Daikin RXJ20A5V1B User manual

Service manual
Split Emura 3 R32
RXJ20A5V1B
RXJ25A5V1B
RXJ35A5V1B
RXJ42A2V1B
RXJ50A2V1B
FTXJ20A2V1BW
FTXJ25A2V1BW
FTXJ35A2V1BW
FTXJ42A2V1BW
FTXJ50A2V1BW
FTXJ20A2V1BS
FTXJ25A2V1BS
FTXJ35A2V1BS
FTXJ42A2V1BS
FTXJ50A2V1BS
FTXJ20A2V1BB
FTXJ25A2V1BB
FTXJ35A2V1BB
FTXJ42A2V1BB
FTXJ50A2V1BB

Disclaimer
Service manual
2
RXJ20~50A + FTXJ-A(W)(S)(B)
Split Emura 3 R32
ESIE22-04B – 2022.08
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
RXJ20~50A + FTXJ-A(W)(S)(B)
Split Emura 3 R32
ESIE22-04B – 2022.08
Version log
Version code Description Date
ESIE22-04 Document release June 2022
ESIE22-04A See below August 2022
The following updates have been applied to the Service Manual:
•Technical data – Field settings indoor unit: To retrieve the field settings via the wireless remote controller
ARC488A1 updated.
•Technical data – Field settings indoor unit: Overview of field settings for indoor units updated.
Version code Description Date
ESIE22-04B See below August 2022
The following updates have been applied to the Service Manual:
•Troubleshooting: To reset the error code via the remote controller updated.

Table of Contents
Service manual
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RXJ20~50A + FTXJ-A(W)(S)(B)
Split Emura 3 R32
ESIE22-04B – 2022.08
Table of Contents
1 Safety precautions 7
1.1 Meaning of warnings and symbols................................................................................................................................. 7
1.2 Dangers ........................................................................................................................................................................... 8
1.3 Warnings ......................................................................................................................................................................... 8
1.4 Cautions .......................................................................................................................................................................... 14
1.5 Notices ............................................................................................................................................................................ 14
2 General operation 15
3 Troubleshooting 16
3.1 To display the error code on the wireless remote controller........................................................................................ 16
3.2 To reset the error code via remote controller ............................................................................................................... 16
3.3 To reset the error code via outdoor unit ....................................................................................................................... 17
3.4 To perform a test run...................................................................................................................................................... 18
3.4.1 To perform a test run using the wireless remote control ............................................................................. 18
3.5 Error based troubleshooting........................................................................................................................................... 19
3.5.1 A1-00 – PCB abnormality ............................................................................................................................... 19
3.5.2 A5-00 – Outdoor unit: High pressure peak cut / freeze protection problem ............................................... 20
3.5.3 A6-00 – Indoor unit fan motor abnormality .................................................................................................. 21
3.5.4 AH-00 – Streamer unit abnormality............................................................................................................... 21
3.5.5 C4-00 – Heat exchanger temperature sensor problem................................................................................. 22
3.5.6 C9-00 – Room thermistor abnormality.......................................................................................................... 22
3.5.7 CC-00 – Humidity sensor abnormality ........................................................................................................... 23
3.5.8 CE-00 – Intelligent thermal sensor abnormality............................................................................................ 23
3.5.9 E1-00 – Outdoor unit: PCB defect.................................................................................................................. 23
3.5.10 E3-00 – Outdoor unit: Actuation of high pressure switch............................................................................. 25
3.5.11 E5-00 – Outdoor unit: Overheat of inverter compressor motor................................................................... 26
3.5.12 E6-00 – Outdoor unit: Compressor startup defect........................................................................................ 27
3.5.13 E7-00 – Outdoor unit: Malfunction of outdoor unit fan motor .................................................................... 28
3.5.14 E8-00 – Outdoor unit: Power input overvoltage ........................................................................................... 28
3.5.15 EA-00 – Outdoor unit: Cool/heat switchover problem ................................................................................. 29
3.5.16 F3-00 – Outdoor unit: Malfunction of discharge pipe temperature............................................................. 30
3.5.17 F6-00 – Outdoor unit: Abnormal high pressure in cooling............................................................................ 31
3.5.18 F8-00 – System shutdown due to compressor internal temperature abnormality...................................... 31
3.5.19 H0-00 – Outdoor unit: Voltage/current sensor problem .............................................................................. 32
3.5.20 H3-00 – Outdoor unit: Malfunction of high pressure switch ........................................................................ 33
3.5.21 H6-00 – Outdoor unit: Malfunction of position detection sensor ................................................................ 34
3.5.22 H8-00 – Outdoor unit: Malfunction of compressor input system................................................................. 35
3.5.23 H9-00 – Outdoor unit: Malfunction of outdoor air thermistor ..................................................................... 35
3.5.24 J3-00 – Outdoor unit: Malfunction of discharge pipe thermistor ................................................................. 36
3.5.25 J6-00 – Outdoor unit: Malfunction of heat exchanger thermistor ............................................................... 36
3.5.26 L3-00 – Outdoor unit: Electrical box temperature rise problem................................................................... 36
3.5.27 L4-00 – Outdoor unit: Malfunction of inverter radiating fin temperature rise ............................................ 37
3.5.28 L5-00 – Outdoor unit: Inverter instantaneous overcurrent .......................................................................... 38
3.5.29 P4-00 – Outdoor unit: Malfunction of radiating fin temperature sensor ..................................................... 39
3.5.30 U0-00 – Outdoor unit: Shortage of refrigerant ............................................................................................. 39
3.5.31 U2-00 – Outdoor unit: Defect of power supply voltage ................................................................................ 40
3.5.32 U4-00 – Indoor/outdoor unit communication problem................................................................................ 41
3.5.33 U5-00 – Communication abnormality between indoor unit main PCB and remote controller ................... 42
3.5.34 UA-00 – Indoor unit, outdoor unit mismatching problem ............................................................................ 43
3.5.35 UH-00 – Malfunction of system ..................................................................................................................... 44
3.6 Symptom based troubleshooting ................................................................................................................................... 45
3.6.1 Operation does not start................................................................................................................................ 45
3.6.2 Operation sometimes stops ........................................................................................................................... 45
3.6.3 Operation starts but the unit does not cool/heat ......................................................................................... 46
3.6.4 Operating noise and vibrations...................................................................................................................... 47
3.6.5 Abnormal high pressure ................................................................................................................................. 48
3.6.6 Abnormal low pressure .................................................................................................................................. 49
3.6.7 Indoor fan starts operating but the compressor does not operate.............................................................. 50
3.6.8 Operation starts and the unit stops immediately.......................................................................................... 51
3.6.9 Operation stops, unit cannot start for a while .............................................................................................. 51
3.6.10 Unit discharges white mist ............................................................................................................................. 52
3.6.11 Humidifying problem...................................................................................................................................... 52
3.6.12 Swing flap does not operate .......................................................................................................................... 52

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Split Emura 3 R32
ESIE22-04B – 2022.08
4 Components 53
4.1 4-way valve...................................................................................................................................................................... 53
4.1.1 Checking procedures...................................................................................................................................... 53
4.1.2 Repair procedures .......................................................................................................................................... 57
4.2 Compressor ..................................................................................................................................................................... 62
4.2.1 Checking procedures...................................................................................................................................... 62
4.2.2 Repair procedures .......................................................................................................................................... 68
4.3 Compressor thermal protector....................................................................................................................................... 77
4.3.1 Checking procedures...................................................................................................................................... 77
4.3.2 Repair procedures .......................................................................................................................................... 79
4.4 Expansion valve............................................................................................................................................................... 82
4.4.1 Checking procedures...................................................................................................................................... 82
4.4.2 Repair procedures .......................................................................................................................................... 86
4.5 Front panel motor........................................................................................................................................................... 90
4.5.1 Checking procedures...................................................................................................................................... 90
4.5.2 Repair procedures .......................................................................................................................................... 92
4.6 High pressure switch....................................................................................................................................................... 95
4.6.1 Checking procedures...................................................................................................................................... 95
4.6.2 Repair procedures .......................................................................................................................................... 96
4.7 Humidity sensor .............................................................................................................................................................. 98
4.7.1 Checking procedures...................................................................................................................................... 98
4.7.2 Repair procedures .......................................................................................................................................... 99
4.8 Indoor unit fan motor ..................................................................................................................................................... 101
4.8.1 Checking procedures...................................................................................................................................... 101
4.8.2 Repair procedures .......................................................................................................................................... 102
4.9 Indoor unit main PCB...................................................................................................................................................... 103
4.9.1 Checking procedures...................................................................................................................................... 103
4.9.2 Repair procedures .......................................................................................................................................... 106
4.10 Indoor unit power PCB.................................................................................................................................................... 108
4.10.1 Checking procedures ...................................................................................................................................... 108
4.10.2 Repair procedures .......................................................................................................................................... 111
4.11 Intelligent thermal sensor............................................................................................................................................... 114
4.11.1 Checking procedures ...................................................................................................................................... 114
4.11.2 Repair procedures .......................................................................................................................................... 115
4.12 Main PCB......................................................................................................................................................................... 117
4.12.1 Class 20~35 units ............................................................................................................................................ 117
4.12.2 Class 42+50 units ............................................................................................................................................ 126
4.13 Outdoor unit fan motor.................................................................................................................................................. 134
4.13.1 Class 20~35 units ............................................................................................................................................ 134
4.13.2 Class 42+50 units ............................................................................................................................................ 138
4.14 Plate work ....................................................................................................................................................................... 144
4.14.1 Outdoor unit ................................................................................................................................................... 144
4.14.2 Indoor unit ...................................................................................................................................................... 149
4.15 Reactor ............................................................................................................................................................................ 156
4.15.1 Checking procedures ...................................................................................................................................... 156
4.15.2 Repair procedures .......................................................................................................................................... 159
4.16 Streamer unit .................................................................................................................................................................. 159
4.16.1 Checking procedures ...................................................................................................................................... 159
4.16.2 Repair procedures .......................................................................................................................................... 159
4.17 Swing flap motor............................................................................................................................................................. 161
4.17.1 Main swing flap motor ................................................................................................................................... 161
4.17.2 Secondary swing flap motor........................................................................................................................... 164
4.18 Swing raster motor ......................................................................................................................................................... 168
4.18.1 Checking procedures ...................................................................................................................................... 168
4.18.2 Repair procedures .......................................................................................................................................... 169
4.19 Thermistors ..................................................................................................................................................................... 169
4.19.1 Checking procedures ...................................................................................................................................... 169
4.19.2 Repair procedures .......................................................................................................................................... 173
4.20 Wifi control PCB .............................................................................................................................................................. 176
4.20.1 Checking procedures ...................................................................................................................................... 176
4.20.2 Repair procedures .......................................................................................................................................... 177
5 Third party components 180
5.1 Electrical circuit............................................................................................................................................................... 180
5.1.1 Checking procedures...................................................................................................................................... 180
5.1.2 Repair procedures .......................................................................................................................................... 181
5.2 Refrigerant circuit ........................................................................................................................................................... 182
5.2.1 Checking procedures...................................................................................................................................... 182
5.2.2 Repair procedures .......................................................................................................................................... 187

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Service manual
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Split Emura 3 R32
ESIE22-04B – 2022.08
5.3 External factors ............................................................................................................................................................... 192
5.3.1 Checking procedures...................................................................................................................................... 192
6 Maintenance 193
6.1 To clean the outdoor unit heat exchanger..................................................................................................................... 193
6.2 To clean the indoor unit heat exchanger ....................................................................................................................... 193
6.3 To clean the indoor unit heat exchanger in extreme condition .................................................................................... 194
6.4 To clean the indoor unit and wireless remote control .................................................................................................. 194
6.5 To clean the front panel ................................................................................................................................................. 195
6.6 To clean the air filters ..................................................................................................................................................... 195
6.7 To clean the titanium apatite deodorising filter and the silver particle filter (Ag-ion filter)......................................... 196
6.8 To replace the titanium apatite deodorising filter and the silver particle filter (Ag-ion filter) ..................................... 197
7 Technical data 198
7.1 Detailed information setting mode ................................................................................................................................ 198
7.1.1 Detailed information setting mode: Indoor unit ........................................................................................... 198
7.1.2 Detailed information setting mode: Outdoor unit ........................................................................................ 198
7.1.3 Detailed information setting mode: Remote controller................................................................................ 198
7.2 Wiring diagram................................................................................................................................................................ 199
7.2.1 Wiring diagram: Indoor unit........................................................................................................................... 199
7.2.2 Wiring diagram: Outdoor unit........................................................................................................................ 203
7.3 Piping diagram ................................................................................................................................................................ 207
7.3.1 Piping diagram: Indoor unit............................................................................................................................ 207
7.3.2 Piping diagram: Outdoor unit......................................................................................................................... 209
7.4 Component overview...................................................................................................................................................... 211
7.4.1 Component overview: Outdoor unit.............................................................................................................. 211
7.4.2 Component overview: Indoor unit................................................................................................................. 213
7.5 Field information report ................................................................................................................................................. 214
7.6 Service tools .................................................................................................................................................................... 217
7.7 Field settings ................................................................................................................................................................... 218
7.7.1 Field settings: Indoor unit .............................................................................................................................. 218
7.7.2 Field settings: Outdoor unit ........................................................................................................................... 221

1 | Safety precautions
Service manual
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RXJ20~50A + FTXJ-A(W)(S)(B)
Split Emura 3 R32
ESIE22-04B – 2022.08
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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RXJ20~50A + FTXJ-A(W)(S)(B)
Split Emura 3 R32
ESIE22-04B – 2022.08
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.
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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RXJ20~50A + FTXJ-A(W)(S)(B)
Split Emura 3 R32
ESIE22-04B – 2022.08
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
children, can play with them. Possible risk: 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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RXJ20~50A + FTXJ-A(W)(S)(B)
Split Emura 3 R32
ESIE22-04B – 2022.08
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
Service manual
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RXJ20~50A + FTXJ-A(W)(S)(B)
Split Emura 3 R32
ESIE22-04B – 2022.08
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.

1 | Safety precautions
Service manual
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RXJ20~50A + FTXJ-A(W)(S)(B)
Split Emura 3 R32
ESIE22-04B – 2022.08
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
Service manual
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RXJ20~50A + FTXJ-A(W)(S)(B)
Split Emura 3 R32
ESIE22-04B – 2022.08
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.

1 | Safety precautions
Service manual
14
RXJ20~50A + FTXJ-A(W)(S)(B)
Split Emura 3 R32
ESIE22-04B – 2022.08
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
Service manual
15
RXJ20~50A + FTXJ-A(W)(S)(B)
Split Emura 3 R32
ESIE22-04B – 2022.08
2 General operation
The Split Emura 3 is typically used for cooling or heating in residential applications.
The medium which is used to transfer the heat from inside to outside or vice versa,
is refrigerant R32.
d
b
a
c
e
f
f
aCompressor
bIndoor heat exchanger
cExpansion valve
dOutdoor heat exchanger
e4‑way valve
fStop valves
In case of cooling, the compressor builds up pressure and hence the temperature
of the refrigerant is increased. The hot refrigerant is carried to the outdoor heat
exchanger which will cool down the hot refrigerant by the fan.
The temperature of the refrigerant is further decreased by expansion through the
expansion valve. The cold refrigerant flows into the indoor unit and is capable of
taking up heat again. This is enabled by a fan that sucks indoor air over the heat
exchanger.
This refrigerant is then transported to the compressor where temperature is built
up again and the cycle restarts.
For heating, it's just the other way round.
INFORMATION
Some of the indoor unit models CAN be used as Multi application as well. For further
general operation, please consult Multi Split service manual.

3 | Troubleshooting
Service manual
16
RXJ20~50A + FTXJ-A(W)(S)(B)
Split Emura 3 R32
ESIE22-04B – 2022.08
3 Troubleshooting
3.1 To display the error code on the wireless remote controller
1Press to enter the main menu and navigate to the wireless remote control
settings menu using and .
Wireless remote control setting menu Software version (self-diagnosis menu)
2Press to enter the menu.
3Navigate to the software and version screen using and .
4Keep pressed for at least 5seconds to enter the self-diagnosis menu.
5Navigate to the error code indication screen using and . Press to
confirm your selection.
Error code indication Error code list
1
00
6Aim the wireless remote control at the unit and scroll through the list of error
codes using and , until you hear a long beep.
Result: A long beep indicates the corresponding error code.
7Press to return to the home screen or press to return to the self-
diagnosis menu.
3.2 To reset the error code via remote controller
1Press button.
Result: Main menu is entered.
2Navigate to the wireless remote control setting menu using and .
Wireless remote control setting menu
3Press to confirm.
Result: Setting menu is entered.
4Navigate to the software and version menu using and .

3 | Troubleshooting
Service manual
17
RXJ20~50A + FTXJ-A(W)(S)(B)
Split Emura 3 R32
ESIE22-04B – 2022.08
Software and version menu
5Keep pressed for at least 5seconds.
Result: Software and version menu is entered.
6Navigate to the self‑diagnosis menu using and .
Self‑diagnosis menu
7Keep pressed for at least 5seconds.
Result: Self‑diagnosis menu is entered.
8Enter password 5902 using , , and .
9Press to confirm password.
10 Navigate to the Inspection mode menu using and .
Inspection mode menu
11 Press to confirm.
Result: Inspection mode menu is entered.
12 The correct error code can be found as follows:
▪Using and , change the first character of the error code until the user
interface sounds a double beep. 1 short beep will sound on every / .
▪Using and , select the secondary character of the error code.
▪Using and , change the secondary character of the error code until the
user interface sounds a long beep. 2 short beeps will sound on every / .
Inspection mode setting
C 0
13 Keep pressed for 3seconds.
Result: Error code is reset.
3.3 To reset the error code via outdoor unit
Prerequisite: Problem is solved.
1Perform a power reset to reset the error code.

3 | Troubleshooting
Service manual
18
RXJ20~50A + FTXJ-A(W)(S)(B)
Split Emura 3 R32
ESIE22-04B – 2022.08
3.4 To perform a test run
INFORMATION
If the unit runs into an error during commissioning, see the service manual for the
detailed troubleshooting guidelines.
Prerequisite: Power supply MUST be in the specified range.
Prerequisite: Test run may be performed in cooling or heating mode.
Prerequisite: Test run should be performed in accordance with the operation
manual of the indoor unit to make sure that all functions and parts are working
properly.
1In cooling mode, select the lowest programmable temperature. In heating
mode, select the highest programmable temperature. Test run can be
disabled if necessary.
2When the test run is finished, set the temperature to a normal level. In cooling
mode: 26~28°C, in heating mode: 20~24°C.
3The system stops operating 3minutes after the unit is turned OFF.
INFORMATION
▪Even if the unit is turned OFF, it consumes electricity.
▪When the power turns back on after a power break, the previously selected
mode will be resumed.
3.4.1 To perform a test run using the wireless remote control
1Press to enter main menu and navigate to “Wireless remote control
settings menu” by and . Press to enter menu.
2Navigate to “Software and version” screen by and .
3Keep pressed for at least 5seconds to enter “Self-diagnosis menu”.
Wireless remote control setting menu Self-diagnosis menu
4In the "Self-diagnosis menu", navigate to "Test run menu" by and .
Test run menu
5Press to enter the menu.
6Change status to ON by and .
7Press to confirm the selection.
Result: The indoor unit enter test run mode, during which normal operation is
not possible.

3 | Troubleshooting
Service manual
19
RXJ20~50A + FTXJ-A(W)(S)(B)
Split Emura 3 R32
ESIE22-04B – 2022.08
Test run OFF Test run ON During test run
Result: Test run operation will stop automatically after about 30minutes.
8Test run mode will stop if the ON/OFF button is pressed.
Result: The indoor units leave test operation mode.
9Check the function of operation modes.
INFORMATION
You CANNOT set the Econo, Outdoor unit silent and Powerful operation or change
the temperature setpoint during the test run.
10 Check the error code history. If required, solve the cause of the errors and
perform the test operation again.
INFORMATION
▪The test run is only completed if the indoor unit does not report any error code.
▪See the service manual for the complete list of error codes and a detailed
troubleshooting guideline for each error.
3.5 Error based troubleshooting
3.5.1 A1-00 – PCB abnormality
Trigger Effect Reset
The system CANNOT set
the internal settings.
Unit will stop operating. Power reset via outdoor
unit.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1Check for improper combination of the indoor unit and the outdoor unit. See
the combination table in the Databook for more information.
2Perform a check of the power supply, connections, wiring,… between the
outdoor unit and the indoor unit. See "5.1Electrical circuit"[4180].
Possible cause: Faulty wiring between the outdoor unit and the indoor unit.
3Check if the power supply is compliant with the regulations. See "5.1Electrical
circuit"[4180].
Possible cause:
▪Faulty or disturbance of the power supply (power supply MUST be within
range of nominal operating voltage ±4%),
▪Power drop,
▪Short circuit.

3 | Troubleshooting
Service manual
20
RXJ20~50A + FTXJ-A(W)(S)(B)
Split Emura 3 R32
ESIE22-04B – 2022.08
4Perform a check of the indoor unit main PCB. See "4.9 Indoor unit main
PCB"[4103].
Possible cause: Faulty indoor unit main PCB.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
3.5.2 A5-00 – Outdoor unit: High pressure peak cut / freeze protection problem
Trigger Effect Reset
During cooling operation,
indoor heat exchanger
temperature is below 0°C
(freeze‑up protection
control).
Unit will stop operating. Automatic reset when
temperature is within
range.
During heating operation,
indoor heat exchanger
temperature is above
65°C (heating peak‑cut
control).
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1Check for objects near the indoor unit that may block the airflow. See
"5.3External factors"[4192].
Possible cause: Airflow of the indoor unit is blocked.
2Clean the air filter of the indoor unit(s). See "6Maintenance"[4193].
Possible cause: Faulty or dirty air filter.
3Clean the indoor unit heat exchanger. See "6Maintenance"[4193].
Possible cause: Dirty indoor unit heat exchanger.
4Perform a check of the indoor unit heat exchanger thermistor. See
"4.19Thermistors"[4169].
Possible cause: Faulty indoor unit heat exchanger thermistor.
5Perform a check of the indoor unit main PCB. See "4.9 Indoor unit main
PCB"[4103].
Possible cause: Faulty indoor unit main PCB.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.