Daikin Altherma 3 H HT ECH2O Series User manual

Service manual
Daikin Altherma 3 H HT ECH₂O
EPRA14D▲V▼
EPRA16D▲V▼
EPRA18D▲V▼
EPRA14D▲W▼
EPRA16D▲W▼
EPRA18D▲W▼
ETSH16P30E▲▼
ETSH16P50E▲▼
ETSHB16P30E▲▼
ETSHB16P50E▲▼
ETSX16P30E▲▼
ETSX16P50E▲▼
ETSXB16P30E▲▼
ETSXB16P50E▲▼
▲= A, B, C, …, Z
▼= , , 1, 2, 3, …, 9

Disclaimer
Service manual
2
EPRA14~18D + ETSH/X(B)16P30+50E
Daikin Altherma 3 H HT ECH₂O
ESIE22-11A – 2023.06
Disclaimer
The present publication is drawn up by way of information only and does not constitute an offer binding upon
Daikin Europe N.V.. Daikin Europe N.V. has compiled the content of this publication to the best of its knowledge.
No express or implied warranty is given for the completeness, accuracy, reliability or fitness for particular purpose
of its content and the products and services presented therein. Specifications are subject to change without prior
notice. Daikin Europe N.V. explicitly rejects any liability for any direct or indirect damage, in the broadest sense,
arising from or related to the use and/or interpretation of this publication. All content is copyrighted by Daikin
Europe N.V..

Version log
Service manual
3
EPRA14~18D + ETSH/X(B)16P30+50E
Daikin Altherma 3 H HT ECH₂O
ESIE22-11A – 2023.06
Version log
Version code Description Date
ESIE22-11 Document release January 2023
ESIE22-11A See below June 2023
The following updates have been applied to the Service Manual:
•Outdoor unit models EPRA14~18DBW17 added.
•Error based troubleshooting: Error codes EA-01, F3-24 and J3-47 added.
•Components - Compressor: To perform an electrical check of the compressor updated for new outdoor units.
•Components – Main PCB: Check and repair procedures for new outdoor units added.
•Components – Noise filter PCB: Check and repair procedures for new outdoor units added.
•Components – Outdoor unit fan motor: To perform an electrical check of the DC fan motor assembly updated
for new outdoor units.
•Components – Reactor: Check and repair procedures for new outdoor units added.
•Components – Plate work: To remove and install the switch box for new outdoor units added.
•Third party components – Refrigerant circuit: To recuperate the refrigerant was updated.
•Technical data – Piping diagram: Updated for new outdoor units.
•Technical data – Wiring diagram: Diagram for new outdoor units added.
•Technical data – Component overview: Component overview for new outdoor units added.

Table of contents
Service manual
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EPRA14~18D + ETSH/X(B)16P30+50E
Daikin Altherma 3 H HT ECH₂O
ESIE22-11A – 2023.06
Table of contents
1 Safety precautions 8
1.1 Meaning of warnings and symbols................................................................................................................................. 8
1.2 Dangers ........................................................................................................................................................................... 9
1.3 Warnings ......................................................................................................................................................................... 9
1.4 Cautions .......................................................................................................................................................................... 15
1.5 Notices ............................................................................................................................................................................ 15
2 General operation 16
3 Troubleshooting 18
3.1 To display the help text in case of a malfunction........................................................................................................... 18
3.2 To reset the error code................................................................................................................................................... 18
3.3 To check the malfunction history ................................................................................................................................... 19
3.4 To check the running hours of the system..................................................................................................................... 19
3.5 Error based troubleshooting........................................................................................................................................... 20
3.5.1 7H-01 – Water flow problem ......................................................................................................................... 20
3.5.2 7H-04 – Water flow problem during domestic hot water production.......................................................... 21
3.5.3 7H-05 – Water flow problem during heating/sampling ................................................................................ 22
3.5.4 7H-06 – Water flow during cooling/defrost................................................................................................... 23
3.5.5 7H-07 – Water flow problem. Pump de-blocking active ............................................................................... 24
3.5.6 7H-08 – Pump abnormality during normal operation (pump feedback) ...................................................... 24
3.5.7 80-01 – Entering water thermistor abnormality of outdoor unit ................................................................. 25
3.5.8 81-00 – Outlet water thermistor abnormality............................................................................................... 25
3.5.9 81-01 – Mixed water thermistor abnormality ............................................................................................... 26
3.5.10 81-06 – Entering water temperature thermistor abnormality (indoor unit) ................................................ 26
3.5.11 81-07 – Mixed leaving water temperature after tank thermistor abnormality............................................ 26
3.5.12 89-01 – Heat exchanger freeze-up protection activated during defrost (error) .......................................... 27
3.5.13 89-02 – Heat exchanger freeze-up protection activated during heating/domestic hot water .................... 28
3.5.14 89-03 – Heat exchanger freeze-up protection activated during defrost (warning) ..................................... 28
3.5.15 89-05 – Heat exchanger freeze-up protection activated during cooling (error) .......................................... 29
3.5.16 89-06 – Heat exchanger freeze-up protection activated during cooling (warning) ..................................... 30
3.5.17 8F-00 – Abnormal increase outlet water temperature (domestic hot water).............................................. 31
3.5.18 8H-00 – Abnormal increase outlet water temperature................................................................................. 32
3.5.19 8H-01 – Overheating mixed water circuit...................................................................................................... 32
3.5.20 8H-02 – Overheating mixed water circuit (thermostat) ................................................................................ 33
3.5.21 8H-03 – Overheating water circuit (thermostat)........................................................................................... 33
3.5.22 8H-08 – Overheating water circuit................................................................................................................. 34
3.5.23 A1-00 – Zero cross detection problem .......................................................................................................... 35
3.5.24 A5-00 – Outdoor unit: High pressure peak cut / freeze protection problem ............................................... 35
3.5.25 AA-01 – Backup heater overheated ............................................................................................................... 36
3.5.26 AH-00 – Tank disinfection function not completed correctly ....................................................................... 37
3.5.27 AJ-03 – Too long domestic hot water heat-up time required ....................................................................... 38
3.5.28 C0-00 – Flow sensor malfunction................................................................................................................... 39
3.5.29 C0-01 – Flow switch malfunction ................................................................................................................... 39
3.5.30 C0-02 – Flow switch malfunction ................................................................................................................... 40
3.5.31 C4-00 – Heat exchanger temperature sensor problem................................................................................. 41
3.5.32 C5-00 – Heat exchanger thermistor abnormality .......................................................................................... 41
3.5.33 CJ-02 – Room temperature sensor problem ................................................................................................. 42
3.5.34 E1-00 – Outdoor unit: PCB defect.................................................................................................................. 43
3.5.35 E2-00 – Leakage current detection error....................................................................................................... 44
3.5.36 E3-00 – Outdoor unit: Actuation of high pressure switch............................................................................. 45
3.5.37 E3-24 – High pressure switch abnormality .................................................................................................... 46
3.5.38 E4-00 – Abnormal suction pressure............................................................................................................... 47
3.5.39 E5-00 – Outdoor unit: Overheat of inverter compressor motor................................................................... 47
3.5.40 E6-00 – Outdoor unit: Compressor startup defect........................................................................................ 48
3.5.41 E7-00 – Outdoor unit: Malfunction of outdoor unit fan motor .................................................................... 49
3.5.42 E8-00 – Outdoor unit: Power input overvoltage ........................................................................................... 50
3.5.43 E9-00 – Malfunction of electronic expansion valve....................................................................................... 51
3.5.44 EA-00 – Outdoor unit: Cool/heat switchover problem ................................................................................. 52
3.5.45 EA-01 – 4-way valve switching error.............................................................................................................. 53
3.5.46 EC-00 – Abnormal increase tank temperature .............................................................................................. 54
3.5.47 EC-04 – Tank preheating ................................................................................................................................ 54
3.5.48 F3-00 – Outdoor unit: Malfunction of discharge pipe temperature............................................................. 55
3.5.49 F3-24 – Compressor shell temperature error................................................................................................ 55
3.5.50 F6-00 – Outdoor unit: Abnormal high pressure in cooling............................................................................ 56

Table of contents
Service manual
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EPRA14~18D + ETSH/X(B)16P30+50E
Daikin Altherma 3 H HT ECH₂O
ESIE22-11A – 2023.06
3.5.51 FA-00 – Outdoor unit: Abnormal high pressure, actuation of high pressure switch.................................... 57
3.5.52 H0-00 – Outdoor unit: Voltage/current sensor problem .............................................................................. 58
3.5.53 H1-00 – External temperature sensor problem ............................................................................................ 59
3.5.54 H3-00 – Outdoor unit: Malfunction of high pressure switch ........................................................................ 59
3.5.55 H4-00 – Malfunction of low pressure switch................................................................................................. 60
3.5.56 H5-00 – Malfunction of compressor overload protection ............................................................................ 60
3.5.57 H6-00 – Outdoor unit: Malfunction of position detection sensor ................................................................ 61
3.5.58 H8-00 – Outdoor unit: Malfunction of compressor input system................................................................. 62
3.5.59 H9-00 – Outdoor unit: Malfunction of outdoor air thermistor ..................................................................... 62
3.5.60 HC-01 – Second tank temperature sensor problem...................................................................................... 63
3.5.61 HC-09 – Tank temperature sensor problem .................................................................................................. 63
3.5.62 HJ-10 – Water pressure sensor abnormality ................................................................................................. 64
3.5.63 J3-00 – Outdoor unit: Malfunction of discharge pipe thermistor ................................................................. 64
3.5.64 J3-10 – Compressor port thermistor abnormality......................................................................................... 65
3.5.65 J3-47 – Compressor shell thermistor abnormality ........................................................................................ 65
3.5.66 J5-00 – Malfunction of suction pipe thermistor ............................................................................................ 66
3.5.67 J6-00 – Outdoor unit: Malfunction of heat exchanger thermistor ............................................................... 66
3.5.68 J6-07 – Outdoor unit: Malfunction of heat exchanger thermistor ............................................................... 67
3.5.69 J6-32 – Leaving water temperature thermistor abnormality (outdoor unit)................................................ 67
3.5.70 J6-33 – Sensor communication error............................................................................................................. 68
3.5.71 J8-00 – Malfunction of refrigerant liquid thermistor .................................................................................... 68
3.5.72 JA-00 – Malfunction of high pressure sensor ................................................................................................ 69
3.5.73 L3-00 – Outdoor unit: Electrical box temperature rise problem................................................................... 69
3.5.74 L4-00 – Outdoor unit: Malfunction of inverter radiating fin temperature rise ............................................ 70
3.5.75 L5-00 – Outdoor unit: Inverter instantaneous overcurrent .......................................................................... 71
3.5.76 L9-00 – Prevention of compressor lock ......................................................................................................... 72
3.5.77 LC-00 – Malfunction in communication system of outdoor unit .................................................................. 73
3.5.78 P1-00 – Open phase power supply imbalance .............................................................................................. 74
3.5.79 P3-00 – Abnormal direct current ................................................................................................................... 74
3.5.80 P4-00 – Outdoor unit: Malfunction of radiating fin temperature sensor ..................................................... 75
3.5.81 PJ-00 – Capacity setting mismatch................................................................................................................. 75
3.5.82 U0-00 – Outdoor unit: Shortage of refrigerant ............................................................................................. 75
3.5.83 U1-00 – Malfunction by reverse phase/open phase ..................................................................................... 76
3.5.84 U2-00 – Outdoor unit: Defect of power supply voltage ................................................................................ 77
3.5.85 U3-00 – Under floor heating screed dry out function not completed correctly .......................................... 78
3.5.86 U4-00 – Indoor/outdoor unit communication problem................................................................................ 78
3.5.87 U5-00 – User interface communication problem.......................................................................................... 79
3.5.88 U6-38 – Extension/hydro communication problem ...................................................................................... 80
3.5.89 U7-00 – Outdoor unit: Transmission malfunction between main microcomputer - inverter
microcomputer............................................................................................................................................... 81
3.5.90 U8-02 – Connection with room thermostat lost ........................................................................................... 81
3.5.91 U8-03 – No connection with room thermostat ............................................................................................. 82
3.5.92 U8-04 – Unknown USB device........................................................................................................................ 83
3.5.93 U8-05 – File malfunction ................................................................................................................................ 83
3.5.94 U8-06 – Bizone kit CANOpen communication error...................................................................................... 84
3.5.95 U8-07 – P1/P2 communication error............................................................................................................. 84
3.5.96 U8-09 – User interface software version / indoor unit compatibility error.................................................. 85
3.5.97 U8-11 – Connection with wireless gateway lost............................................................................................ 85
3.5.98 UA-00 – Indoor unit, outdoor unit mismatching problem ............................................................................ 86
3.5.99 UA-16 – Extension/hydro communication problem...................................................................................... 86
3.5.100 UA-59 – HPSU/hydro combination abnormality............................................................................................ 87
3.5.101 UF-00 – Reversed piping or bad communication wiring detection............................................................... 88
3.6 Symptom based troubleshooting ................................................................................................................................... 89
3.6.1 Symptom: Incorrect energy metering read-out ............................................................................................ 89
3.6.2 Water pump related....................................................................................................................................... 89
3.6.3 Tap water related ........................................................................................................................................... 91
3.6.4 Symptom: User interface is failure or frozen screen..................................................................................... 91
3.6.5 Symptom: Leak ............................................................................................................................................... 92
3.6.6 Symptom: Water flow or volume too low ..................................................................................................... 92
3.6.7 Compressor related........................................................................................................................................ 92
3.6.8 Symptom: Abnormal presence of ice............................................................................................................. 95
3.6.9 Symptom: Domestic hot water capacity shortage ........................................................................................ 96
3.6.10 Symptom: General capacity shortage ............................................................................................................ 97
3.6.11 Symptom: Space heating (cooling) capacity shortage................................................................................... 100
3.6.12 Symptom: Inaccurate temperature control................................................................................................... 102
3.6.13 Symptom: Power consumption too high ....................................................................................................... 103
3.6.14 Symptom: System does not start or operate................................................................................................. 105
3.6.15 Symptom: The pump is blocked..................................................................................................................... 107
4 Components 108

Table of contents
Service manual
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EPRA14~18D + ETSH/X(B)16P30+50E
Daikin Altherma 3 H HT ECH₂O
ESIE22-11A – 2023.06
4.1 3-way valve...................................................................................................................................................................... 108
4.1.1 Domestic hot water/space heating 3-way valve............................................................................................ 108
4.1.2 Internal heat generator circuit 3-way valve................................................................................................... 116
4.2 4-way valve...................................................................................................................................................................... 124
4.2.1 Checking procedures...................................................................................................................................... 124
4.2.2 Repair procedures .......................................................................................................................................... 130
4.3 ACS digital I/O PCB .......................................................................................................................................................... 133
4.3.1 Checking procedures...................................................................................................................................... 133
4.3.2 Repair procedures .......................................................................................................................................... 137
4.4 Backup heater ................................................................................................................................................................. 140
4.4.1 Checking procedures...................................................................................................................................... 140
4.4.2 Repair procedures .......................................................................................................................................... 146
4.5 Backup heater thermal protector................................................................................................................................... 152
4.5.1 Checking procedures...................................................................................................................................... 152
4.5.2 Repair procedures .......................................................................................................................................... 156
4.6 Compressor ..................................................................................................................................................................... 161
4.6.1 Checking procedures...................................................................................................................................... 161
4.6.2 Repair procedures .......................................................................................................................................... 166
4.7 Current sensor ................................................................................................................................................................ 174
4.7.1 Checking procedures...................................................................................................................................... 174
4.7.2 Repair procedures .......................................................................................................................................... 174
4.8 Expansion valve............................................................................................................................................................... 178
4.8.1 Checking procedures...................................................................................................................................... 178
4.8.2 Repair procedures .......................................................................................................................................... 181
4.9 Flash PCB ......................................................................................................................................................................... 185
4.9.1 Checking procedures...................................................................................................................................... 185
4.9.2 Repair procedures .......................................................................................................................................... 186
4.10 High pressure switch....................................................................................................................................................... 187
4.10.1 Checking procedures ...................................................................................................................................... 187
4.10.2 Repair procedures .......................................................................................................................................... 190
4.11 Hydro PCB ....................................................................................................................................................................... 193
4.11.1 Checking procedures ...................................................................................................................................... 193
4.11.2 Repair procedures .......................................................................................................................................... 197
4.12 Hydro extension PCB....................................................................................................................................................... 201
4.12.1 Checking procedures ...................................................................................................................................... 201
4.12.2 Repair procedures .......................................................................................................................................... 205
4.13 Inverter PCB .................................................................................................................................................................... 209
4.13.1 Single fan outdoor unit - single phase ........................................................................................................... 209
4.13.2 Single fan outdoor unit - three phase ............................................................................................................ 210
4.14 Leakage current PCB....................................................................................................................................................... 219
4.14.1 Checking procedures ...................................................................................................................................... 219
4.14.2 Repair procedures .......................................................................................................................................... 222
4.15 Low pressure switch ....................................................................................................................................................... 223
4.15.1 Checking procedures ...................................................................................................................................... 223
4.15.2 Repair procedures .......................................................................................................................................... 225
4.16 Main PCB......................................................................................................................................................................... 226
4.16.1 Single fan outdoor unit - single phase ........................................................................................................... 226
4.16.2 Single fan outdoor unit - three phase ............................................................................................................ 234
4.17 Noise filter PCB ............................................................................................................................................................... 255
4.17.1 Single fan outdoor unit - single phase ........................................................................................................... 255
4.17.2 Single fan outdoor unit - three phase ............................................................................................................ 263
4.18 Outdoor unit fan motor .................................................................................................................................................. 280
4.18.1 Checking procedures ...................................................................................................................................... 280
4.18.2 Repair procedures .......................................................................................................................................... 285
4.19 Plate work ....................................................................................................................................................................... 287
4.19.1 Outdoor unit ................................................................................................................................................... 287
4.19.2 Indoor unit ...................................................................................................................................................... 294
4.20 Reactor ............................................................................................................................................................................ 298
4.20.1 Checking procedures ...................................................................................................................................... 298
4.20.2 Repair procedures .......................................................................................................................................... 301
4.21 Refrigerant pressure sensor ........................................................................................................................................... 304
4.21.1 Checking procedures ...................................................................................................................................... 304
4.21.2 Repair procedures .......................................................................................................................................... 306
4.22 Solenoid valve ................................................................................................................................................................. 308
4.22.1 Checking procedures ...................................................................................................................................... 308
4.22.2 Repair procedures .......................................................................................................................................... 310
4.23 Thermistors ..................................................................................................................................................................... 315
4.23.1 Refrigerant side thermistors .......................................................................................................................... 315
4.23.2 Water side thermistors .................................................................................................................................. 322

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Service manual
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EPRA14~18D + ETSH/X(B)16P30+50E
Daikin Altherma 3 H HT ECH₂O
ESIE22-11A – 2023.06
4.23.3 Other thermistors........................................................................................................................................... 331
4.24 User interface.................................................................................................................................................................. 336
4.24.1 User interface on unit..................................................................................................................................... 336
4.24.2 Remote controller user interface................................................................................................................... 342
4.25 Water flow sensor........................................................................................................................................................... 344
4.25.1 Checking procedures ...................................................................................................................................... 344
4.25.2 Repair procedures .......................................................................................................................................... 345
4.26 Water pressure sensor.................................................................................................................................................... 348
4.26.1 Checking procedures ...................................................................................................................................... 348
4.26.2 Repair procedures .......................................................................................................................................... 350
4.27 Water pump.................................................................................................................................................................... 352
4.27.1 Checking procedures ...................................................................................................................................... 352
4.27.2 Repair procedures .......................................................................................................................................... 354
5 Third party components 361
5.1 Electrical circuit............................................................................................................................................................... 361
5.1.1 Checking procedures...................................................................................................................................... 361
5.1.2 Repair procedures .......................................................................................................................................... 364
5.2 Refrigerant circuit ........................................................................................................................................................... 365
5.2.1 Checking procedures...................................................................................................................................... 365
5.2.2 Repair procedures .......................................................................................................................................... 368
5.3 Water circuit ................................................................................................................................................................... 377
5.3.1 Checking procedures...................................................................................................................................... 377
5.3.2 Repair procedures .......................................................................................................................................... 381
5.4 Manufacturer components ............................................................................................................................................ 386
5.4.1 Checking procedures...................................................................................................................................... 386
5.4.2 Repair procedures .......................................................................................................................................... 387
5.5 External factors ............................................................................................................................................................... 387
5.5.1 Checking procedures...................................................................................................................................... 387
6 Maintenance 389
6.1 To clean the outdoor unit heat exchanger..................................................................................................................... 389
6.2 To clean the integrated filter of the shut-off valve........................................................................................................ 389
7 Technical data 391
7.1 Detailed information setting mode ................................................................................................................................ 391
7.1.1 Detailed information setting mode: Indoor unit ........................................................................................... 391
7.1.2 Detailed information setting mode: Outdoor unit ........................................................................................ 391
7.2 Wiring diagram................................................................................................................................................................ 392
7.2.1 Wiring diagram: Indoor unit........................................................................................................................... 392
7.2.2 Wiring diagram: Outdoor unit........................................................................................................................ 403
7.3 Piping diagram ................................................................................................................................................................ 413
7.3.1 Piping diagram: Indoor unit............................................................................................................................ 413
7.3.2 Piping diagram: Outdoor unit......................................................................................................................... 414
7.4 Component overview...................................................................................................................................................... 416
7.4.1 Component overview: Indoor unit................................................................................................................. 416
7.4.2 Component overview: Outdoor unit – Single phase ..................................................................................... 418
7.4.3 Component overview: Outdoor unit – Three phase...................................................................................... 419
7.5 Field information report ................................................................................................................................................. 421
7.6 Service tools .................................................................................................................................................................... 424
7.7 Field settings ................................................................................................................................................................... 425

1 | Safety precautions
Service manual
8
EPRA14~18D + ETSH/X(B)16P30+50E
Daikin Altherma 3 H HT ECH₂O
ESIE22-11A – 2023.06
1 Safety precautions
The precautions described in this document cover very important topics, follow
them carefully.
All activities described in the service manual must be performed by an authorized
person.
If you are NOT sure how to install, operate or service the unit, contact your dealer.
In accordance with the applicable legislation, it might be necessary to provide a
logbook with the product containing at least:
information on maintenance, repair work, results of tests, stand-by periods, …
Also, at least, following information must be provided at an accessible place at the
product:
▪Instructions for shutting down the system in case of an emergency
▪Name and address of fire department, police and hospital
▪Name, address and day and night telephone numbers for obtaining service
In Europe, EN378 provides the necessary guidance for this logbook.
1.1 Meaning of warnings and symbols
DANGER
Indicates a situation that results in death or serious injury.
DANGER: RISK OF ELECTROCUTION
Indicates a situation that could result in electrocution.
DANGER: RISK OF BURNING/SCALDING
Indicates a situation that could result in burning/scalding because of extreme hot or
cold temperatures.
DANGER: RISK OF EXPLOSION
Indicates a situation that could result in explosion.
WARNING
Indicates a situation that could result in death or serious injury.
WARNING: FLAMMABLE MATERIAL
CAUTION
Indicates a situation that could result in minor or moderate injury.
NOTICE
Indicates a situation that could result in equipment or property damage.

1 | Safety precautions
Service manual
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EPRA14~18D + ETSH/X(B)16P30+50E
Daikin Altherma 3 H HT ECH₂O
ESIE22-11A – 2023.06
INFORMATION
Indicates useful tips or additional information.
1.2 Dangers
DANGER: RISK OF BURNING/SCALDING
▪Do NOT touch the refrigerant piping, water piping or internal parts during and
immediately after operation. It could be too hot or too cold. Give it time to return
to normal temperature. If you MUST touch it, wear protective gloves.
▪Do NOT touch any accidental leaking refrigerant.
DANGER: RISK OF ELECTROCUTION
▪Turn OFF all power supply before removing the switch box cover, connecting
electrical wiring or touching electrical parts.
▪Where applicable, stop the equipment's operation first and allow (refrigerant)
pressure to equalize, before turning OFF the power.
▪Disconnect the power supply for more than 10minutes, and measure the voltage
at the terminals of main circuit capacitors or electrical components before
servicing. The voltage MUST be less than 50VDC before you can touch electrical
components. For the location of the terminals, see the wiring diagram. If the
measured voltage is still higher than 50VDC, discharge the capacitors in a safe
manner by using a dedicated capacitor discharge pen to avoid possibility of
sparking.
▪Do NOT touch electrical components with wet hands.
▪Do NOT leave the unit unattended when the service cover is removed.
▪Protect electric componennts from getting wet while the service cover is opened.
1.3 Warnings
WARNING
Improper installation or attachment of equipment or accessories could result in
electrical shock, short-circuit, leaks, fire or other damage to the equipment. ONLY
use accessories, optional equipment and spare parts made or approved by Daikin
unless otherwise specified.
WARNING
Do NOT apply any permanent inductive or capacitance loads to the circuit without
ensuring that this will NOT exceed the permissible voltage and current permitted for
the equipment in use.

1 | Safety precautions
Service manual
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EPRA14~18D + ETSH/X(B)16P30+50E
Daikin Altherma 3 H HT ECH₂O
ESIE22-11A – 2023.06
WARNING
If a fault exists that could compromise safety, Do NOT connect electrical supply to
the circuit until it is satisfactorily dealt with. If the fault CANNOT be corrected
immediately but it is necessary to continue operation, an adequate temporary
solution MUST be used. This MUST be reported to the owner of the equipment so all
parties are advised.
Initial safety checks MUST include that:
▪capacitors are discharged: this MUST be done in a safe manner to avoid
possibility of sparking,
▪NO live electrical components and wiring are exposed while charging, recovering
or purging the system.
WARNING
Make sure that the refrigerating piping and components are installed in a position
where they are unlikely to be exposed to any corroding substance.
WARNING
Make sure installation, testing and applied materials comply with applicable
legislation (on top of the instructions described in the Daikin documentation).
WARNING
Make sure the work site environment is clean and safe to work in. Beware of spilled
fluids, like water, oil or other substances.
Protect bystanders from injury and property from possible damage cause by service
works.
WARNING
If any work is to be conducted on the refrigerating equipment or any associated parts
which involves brazing, an appropriate dry powder or CO2 fire extinguisher MUST be
present.
When charging the unit, an appropriate dry powder or CO2 fire extinguisher MUST be
present.
WARNING
No person carrying out work in relation to a refrigerating system which involves
exposing any pipe work shall use any sources of ignition in such a manner that it may
lead to the risk of fire or explosion. All possible ignition sources, including cigarette
smoking, MUST be kept sufficiently far away from the site of installation, repairing,
removing and disposal, during which refrigerant can possibly be released to the
surrounding space. Prior to work taking place, the area around the equipment is to
be surveyed to make sure that there are no flammable hazards or ignition risks. "No
Smoking" signs MUST be displayed.
WARNING
Tear apart and throw away plastic packaging bags so that nobody, especially NOT
children, can play with them. Possible consequence: suffocation.
WARNING
During tests, NEVER pressurise the product with a pressure higher than the
maximum allowable pressure (as indicated on the nameplate of the unit).

1 | Safety precautions
Service manual
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EPRA14~18D + ETSH/X(B)16P30+50E
Daikin Altherma 3 H HT ECH₂O
ESIE22-11A – 2023.06
WARNING
Make sure the total refrigerant charge is in accordance with the room size in which
the unit is installed: please consult the detailed instructions on charging and allowed
room sizes in the installation manual.
WARNING
▪NEVER mix different refrigerants or allow air to enter the refrigerant system.
▪NEVER charge recovered refrigerant from another unit. Use recovered refrigerant
only on the same unit where it was recovered from, or have it recycled at a
certified facility.
WARNING
When reconnecting a connector to the PCB, make sure to connect it on the correct
location and do NOT apply force, as this may damage the connector or connector
pins of the PCB.
WARNING
ALWAYS recover the refrigerant. Do NOT release them directly into the environment.
Use a vacuum pump to evacuate the installation.
WARNING
Removal of refrigerant MUST be according to the following:
When breaking into the refrigerant circuit to make repairs, be sure to remove the
refrigerant from the system first. The refrigerant charge MUST be recovered into the
correct recovery cylinders.
WARNING
Take sufficient precautions in case of refrigerant leakage. If refrigerant gas leaks,
ventilate the area immediately. Possible risks:
▪Excessive refrigerant concentrations in a closed room can lead to oxygen
deficiency.
▪Toxic gas might be produced if refrigerant gas comes into contact with fire.
WARNING
▪Under no circumstances, potential sources of ignition SHALL be used in the
searching for or detection of refrigerant leaks. A halide torch (or any other
detector using a naked flame) MUST NOT be used.
▪Ensure that the detector is NOT a potential source of ignition and is suitable for
the detection of R32.
▪If a leak is suspected, all naked flames MUST be removed or extinguished.
▪Leak detection fluids are also suitable for use with most refrigerants but the use
of detergents containing chlorine MUST be avoided as the chlorine may react
with the refrigerant and corrode the copper pipe-work.
▪If a leakage of refrigerant is found which requires brazing, all of the refrigerant
MUST be recovered from the system, or isolated (by means of shut‑off valves) in
a part of the system remote from the leak.
▪Only use the electronic leak tester for R32. The old flame leak tester CANNOT be
used on a system with HFC refrigerant because there is no chlorine component in
the refrigerant. In case of R32 (HFC) refrigerant, any flame in contact with
(leaking) refrigerant is extremely dangerous.

1 | Safety precautions
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WARNING
▪In order to prevent oxygen deficiency and R32 combustion, keep the room well-
ventilated for a healthy work environment. Do NOT work in a confined space. If a
refrigerant leak is detected in a confined room or an inadequately ventilated
location, do NOT start the work until the area has been ventilated appropriately.
▪If the work area is NOT located in the open air, make sure the work area is
adequately ventilated before breaking into the system or conducting any brazing.
The ventilation MUST continue to operate during the period that the work is
carried out to prevent accumulation of refrigerant in the work area. The
ventilation should safely disperse any released refrigerant and preferably
ventilate to the open air.
WARNING
Ensure that no external live wiring is exposed while charging, recovering or purging
the system. Sparks created when live wiring is short-circuited might ignite the
refrigerant if it is leaked into the room while charging, recovering or purging the
system.
WARNING
Ensure that the unit is properly earthed prior to conducting maintenance or service
or charging the system with refrigerant. Do NOT earth the unit to a utility pipe, surge
absorber, or telephone earth. Incomplete earthing may cause electrical shock.
WARNING
▪ONLY use copper wires.
▪Make sure the field wiring complies with the applicable legislation.
▪All field wiring MUST be performed in accordance with the wiring diagram
supplied with the product.
▪NEVER squeeze bundled cables and make sure they do NOT come in contact with
the piping and sharp edges. Make sure no external pressure is applied to the
terminal connections.
▪Make sure to install earth wiring. Do NOT earth the unit to a utility pipe, surge
absorber, or telephone earth. Incomplete earth may cause electrical shock.
▪Make sure to use a dedicated power circuit. NEVER use a power supply shared by
another appliance.
▪Make sure to install the required fuses or circuit breakers.
▪Make sure to install an earth leakage protector. Failure to do so may cause
electrical shock or fire.
▪When installing the earth leakage protector, make sure it is compatible with the
inverter (resistant to high frequency electric noise) to avoid unnecessary opening
of the earth leakage protector.
WARNING
Make sure the markings on the unit remain visible and legible after inspection or
repair work. Markings and signs that are illegible shall be corrected.
WARNING
▪After finishing the electrical work, confirm that each electrical component and
terminal inside the electrical components box is connected securely.
▪Make sure all covers are closed before starting up the unit.

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WARNING
▪The area MUST be checked with an appropriate refrigerant detector prior to and
during work, to ensure the technician is aware of potentially toxic or flammable
atmospheres.
▪Ensure that the leak detection equipment being used is suitable for use with all
applicable refrigerants, i.e. non-sparking, adequately sealed or intrinsically safe.
▪Prior to and during work, the area MUST be checked with an appropriate
refrigerant detector capable of detecting R32 refrigerant, to ensure a work
environment free of refrigerant.
WARNING
▪Equipment MUST be labelled stating that it has been de-commissioned and
emptied of refrigerant.
▪The label MUST be dated and signed.
▪For appliances containing flammable refrigerants, ensure that there are labels on
the equipment stating the equipment contains flammable refrigerant.
WARNING
Before carrying out refrigerant recovery procedure, it is essential that the technician
is completely familiar with the equipment and all its details. It is recommended good
practice that all refrigerants are recovered safely. Prior to the task being carried out,
an oil and refrigerant sample MUST be taken in case analysis is required prior to re-
use of recovered refrigerant. It is essential that electrical power is available before
the task is commenced.
▪Become familiar with the equipment and its operation.
▪Isolate system electrically.
▪Ensure that mechanical handling equipment is available, if required, for handling
refrigerant cylinders.
▪Ensure that all personal protective equipment is available and is used correctly.
▪Ensure that the recovery process is supervised at all times by a competent
person.
▪Ensure that recovery equipment and cylinders are conform to the appropriate
standards.
▪If a vacuum is NOT possible, make a manifold so that refrigerant can be removed
from various parts of the system.
▪Make sure that cylinder is situated on the scales before recovery takes place.
▪Start the recovery machine and operate in accordance with instructions.
▪Do NOT overfill cylinders (no more than 60% volume liquid charge).
▪Do NOT exceed the maximum working pressure of the cylinder, NOT even
temporarily.
▪When the cylinders have been filled correctly and the process completed, make
sure that the cylinders and the equipment are removed from site promptly and
all isolation valves on the equipment are closed.
▪Recovered refrigerant MUST NOT be charged into another refrigerating system
unless it has been cleaned and checked.
WARNING
All maintenance staff and others working in the local area MUST be instructed on the
nature of work being carried out.

1 | Safety precautions
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WARNING
Provide adequate measures to prevent that the unit can be used as a shelter by small
animals. Small animals that make contact with electrical parts can cause
malfunctions, smoke or fire.
WARNING
Prior to start working on systems containing flammable refrigerant, safety checks are
necessary to ensure that the risk of ignition is minimised. Therefore, some
instructions should be followed.
Please refer to the service manual for more information.
WARNING
▪In case refrigerant recovery is required, use the appropriate service ports.
▪If applicable for your unit, use the appropriate recovery mode or field setting to
smoothly recover the refrigerant.
▪ONLY use leak free hoses, couplings and manifolds in good working condition.
▪ONLY use recovery cylinders designated and labelled to recover R32. Note that
thread connection to the cylinder is counter clock.
▪Always use a calibrated scale in good condition prior and during the refrigerant
recovery process to determine the weight of the recovered refrigerant into the
external refrigerant cylinder.
▪Read the operation instructions of the recovery unit prior to connecting the
recovery unit. Verify the recovery unit is suited for R32 refrigerant, check that it is
in good working condition, has been properly maintained and that any associated
electrical components are sealed to prevent ignition in the event of a refrigerant
release. Consult manufacturer if in doubt.
▪Do NOT overfill the refrigerant cylinder, confirm with the supplier of the
refrigerant cylinder about maximum filling ratio if NOT mentioned on the
refrigerant cylinder itself. Generally the maximum filling amount should be
limited to 60% of the maximum volume of the cylinder.
▪Do NOT exceed the maximum working pressure of the refrigerant cylinder, NOT
even temporarily.
▪When the cylinders have been filled correctly, and the refrigerant recovery
process is completed, make sure that the cylinders and the equipment are
removed from site promptly and all stop valves on the equipment are (kept)
closed.
▪The recovered refrigerant MUST be returned to the refrigerant supplier in the
correct recovery cylinder, and the relevant waste transfer note arranged. Do NOT
mix refrigerants in recovery units and especially NOT in cylinders.
▪Recovered refrigerant MUST NOT be charged into another refrigerant system
unless it has been cleaned and checked.
WARNING
If compressor is to be removed, ensure that the compressor has been evacuated to
an acceptable level to make sure that flammable refrigerant does NOT remain within
the lubricant. The evacuation process MUST be carried out prior to returning the
compressor to the supplier. During the refrigerant recovery, confirm that the
crankcase heater of the compressor body is energized to accelerate this process.
When oil is drained from a system, it MUST be carried out safely.
WARNING
Make sure the ventilation machinery and outlets are operating adequately and are
NOT obstructed.

1 | Safety precautions
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1.4 Cautions
CAUTION
Wear adequate personal protective equipment (protective gloves, safety glasses,…)
when installing, maintaining or servicing the system.
CAUTION
To avoid injury, do NOT touch the air inlet or aluminium fins of the unit.
CAUTION
▪Do NOT place any objects or equipment on top of the unit.
▪Do NOT sit, climb or stand on the unit.
1.5 Notices
NOTICE
▪Make sure water quality complies with EU directive 2020/2184.
▪Check the system for leaks after each repair/modification of the water side.
▪Check drainage system(s) after repairs.
▪Be careful when tilting units as water may leak.
NOTICE
Make sure refrigerant piping installation complies with applicable legislation. In
Europe, EN378 is the applicable standard.
NOTICE
Make sure the field piping and connections are NOT subjected to stress.

2 | General operation
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2 General operation
The High temperature split (Top Grade) is a Heat Pump used for cooling and/or
heating in residential applications.
Outdoor units
The outdoor unit consists of:
▪Inverter compressor
▪A switchbox containing necessary PCBs
▪An air cooled heat-exchanger
▪2 expansion valves (main, and injection)
▪Fan motor
▪2 water piping connections (Water IN and Water Out)
Heating mode
The compressor capacity step is defined by the condensing temperature, which is
calculated through the high pressure sensor read-out.
In defrost or oil return operation the heat exchanger functions as a condenser,
while its fan motor and the fan motor of the operational indoor units (if applicable)
are stopped.
Cooling mode
The compressor capacity step is defined by the evaporation temperature, which is
calculated through the low pressure sensor read-out.

2 | General operation
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Indoor units
Below list is only for reference for compatible units. Always refer to the
Engineering Databook for compatibility.
Floorstanding
HPSU ETSH/X
Floorstanding heat
pump convector
FWXV
Wall mounted heat
pump convector
FWXT
Concealed heat
pump convector
FWXM

3 | Troubleshooting
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3 Troubleshooting
3.1 To display the help text in case of a malfunction
In case of a malfunction, the following will appear on the home screen depending
on the severity:
▪: Error
▪: Malfunction
You can get a short and a long description of the malfunction as follows:
1Press the left dial to open the main menu and go to
Malfunctioning.
Result: A short description of the error and the error code is
displayed on the screen.
2Press in the error screen.
Result: A long description of the error is displayed on the
screen.
3.2 To reset the error code
1Display the help text of the error, see "3.1To display the help text in case of a
malfunction"[418].
1Press the left dial to open the menu and go to Reset.
2Press the left dial to reset the error.
Result: The error has been reset.

3 | Troubleshooting
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3.3 To check the malfunction history
Conditions: The user permission level is set to advanced end user.
1Go to [8.2]: Information > Malfunction history.
You see a list of the most recent malfunctions.
3.4 To check the running hours of the system
1Go to [8.9]: Information > Running hours.
You see a list of the running hours of the components.

3 | Troubleshooting
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3.5 Error based troubleshooting
INFORMATION
When power reset of the unit is needed:
In case the indoor unit has a separate power supply, also reset the power of the
indoor unit.
3.5.1 7H-01 – Water flow problem
Trigger Effect Reset
System detects flow
abnormality during
operation.
Unit will stop operating. Automatic reset.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1Check that all stop valves of the water circuit are open. See "5.3 Water
circuit"[4377].
Possible cause: Closed stop valve in the water circuit.
2Purge the water circuit. See "5.3Water circuit"[4377].
Possible cause: Air in the water circuit.
3Check the water flow. See "5.3Water circuit"[4377].
Possible cause: Water flow is too low.
4Check the water pressure. See "5.3Water circuit"[4377].
Possible cause: Water pressure is too low.
5Check if a by‑pass is installed in the water circuit. See "5.3 Water
circuit"[4377].
Possible cause: No by‑pass installed in the water circuit.
6Clean the integrated filter of the shut‑off valve. See "6Maintenance"[4389].
Possible cause: Dirty filter in the shut‑off valve.
7Clean the water filter. See "5.4Manufacturer components"[4386].
Possible cause: Clogged water filter.
8Perform an electrical check of the water flow sensor. See "4.25 Water flow
sensor"[4344].
Possible cause: Faulty water flow sensor.
9Perform a check of both 3-way valves. See "4.13-way valve"[4108].
Possible cause: Faulty 3‑way valve(s).
10 Perform a check of the water pump. See "4.27Water pump"[4352].
Possible cause: Faulty water pump.
11 Perform a check of the hydro PCB. See "4.11Hydro PCB"[4193].
Possible cause: Faulty hydro PCB.