Daikin Siesta ATXM35N2V1B Product information sheet

User reference guide
Daikin room air conditioner English
User reference guide
Daikin room air conditioner
ATXM20N2V1B
ATXM25N2V1B
ATXM35N2V1B
ATXM50N2V1B

Table of contents
User reference guide
2
ATXM20~50N2V1B
Daikin room air conditioner
4P518786-2C – 2018.09
Table of contents
1 General safety precautions 2
1.1 About the documentation .......................................................... 2
1.1.1 Meaning of warnings and symbols.............................. 2
1.2 For the user ............................................................................... 3
2 About the documentation 3
2.1 About this document.................................................................. 3
2.2 User reference guide at a glance .............................................. 3
3 About the system 4
3.1 Indoor unit ................................................................................. 4
3.1.1 Indoor unit display....................................................... 4
3.2 About the user interface ............................................................ 4
3.2.1 Components: User interface ....................................... 5
3.2.2 Status: User interface LCD ......................................... 5
3.2.3 To operate the user interface...................................... 5
4 Before operation 6
4.1 Overview: Before operation....................................................... 6
4.2 To insert the batteries................................................................ 6
4.3 To fix the user interface to the wall............................................ 6
4.4 Clock ......................................................................................... 6
4.4.1 To set the clock........................................................... 6
4.5 Brightness of the indoor unit display ......................................... 6
4.5.1 To set the brightness of the indoor unit display .......... 6
4.6 To turn on the power supply...................................................... 6
5 Operation 7
5.1 Operation range ........................................................................ 7
5.2 When to use which feature........................................................ 7
5.3 Operation mode and temperature setpoint................................ 7
5.3.1 To start/stop operation and to set the temperature..... 8
5.4 Airflow rate ................................................................................ 8
5.4.1 To adjust the airflow rate............................................. 8
5.5 Airflow direction ......................................................................... 8
5.5.1 To adjust vertical airflow direction............................... 8
5.5.2 To adjust horizontal airflow direction........................... 8
5.5.3 To use 3-D airflow direction ........................................ 8
5.6 Comfort airflow and Intelligent eye operation ............................ 9
5.6.1 Comfort airflow operation............................................ 9
5.6.2 Intelligent eye operation.............................................. 9
5.6.3 To start/stop Comfort and Intelligent eye operation.... 9
5.7 Powerful operation .................................................................... 9
5.7.1 To start/stop Powerful operation ................................. 9
5.8 Econo and Outdoor unit quiet operation.................................... 10
5.8.1 Econo operation.......................................................... 10
5.8.2 Outdoor unit quiet operation ....................................... 10
5.8.3 To start/stop Econo and Outdoor unit quiet operation 10
5.9 Flash streamer air cleaning operation ....................................... 10
5.9.1 To start/stop Flash Streamer operation ...................... 10
5.10 OFF/ON timer operation............................................................ 10
5.10.1 To start/stop OFF timer operation............................... 10
5.10.2 To start/stop ON timer operation................................. 11
5.10.3 To combine OFF timer and ON timer.......................... 11
5.11 Weekly timer operation.............................................................. 11
5.11.1 To set Weekly timer operation .................................... 11
5.11.2 To copy reservations................................................... 12
5.11.3 To confirm reservations .............................................. 12
5.11.4 To deactivate and reactivate Weekly timer operation. 12
5.11.5 To delete reservations ................................................ 12
5.12 Wireless LAN connection .......................................................... 13
5.12.1 Precautions when using the wireless adapter............. 13
5.12.2 To install the Daikin Online Controller application ...... 13
5.12.3 Wireless adapter components .................................... 13
5.13 About Multi system .................................................................... 13
5.13.1 Priority room setting .................................................... 13
5.13.2 Night quiet mode.......................................................... 14
5.13.3 Cooling/heating mode lock........................................... 14
6 Energy saving and optimum operation 14
7 Maintenance and service 14
7.1 Overview: Maintenance and service .......................................... 14
7.2 To clean the indoor unit and user interface ................................ 15
7.3 To clean the front panel.............................................................. 15
7.4 To remove the front panel .......................................................... 15
7.5 About the air filters ..................................................................... 16
7.6 To clean the air filters ................................................................. 16
7.7 To clean the titanium apatite deodorizing filter........................... 16
7.8 To replace the titanium apatite deodorizing filter........................ 16
7.9 To re-install the front panel......................................................... 17
7.10 To take following items into account before a long idle period... 17
8 Troubleshooting 17
8.1 Symptoms that are NOT system malfunctions ........................... 18
8.1.1 Symptom: A sound like water flowing is heard ............ 18
8.1.2 Symptom: A blowing sound is heard............................ 18
8.1.3 Symptom: A ticking sound is heard.............................. 18
8.1.4 Symptom: A whistling sound is heard .......................... 18
8.1.5 Symptom: A clicking sound during operation or idle
time is heard ................................................................ 18
8.1.6 Symptom: A clapping sound is heard .......................... 18
8.1.7 Symptom: White mist comes out of a unit (Indoor
unit, outdoor unit) ......................................................... 18
8.1.8 Symptom: The units can give off odours...................... 18
8.1.9 Symptom: The outdoor fan rotates while the air
conditioner is not in operation ...................................... 18
8.2 Solving problems based on error codes..................................... 19
8.3 Troubleshooting for wireless connection adapter....................... 19
8.4 Solving problems based on the LED on the outdoor unit ........... 20
9 Disposal 20
10 Glossary 20
1 General safety precautions
1.1 About the documentation
▪ The original documentation is written in English. All other
languages are translations.
▪ The precautions described in this document cover very important
topics, follow them carefully.
▪ The installation of the system, and all activities described in the
installation manual and the installer reference guide MUST be
performed by an authorised installer.
1.1.1 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
Indicates a situation that could result in burning because of
extreme hot or cold temperatures.
DANGER: RISK OF EXPLOSION
Indicates a situation that could result in explosion.

2 About the documentation
User reference guide
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ATXM20~50N2V1B
Daikin room air conditioner
4P518786-2C – 2018.09
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.
INFORMATION
Indicates useful tips or additional information.
Symbol Explanation
Before installation, read the installation and
operation manual, and the wiring instruction sheet.
Before performing maintenance and service tasks,
read the service manual.
For more information, see the installer and user
reference guide.
1.2 For the user
▪ If you are NOT sure how to operate the unit, contact your installer.
▪ This appliance can be used by children aged from 8 years and
above and persons with reduced physical, sensory or mental
capabilities or lack of experience and knowledge if they have been
given supervision or instruction concerning use of the appliance in
a safe way and understand the hazards involved. Children shall
NOT play with the appliance. Cleaning and user maintenance
shall NOT be made by children without supervision.
WARNING
To prevent electric shocks or fire:
▪ Do NOT rinse the unit.
▪ Do NOT operate the unit with wet hands.
▪ Do NOT place any objects containing water on the unit.
NOTICE
▪ Do NOT place any objects or equipment on top of the
unit.
▪ Do NOT sit, climb or stand on the unit.
▪ Units are marked with the following symbol:
This means that electrical and electronic products may NOT be
mixed with unsorted household waste. Do NOT try to dismantle
the system yourself: the dismantling of the system, treatment of
the refrigerant, of oil and of other parts must be done by an
authorized installer and must comply with applicable legislation.
Units must be treated at a specialized treatment facility for reuse,
recycling and recovery. By ensuring this product is disposed of
correctly, you will help to prevent potential negative consequences
for the environment and human health. For more information,
contact your installer or local authority.
▪ Batteries are marked with the following symbol:
This means that the batteries may NOT be mixed with unsorted
household waste. If a chemical symbol is printed beneath the
symbol, this chemical symbol means that the battery contains a
heavy metal above a certain concentration.
Possible chemical symbols are: Pb: lead (>0.004%).
Waste batteries must be treated at a specialized treatment facility
for reuse. By ensuring waste batteries are disposed of correctly,
you will help to prevent potential negative consequences for the
environment and human health.
2 About the documentation
2.1 About this document
Thank you for purchasing this product. Please:
▪ Keep the documentation for future reference.
Target audience
Endusers
INFORMATION
This appliance is intended to be used by expert or trained
users in shops, in light industry, and on farms, or for
commercial and household use by lay persons.
Documentation set
This document is part of a documentation set. The complete set
consists of:
▪General safety precautions:
▪ Safety instructions that you must read before operating your
system
▪ Format: Paper (in the box of the indoor unit)
▪Operation manual:
▪ Quick guide for basic usage
▪ Format: Paper (in the box of the indoor unit)
▪User reference guide:
▪ Detailed step-by-step instructions and background information
for basic and advanced usage
▪ Format: Digital files on http://www.daikineurope.com/support-
and-manuals/product-information/
Latest revisions of the supplied documentation may be available on
the regional Daikin website or via your installer.
The original documentation is written in English. All other languages
are translations.
2.2 User reference guide at a glance
Chapter Description
General safety precautions Safety instructions that you MUST
read before operation
About the documentation What documentation exists for the
user
About the system ▪ Operation range
▪ Description of indoor unit and user
interface
Before operation What to do before starting operation
Operation How and when to use certain features

3 About the system
User reference guide
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Daikin room air conditioner
4P518786-2C – 2018.09
Chapter Description
Energy saving and optimum
operation
How to save energy
Maintenance and service How to maintain and service the unit
Troubleshooting What to do in case of problems
Disposal How to dispose of the system
Glossary Definition of terms
3 About the system
WARNING: FLAMMABLE MATERIAL
The refrigerant inside this unit is mildly flammable.
3.1 Indoor unit
CAUTION
Do NOT insert fingers, rods or other objects into the air
inlet or outlet. When the fan is rotating at high speed, it will
cause injury.
INFORMATION
The sound pressure level is less than 70dBA.
WARNING
▪ Do not modify, disassemble, remove, reinstall or repair
the unit yourself as incorrect dismantling or installation
may cause an electric shock or fire. Contact your
dealer.
▪ In case of accidental refrigerant leaks, make sure there
are no naked flames. The refrigerant itself is entirely
safe, non-toxic and mildly flammable, but it will
generate toxic gas when it accidentally leaks into a
room where combustible air from fan heaters, gas
cookers, etc. is present. Always have qualified service
personnel confirm that the point of leakage has been
repaired or corrected before resuming operation.
INFORMATION
The following figures are just examples and may NOT
completely match your system layout.
a
e
d
l
mg
k
h
f
b
c
i
j
aAir inlet
bAir outlet
cFront panel
dService cover
ePlace for wireless adapter
fIndoor unit display
gIntelligent eye sensor
hRoom temperature sensor
iOnly for class 20~35: Titanium apatite deodorizing filter
(without frame)
jOnly for class 50: Titanium apatite deodorizing filter (with
frame)
kAir filter
lFlaps (horizontal blades)
mLouvres (vertical blades)
3.1.1 Indoor unit display
a
b
c
d
e
aSignal receiver for user interface
bOperation lamp
cTimer lamp
dIntelligent eye lamp
eON/OFF button
ON/OFF button
If the user interface is missing, you can use the ON/OFF button on
the indoor unit to start/stop operation. When operation is started
using this button, the following settings are used:
▪ Operation mode = Automatic
▪ Temperature setting = 25°C
▪ Airflow rate = Automatic
3.2 About the user interface
▪Direct sunlight. Do NOT expose the user interface to direct
sunlight.
▪Dust. Dust on the signal transmitter or receiver will reduce
sensitivity. Wipe off dust with a soft cloth.
▪Fluorescent lights. Signal communication might be disabled if
fluorescent lamps are in the room. In that case, contact your
installer.
▪Other appliances. If the user interface signals operate other
appliances, move the other appliances, or contact your installer.
▪Curtains. Make sure that the signal between the unit and the user
interface is NOT blocked by curtains or other objects.
NOTICE
▪ Do NOT drop the user interface.
▪ Do NOT let the user interface get wet.

3 About the system
User reference guide
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ATXM20~50N2V1B
Daikin room air conditioner
4P518786-2C – 2018.09
3.2.1 Components: User interface
d
a
g
m
h
c
b
n
lf
e
i
j
k
p
o
aSignal transmitter
bLCD display
cTemperature adjustment button
dON/OFF button
eVertical swing button
fHorizontal swing button
gComfort airflow and Intelligent eye operation button
hSelect button
iClock button and indoor unit display brightness
jButtons for ON/OFF timer operation
kButtons for Weekly timer operation
lStreamer
mEcono and Outdoor unit quiet operation button
nMode button
oPowerful button
pFan button
3.2.2 Status: User interface LCD
Icon Description
Operation is active
Operation mode = Automatic
Operation mode = Drying
Operation mode = Heating
Operation mode = Cooling
Operation mode = Fan only
Powerful operation is active
Econo operation is active
Outdoor unit quiet operation is active
Icon Description
The indoor unit receives a signal from the user
interface
Current temperature setting
Airflow rate = Automatic
Airflow rate = Indoor unit quiet
Airflow rate = High
Airflow rate = Medium high
Airflow rate = Medium
Airflow rate = Medium low
Airflow rate = Low
Comfort operation is active
Intelligent eye is active
Automatic vertical swing is active
Automatic horizontal swing is active
Streamer is active
ON timer is active
OFF timer is active
Weekly timer is active
Day of the week
Current time
3.2.3 To operate the user interface
a
aSignal receiver
1Aim the signal transmitter at the signal receiver on the indoor
unit (maximum distance for communication is 7m).
Result: When the indoor unit receives a signal from the user
interface, you will hear a sound:
Sound Description
Beep-beep Operation starts.
Beep Setting changes.
Long beep Operation stops.

4 Before operation
User reference guide
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Daikin room air conditioner
4P518786-2C – 2018.09
4 Before operation
4.1 Overview: Before operation
This chapter describes what you have to do before operating the
unit.
Typical workflow
Before operation usually consist of the following stages:
▪ Inserting the batteries in the user interface.
▪ Fixing the user interface to the wall.
▪ Setting the brightness of the indoor unit display.
▪ Setting the clock.
▪ Turning on the power supply.
4.2 To insert the batteries
The batteries will last for about 1 year.
1Remove the front cover.
2Insert both batteries at once.
3Put back the front cover.
2
3
1
AAA.LR03
INFORMATION
▪ Low energy of battery is indicated by flashing of LCD
display.
▪ ALWAYS replace both batteries at once.
4.3 To fix the user interface to the wall
cba
2×
aUser interface
bScrews (field supply)
cUser interface holder
1Choose a place where the signals reach the unit.
2Attach the holder with screws to the wall or a similar location.
3Hang the user interface on the user interface holder.
4.4 Clock
If the indoor unit's internal clock is NOT set to the correct time, the
ON timer, OFF timer and weekly timer will NOT operate correctly.
The clock must be set again:
▪ After a circuit breaker has turned the unit OFF.
▪ After a power failure.
▪ After replacing batteries in the user interface.
4.4.1 To set the clock
Note: If the time is NOT set, , , and blink.
1Press .
Result: and blink
2Press or to set the current day of the week.
Note: Holding down or increases or decreases the time
setting rapidly.
Display Day of the week
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday
3Press .
Result: blinks.
4Press or to set the correct time.
5Press .
Result: Setting is complete. blinks.
4.5 Brightness of the indoor unit
display
Adjust the brightness of the indoor unit display as desired, or turn
OFF the display.
4.5.1 To set the brightness of the indoor unit
display
1Keep pressed for at least 2seconds every time you need to
change the setting.
Result: Brightness will be changed in order: high, low, off.
4.6 To turn on the power supply
1Turn the circuit breaker on.

5 Operation
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4P518786-2C – 2018.09
Result: The flap of the indoor unit will open and close to set the
reference position.
5 Operation
5.1 Operation range
Use the system in the following temperature and humidity ranges for
safe and effective operation.
In combination with outdoor units: 2AMXM and 3AMXM
Cooling and
drying(a)
Heating(a)
Outdoor temperature –10~46°CDB –15~24°CDB
–15~18°CWB
Indoor temperature 18~37°C DB
14~28°CWB
10~30°CDB
Indoor humidity ≤80%(b) —
In combination with other outdoor units
Cooling and
drying(a)
Heating(a)
Outdoor temperature –10~50°CDB –20~24°CDB
–21~18°CWB
Indoor temperature 18~37°C DB
14~28°CWB
10~30°CDB
Indoor humidity ≤80%(b) —
If operated outside the operation range:
(a) A safety device might stop the operation of the system.
(b) Condensation might occur on the indoor unit and drip.
5.2 When to use which feature
You can use the following table to determine which features to use:
INFORMATION
Operation modes: cooling, drying and automatic are
NOT available for the heating only version of the product.
Feature Tasks
Basic features
Operation modes and
temperature
To start/stop the system and to set the
temperature:
▪ In Heating and Cooling mode, heat
up or cool down a room.
▪ In Fan only mode, blow air in a room
without heating or cooling.
▪ In Drying mode, decrease the
humidity in a room.
▪ In Automatic mode, an appropriate
temperature and operation mode is
automatically selected.
+ Airflow
direction
To adjust the airflow direction (swing or
fixed position).
Airflow rate To adjust the amount of air blown into
the room.
To run more quietly.
Advanced features
Streamer To remove airborne allergens such as
mold, pollen, adjuvant substances,
viruses, bacteria…
Feature Tasks
Econo To use the system when you are also
using other power-consuming
appliances.
To save energy.
Outdoor unit quiet To decrease the noise level of the
outdoor unit. Example: At night.
Comfort To automatically adjust the airflow
direction to cool down or heat up the
room more effectively.
Intelligent eye To prevent the air from coming in direct
contact with people.
To save energy when nobody is in the
room.
Powerful To cool down or heat up the room
quickly.
ON timer + OFF
timer
To automatically turn ON or OFF the
system.
Weekly timer To automatically turn ON or OFF the
system on a weekly basis.
Additional features
Wireless LAN connection To operate the unit using smart
appliances.
5.3 Operation mode and temperature
setpoint
When. Adjust the system operation mode and set the temperature
when you want to:
▪ Heat up or cool down a room
▪ Blow air in a room without heating or cooling
▪ Decrease the humidity in a room
What. The system operates differently, depending on the user
selection.
INFORMATION
Operation modes: cooling, drying and automatic are
NOT available for the heating only version of the product.
Setting Description
Automatic The system cools down or heats up a
room to the temperature setpoint. It
automatically switches between cooling
and heating if necessary.
Drying The system decreases the humidity in a
room without changing the temperature.
Heating The system heats up a room to the
temperature setpoint.
Cooling The system cools down a room to the
temperature setpoint.
Fan The system only controls the airflow
(airflow rate and airflow direction).
The system does NOT control the
temperature.
Additional info:
▪Outside temperature. The system's cooling or heating effect
decreases when the outside temperature is too high or too low.
▪Defrost operation. During heating operation, frost might occur on
the outdoor unit and decrease the heating capacity. In that case,
the system automatically switches to defrosting operation to
remove the frost. During defrosting operation, hot air is NOT
blown from the indoor unit.

5 Operation
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4P518786-2C – 2018.09
▪Humidity sensor. Control the humidity by decreasing the
humidity during cooling process.
5.3.1 To start/stop operation and to set the
temperature
: Unit is operating.
: Operation mode = Automatic
: Operation mode = Drying
: Operation mode = Cooling
: Operation mode = Heating
: Operation mode = Fan only
: Shows the set temperature.
1Press one or more times to select the operation mode.
Result: The mode will be set as follows:
2Press to start operation.
Result: and the selected mode are displayed on the LCD.
3Press or one or more times to lower or raise the
temperature.
Cooling
operation
Heating
operation
Automatic
operation
Drying or Fan
only operation
18~32°C 10~30°C 18~30°C —
Note: When using drying or fan only mode, you cannot adjust the
temperature.
4Press to stop operation.
Result: disappears from the LCD. The operation lamp goes
off.
5.4 Airflow rate
1Press to choose:
5 airflow rate levels, from " " to " "
Automatic operation
Indoor unit quiet operation. When the airflow is set to
" ", the noise from the unit will be reduced.
INFORMATION
▪ If the unit reach the temperature setpoint in cooling,
heating or automatic mode. Fan will stop operating.
▪ When using drying operation mode, you CANNOT
adjust the airflow rate setting.
5.4.1 To adjust the airflow rate
1Press to change the airflow setting as follows:
5.5 Airflow direction
When. Adjust the airflow direction as desired.
What. The system directs the airflow differently, depending on the
user selection (swinging or fixed position). It does so by moving
horizontal blades (flaps) or vertical blades (louvers).
Setting Airflow direction
Vertical automatic
swing
Moves up and down.
Horizontal
automatic swing
Moves from side to side.
+ 3-D airflow
direction
Moves simultaneously up and down and
from side to side
[—] Stays in a fixed position.
CAUTION
▪ ALWAYS use a user interface to adjust the position of
the flaps and louvers. When the flaps and louvers are
swinging and you move them forcibly by hand, the
mechanism will break.
The movable range of the flap varies according to the operation
mode. The flap will stop at the upper position when the airflow rate is
changed to low during the up and down swing setting.
a
bc
aFlap range in cooling or drying operation
bFlap range in heating operation
cFlap range in fan only operation
5.5.1 To adjust vertical airflow direction
1Press .
Result: appears on the LCD. The flaps (horizontal blades)
will begin to swing.
2To use fixed position, press when the flaps reach the
desired position.
Result: disappears from the LCD. The flaps will stop
moving.
5.5.2 To adjust horizontal airflow direction
1Press .
Result: appears on the LCD. The louvers (vertical
blades) will begin to swing.
2To use fixed position, press when the louvers reach the
desired position.
Result: disappears from the LCD. The louvers will stop
moving.
INFORMATION
When the unit is installed in a corner of a room, the
direction of the louvers should be facing away from the
wall. Efficiency will drop if a wall blocks the air.
5.5.3 To use 3-D airflow direction
1Press and .

5 Operation
User reference guide
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Daikin room air conditioner
4P518786-2C – 2018.09
Result: and appear on the LCD. The flaps (horizontal
blades) and louvers (vertical blades) will begin to swing.
2To use fixed position, press and when the flaps
and louvers reach the desired position.
Result: and disappear from the LCD. The flaps and
the louvers will stop moving.
5.6 Comfort airflow and Intelligent eye
operation
You can use Comfort and Intelligent eye operation separately, or
combine them.
5.6.1 Comfort airflow operation
This operation can be used in heating or cooling operation mode. It
will provide a comfortable wind that will NOT come in direct contact
with people. The system automatically sets the fixed airflow position
upward in Cooling and downward in Heating operation mode.
Cooling operation mode Heating operation mode
INFORMATION
Powerful and Comfort airflow operation CANNOT be used
at the same time. The last selected function takes priority.
If the vertical automatic swing is selected, Comfort airflow
operation will be cancelled.
5.6.2 Intelligent eye operation
The system detects movement in the room and automatically adjusts
the airflow direction and temperature in order to avoid direct contact
with people. If no movement is detected for 20minutes, the system
switches to energy saving operation:
Operation Energy saving operation
Heating Temperature is lowered by 2°C.
Cooling and drying If the temperature in the room is:
▪ <30°C, the temperature is raised by 2°C
▪ ≥30°C, the temperature is raised by 1°C
Fan only Decreases airflow rate.
NOTICE
▪ Do NOT hit or push the Intelligent eye sensor. Doing so
may lead to malfunction.
▪ Do NOT place large objects near the Intelligent eye
sensor.
INFORMATION
Powerful or Night set operation CANNOT be used at the
same time with Intelligent eye operation. The last selected
function takes priority.
▪Detection range. Up to 7m.
Vertical angle (side view) Horizontal angle (top view)
90°
7 m
55°
7 m
55°
▪Detection sensitivity. Changes according to location, the number
of persons in the room, temperature range, etc.
▪Detection mistakes. The sensor may mistakenly detect pets,
sunlight, moving curtains, etc.
5.6.3 To start/stop Comfort and Intelligent eye
operation
1Press one or more times.
Result: The setting will change as follows:
Display Operation
Comfort airflow
Intelligent eye
+Comfort airflow and Intelligent eye
— Both deactivated
Note: If there are people close to the front of the indoor unit or there
are too many people, use both operations at the same time.
2To stop operation, press until both symbols disappear
from the LCD.
5.7 Powerful operation
This operation quickly maximizes the cooling/heating effect in any
operation mode. You can get the maximum capacity.
INFORMATION
Powerful operation CANNOT be used together with Econo,
Comfort airflow, Intelligent eye and Outdoor unit quiet
operation. The last selected function takes priority.
Powerful operation will NOT increase the capacity of the
unit if it already operates at maximum capacity.
5.7.1 To start/stop Powerful operation
1Press to start.
Result: is displayed on the LCD. Powerful operation runs
for 20minutes; after that, operation returns to the previously set
mode.
Mode Airflow rate
Cooling/Heating/Automatic ▪ To maximize the cooling/
heating effect, the capacity of
outdoor unit is increased.
▪ The airflow rate is fixed to the
maximum setting and
CANNOT be changed.
▪ The temperature can be set
only in Automatic mode.
Drying ▪ The temperature setting is
lowered by 2.5°C.
▪ The airflow rate is slightly
increased.

5 Operation
User reference guide
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Daikin room air conditioner
4P518786-2C – 2018.09
Mode Airflow rate
Fan only The airflow rate is fixed to the
maximum setting.
2Press to stop.
Result: disappears from the LCD.
Note: Powerful operation can be set only when the unit is running. If
you press , operation will be cancelled; disappears from the
LCD.
5.8 Econo and Outdoor unit quiet
operation
5.8.1 Econo operation
This is a function which enables efficient operation by limiting the
maximum power consumption value. This function is useful for cases
in which attention should be paid to ensure a circuit breaker will not
trip when the product runs alongside other appliances.
INFORMATION
▪ Powerful and Econo operation CANNOT be used at the
same time. The last selected function takes priority.
▪ Econo operation reduces power consumption of the
outdoor unit by limiting the rotation speed of the
compressor. If power consumption is already low,
Econo operation will NOT further reduce power
consumption.
5.8.2 Outdoor unit quiet operation
Use Outdoor unit quiet operation when you want to decrease the
noise level of the outdoor unit. Example: At night.
INFORMATION
▪ Powerful and Outdoor unit quiet operation CANNOT be
used at the same time. The last selected function takes
priority.
▪ This function is only available in Automatic, Cooling,
and Heating operation.
▪ Outdoor unit quiet operation limits the rotation speed of
the compressor. If the rotation speed of compressor is
already low, Outdoor unit quit operation will NOT
further reduce the compressor rotation speed.
5.8.3 To start/stop Econo and Outdoor unit
quiet operation
1Press one or more times.
Result: The setting will change as follows.
Display Operation
Econo
Outdoor unit quiet
+Econo and Outdoor unit quiet
— Both deactivated
2To stop operation, press until both symbols disappear
from the LCD.
Note: Econo operation can be only set when the unit is running.
Pressing cancels the setting and disappears from the LCD.
Note: remains on the LCD, even if you turn off the unit using
the user interface or indoor unit ON/OFF switch.
5.9 Flash streamer air cleaning
operation
Streamer generates a high-speed electron stream with a high
oxidizing power, reducing bad odours and viruses. Together with the
titanium apatite deodorizing filter and the air filters, this function
cleans the air in the room.
INFORMATION
▪ The high-speed electrons are generated and go away
inside the unit to ensure safe operation.
▪ The Streamer discharge may generate a fizzing sound.
▪ If the airflow becomes weak, the Streamer discharge
may stop temporarily to prevent ozone smell.
5.9.1 To start/stop Flash Streamer operation
1Press .
Result: is displayed on the LCD and the air in the room is
cleaned.
2To stop operation, press .
Result: disappears from the LCD and operation stops.
5.10 OFF/ON timer operation
Timer functions are useful for automatically switching the air
conditioner on/off at night or in the morning. You can also use OFF
timer and ON timer in combination.
INFORMATION
Program the timer again in case of:
▪ A breaker has turned the unit off.
▪ A power failure.
▪ After replacing batteries in the user interface.
INFORMATION
The clock MUST be set correctly before using any timer
functions. Refer to "4.4.1To set the clock"on page6.
5.10.1 To start/stop OFF timer operation
1Press to start.
Result: is displayed on the LCD, the timer lamp lights
up, and blinks. and the day of the week disappear from
the LCD.
2Press or to change the time setting.
3Press again.
Result: and the set time are displayed on the LCD.
Result: The timer lamp lights up.
INFORMATION
Each time or is pressed, the time setting
advances by 10 minutes. Holding the button down will
change the setting rapidly.
4To stop operation, press .

5 Operation
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Result: and disappear from the LCD and the timer
lamp goes off. and the day of the week are displayed on the LCD.
INFORMATION
When you set the ON/OFF timer, the time setting is stored
in the memory. The memory will be reset when the user
interface batteries are replaced.
Use of night set mode in combination with OFF timer
The air conditioner automatically adjusts the temperature
setting (0.5°C up in cooling, 2.0°C down in heating) to
prevent excessive cooling/heating and ensure a
comfortable sleeping temperature.
5.10.2 To start/stop ON timer operation
1Press to start.
Result: is displayed on the LCD, the timer lamp lights
up, and blinks. and the day of the week disappear from
the LCD.
2Press or to change the time setting.
3Press again.
Result: and the set time are displayed on the LCD. The timer
lamp lights up.
INFORMATION
Each time or is pressed, the time setting
advances by 10 minutes. Holding the button down will
change the setting rapidly.
4To stop operation, press .
Result: and disappear from the LCD and the timer
lamp goes off. and the day of the week are displayed on the
LCD.
5.10.3 To combine OFF timer and ON timer
1To set the timers, refer to "5.10.1 To start/stop OFF timer
operation" on page 10 and "5.10.2 To start/stop ON timer
operation"on page11.
Result: and are displayed on the LCD.
Example:
Display Current time Set while… Operation
6:00 the unit is
operating.
Stops at 7:00
and starts at
14:00.
the unit is NOT
operating.
Starts at 14:00.
Note: If the timer setting is active, the current time is NOT displayed
on the LCD.
5.11 Weekly timer operation
With this operation, you can save up to 4 timer settings for each day
of the week.
Example: Create a different setting from Monday to Friday and a
different setting for weekends.
Day of the week Setting example
Monday
▪ Make up to 4settings.
6:00 8:30 17:30
25°C 27°C
22:00
1 2 3 4
ON OFF ON OFF
Tuesday~Friday
▪ Use the copy mode if the
settings are the same as
for Monday.
6:00 8:30 17:30
25°C 27°C
22:00
1 2 3 4
ON OFF ON OFF
Saturday
▪ No timer setting
—
Sunday
▪ Make up to 4settings.
8:00 10:00 19:00 21:00
27°C 27°C25°C
ON OFF OFF ON
1 2 3 4
▪ON-ON-ON-ON setting. Enables scheduling the operation mode
and set temperature.
▪OFF-OFF-OFF-OFF setting.Only the turn off time can be set for
each day.
Note: Be sure to aim the user interface at the indoor unit and check
for a receiving tone when setting the Weekly timer operation.
INFORMATION
The clock MUST be set correctly before using any timer
functions. Refer to "4.4.1To set the clock"on page6.
INFORMATION
▪ Weekly timer and ON/OFF timer operation CANNOT be
used at the same time. The ON/OFF timer operation
takes priority. Weekly timer will be in standby,
disappears from the LCD. When the ON/OFF timer is
completed, the Weekly timer becomes active.
▪ The day of the week, ON/OFF timer mode, time and
temperature (only for ON timer) can be set with the
Weekly timer. Other settings are based on previous ON
timer setting.
5.11.1 To set Weekly timer operation
1Press .
Result: The day of the week and the reservation number of the
current day are displayed.
2Press or to select the day of the week and the
reservation number.
3Press .
Result: The day of the week is set. and blink.
4Press or to select the mode.
Result: The setting will change as follows:
Display Feature
ON timer
OFF timer
Blank Deletes reservation

5 Operation
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5Press .
Result: The ON/OFF timer mode is set. and the time
blink.
Note: Press to return to the previous screen. If blank is
selected, continue to step 9.
6Press or to select the time. The time can be set
between 0:00~23:50 in 10-minute intervals.
7Press .
Result: The time is set and and the temperature
blink.
Note: Press to return to the previous screen. If OFF timer
is selected, continue to step 9.
8Press or to select the desired temperature.
Note: The set temperature for the weekly timer is displayed only
when setting the weekly timer mode.
INFORMATION
The temperature can be set between 10~32°C on the user
interface. In cooling and automatic operation mode, the
unit will operate at minimum 18°C even if is set at
10~17°C. In heating operation mode, the unit will operate
at maximum 30°C even if is set at 31~32°C.
9Press .
Result: The temperature and time are set for the ON timer. The
time is set for the OFF timer. The timer lamp lights orange.
Result: A new reservation screen will appear.
10 Repeat the previous procedure to set another reservation or
press to complete the setting.
Result: is displayed on the LCD.
Note: A reservation can be copied with the same settings to another
day. Refer to "5.11.2To copy reservations"on page12.
5.11.2 To copy reservations
A reservation can be copied to another day. The complete
reservation of the selected day of the week will be copied.
1Press .
2Press or to select the day of the week to be copied.
3Press .
Result: The reservation of the selected day of the week will be
copied.
4Press or to select the destination day.
5Press .
Result: The whole reservation is copied to the selected day and the
timer lamp lights orange.
Note: To copy to another day, repeat the procedure.
6Press to complete the setting.
Result: is displayed on the LCD.
Note: To change the reservation setting after copying, refer to
"5.11.1To set Weekly timer operation"on page11.
5.11.3 To confirm reservations
You can confirm if all reservations are set to your needs.
1Press .
Result: The day of the week and the reservation number of the
current day are displayed.
2Press or to select the day of the week and reservation
number to be confirmed and check the reservation details.
Note: To change the reservation setting, refer to "5.11.1 To set
Weekly timer operation"on page11.
3Press to exit the confirmation mode.
5.11.4 To deactivate and reactivate Weekly timer
operation
1To deactivate the Weekly timer, press while
is displayed on the LCD.
Result: disappears from the LCD and the timer lamp goes
off.
2To reactivate the Weekly timer, press again.
Result: The last set reservation mode will be used.
5.11.5 To delete reservations
To delete individual reservations
Use this function if you want to delete a single reservation setting.
1Press .
Result: The day of the week and the reservation number are
displayed.
2Press or to select the day of the week to be deleted.
3Press .
Result: , , and blink.
4Press or and select "blank".
Result: The setting will change as follows:
5Press .
Result: The selected reservation is deleted.
6Press to exit.
Result: Remaining reservations will be active.

5 Operation
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To delete a reservation for each day of the week
Use this function of you want to delete all reservation settings for
one day of the week. This can be used in confirmation or setting
mode.
1Press or to select the day of the week to be deleted.
2Hold for about 5seconds.
Result: All reservations for the selected day will be deleted.
To delete all reservations
Use this function if you want to delete all reservations for all days of
the week in one go. This procedure CANNOT be used in the setting
mode.
1Hold for about 5seconds while in the default display.
Result: All reservations will be deleted.
5.12 Wireless LAN connection
The customer is responsible for providing:
▪ Smartphone, tablet or another smart device with one of the
following operating systems:
▪ Android 4.0.3 or later
▪ iOS 7.1.2 or later
▪ Internet line and communication device, such as a modem, router,
etc.
▪ Wireless LAN access point
▪ Installed free Daikin Online Controller application
5.12.1 Precautions when using the wireless
adapter
Do NOT use near:
▪Medical equipment. E.g. persons using cardiac pacemakers or
defibrillators. This product may cause electromagnetic
interference.
▪Auto-control equipment. E.g. automatic doors or fire alarm
equipment. This product may cause faulty behaviour of the
equipment.
▪Microwave oven. It may affect wireless LAN communications.
5.12.2 To install the Daikin Online Controller
application
1Open:
▪ Google Play for appliances using Android.
▪ App Store for appliances using iOS.
2Search for Daikin Online Controller.
3Follow the directions on the screen to install.
5.12.3 Wireless adapter components
a
b
c
d
e
aRUN lamp (orange)
bAP lamp (yellow)
cSETUP button
dMODE button
ePOWER button
Purpose
RUN Lights when connecting to a router (Wireless LAN
access point).
AP Lights when connected directly to a smartphone.
SETUP Use when connecting to a router (Wireless LAN
access point).
MODE Switches modes (RUN/AP) when held down.
POWER Turns the WLAN adapter ON or OFF when pressed.
5.13 About Multi system
In Multi system, 1 outdoor unit is connected to multiple indoor units.
A B
C D
5.13.1 Priority room setting
Priority room setting requires initial programming during installation.
Please consult your authorized dealer for assistance.
When priority room setting is inactive or not
present
When more than 1 indoor unit is operating, priority is given to the
first unit that was turned on. Set other units to the same operation
mode. Otherwise, they will enter the standby mode, and the
operation lamp will flash (does NOT indicate malfunction).
Exceptions: If the first unit that was turned on is set to fan only,
and then in the other room heating mode is set, priority will be given
to the unit set to the heating mode. The first unit will go in standby
and the operation lamp will flash.
INFORMATION
▪ The cooling, drying, and fan only operation modes may
be used at the same time.
▪ The automatic operation mode automatically selects
cooling or heating, depending on the room
temperature. If the automatic operation mode is
selected for all units, all units will operate in the mode
of the first unit that was turned on.
Priority when using Outdoor unit quiet operation
Refer to "5.8.2Outdoor unit quiet operation"on page10.
1Set Outdoor unit quiet operation in all rooms using the user
interfaces of the units.
2To cancel Outdoor unit quiet operation, you may stop operation
in 1 room using a user interface.
Result: Operation will stop in all rooms. will remain on the
display of the other user interfaces.
3To remove the symbol from the other user interfaces, stop
Outdoor unit quiet operation in all rooms separately.
Result: The symbol will disappear.

6 Energy saving and optimum operation
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When priority room setting is active
You can select a different operation mode for each room.
Example: Room A has priority, cooling operation mode is selected.
Operation mode in room
B, C, D
Status of room B, C and D
Cooling, drying or fan only Current operation mode maintained
Heating Standby mode. Operation resumes
when room A stops operating.
Automatic If cooling operation continues. If
heating units enter standby mode.
Operation resumes when room A stops
operating.
Priority when using Powerful operation
Example: Room A has priority. Rooms B, C and D are operating.
1Set Powerful operation in room A.
Result: Capacity in room A is increased. Cooling or heating
efficiency in rooms B, C and D may be slightly reduced.
Priority when using Outdoor unit quiet operation
Example: Room A has priority.
2Set Outdoor unit quiet operation on one unit.
Result: All units enter the Outdoor unit quiet operation mode at
once.
5.13.2 Night quiet mode
The Night quiet mode requires initial programming during
installation. Please consult your dealer for assistance. This mode
reduces the operation noise of the outdoor unit during the night by
reducing the cooling efficiency.
The Night quiet mode is activated automatically when the
temperature drops ≥5°C below the highest temperature recorded
that day.
5.13.3 Cooling/heating mode lock
The Cooling/heating mode lock requires initial programming during
installation. Please consult your authorized dealer for assistance.
The Cooling/heating mode lock sets the unit forcibly to either cooling
or heating operation. Activate this function if you wish to set all
indoor units connected In a multi-system to 1 operation mode.
INFORMATION
The Cooling/heating mode lock CANNOT be activated
together with the priority room setting.
6 Energy saving and optimum
operation
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.
CAUTION
NEVER expose little children, plants or animals directly to
the airflow.
WARNING
Do NOT place objects below the indoor and/or outdoor unit
that may get wet. Otherwise condensation on the unit or
refrigerant pipes, air filter dirt or drain blockage may cause
dripping, and objects under the unit may get dirty or
damaged.
NOTICE
Do NOT use the system for other purposes. In order to
avoid any quality deterioration, do NOT use the unit for
cooling precision instruments, food, plants, animals, or
works of art.
CAUTION
Do NOT operate the system when using a room
fumigation-type insecticide. Chemicals could collect in the
unit, and endanger the health of people who are
hypersensitive to chemicals.
WARNING
Do NOT place a flammable spray bottle near the air
conditioner and do NOT use sprays. Doing so may result in
a fire.
Observe the following precautions to ensure the system operates
properly.
▪ Prevent direct sunlight from entering a room during cooling
operation by using curtains or blinds.
▪ Ventilate often. Extended use requires special attention to
ventilation.
▪ Keep doors and windows closed. If the doors and windows remain
open, air will flow out of your room causing a decrease in the
cooling or heating effect.
▪ Be careful NOT to cool or heat too much. To save energy, keep
the temperature setting at a moderate level.
▪ NEVER place objects near the air inlet or the air outlet of the unit.
Doing so may cause a reduced heating/cooling effect or stop
operation.
▪ Turn off the main power supply switch to the unit when the unit is
NOT used for longer periods of time. If the main power supply
switch is on, the unit consumes electricity. Before restarting the
unit, turn on the main power supply switch 6 hours before
operation to ensure smooth running.
▪ Condensation may form if the humidity is above 80% or if the
drain outlet gets blocked.
▪ Adjust the room temperature properly for a comfortable
environment. Avoid excessive heating or cooling. Notice that it
may take some time for the room temperature to reach the set
temperature. Consider using the timer setting options.
▪ Adjust the air flow direction to avoid cool air from gathering on the
floor or warm air against the ceiling. (Up during cooling or dry
operation to the ceiling and down during heating operation.)
▪ Avoid direct air flow to room inhabitants.
▪ Operate the system within the recommended temperature range
(26~28°C for cooling and 20~24°C for heating) to save energy.
7 Maintenance and service
7.1 Overview: Maintenance and
service
The installer has to perform a yearly maintenance.

7 Maintenance and service
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About the refrigerant
This product contains fluorinated greenhouse gases. Do NOT vent
gases into the atmosphere.
Refrigerant type: R32
Global warming potential (GWP) value: 675
NOTICE
In Europe, the greenhouse gas emissions of the total
refrigerant charge in the system (expressed as tonnes CO2
equivalent) is used to determine the maintenance intervals.
Follow the applicable legislation.
Formula to calculate the greenhouse gas emissions:
GWP value of the refrigerant × Total refrigerant charge [in
kg] / 1000
Please contact your installer for more information.
WARNING
The refrigerant inside the unit is mildly flammable, but
normally does NOT leak. If the refrigerant leaks in the
room and comes in contact with fire from a burner, a
heater, or a cooker, this may result in fire, or the formation
of a harmful gas.
Turn off any combustible heating devices, ventilate the
room, and contact the dealer where you purchased the
unit.
Do NOT use the unit until a service person confirms that
the part from which the refrigerant leaked has been
repaired.
WARNING
▪ Do NOT pierce or burn refrigerant cycle parts.
▪ Do NOT use cleaning materials or means to accelerate
the defrosting process other than those recommended
by the manufacturer.
▪ Be aware that the refrigerant inside the system is
odourless.
WARNING
The appliance shall be stored in a room without
continuously operating ignition sources (example: open
flames, an operating gas appliance or an operating electric
heater).
NOTICE
Maintenance MUST be done by an authorized installer or
service agent.
We recommend performing maintenance at least once a
year. However, applicable legislation might require shorter
maintenance intervals.
DANGER: RISK OF ELECTROCUTION
To clean the air conditioner or air filter, be sure to stop
operation and turn all power supplies off. Otherwise, an
electric shock and injury may result.
WARNING
To prevent electric shocks or fire:
▪ Do NOT rinse the unit.
▪ Do NOT operate the unit with wet hands.
▪ Do NOT place any objects containing water on the unit.
CAUTION
After a long use, check the unit stand and fitting for
damage. If damaged, the unit may fall and result in injury.
CAUTION
Do NOT touch the heat exchanger fins. These fins are
sharp and could result in cutting injuries.
WARNING
Be careful with ladders when working in high places.
7.2 To clean the indoor unit and user
interface
NOTICE
▪ Do NOT use gasoline, benzene, thinner polishing
powder or liquid insecticide. Possible consequence:
Discoloration and deformation.
▪ Do NOT use water or air of 40°C or higher. Possible
consequence: Discoloration and deformation.
▪ Do NOT use polishing compounds.
▪ Do NOT use a scrubbing brush. Possible
consequence: The surface finishing peels off.
DANGER: RISK OF ELECTROCUTION
Before cleaning, be sure to stop the operation, turn the
breaker off or pull out the supply cord. Otherwise, an
electric shock and injury may result.
1Clean with a soft cloth. If it is difficult to remove stains, use
water or a neutral detergent.
7.3 To clean the front panel
1Clean the front panel with a soft cloth. If it is difficult to remove
stains, use water or a neutral detergent.
7.4 To remove the front panel
1Hold the front panel by the panel tabs on both sides and open
it.
a
aPanel tabs
2Remove the front panel by sliding it to the left or the right and
pulling it toward you.
Result: The front panel shaft on 1 side will be disconnected.
3Disconnect the front panel shaft on the other side in the same
manner.
a
aFront panel shaft

7 Maintenance and service
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7.5 About the air filters
Operating the unit with dirty filters means that the filter:
▪ CANNOT deodorize the air,
▪ CANNOT clean the air,
▪ poor heating/cooling,
▪ causes odour.
7.6 To clean the air filters
1Push the tab at the centre of each air filter, then pull it down.
2Pull out the air filters.
2
1
Note: (class 50) The titanium apatite deodorizing filter MUST be
removed before cleaning the air filter.
3Remove the titanium apatite deodorizing filter from all 4 claws.
aClaw
4Wash the air filters with water or clean them with a vacuum
cleaner.
5Soak in lukewarm water for about 10 to 15 minutes.
INFORMATION
▪ If the dust does NOT come off easily, wash them with a
neutral detergent diluted in lukewarm water. Dry the air
filters in the shade.
▪ It is recommended to clean the air filters every 2
weeks.
7.7 To clean the titanium apatite
deodorizing filter
INFORMATION
Clean the filter with water every 6 months.
1Remove the titanium apatite deodorizing filter from the tabs
(class 20~35) or all 4 claws (class 50).
Class 20~35
Class 50
aClaw
2Remove the dust from the filter with a vacuum cleaner.
3Soak the filter for 10 to 15minutes in warm water.
Note: (class 50) Do NOT remove the filter from the frame.
Class 20~35 Class 50
4After washing, shake off remaining water and dry the filter in the
shade. Do NOT wring out the filter when removing water.
7.8 To replace the titanium apatite
deodorizing filter
INFORMATION
Replace the filter every 3 years.
1Remove the filter from the tabs (class 20~35) or frame (class
50) and replace the filter with a new one.

8 Troubleshooting
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Class 20~35 Class 50
INFORMATION
▪ Do NOT throw away the filter frame, but use it again.
▪ Dispose of the old filter as non-flammable waste.
To order titanium apatite deodorizing filters, contact your dealer.
Item Part number
Titanium deodorizing filter 1 set KAF970A46
7.9 To re-install the front panel
1Attach the front panel. Align the shafts with the slots and push
them all the way in.
2Close the front panel slowly; press at both sides and at the
centre.
7.10 To take following items into
account before a long idle period
Operate the unit several hours in fan only mode to dry the inside of
the unit.
1Press and select operation.
2Press and start operation.
3After operation stops, turn the breaker off.
4Clean the air filters and replace them in their original position.
5Remove the batteries from the user interface.
INFORMATION
It is recommended to have periodical maintenance
performed by a specialist. For specialist maintenance,
contact your dealer. Maintenance costs shall be borne by
the customer.
In certain operating conditions the inside of the unit may
get dirty after several seasons of use. This results in poor
performance.
8 Troubleshooting
If one of the following malfunctions occur, take the measures shown
below and contact your dealer.
WARNING
Stop operation and shut off the power if anything
unusual occurs (burning smells etc.).
Leaving the unit running under such circumstances may
cause breakage, electric shock or fire. Contact your dealer.
The system MUST be repaired by a qualified service person.
Malfunction Measure
If a safety device such as a fuse, a
breaker or an earth leakage breaker
frequently actuates or the ON/OFF
switch does NOT properly work.
Turn OFF the main power
switch.
If water leaks from the unit. Stop the operation.
The operation switch does NOT work
well.
Turn OFF the power
supply.
If the user interface display indicates the
unit number, the operation lamp flashes
and the malfunction code appears.
Notify your installer and
report the malfunction
code.
If the system does NOT properly operate except for the above
mentioned cases and none of the above mentioned malfunctions is
evident, investigate the system according to the following
procedures.
Malfunction Measure
If the system does
NOT operate at all.
▪ Check if there is no power failure. Wait
until power is restored. If a power failure
occurs during operation, the system
automatically restarts immediately after
power is restored.
▪ Check if no fuse has blown or breaker is
activated. Change the fuse or reset the
breaker if necessary.
▪ Check the batteries of the user interface.
▪ Check the timer setting.
The system suddenly
stops operating.
▪ Check if the air inlet or outlet of the
outdoor or indoor unit is NOT blocked by
obstacles. Remove any obstacles and
make sure the air can flow freely.
▪ The air conditioner may stop operating
after sudden large voltage fluctuations to
protect the system. It automatically
resumes operation after about 3minutes.
The fan will stop during
airflow operation.
If the set temperature is reached, the
airflow rate is reduced and operation stops.
Operation will resume automatically when
the indoor temperature rises or falls.
The flaps do NOT start
to swing immediately.
The indoor unit is adjusting the position of
the flaps. The flaps will start moving soon.
Operation does NOT
start soon.
In case the ON/OFF button was pressed
right after operation was stopped or if the
mode was changed. Operation will start
after 3minutes to protect the system.

8 Troubleshooting
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Malfunction Measure
The system operates,
but cooling or heating
is insufficient.
▪ Check the airflow rate setting. Refer to
"5.4Airflow rate"on page8.
▪ Check the temperature setting. Refer to
"5.3.1 To start/stop operation and to set
the temperature"on page8.
▪ Check if the airflow direction setting is
appropriate. Refer to "5.5 Airflow
direction"on page8.
▪ Check if the air inlet or outlet of the
outdoor or indoor unit is NOT blocked by
obstacles. Remove any obstacles and
make sure the air can flow freely.
▪ Check if the air filters are clogged. Clean
the air filters. See "7 Maintenance and
service"on page14.
▪ Check for open doors or windows. Close
doors and windows to prevent wind from
coming in.
▪ Check if the unit operates in Econo or
Outdoor unit quiet operation. Refer to
"5.8 Econo and Outdoor unit quiet
operation"on page10.
▪ Check if there is any furniture directly
under or next to the indoor unit. Move the
furniture.
The system operates,
but heating is
insufficient (air is NOT
blown from the unit).
▪ The air conditioner may be warming up
for heating operation. Wait for 1 to 4
minutes.
▪ If a flowing sound is heard, the outdoor
unit may be in defrost operation. Wait for
4 to 12 minutes.
The ON/OFF timer
does NOT operate
according to the
settings.
▪ Check if the Weekly timer and ON/OFF
timer are set to the same time. Change
or deactivate the setting. Refer to
"5.10 OFF/ON timer operation" on
page 10 and "5.11 Weekly timer
operation"on page11.
▪ Check if the clock and the day of the
week are set correctly. Refer to
"4.4Clock"on page6.
Cooling operation
CANNOT be selected.
Check if your system is NOT heating only
version.
An abnormal function
happens during
operation.
The air conditioner may malfunction
because of lightning or radio waves. Turn
the breaker OFF and back ON.
The unit does NOT
receive signals from
the user interface.
▪ Check the batteries of the user interface.
Refer to "4.2 To insert the batteries" on
page6.
▪ Make sure that the transmitter is NOT
exposed to direct sunlight.
▪ Check if there are any electronic starter
type fluorescent lamps in the room.
Contact your dealer.
The user interface
display is blank.
Replace the batteries of the user interface.
An error code is
displayed on the user
interface.
Consult your local dealer. Refer to
"8.2Solving problems based on error
codes"on page19 for a detailed list of
error codes.
Other electric
appliances start to
operate.
If the user interface signals operate other
electric appliances, move the other
appliances away, and contact your dealer.
If after checking all above items, it is impossible to fix the problem
yourself, contact your installer and state the symptoms, the complete
model name of the unit (with manufacturing number if possible) and
the installation date (possibly listed on the warranty card).
8.1 Symptoms that are NOT system
malfunctions
The following symptoms are NOT system malfunctions:
8.1.1 Symptom: A sound like water flowing is
heard
▪ This sound is caused by the refrigerant flowing in the unit.
▪ This sound may be generated when water is flowing away from
the unit during cooling or drying operation.
▪ The refrigerant flows in the air conditioner even if the indoor unit is
turned off and an indoor unit in another room is operating.
8.1.2 Symptom: A blowing sound is heard
This sound is generated when the direction of the refrigerant flow is
changed (e.g. when switching from cooling to heating).
8.1.3 Symptom: A ticking sound is heard
This sound is generated when the unit slightly expands or contracts
with changes in temperature.
8.1.4 Symptom: A whistling sound is heard
This sound is generated by the refrigerant flowing during defrost
operation.
8.1.5 Symptom: A clicking sound during
operation or idle time is heard
This sound is generated when the refrigerant control valves or
electrical parts operate.
8.1.6 Symptom: A clapping sound is heard
This sound is generated when an external device sucks air out of the
room (e.g. exhaust fan, extractor hood) while the doors and windows
in the room are closed. Open the doors or windows, or turn off the
device.
8.1.7 Symptom: White mist comes out of a unit
(Indoor unit, outdoor unit)
When the system is changed over to heating operation after defrost
operation. Moisture generated by defrost becomes steam and is
exhausted.
8.1.8 Symptom: The units can give off odours
The unit can absorb the smell of rooms, furniture, cigarettes, etc.,
and then emit it again.
8.1.9 Symptom: The outdoor fan rotates while
the air conditioner is not in operation
▪After operation has stopped. The outdoor fan continues to
rotate for another 30 seconds for system protection.
▪While the air conditioner is not in operation. When the outdoor
temperature is very high, the outdoor fan starts to rotate for
system protection.

8 Troubleshooting
User reference guide
19
ATXM20~50N2V1B
Daikin room air conditioner
4P518786-2C – 2018.09
8.2 Solving problems based on error
codes
When a problem happens, an error code appears on the user
interface. It is important to understand the problem and to take
measures before resetting an error code. This should be done by a
licensed installer or by your local dealer.
This chapter gives you an overview of all error codes and the
content of the error code as it appears on the user interface.
For a more detailed troubleshooting guideline for each error, please
see the service manual.
Fault diagnosis by user interface
The user interface can receive an error code from the indoor unit
referring to the fault. It is important to understand the problem and
take measures before resetting the error code. This should be done
by a licensed installer or your local dealer.
To see 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.
System
Error code Description
Normal
Refrigerant shortage
Overvoltage detection
Signal transmission error (between indoor and
outdoor unit)
Indoor/outdoor unit combination fault
Indoor unit
Error code Description
Indoor unit PCB abnormality
Freeze-up protection or high-pressure control
Fan motor (DC motor) abnormality
Indoor heat exchanger thermistor abnormality
Room temperature thermistor abnormality
Outdoor unit
Error code Description
4-way valve abnormality
Outdoor unit PCB abnormality
Overload activation (compressor overload)
Compressor lock
DC fan lock
Discharge pipe temperature control
High-pressure control (in cooling mode)
Compressor system sensor abnormality
Position sensor abnormality
DC voltage / current sensor abnormality
Error code Description
Outdoor temperature thermistor abnormality
Discharge pipe thermistor abnormality
Outdoor heat exchanger thermistor abnormality
Electrical parts heat error
Radiation fin temperature rise
Inverter instantaneous overcurrent (DC)
Radiation fin thermistor abnormality
8.3 Troubleshooting for wireless
connection adapter
The following table provides a brief description of how to deal with
some problems. If none of the following solutions fix the problem, go
to http://www.onlinecontroller.daikineurope.com/ for more
information and FAQ.
Problem Measure
None of the LEDs light ▪ Try operating the unit with the
user interface.
▪ Turn the unit off and then back
on.
▪ Make sure the LEDs are not
disabled in the application.
▪ Check if the adapter is
installed correctly.
The Wireless LAN adapter is not
visible on the unit overview
screen ("Home" screen) after the
Wireless LAN adapter has been
configured.
▪ Check that the power is on.
▪ Check that the RUN LED is lit.
▪ If the AP LED is lit, press the
MODE buttton for 2seconds to
switch to RUN mode.
▪ If the RUN LED is blinking, try
connecting the WLAN adapter
to the wireless network again.
Make sure the Wireless LAN
adapter is close enough to the
router (Wireless LAN access
point).
▪ If the RUN LED is lit, make
sure that the smartphone or
tablet is connected to the
same wireless LAN network as
the Wireless LAN adapter.
When trying to make a direct
connection to the adapter (AP
mode), the Wireless LAN adapter
is not visible in the available Wi-
Fi networks list of the phone/
tablet.
▪ If the AP LED is not lit, press
the MODE button for
2 seconds to switch to AP
mode.
▪ If the AP LED is blinking,
please wait until the AP LED is
lit (approximately 1 minute).
The Wireless LAN adapter is
still starting up.
▪ If the AP LED is lit, switch to
RUN mode by pressing the
MODE button for 2 seconds.
Now switch back to AP mode
by pressing the MODE button
again for 2 seconds. This
procedure will change the
wireless channel on which the
Wireless LAN adapter is
operating. Repeat if
necessary.

9 Disposal
User reference guide
20
ATXM20~50N2V1B
Daikin room air conditioner
4P518786-2C – 2018.09
8.4 Solving problems based on the LED on the outdoor unit
LED color Normal status
Green Flashing
Red Off
On
Flashing
Off
— Any status
LED on outdoor unit printed circuit board for 2AMXM series
Green Diagnosis
Micro-computer normal / LED-A
Normal, check indoor unit
Turn the power off and on again. If the LED display recurs, the outdoor
unit PCB is faulty.
Power supply fault(a)
(a) May NOT apply in some cases. Refer to the service manual.
LED on outdoor unit printed circuit board for 3AMXM series
Green Red Diagnosis
Micro-
computer
normal
Malfunction detection
LED-A LED1 LED2 LED3 LED4
Normal, check indoor unit
High-pressure protector (on condenser) or low-pressure protector (on
evaporator) activated or indoor unit heat exchanger is frozen up while the unit
was operating or was in standby mode
Overload relay activated or high discharge pipe temperature(a)
Faulty start of the compressor
Input overcurrent
Thermistor or current transformer abnormality(a)
High temperature of the switchbox
High temperature at Inverter circuit heatsink
Output overcurrent(a)
Refrigerant shortage(a)
Low voltage to main circuit or momentary voltage loss
Reversing solenoid valve switching failure
Fan motor fault
— — — — Turn the power off and on again. If the LED display recurs, the outdoor unit
PCB is faulty.
— — — — Power supply fault(a)
(a) May NOT apply in some cases. Refer to the service manual.
9 Disposal
NOTICE
Do NOT try to dismantle the system yourself: dismantling
of the system, treatment of the refrigerant, oil and other
parts MUST comply with applicable legislation. Units
MUST be treated at a specialised treatment facility for
reuse, recycling and recovery.
10 Glossary
Dealer
Sales distributor for the product.
Authorized installer
Technical skilled person who is qualified to install the
product.