Daikin Comfora FTXP20~71L2V1B User manual

Service manual
Split Comfora R32 English
Service manual
Split Comfora R32
FTXP20~71L2V1B
ATXP20~35L2V1B
RXP20~71L2V1B
ARXP20~35L2V1B

Disclaimer
Service manual
2
ATXP20~35L2V1B + FTXP20~71L2V1B + ARXP20~35L2V1B +
RXP20~71L2V1B
Split Comfora R32
ESIE18-01 – 2019.02
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..

Table of contents
Service manual
3
ATXP20~35L2V1B + FTXP20~71L2V1B + ARXP20~35L2V1B +
RXP20~71L2V1B
Split Comfora R32
ESIE18-01 – 2019.02
Table of contents
1 Troubleshooting 4
1.1 To display the error code on the user interface......................... 4
1.2 To reset the error code via remote controller ............................ 4
1.3 To reset the error code via outdoor unit .................................... 4
1.4 To perform a test run................................................................. 4
1.4.1 To perform a test run in winter season ....................... 4
1.5 Error based troubleshooting ...................................................... 4
1.5.1 A1-00 – PCB abnormality ........................................... 4
1.5.2 A5-00 – Freeze-up protection / heating peak cut
control ......................................................................... 4
1.5.3 A6-00 – Indoor unit fan motor abnormality.................. 5
1.5.4 C4-00 – Indoor heat exchanger thermistor
abnormality ................................................................. 5
1.5.5 C9-00 – Room thermistor abnormality ........................ 5
1.5.6 E1-00 – PCB defect .................................................... 5
1.5.7 E3-00 – High pressure switch abnormality ................. 6
1.5.8 E5-00 – Overheat of inverter compressor motor......... 6
1.5.9 E6-00 – Compressor startup defect............................ 6
1.5.10 E7-00 – Fan lock abnormality ..................................... 7
1.5.11 E8-00 – Input overvoltage abnormality ....................... 7
1.5.12 EA-00 – Cooling/Heating switch abnormality.............. 7
1.5.13 F3-00 – Discharge pipe temperature stop
abnormality ................................................................. 7
1.5.14 F6-00 – Stop due to cooling high pressure ................. 8
1.5.15 F8-00 – System shutdown due to compressor
internal temperature abnormality ................................ 8
1.5.16 H0-00 – Current sensor abnormality........................... 8
1.5.17 H3-00 – High pressure switch defect .......................... 9
1.5.18 H6-00 – Location detection sensor abnormality.......... 9
1.5.19 H8-00 – Compressor input abnormality ...................... 9
1.5.20 H9-00 – Outdoor air thermistor abnormality................ 10
1.5.21 J3-00 – Discharge pipe thermistor dislocation
abnormality ................................................................. 10
1.5.22 J6-00 – Outdoor heat exchanger thermistor
abnormality ................................................................. 10
1.5.23 L3-00 – Electrical component temperature
abnormality ................................................................. 10
1.5.24 L4-00 – Fin temperature increase abnormality ........... 10
1.5.25 L5-00 – Output over current abnormality .................... 11
1.5.26 P4-00 – Fin thermistor abnormality............................. 11
1.5.27 U0-00 – Shortage of refrigerant .................................. 11
1.5.28 U2-00 – Main circuit voltage abnormality.................... 12
1.5.29 U4-00 – Indoor/outdoor transmission abnormality ...... 12
1.5.30 UA-00 – Indoor/outdoor combination abnormality ...... 12
1.6 Symptom based troubleshooting............................................... 14
1.6.1 Operation does not start ............................................. 14
1.6.2 Operation sometimes stops ........................................ 14
1.6.3 Operation starts but the unit does not cool/heat ......... 14
1.6.4 Operating noise and vibrations ................................... 15
1.6.5 Abnormal high pressure.............................................. 15
1.6.6 Abnormal low pressure ............................................... 15
1.6.7 Indoor fan starts operating but the compressor does
not operate.................................................................. 16
1.6.8 Operation starts and the unit stops immediately......... 16
1.6.9 Operation stops, unit cannot start for a while.............. 16
1.6.10 Unit discharges white mist .......................................... 16
1.6.11 Swing flap does not operate ....................................... 17
2 Components 18
2.1 4-way valve ............................................................................... 18
2.1.1 Checking procedures .................................................. 18
2.1.2 Repair procedures ...................................................... 19
2.2 Compressor............................................................................... 20
2.2.1 Checking procedures .................................................. 20
2.2.2 Repair procedures ...................................................... 22
2.3 Expansion valve ........................................................................ 23
2.3.1 Checking procedures ................................................... 23
2.3.2 Repair procedures ....................................................... 24
2.4 High pressure switch .................................................................. 26
2.4.1 Checking procedures ................................................... 26
2.4.2 Repair procedures ....................................................... 26
2.5 Indoor unit fan motor .................................................................. 27
2.5.1 Checking procedures ................................................... 27
2.5.2 Repair procedures ....................................................... 28
2.6 Indoor unit PCB .......................................................................... 29
2.6.1 Checking procedures ................................................... 29
2.6.2 Repair procedures ....................................................... 30
2.7 Inverter PCB............................................................................... 31
2.7.1 Checking procedures ................................................... 31
2.7.2 Repair procedures ....................................................... 32
2.8 Main PCB ................................................................................... 32
2.8.1 Checking procedures ................................................... 32
2.8.2 Repair procedures ....................................................... 33
2.9 Outdoor unit fan motor ............................................................... 34
2.9.1 Checking procedures ................................................... 34
2.9.2 Repair procedures ....................................................... 35
2.10 Plate work................................................................................... 35
2.10.1 Outdoor unit ................................................................. 35
2.10.2 Indoor unit .................................................................... 38
2.11 Reactor ....................................................................................... 40
2.11.1 Checking procedures ................................................... 40
2.11.2 Repair procedures ....................................................... 40
2.12 Swing flap motor......................................................................... 41
2.12.1 Checking procedures ................................................... 41
2.12.2 Repair procedures ....................................................... 41
2.13 Thermistors ................................................................................ 41
2.13.1 Refrigerant thermistors ................................................ 42
2.13.2 Other thermistors ......................................................... 44
3 Third party components 44
3.1 Power supply.............................................................................. 44
3.1.1 Checking procedures ................................................... 44
3.1.2 Repair procedures ....................................................... 44
3.2 Refrigerant circuit ....................................................................... 45
3.2.1 Checking procedures ................................................... 45
3.2.2 Repair procedures ....................................................... 46
3.3 External factors .......................................................................... 47
3.3.1 Checking procedures ................................................... 47
3.3.2 Repair procedures ....................................................... 47
4 Maintenance 48
4.1 To clean the outdoor unit heat exchanger.................................. 48
4.2 To clean the indoor unit heat exchanger .................................... 48
4.3 To clean the air filters ................................................................. 48
5 Technical data 49
5.1 Detailed information setting mode.............................................. 49
5.1.1 Detailed information setting mode: Indoor unit ............ 49
5.1.2 Detailed information setting mode: Outdoor unit.......... 49
5.1.3 Detailed information setting mode: Remote controller . 49
5.2 Wiring diagram ........................................................................... 50
5.2.1 Wiring diagram: Indoor unit.......................................... 50
5.2.2 Wiring diagram: Outdoor unit ....................................... 51
5.3 Piping diagram ........................................................................... 52
5.3.1 Piping diagram: Indoor unit .......................................... 52
5.3.2 Piping diagram: Outdoor unit ....................................... 54
5.4 Component overview.................................................................. 57
5.4.1 Component overview: Indoor unit ................................ 57
5.4.2 Component overview: Outdoor unit ............................. 58
5.5 Field information report .............................................................. 59
5.6 Service tools............................................................................... 62
5.7 Field settings .............................................................................. 63
5.7.1 Field settings: Indoor unit............................................. 63
5.7.2 Field settings: Outdoor unit .......................................... 64

1 Troubleshooting
Service manual
4
ATXP20~35L2V1B + FTXP20~71L2V1B + ARXP20~35L2V1B +
RXP20~71L2V1B
Split Comfora R32
ESIE18-01 – 2019.02
1 Troubleshooting
1.1 To display the error code on the
user interface
1Hold for about 5seconds.
Result: blinks in the temperature display section.
2Press repeatedly until a continuous beep is heard.
Result: The code is now displayed on the display.
INFORMATION
▪ A short beep and 2 consecutive beeps indicate non-
corresponding codes.
▪ To cancel the code display, hold the cancel
button for 5seconds. The code will also disappear from
the display if the button is NOT pressed within
1minute.
1.2 To reset the error code via remote
controller
Prerequisite: Problem is solved.
1Press the ON/OFF button of the remote controller to reset the
error.
1.3 To reset the error code via outdoor
unit
Prerequisite: Problem is solved.
1Perform a power reset to reset the error code.
1.4 To perform a test run
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.
1.4.1 To perform a test run in winter season
When operating the air conditioner in Cooling mode in winter, set it
to test run operation using the following method.
INFORMATION
Some of the functions CANNOT be used in the test run
operation mode.
If a power failure occurs during operation, the system automatically
restarts immediately after power is restored.
1.5 Error based troubleshooting
1.5.1 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 "3.1 Power
supply"on page44.
Possible cause: Faulty wiring between the outdoor unit and
the indoor unit.
3Check if the power supply is conform with the regulations. See
"3.1Power supply"on page44.
Possible cause:
▪ Faulty or disturbance of the power supply (imbalance
>10%),
▪ Power drop,
▪ Short circuit.
4Perform a check of the indoor unit PCB. See "2.6 Indoor unit
PCB"on page29.
Possible cause: Faulty indoor unit PCB.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
1.5.2 A5-00 – Freeze-up protection / heating
peak cut control
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 "3.3External factors"on page47.
Possible cause: Airflow of the indoor unit is blocked.
2Clean the air filter. See "4Maintenance"on page48.
Possible cause: Faulty or dirty air filter.

1 Troubleshooting
Service manual
5
ATXP20~35L2V1B + FTXP20~71L2V1B + ARXP20~35L2V1B +
RXP20~71L2V1B
Split Comfora R32
ESIE18-01 – 2019.02
3Clean the indoor unit heat exchanger. See "4Maintenance"on
page48.
Possible cause: Dirty indoor unit heat exchanger.
4Perform a check of the indoor unit heat exchanger thermistor.
See "2.13Thermistors"on page41.
Possible cause: Faulty indoor unit heat exchanger
thermistor.
5Perform a check of the indoor unit PCB. See "2.6 Indoor unit
PCB"on page29.
Possible cause: Faulty indoor unit PCB.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
1.5.3 A6-00 – Indoor unit fan motor abnormality
Trigger Effect Reset
The rotation speed of
the fan motor is NOT
detected while the
output voltage to the
fan is at its maximum.
Unit will stop
operating.
Power reset via the
outdoor unit.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed
order.
1Perform a check of the indoor unit PCB. See "2.6 Indoor unit
PCB"on page29.
Possible cause: Faulty indoor unit PCB.
2Perform a check of the indoor unit fan motor. See "2.5 Indoor
unit fan motor"on page27.
Possible cause: Faulty indoor unit fan motor.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
1.5.4 C4-00 – Indoor heat exchanger thermistor
abnormality
Trigger Effect Reset
Refrigerant liquid
thermistor detects an
open or short circuit
during compressor
operation.
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.
INFORMATION
In case of preferential kWh rate, the indoor unit also needs
a power reset.
1Perform a check of the refrigerant liquid thermistor. See
"2.13Thermistors"on page41.
Possible cause: Faulty refrigerant liquid thermistor.
2Perform a check of the indoor unit PCB. See "2.6 Indoor unit
PCB"on page29.
Possible cause: Faulty indoor unit PCB.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
1.5.5 C9-00 – Room thermistor abnormality
Trigger Effect Reset
Resistance value is
out of range.
Temperature
measured <–43.6°C
or >90°C.
Unit will stop
operating.
Automatic reset when
resistance is within
range.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed
order.
1Perform a check of the room thermistor. See
"2.13Thermistors"on page41.
Possible cause: Faulty room thermistor.
2Perform a check of the indoor unit PCB. See "2.6 Indoor unit
PCB"on page29.
Possible cause: Faulty indoor unit PCB.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
1.5.6 E1-00 – PCB defect
Trigger Effect Reset
Main PCB detects
that EEPROM is
abnormal.
Unit will stop
operating.
Manual reset via user
interface.
Power reset via
outdoor unit.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed
order.
INFORMATION
In case of preferential kWh rate, the indoor unit also needs
a power reset.
1Perform a check of the main PCB. See "2.8 Main PCB" on
page32.
Possible cause: Faulty main PCB.
2Check if the power supply is conform with the regulations. See
"3.1Power supply"on page44.
Possible cause:
▪ Faulty or disturbance of the power supply (imbalance
>10%),
▪ Power drop,
▪ Short circuit.
3Perform a check of the outdoor unit fan motor. See
"2.9Outdoor unit fan motor"on page34.
Possible cause: Faulty outdoor unit fan motor.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.

1 Troubleshooting
Service manual
6
ATXP20~35L2V1B + FTXP20~71L2V1B + ARXP20~35L2V1B +
RXP20~71L2V1B
Split Comfora R32
ESIE18-01 – 2019.02
1.5.7 E3-00 – High pressure switch abnormality
Trigger Effect Reset
High pressure switch
opens due to
measured pressure
>41.7bar.
Unit will stop
operating.
Manual reset via user
interface.
High pressure control
(measured pressure
>38bar) occurs 16
times within
300minutes.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed
order.
1Perform a check of the high pressure switch. See "2.4 High
pressure switch"on page26.
Possible cause: Faulty high pressure switch.
2Perform a check of the main PCB. See "2.8 Main PCB" on
page32.
Possible cause: Faulty main PCB.
3Perform a check of the refrigerant circuit. See "3.2 Refrigerant
circuit"on page45.
Possible cause:
▪ Stop valve is closed,
▪ Clogged refrigerant circuit,
▪ Refrigerant circuit NOT charged correctly,
▪ Humidity in the refrigerant circuit,
▪ Non-condensables in the refrigerant circuit,
▪ Leaking refrigerant circuit.
4Perform a check of the outdoor unit fan motor. See
"2.9Outdoor unit fan motor"on page34.
Possible cause: Faulty outdoor unit fan motor.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
1.5.8 E5-00 – Overheat of inverter compressor
motor
Trigger Effect Reset
Compressor overload
is detected.
Unit will NOT stop
operating.
Automatic reset if the
unit runs without
warning for
60seconds.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed
order.
1Perform a check of the discharge pipe thermistor. See
"2.13Thermistors"on page41.
Possible cause: Faulty discharge pipe thermistor.
2Perform a check of the outdoor unit fan motor. See
"2.9Outdoor unit fan motor"on page34.
Possible cause: Faulty outdoor unit fan motor.
3Perform a check of the compressor. See "2.2Compressor"on
page20.
Possible cause: Faulty compressor.
4Perform a check of the expansion valve. See "2.3 Expansion
valve"on page23.
Possible cause: Faulty expansion valve.
5Perform a check of the 4‑way valve. See "2.1 4-way valve"on
page18.
Possible cause: Faulty 4‑way valve.
6Perform a check of the main PCB. See "2.8 Main PCB" on
page32.
Possible cause: Faulty main PCB.
7Perform a check of the inverter PCB. See "2.7Inverter PCB"on
page31.
Possible cause: Faulty power module = inverter PCB.
8Perform a check of the refrigerant circuit. See "3.2 Refrigerant
circuit"on page45.
Possible cause:
▪ Stop valve is closed,
▪ Clogged refrigerant circuit,
▪ Refrigerant circuit NOT charged correctly,
▪ Humidity in the refrigerant circuit,
▪ Non-condensables in the refrigerant circuit,
▪ Leaking refrigerant circuit.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
1.5.9 E6-00 – Compressor startup defect
Trigger Effect Reset
The motor rotor does
NOT rotate when the
compressor is
energized.
Unit will NOT stop
operating.
Automatic reset after
a continuous run for
10minutes.
Unit will stop
operating
Manual reset via user
interface.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed
order.
1Perform a check of the discharge pipe thermistor. See
"2.13Thermistors"on page41.
Possible cause: Faulty discharge pipe thermistor.
2Perform a check of the refrigerant circuit. See "3.2 Refrigerant
circuit"on page45.
Possible cause:
▪ Stop valve is closed,
▪ Clogged refrigerant circuit,
▪ Refrigerant circuit NOT charged correctly,
▪ Humidity in the refrigerant circuit,
▪ Non-condensables in the refrigerant circuit,
▪ Leaking refrigerant circuit.
3Perform a check of the compressor. See "2.2Compressor"on
page20.
Possible cause: Faulty compressor.
4Perform a check of the main PCB. See "2.8 Main PCB" on
page32.
Possible cause: Faulty main PCB.
5Perform a check of the inverter PCB. See "2.7Inverter PCB"on
page31.
Possible cause: Faulty power module = inverter PCB.

1 Troubleshooting
Service manual
7
ATXP20~35L2V1B + FTXP20~71L2V1B + ARXP20~35L2V1B +
RXP20~71L2V1B
Split Comfora R32
ESIE18-01 – 2019.02
6Perform a check of the 4‑way valve. See "2.1 4-way valve"on
page18.
Possible cause: Faulty 4‑way valve.
7Perform a check of the expansion valve. See "2.3 Expansion
valve"on page23.
Possible cause: Faulty expansion valve.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
1.5.10 E7-00 – Fan lock abnormality
Trigger Effect Reset
Fan does NOT start
15~30seconds after
ON signal.
It can occur that the
error code is
triggered when the
fan motor is running
caused by a faulty
rotating sensor
signal.
Unit will stop
operating.
Manual reset via user
interface.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed
order.
1Perform a check of the outdoor unit fan motor. See
"2.9Outdoor unit fan motor"on page34.
Possible cause: Faulty outdoor unit fan motor.
2Perform a check of the inverter PCB. See "2.7Inverter PCB"on
page31.
Possible cause: Faulty power module = inverter PCB.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
1.5.11 E8-00 – Input overvoltage abnormality
Trigger Effect Reset
Compressor running
current exceeds
standard value for
2.5seconds.
Unit will stop
operating.
Manual reset via user
interface.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed
order.
1Check the outdoor temperature. See "3.3 External factors" on
page47.
Possible cause: Outdoor temperature is out of operation
range.
2Perform a check of the compressor. See "2.2Compressor"on
page20.
Possible cause: Faulty compressor.
3Perform a check of the inverter PCB. See "2.7Inverter PCB"on
page31.
Possible cause: Faulty power module = inverter PCB.
4Check if the power supply is conform with the regulations. See
"3.1Power supply"on page44.
Possible cause:
▪ Faulty or disturbance of the power supply (imbalance
>10%),
▪ Power drop,
▪ Short circuit.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
1.5.12 EA-00 – Cooling/Heating switch
abnormality
Trigger Effect Reset
Room thermistor is
NOT functioning
within operation
range.
Unit will NOT stop
operating.
Automatic reset after
a continuous
operation of
10minutes.
If the error occurs too
soon: unit will stop
operating.
Manual reset via user
interface.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed
order.
1Perform a check of the 4‑way valve. See "2.1 4-way valve"on
page18.
Possible cause: Faulty 4‑way valve.
2Perform a check of the main PCB. See "2.8 Main PCB" on
page32.
Possible cause: Faulty main PCB.
3Perform a check of the room thermistor. See
"2.13Thermistors"on page41.
Possible cause: Faulty room thermistor.
4Perform a check of the refrigerant circuit. See "3.2 Refrigerant
circuit"on page45.
Possible cause:
▪ Stop valve is closed,
▪ Clogged refrigerant circuit,
▪ Refrigerant circuit NOT charged correctly,
▪ Humidity in the refrigerant circuit,
▪ Non-condensables in the refrigerant circuit,
▪ Leaking refrigerant circuit.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
1.5.13 F3-00 – Discharge pipe temperature stop
abnormality
Trigger Effect Reset
Discharge pipe
thermistor detects a
too high temperature.
Unit will NOT stop
operating.
Automatic reset when
temperature drops
normal level.
If the error re-occurs
too soon: unit will
stop operating.
Manual reset via user
interface.

1 Troubleshooting
Service manual
8
ATXP20~35L2V1B + FTXP20~71L2V1B + ARXP20~35L2V1B +
RXP20~71L2V1B
Split Comfora R32
ESIE18-01 – 2019.02
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed
order.
1Perform a check of the refrigerant circuit. See "3.2 Refrigerant
circuit"on page45.
Possible cause:
▪ Stop valve is closed,
▪ Clogged refrigerant circuit,
▪ Refrigerant circuit NOT charged correctly,
▪ Humidity in the refrigerant circuit,
▪ Non-condensables in the refrigerant circuit,
▪ Leaking refrigerant circuit.
2Perform a check of the 4‑way valve. See "2.1 4-way valve"on
page18.
Possible cause: Faulty 4‑way valve.
3Perform a check of the expansion valve. See "2.3 Expansion
valve"on page23.
Possible cause: Faulty expansion valve.
4Perform a check of the main PCB. See "2.8 Main PCB" on
page32.
Possible cause: Faulty main PCB.
5Perform a check of all refrigerant thermistors. See
"2.13Thermistors"on page41.
Possible cause: Faulty refrigerant thermistor(s).
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
1.5.14 F6-00 – Stop due to cooling high pressure
Trigger Effect Reset
Outdoor heat
exchanger thermistor
measures
temperature
>60°C~65°C
Unit will NOT stop
operating.
Automatic reset when
temperature drops
below 50°C.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed
order.
1Clean the outdoor heat exchanger. See "4 Maintenance" on
page48.
Possible cause: Dirty outdoor heat exchanger.
2Perform a check of the refrigerant circuit. See "3.2 Refrigerant
circuit"on page45.
Possible cause:
▪ Stop valve is closed,
▪ Clogged refrigerant circuit,
▪ Refrigerant circuit NOT charged correctly,
▪ Humidity in the refrigerant circuit,
▪ Non-condensables in the refrigerant circuit,
▪ Leaking refrigerant circuit.
3Perform a check of the heat exchanger thermistor. See
"2.13Thermistors"on page41.
Possible cause: Faulty heat exchanger thermistor.
4Perform a check of the expansion valve. See "2.3 Expansion
valve"on page23.
Possible cause: Faulty expansion valve.
5Perform a check of the main PCB. See "2.8 Main PCB" on
page32.
Possible cause: Faulty main PCB.
6Perform a check of the outdoor unit fan motor. See
"2.9Outdoor unit fan motor"on page34.
Possible cause: Faulty outdoor unit fan motor.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
1.5.15 F8-00 – System shutdown due to
compressor internal temperature
abnormality
Trigger Effect Reset
Temperature
discharge pipe
thermistor exceeds
the determined limit.
Unit will stop
operating.
Manual reset via user
interface.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed
order.
1Perform a check of the refrigerant circuit. See "3.2 Refrigerant
circuit"on page45.
Possible cause:
▪ Stop valve is closed,
▪ Clogged refrigerant circuit,
▪ Refrigerant circuit NOT charged correctly,
▪ Humidity in the refrigerant circuit,
▪ Non-condensables in the refrigerant circuit,
▪ Leaking refrigerant circuit.
2Perform a check of the discharge pipe thermistor. See
"2.13Thermistors"on page41.
Possible cause: Faulty discharge pipe thermistor.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
1.5.16 H0-00 – Current sensor abnormality
Trigger Effect Reset
Compressor voltage
(DC) is out of range
before start‑up.
Unit will stop
operating.
Manual reset via user
interface.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed
order.
1Perform a check of the main PCB. See "2.8 Main PCB" on
page32.
Possible cause: Faulty main PCB.
2Perform a check of the inverter PCB. See "2.7Inverter PCB"on
page31.
Possible cause: Faulty power module = inverter PCB.
3Check if the power supply is conform with the regulations. See
"3.1Power supply"on page44.

1 Troubleshooting
Service manual
9
ATXP20~35L2V1B + FTXP20~71L2V1B + ARXP20~35L2V1B +
RXP20~71L2V1B
Split Comfora R32
ESIE18-01 – 2019.02
Possible cause:
▪ Faulty or disturbance of the power supply (imbalance
>10%),
▪ Power drop,
▪ Short circuit.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
1.5.17 H3-00 – High pressure switch defect
Trigger Effect Reset
High pressure switch
is activated when
compressor is off.
Unit will stop
operating.
Manual reset via user
interface.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed
order.
1Perform a check of the high pressure switch. See "2.4 High
pressure switch"on page26.
Possible cause: Faulty high pressure switch.
2Perform a check of the refrigerant circuit. See "3.2 Refrigerant
circuit"on page45.
Possible cause:
▪ Stop valve is closed,
▪ Clogged refrigerant circuit,
▪ Refrigerant circuit NOT charged correctly,
▪ Humidity in the refrigerant circuit,
▪ Non-condensables in the refrigerant circuit,
▪ Leaking refrigerant circuit.
3Perform a check of the main PCB. See "2.8 Main PCB" on
page32.
Possible cause: Faulty main PCB.
4Perform a check of the inverter PCB. See "2.7Inverter PCB"on
page31.
Possible cause: Faulty power module = inverter PCB.
5Check if the power supply is conform with the regulations. See
"3.1Power supply"on page44.
Possible cause:
▪ Faulty or disturbance of the power supply (imbalance
>10%),
▪ Power drop,
▪ Short circuit.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
1.5.18 H6-00 – Location detection sensor
abnormality
Trigger Effect Reset
Compressor fails to
start within
15seconds after the
compressor run
command signal is
sent.
Unit will NOT stop
operating.
Automatic reset after
a continuous
operation of
10minutes.
If the error re-occurs
within 8minutes: unit
will stop operating.
Manual reset via user
interface.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed
order.
1Perform a check of the compressor. See "2.2Compressor"on
page20.
Possible cause: Faulty compressor.
2Perform a check of the main PCB. See "2.8 Main PCB" on
page32.
Possible cause: Faulty main PCB.
3Perform a check of the inverter PCB. See "2.7Inverter PCB"on
page31.
Possible cause: Faulty power module = inverter PCB.
4Perform a check of the refrigerant circuit. See "3.2 Refrigerant
circuit"on page45.
Possible cause:
▪ Stop valve is closed,
▪ Clogged refrigerant circuit,
▪ Refrigerant circuit NOT charged correctly,
▪ Humidity in the refrigerant circuit,
▪ Non-condensables in the refrigerant circuit,
▪ Leaking refrigerant circuit.
5Check if the power supply is conform with the regulations. See
"3.1Power supply"on page44.
Possible cause:
▪ Faulty or disturbance of the power supply (imbalance
>10%),
▪ Power drop,
▪ Short circuit.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
1.5.19 H8-00 – Compressor input abnormality
Trigger Effect Reset
DC voltage or current
sensor abnormality
based on the
compressor running
frequency and the
input current.
Unit will NOT stop
operating.
Automatic reset when
compressor runs
normally for
60minutes.
If the error re-occurs
too soon: unit will
stop operating.
Manual reset via user
interface.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed
order.
1Perform a check of the main PCB. See "2.8 Main PCB" on
page32.
Possible cause: Faulty main PCB.
2Perform a check of the inverter PCB. See "2.7Inverter PCB"on
page31.
Possible cause: Faulty power module = inverter PCB.
3Perform a check of the compressor. See "2.2Compressor"on
page20.
Possible cause: Faulty compressor.
4Perform a check of the reactor. See "2.11 Reactor" on
page40.

1 Troubleshooting
Service manual
10
ATXP20~35L2V1B + FTXP20~71L2V1B + ARXP20~35L2V1B +
RXP20~71L2V1B
Split Comfora R32
ESIE18-01 – 2019.02
Possible cause: Faulty reactor.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
1.5.20 H9-00 – Outdoor air thermistor
abnormality
Trigger Effect Reset
Outdoor air thermistor
input is out of range.
Unit will stop
operating.
Manual reset via user
interface.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed
order.
1Perform a check of the outdoor air thermistor. See
"2.13Thermistors"on page41.
Possible cause: Faulty outdoor air thermistor.
2Perform a check of the main PCB. See "2.8 Main PCB" on
page32.
Possible cause: Faulty main PCB.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
1.5.21 J3-00 – Discharge pipe thermistor
dislocation abnormality
Trigger Effect Reset
Discharge pipe
thermistor input is out
of range.
Unit will stop
operating.
Manual reset via user
interface.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed
order.
1Perform a check of the discharge pipe thermistor. See
"2.13Thermistors"on page41.
Possible cause: Faulty discharge pipe thermistor.
2Perform a check of the main PCB. See "2.8 Main PCB" on
page32.
Possible cause: Faulty main PCB.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
1.5.22 J6-00 – Outdoor heat exchanger
thermistor abnormality
Trigger Effect Reset
Outdoor heat
exchanger thermistor
input is out of range.
Unit will stop
operating.
Manual reset via user
interface.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed
order.
1Perform a check of the heat exchanger thermistor. See
"2.13Thermistors"on page41.
Possible cause: Faulty heat exchanger thermistor.
2Perform a check of the main PCB. See "2.8 Main PCB" on
page32.
Possible cause: Faulty main PCB.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
1.5.23 L3-00 – Electrical component temperature
abnormality
Trigger Effect Reset
Switch box
temperature is too
high.
Unit will stop
operating.
Manual reset via
remote controller.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed
order.
1Perform a check of the inverter PCB. See "2.7Inverter PCB"on
page31.
Possible cause: Faulty power module = inverter PCB.
2Perform a check of the outdoor unit fan motor. See
"2.9Outdoor unit fan motor"on page34.
Possible cause: Faulty outdoor unit fan motor.
3Check if the power supply is conform with the regulations. See
"3.1Power supply"on page44.
Possible cause:
▪ Faulty or disturbance of the power supply (imbalance
>10%),
▪ Power drop,
▪ Short circuit.
4Clean the outdoor heat exchanger. See "4 Maintenance" on
page48.
Possible cause: Dirty outdoor heat exchanger.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
1.5.24 L4-00 – Fin temperature increase
abnormality
Trigger Effect Reset
Radiating fin
thermistor measures
a too high
temperature.
Unit will stop
operating.
Manual reset via user
interface.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed
order.

1 Troubleshooting
Service manual
11
ATXP20~35L2V1B + FTXP20~71L2V1B + ARXP20~35L2V1B +
RXP20~71L2V1B
Split Comfora R32
ESIE18-01 – 2019.02
1Perform a check of the outdoor unit fan motor. See
"2.9Outdoor unit fan motor"on page34.
Possible cause: Faulty outdoor unit fan motor.
2Check if the power supply is conform with the regulations. See
"3.1Power supply"on page44.
Possible cause:
▪ Faulty or disturbance of the power supply (imbalance
>10%),
▪ Power drop,
▪ Short circuit.
3Perform a check of the inverter PCB. See "2.7Inverter PCB"on
page31.
Possible cause: Faulty power module = inverter PCB.
4Perform a check of the main PCB. See "2.8 Main PCB" on
page32.
Possible cause: Faulty main PCB.
5Check that the silicon grease is applied properly on the
radiation fin of the outdoor unit PCB. Adjust if needed.
Possible cause: Silicon grease NOT applied properly on the
radiation fin.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
1.5.25 L5-00 – Output over current abnormality
Trigger Effect Reset
An output overcurrent
is detected by
checking the current
that flows in the
inverter DC section.
Unit will stop
operating.
Manual reset via user
interface.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed
order.
1Perform a check of the refrigerant circuit. See "3.2 Refrigerant
circuit"on page45.
Possible cause:
▪ Stop valve is closed,
▪ Clogged refrigerant circuit,
▪ Refrigerant circuit NOT charged correctly,
▪ Humidity in the refrigerant circuit,
▪ Non-condensables in the refrigerant circuit,
▪ Leaking refrigerant circuit.
2Perform a check of the inverter PCB. See "2.7Inverter PCB"on
page31.
Possible cause: Faulty power module = inverter PCB.
3Perform a check of the compressor. See "2.2Compressor"on
page20.
Possible cause: Faulty compressor.
4Check if the power supply is conform with the regulations. See
"3.1Power supply"on page44.
Possible cause:
▪ Faulty or disturbance of the power supply (imbalance
>10%),
▪ Power drop,
▪ Short circuit.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
1.5.26 P4-00 – Fin thermistor abnormality
Trigger Effect Reset
Radiating fin
thermistor input is out
of range.
Unit will stop
operating.
Manual reset via user
interface.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed
order.
1Perform a check of the inverter PCB. See "2.7Inverter PCB"on
page31.
Possible cause: Faulty power module = inverter PCB.
2Perform a check of the main PCB. See "2.8 Main PCB" on
page32.
Possible cause: Faulty main PCB.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
1.5.27 U0-00 – Shortage of refrigerant
Trigger Effect Reset
Refrigerant shortage
detected.
Unit will stop
operating.
Automatic reset.
Power reset via
outdoor unit.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed
order.
1Perform a check of all refrigerant thermistors. See
"2.13Thermistors"on page41.
Possible cause: Faulty refrigerant thermistor(s).
2Perform a check of the refrigerant circuit. See "3.2 Refrigerant
circuit"on page45.
Possible cause:
▪ Stop valve is closed,
▪ Clogged refrigerant circuit,
▪ Refrigerant circuit NOT charged correctly,
▪ Humidity in the refrigerant circuit,
▪ Non-condensables in the refrigerant circuit,
▪ Leaking refrigerant circuit.
3Perform a check of the compressor. See "2.2Compressor"on
page20.
Possible cause: Faulty compressor.
4Perform a check of the expansion valve. See "2.3 Expansion
valve"on page23.
Possible cause: Faulty expansion valve.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.

1 Troubleshooting
Service manual
12
ATXP20~35L2V1B + FTXP20~71L2V1B + ARXP20~35L2V1B +
RXP20~71L2V1B
Split Comfora R32
ESIE18-01 – 2019.02
1.5.28 U2-00 – Main circuit voltage abnormality
Trigger Effect Reset
Power supply
abnormality or instant
power failure is
detected.
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.
INFORMATION
In case of preferential kWh rate, the indoor unit also needs
a power reset.
1Check if the power supply is conform with the regulations. See
"3.1Power supply"on page44.
Possible cause:
▪ Faulty or disturbance of the power supply (imbalance
>10%),
▪ Power drop,
▪ Short circuit.
2Perform a check of the compressor. See "2.2Compressor"on
page20.
Possible cause: Faulty compressor.
3Perform a check of the outdoor unit fan motor. See
"2.9Outdoor unit fan motor"on page34.
Possible cause: Faulty outdoor unit fan motor.
4Perform a check of the main PCB. See "2.8 Main PCB" on
page32.
Possible cause: Faulty main PCB.
5Perform a check of the indoor unit PCB. See "2.6 Indoor unit
PCB"on page29.
Possible cause: Faulty indoor unit PCB.
6Wait until the compressor restarts.
Possible cause:
▪ Momentary drop of voltage,
▪ Momentary power failure.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
1.5.29 U4-00 – Indoor/outdoor transmission
abnormality
Trigger Effect Reset
Communication
failure between
outdoor and indoor
unit.
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.
INFORMATION
In case of preferential kWh rate, the indoor unit also needs
a power reset.
1Check if the power supply is conform with the regulations. See
"3.1Power supply"on page44.
Possible cause:
▪ Faulty or disturbance of the power supply (imbalance
>10%),
▪ Power drop,
▪ Short circuit.
2Perform a check of the power supply, connections, wiring,…
between the outdoor unit and the indoor unit. See "3.1 Power
supply"on page44.
Possible cause: Faulty wiring between the outdoor unit and
the indoor unit.
3Perform a check of the main PCB. See "2.8 Main PCB" on
page32.
Possible cause: Faulty main PCB.
4Perform a check of the outdoor unit fan motor. See
"2.9Outdoor unit fan motor"on page34.
Possible cause: Faulty outdoor unit fan motor.
5Perform a check of the indoor unit PCB. See "2.6 Indoor unit
PCB"on page29.
Possible cause: Faulty indoor unit PCB.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
1.5.30 UA-00 – Indoor/outdoor combination
abnormality
Trigger Effect Reset
Signal transmission
between outdoor and
indoor unit
abnormality. Improper
combination of
outdoor and indoor
unit.
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.
INFORMATION
In case of preferential kWh rate, the indoor unit also needs
a power reset.
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 "3.1 Power
supply"on page44.
Possible cause: Faulty wiring between the outdoor unit and
the indoor unit.
3Perform a check of the main PCB. See "2.8 Main PCB" on
page32.
Possible cause: Faulty main PCB.
4Perform a check of the indoor unit PCB. See "2.6 Indoor unit
PCB"on page29.
Possible cause: Faulty indoor unit PCB.

1 Troubleshooting
Service manual
13
ATXP20~35L2V1B + FTXP20~71L2V1B + ARXP20~35L2V1B +
RXP20~71L2V1B
Split Comfora R32
ESIE18-01 – 2019.02
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.

1 Troubleshooting
Service manual
14
ATXP20~35L2V1B + FTXP20~71L2V1B + ARXP20~35L2V1B +
RXP20~71L2V1B
Split Comfora R32
ESIE18-01 – 2019.02
1.6 Symptom based troubleshooting
1.6.1 Operation does not start
Check Detail
When the operation lamp is off,
there is a power failure.
Check the power supply.
▪ Is the power supply breaker
ON?
▪ Do other electrical appliances
work?
▪ Is the rated voltage (± 10%)
supplied?
▪ Check the insulation of the
electric system.
Check the type of the indoor unit. Is the indoor unit type compatible
with the outdoor unit?
Check the transmission between
indoor and outdoor.
▪ Connection wires.
Check the outdoor temperature. ▪ Heating operation cannot be
used when the outdoor
temperature is 18°C WB or
higher.
▪ Cooling operation cannot be
used when the outdoor
temperature is below –
10°CDB.
When the operation lamp blinks,
there may be an error code,
activating the protection device.
Diagnose with remote controller
indication.
See "1.5Error based
troubleshooting"on page4.
Check the remote controller
addresses.
Are the address settings for the
remote controller and indoor unit
correct?
Check the operation circuit. ▪ Is the thermal fuse blown.
▪ Are wire size and wire
connections OK?.
Check fan motor. ▪ Is the magnetic switch
defective?
▪ Is the overcurrent relay
defective?
Check compressor. ▪ Is the contact defective?
▪ Is the protection thermostat
defective?
▪ Is the compressor itself
defective?
Check remote controller. ▪ Are the batteries LOW?
▪ Are there incorrect settings?
1.6.2 Operation sometimes stops
Check Detail
When the operation lamp is off,
there is a power failure.
Check the power supply.
▪ A power failure of 2 to 10
cycles stops air conditioner
operation.
Check the outdoor temperature. ▪ Heating operation cannot be
used when the outdoor
temperature is 18°C WB or
higher.
▪ Cooling operation cannot be
used when the outdoor
temperature is below –
10°CDB.
Check Detail
When the operation lamp blinks,
there may be an error code,
activating the protection device.
Diagnose with remote controller
indication.
See "1.5Error based
troubleshooting"on page4.
1.6.3 Operation starts but the unit does not
cool/heat
Check Detail
Check the electrical power
supply.
Is the rated voltage (± 10%)
supplied?
Check for piping and wiring
errors in the connection between
the indoor unit and outdoor unit.
▪ Refrigerant piping is too long;
is the length within specified
range?
▪ Field piping is defective; is
there a refrigerant leakage?
▪ Is there capacity loss over the
condensor, saturation pressure
or sound because of air mixed
in to the circuit?
▪ Incorrect size of connection
wiring.
When the operation lamp blinks,
there may be a thermistor
detection error code, activating
the protection device.
▪ Check the resistance of all
thermistors.
▪ Check the connection of all
thermistors.
▪ Is there a malfunction in the
room temperature thermistor
or outdoor temperature
thermistor?
Check for faulty operation of the
electronic expansion valve.
Set the unit to cooling operation,
and check the temperature of the
liquid pipe to see if the electronic
expansion valve works.
Diagnose by service port
pressure and operating current.
Check for refrigerant shortage.
Check if the set temperature is
appropriate.
thermostat "off" can be activated,
set the appropriate temperature.
Check the type of the indoor and
outdoor units.
Is the indoor unit type compatible
with the outdoor unit?
Check the air filter. Is the air filter clean?
Check the installation conditions
(specified in the installation
manual).
▪ Does the installed model has
sufficient capacity?
▪ Is there a short circuit air flow
caused by insufficient
installation space?
Check the outdoor temperature. ▪ Heating operation cannot be
used when the outdoor
temperature is 18°C WB or
higher.
▪ Cooling operation cannot be
used when the outdoor
temperature is below –
10°CDB.

1 Troubleshooting
Service manual
15
ATXP20~35L2V1B + FTXP20~71L2V1B + ARXP20~35L2V1B +
RXP20~71L2V1B
Split Comfora R32
ESIE18-01 – 2019.02
1.6.4 Operating noise and vibrations
Check Detail
Check the installation conditions
(specified in the installation
manual).
▪ Use general vibration
prevention where needed.
▪ If the mounting wall is too thin,
you must use cushion material
or rubber, or change the
installation place.
▪ Refrigerant piping is too short;
is the length within specified
range?
▪ Due to bad installation or
general conditions there may
be deformation of the unit.
▪ Are all the screws installed and
tightened properly?
▪ Is all piping secured, fixed and
supported by inserting a
cushion material where
needed?
▪ Install piping weights or correct
by hand if any piping is in
contact with other parts.
▪ Is the fan in contact with other
parts? If so separate the fan
from the other parts.
Check refrigerant charge. ▪ Is the unit filled with the
specified refrigerant volume?
▪ Is there a flushing noise, due
to refrigerant shortage?
▪ Is there air in the system?
Check the expansion valve. If a passing sound is heard from
the pressure reducing valve,
apply sound insulation sheets of
putty to reduce the valve noise.
1.6.5 Abnormal high pressure
In cooling mode
Check item Detail
Does the outdoor unit fan run
normally?
Visual inspection
Is the outdoor unit heat
exchanger clogged?
Visual inspection
Is there clogging before or after
the expansion valve (capillary)?
▪ Check if there is a temperature
difference before and after
expansion valve (capillary).
▪ Check if the main valve unit of
expansion valve operates (by
noise, vibration).
Is the High Pressure Switch
normal?
Check continuity by using a
tester.
Is the outdoor unit installed under
such conditions that short circuit
easily occurs?
Visual inspection
Is the piping length ≤5m? Visual inspection
Does air enter the refrigerant
system?
Conduct refrigerant collection
and vacuum drying, and then
add proper amount refrigerant.
Is the refrigerant overcharged? Conduct refrigerant collection
and vacuum drying, and then
add proper amount refrigerant.
In cooling mode
Check item Detail
Does the indoor unit fan run
normally?
Visual inspection
Is the indoor unit heat exchanger
clogged?
Visual inspection
Is the indoor unit installed under
such conditions that short circuit
easily occurs?
Visual inspection
Is there clogging before or after
the expansion valve (capillary)?
▪ Check if there is a temperature
difference before and after
expansion valve (capillary).
▪ Check if the main valve unit of
expansion valve operates (by
noise, vibration).
Is the High Presure Switch
normal?
Check continuity by using a
tester.
Is the minimum piping length
respected?
Visual inspection
Does air enter the refrigerant
system?
Conduct refrigerant collection
and vacuum drying, and then
add proper amount refrigerant.
Is the refrigerant overcharged? Conduct refrigerant collection
and vacuum drying, and then
add proper amount refrigerant.
1.6.6 Abnormal low pressure
Abnormally low pressure level is mostly caused by the evaporator
side. The following contents are provided based on field checking of
service engineer. Further, the number is listed in the order of degree
of influence.
In cooling mode
Check item Detail
Does the outdoor unit fan run
normally?
Visual inspection
Is the indoor unit heat exchanger
clogged?
Visual inspection
Is there clogging before or after
the expansion valve (capillary)?
▪ Check if there is a temperature
difference before and after
expansion valve (capillary).
▪ Check if the main valve unit of
expansion valve operates (by
noise, vibration).
Is the check valve clogged? Check if there is a temperature
difference before and after check
valve. If YES, the check valve is
caught.
Is the indoor unit installed under
such conditions that short circuit
easily occurs?
Visual inspection
Is the refrigerant gas short? Conduct refrigerant collection
and vacuum drying, and then
add proper amount refrigerant.
In cooling mode
Check item Detail
Does the outdoor unit fan run
normally?
Visual inspection
Is the outdoor unit heat
exchanger clogged?
Visual inspection
Is the outdoor unit installed under
such conditions that short circuit
easily occurs?
Visual inspection

1 Troubleshooting
Service manual
16
ATXP20~35L2V1B + FTXP20~71L2V1B + ARXP20~35L2V1B +
RXP20~71L2V1B
Split Comfora R32
ESIE18-01 – 2019.02
Check item Detail
Is there clogging before or after
the expansion valve (capillary)?
▪ Check if there is a temperature
difference before and after
expansion valve (capillary).
▪ Check if the main valve unit of
expansion valve operates (by
noise, vibration).
Is the check valve clogged? after check valve. If YES, the
check valve is caught.
Is the refrigerant gas short? Conduct refrigerant collection
and vacuum drying, and then
add proper amount refrigerant.
1.6.7 Indoor fan starts operating but the
compressor does not operate
Check Detail
Check the power supply. ▪ Is the rated voltage (± 10%)
supplied?
▪ Check the insulation of the
electric system.
Check the thermistor. ▪ Connection witch PCB.
▪ Output.
Check PCB's. ▪ if green led on the control PCB
is not blinking, then the
microprocessor is not working.
▪ if the green led on the main
PCB is not blinking, then the
microprocessor is not working.
▪ if first green LED on the
service monitor PCB is not
blinking, then the
microprocessor is not working.
Check the magnetic switch.
Check the power transistor.
Check the compressor. ▪ Defective contact.
▪ Defective compressor.
▪ Defective protection
thermostat.
Check the outdoor temperature. ▪ Heating operation cannot be
used when the outdoor
temperature is 18°C WB or
higher.
▪ Cooling operation cannot be
used when the outdoor
temperature is below –
10°CDB.
1.6.8 Operation starts and the unit stops
immediately
Check Detail
Check the power supply. ▪ Is the capacity of the safety
breaker as specified?
▪ If the earth leakage breaker is
too sensitive, then increase the
set value of the earth leakage
current of the breaker or
replace the breaker.
▪ Is the circuit exclusive?
▪ Is the rated voltage (± 10%)
supplied?
▪ Is there an incorrect size of
connection wiring?
Check the refrigerant charge. ▪ Overcharge.
▪ Air in the system.
▪ Water in the system.
Check the fan motor. ▪ Check the magnetic switch.
▪ Check the overcurrent relay.
Check the four way valve coil. ▪ Is there a short circuit?
▪ Is the four way valve coil
broken?
Check the outdoor PCB. ▪ Is there a short circuit?
▪ Is the outdoor PCB broken?
Check the heat exchanger. Soiled heat exchanger,
obstruction.
Check the airflow. Soiled air filter, obstruction,
installation space.
1.6.9 Operation stops, unit cannot start for a
while
Check Detail
Check if standby function is
activated.
▪ Compressor delay timer is
counting.
▪ Wait for minimum 3 minutes.
Check the power supply. ▪ Low voltage?
▪ Is the size of the power cable
sufficient?
Check the refrigerant charge. ▪ Incorrect charge.
▪ Air in the system.
▪ Water in the system.
▪ Obstruction in the system.
Check compressor. ▪ Overcurrent relay.
▪ Protection thermostat.
1.6.10 Unit discharges white mist
Check Detail
Check installation conditions. ▪ Humid site.
▪ Dirty site.
▪ Oil mist.
Check installation conditions. Dirty heat exchanger.
Air filter. Dirty air filter.
Fan motor. Defective fan motor.

1 Troubleshooting
Service manual
17
ATXP20~35L2V1B + FTXP20~71L2V1B + ARXP20~35L2V1B +
RXP20~71L2V1B
Split Comfora R32
ESIE18-01 – 2019.02
1.6.11 Swing flap does not operate
Symptom Check Detail
Swing flap does not
operate
Check swing flap
motor
Some functions can
force the swing flap
into a fixed position,
although swing mode
is selected on the
remote controller.
This is not a unit
error, but a control
function to prevent
draft to the customer.
Check indoor unit
PCB
Connector connection

2 Components
Service manual
18
ATXP20~35L2V1B + FTXP20~71L2V1B + ARXP20~35L2V1B +
RXP20~71L2V1B
Split Comfora R32
ESIE18-01 – 2019.02
2 Components
2.1 4-way valve
2.1.1 Checking procedures
INFORMATION
It is recommended to perform the checks in the listed
order.
To perform a mechanical check of the 4-way valve
Prerequisite: Turn OFF the unit via the user interface.
Prerequisite: Turn OFF the respective circuit breaker.
Prerequisite: Remove the required plate work, see "2.10 Plate
work"on page35.
1Disconnect the 4‑way valve connector from the main PCB.
2Turn ON the power of the unit.
INFORMATION
Default position of the 4‑way valve is Heating mode.
3Activate Heating operation via the user interface.
Water temperature after plate
type heat exchanger of the
indoor unit:
Action
Drops 4‑way valve is stuck in cooling
position. Replace the 4‑way
valve body, see "2.1.2Repair
procedures"on page19.
Rises Skip the next step of this
procedure.
Does NOT rise/drop Perform the next step of this
procedure.
4Connect a manifold to one of the service ports of the refrigerant
circuit and check the pressure.
Refrigerant pressure
measured?
Action
Yes Perform a position check of the
4‑way valve, see "2.1.1Checking
procedures"on page18.
No Leaks may be found in the
refrigerant circuit. Perform a
pressure test of the refrigerant
circuit, see "3.2.1Checking
procedures"on page45.
CAUTION
To prevent damage due to liquid entering the compressor,
the steps below MUST ONLY be executed once.
CAUTION
Make sure you have a pressure difference of at least 6bar
between the high and low pressure when performing this
test.
5Place a round permanent magnet on the core of the solenoid
valve and listen to the 4‑way valve.
Does the 4‑way valve switch? Action
Yes Perform an electrical check of the
4‑way valve, see "2.1.1Checking
procedures"on page18.
Does the 4‑way valve switch? Action
No Replace the 4‑way valve body,
see "2.1.2Repair procedures"on
page19.
To perform an electrical check of the 4-way valve
1First perform a mechanical check of the 4‑way valve, see
"2.1.1Checking procedures"on page18.
2Activate Cooling operation via the user interface.
3Measure the voltage on the 4‑way valve connector pins 1-3.
The measured voltage MUST be 220~240 V AC during
switching and 12VDC after switching of the 4‑way valve.
Is the measured voltage
correct?
Action
Yes Skip the next step of this
procedure.
No Perform the next step of this
procedure.
4Disconnect the 4‑way valve connector from the main PCB and
measure the voltage on the connector pins 1-3 of the connector
on the main PCB. The voltage MUST be 220~240VAC during
switching and 12VDC after switching.
Is the measured voltage on the
4‑way valve connector of the
main PCB correct?
Action
Yes Replace the 4‑way valve coil, see
"2.1.2Repair procedures"on
page19.
No Replace the main PCB, see
"2.8Main PCB"on page32.
5Disconnect the 4‑way valve connector from the main PCB and
measure the resistance of the 4‑way valve coil. The resistance
MUST be 1000~2000Ω.
Is the measured resistance
correct?
Action
Yes Perform the next step of this
procedure.
No Replace the 4‑way valve coil, see
"2.1.2Repair procedures"on
page19.
6De-activate Cooling and activate Heating operation via the user
interface.
7Measure the temperature after the plate type heat exchanger.
Does the measured
temperature rise?
Action
Yes Perform a position check of the
4‑way valve, see "2.1.1Checking
procedures"on page18.
No Replace the main PCB, see
"2.8Main PCB"on page32.
To perform a position check of the 4-way valve
1First perform a mechanical check of the 4‑way valve, see
"2.1.1Checking procedures"on page18.
2Slide a magnet over the front and rear side of the 4‑way valve
body. The magnet MUST be attracted in the positions a or b,
but NOT in positions c.

2 Components
Service manual
19
ATXP20~35L2V1B + FTXP20~71L2V1B + ARXP20~35L2V1B +
RXP20~71L2V1B
Split Comfora R32
ESIE18-01 – 2019.02
a a
b b
c c
aMagnet attracted
bMagnet attracted
cMagnet NOT attracted
Magnet is attracted in the
correct positions of the 4‑way
valve?
Action
Yes The 4‑way valve is OK. Return to
the troubleshooting of the
specific error and continue with
the next procedure.
No Replace the 4‑way valve body,
see "2.1.2Repair procedures"on
page19.
2.1.2 Repair procedures
To remove the 4-way valve coil
Prerequisite: Turn OFF the unit via the user interface.
Prerequisite: Turn OFF the respective circuit breaker.
Prerequisite: Remove the required plate work, see "2.10 Plate
work"on page35.
Prerequisite: If needed, remove any parts to create more space for
the removal of the 4‑way valve coil.
1Remove the screw and remove the 4‑way valve coil from the
4‑way valve body.
c a b
aScrew
b4‑way valve coil
c4‑way valve body
2Cut all tie straps that fix the 4‑way valve coil harness.
3Disconnect the 4‑way valve coil connector from the main PCB.
4To install the 4‑way valve coil, see "2.1.2Repair procedures"on
page19.
To remove the 4-way valve body
Prerequisite: Recuperate the refrigerant from the refrigerant circuit,
see "3.2.2Repair procedures"on page46.
1Remove the 4‑way valve coil from the 4‑way valve body, see
"2.1.2Repair procedures"on page19.
2Cut the 4‑way valve pipes using a pipe cutter.
cd a b a
a4‑way valve pipe
b4‑way valve
cPutty
dInsulation
3Remove the 4‑way valve.
4Keep the putty and the insulation for re-use.
5To install the 4‑way valve body, see "2.1.2 Repair
procedures"on page19.
To install the 4-way valve body
1Install the 4‑way valve in the correct location.
2Wrap a wet rag around the 4‑way valve and solder the 4‑way
valve pipes to the 4‑way valve.
CAUTION
Overheating the valve will damage or destroy it.

2 Components
Service manual
20
ATXP20~35L2V1B + FTXP20~71L2V1B + ARXP20~35L2V1B +
RXP20~71L2V1B
Split Comfora R32
ESIE18-01 – 2019.02
cd a b a
a4‑way valve pipe
b4‑way valve
cPutty
dInsulation
3Install the putty and the insulation in their original location.
4Install the 4‑way valve coil on the 4‑way valve body, see
"2.1.2Repair procedures"on page19.
5Add refrigerant to the refrigerant circuit, see "3.2.2 Repair
procedures"on page46.
To install the 4-way valve coil
1Install the 4‑way valve coil on the 4‑way valve body.
c a b
aScrew
b4‑way valve coil
c4‑way valve body
2Install and tighten the screw to fix the 4‑way valve coil.
3Route the 4‑way valve coil harness towards the main PCB.
4Connect the 4‑way valve coil connector to the main PCB.
WARNING
When reconnecting a connector to the PCB, do NOT apply
force, as this may damage the connector or connector pins
of the PCB.
5Fix the 4‑way valve coil harness using new tie straps.
Is the problem solved? Action
Yes No further actions required.
No Return to the troubleshooting of
the specific error and continue
with the next procedure.
2.2 Compressor
2.2.1 Checking procedures
INFORMATION
It is recommended to perform the checks in the listed
order.
To perform a mechanical check of the compressor
Prerequisite: Turn OFF the unit via the user interface.
Prerequisite: Turn OFF the respective circuit breaker.
Prerequisite: Remove the required plate work, see "2.10 Plate
work"on page35.
1Open the compressor insulation.
2Check the compressor dampers and piping for any damage.
a
a
aDamper
INFORMATION
The compressor dampers may look different.
Compressor dampers and
piping are in a good
condition?
Action
Yes Perform an electrical check of the
compressor, see "2.2.1Checking
procedures"on page20.
No Replace the compressor, see
"2.2.2Repair procedures"on
page22.
To perform an electrical check of the compressor
1First perform a mechanical check of the compressor, see
"2.2.1Checking procedures"on page20.
2Open the compressor insulation.
WARNING
The smoothing capacitor MUST discharge below 10VDC
before disconnecting the Faston connectors from the
compressor wiring terminals. Risk of electrocution.
3Remove the cover of the compressor wire terminals.