 2105 - EN

- 11 -
Clear 2: Serial forward transfer error
Hydraulic Unit LED: Green 1 fl ash / Red 1 fl ash
Outdoor Unit LED: 1 fl ash
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.
Waterstage / Maintenance Manual / 2105 - EN

- 12 -
Clear 4: Heat pump capacity signal error
Hydraulic Unit LED: Green 4 fl ashes / Red 1 fl ash
Outdoor Unit LED: 22 fl ashes
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 < 10
OK
3. Replace interface PCB:
If check point 1 and 2 do not improve the symptom, replace Interface PCB.
OK
Waterstage / Maintenance Manual / 2105 - EN

- 13 -
Clear 5: Hydraulic Unit Heat exchanger thermistor error
Hydraulic Unit LED: Green 4 fl ashes / Red 2 fl ashes
Outdoor Unit LED: 22 fl ashes
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
Gray
Gray
Black
Waterstage / Maintenance Manual / 2105 - EN

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Clear 7: Discharge thermistor error
Hydraulic Unit LED: Green 7 fl ashes / Red 1 fl ash
Outdoor Unit LED: 2 fl ashes
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 (k) 168 130 101 79 63 40 26,3 17,8
Temperature (°C) 60 70 80 90 100 120
Resistance (k) 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)
Waterstage / Maintenance Manual / 2105 - EN

- 15 -
Clear 8: Heat-exchange thermistor (outlet) error :
Hydraulic Unit LED: Green 7 fl ashes / Red 3 fl ashes
Outdoor Unit LED: 4 fl ashes
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 (k) 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)
Waterstage / Maintenance Manual / 2105 - EN

- 16 -
Clear 9: Outdoor temperature thermistor error
Hydraulic Unit LED: Green 7 fl ashes / Red 4 fl ashes
Outdoor Unit LED: 7 fl ashes
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 (k) 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)
Waterstage / Maintenance Manual / 2105 - EN

- 17 -
Clear 10: Heat Sink Thermistor error
Hydraulic Unit LED: Green 7 fl ashes / Red 7 fl ashes
Outdoor Unit LED: 9 fl ashes
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 (k) 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 (k) 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)
Waterstage / Maintenance Manual / 2105 - EN

- 18 -
Clear 11: Compressor thermistor error
Hydraulic Unit LED: Green 7 fl ashes / Red 2 fl ashes
Outdoor Unit LED: 8 fl ashes
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 (k) 168 130 101 79 63 40 26,3 17,8
Temperature (°C) 60 70 80 90 100 120
Resistance (k) 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)
Waterstage / Maintenance Manual / 2105 - EN

- 19 -
Clear 12: Heat-exchange thermistor (intermediate) error
Hydraulic Unit LED: Green 7 fl ashes / Red 3 fl ashes
Outdoor Unit LED: 5 fl ashes
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 (k) 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)
Waterstage / Maintenance Manual / 2105 - EN

- 20 -
Clear 14: Expansion valve thermistor error
Hydraulic Unit LED: Green 7 fl ashes / Red 8 fl ashes
Outdoor Unit LED: 6 fl ashes
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 (k) 168 130 101 79 63 40 26,3 17,8
Temperature (°C) 60 70 80 90 100 120
Resistance (k) 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)
Waterstage / Maintenance Manual / 2105 - EN