LG RNU09GTRE4 Series User manual

OWNER'S MANUAL
AIR CONDITIONER
Read this owner’s manual thoroughly before operating the
appliance and keep it handy for reference at all times.
ENGLISH
ARNU05GTRB4 ARNU05GTRD4 ARNU07GTRB4 ARNU07GTRD4 ARNU09GTRB4 ARNU09GTRD4 ARNU12GTRB4
ARNU12GTRD4 ARNU15GTQB4 ARNU15GTQD4 ARNU18GTQB4 ARNU18GTQD4 ARNU21GTQB4 ARNU21GTQD4
ARNU24GTPC4 ARNU28GTPC4 ARNU30GTPC4 ARNU36GTNC4 ARNU42GTMC4 ARNU48GTMC4 ARNU54GTMC4
ARNU24GTPC4 ARNU28GTPC4 ARNU30GTPC4 ARNU36GTNC4 ARNU42GTMC4 ARNU48GTMC4 ARNU54GTMC4
ARNU24GTBB4 ARNU28GTBB4 ARNU30GTBB4 ARNU36GTAB4 ARNU42GTAB4 ARNU48GTAB4 ARNU24GTYA4
ARNU36GTYA4 ARNU48GTYA4 AMNW09GTRA1 AMNW12GTRA1 AMNW18GTQA1 AMNW24GTPA1 AMNW24GTBA0
*RNU05GTR*4 *RNU07GTR*4 *RNU09GTR*4 *RNU09GTRE4 *RNU09GTRF4 *RNU12GTR*4 *RNU15GTQ*4
*RNU15GTR*4 *RNU18GTQ*4 *RNU21GTQ*4 *RNU24GTP*4 *RNU28GTP*4 *RNU30GTP*4 *RNU36GTN*4
*RNU42GTM*4 *RNU48GTM*4 *RNU54GTM*4 *RNU24GTBB4 *RNU28GTBB4 *RNU30GTBB4 *RNU36GTAB4
*RNU42GTAB4 *RNU48GTAB4 *RNU24GTYA4 *RNU36GTYA4 *RNU48GTYA4 * : A, C
MFL72017409
Rev.00_050423
www.lg.com
Copyright © 2023 LG Electronics Inc. All Rights Reserved.

TABLE OF CONTENTS
This manual may contain images or
content that may be different from the
model you purchased.
This manual is subject to revision by the
manufacturer.
SAFETY INSTRUCTIONS
READ ALL INSTRUCTIONS BEFORE USE .................................................... 4
Safety Messages...................................................................................................4
Notes for Flammable Refrigerant ......................................................................5
WARNING INSTRUCTIONS ......................................................................... 5
Technical Safety....................................................................................................5
Installation ............................................................................................................6
Operation ..............................................................................................................8
Wireless Remote Control.....................................................................................9
Maintenance .........................................................................................................9
Refrigerant ............................................................................................................9
CAUTION INSTRUCTIONS ........................................................................ 11
Installation ..........................................................................................................11
Operation ............................................................................................................12
Maintenance .......................................................................................................12
OPERATION
Before Use ................................................................................................. 14
Notes for Operation...........................................................................................14
Suggestions for Energy Saving.........................................................................14
Product Overview..................................................................................... 15
4 Way Cassette ...................................................................................................15
Display .................................................................................................................16
Auto Restart Function........................................................................................16
Using the Appliance with Remote Control......................................................17
SMART FUNCTIONS
LG ThinQ Application ............................................................................... 18
LG ThinQ Application Features.........................................................................18
Before Using LG ThinQ Application .................................................................18
Installing LG ThinQ Application........................................................................19
Open Source Software Notice Information ....................................................19
Radio Equipment Specifications.......................................................................19

MAINTENANCE
Cleaning..................................................................................................... 20
Cleaning Interval ................................................................................................20
Cleaning the Air Filter ........................................................................................21
Cleaning the PM1.0 Sensor...............................................................................27
Tips for Maintenance ............................................................................... 27
Before Long Periods of Disuse .........................................................................27
After Long Periods of Disuse ............................................................................28
TROUBLESHOOTING
Before Calling for Service ........................................................................ 29
Operation ............................................................................................................29
Performance .......................................................................................................32
Wi-Fi .....................................................................................................................33
Calling for Service .................................................................................... 33
Situations in which Calling for Service is Necessary ......................................33
APPENDIX
Information............................................................................................... 34
Specifications......................................................................................................34
Specifications......................................................................................................35

4
SAFETY INSTRUCTIONS
SAFETY INSTRUCTIONS
READ ALL INSTRUCTIONS BEFORE USE
The following safety guidelines are intended to prevent unforeseen
risks or damage from unsafe or incorrect operation of the appliance.
The guidelines are separated into ‘WARNING’ and ‘CAUTION’ as
described below.
Safety Messages
This symbol is displayed to indicate matters and operations
that can cause risk.
Read the part with this symbol carefully and follow the
instructions in order to avoid risk.
WARNING
This indicates that the failure to follow the instructions can
cause serious injury or death.
CAUTION
This indicates that the failure to follow the instructions can
cause the minor injury or damage to the product.

5
SAFETY INSTRUCTIONS
ENGLISH
Notes for Flammable Refrigerant
The following symbols are displayed on units.
WARNING INSTRUCTIONS
WARNING
• To reduce the risk of explosion, fire, death, electric shock, injury or
scalding to persons when using this product, follow basic
precautions, including the following:
Technical Safety
• 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.
• This appliance is not intended for use by persons (including children)
with reduced physical, sensory or mental capabilities, or lack of
experience and knowledge, unless they have been given supervision
or instruction concerning use of the appliance by a person
responsible for their safety. Children should be supervised to ensure
that they do not play with the appliance.
This symbol indicates that this appliance uses a flammable
refrigerant. If the refrigerant is leaked and exposed to an
external ignition source, there is a risk of fire.
This symbol indicates that the Owner's Manual should be read
carefully.
This symbol indicates that service personnel should be handling
this equipment with reference to the Installation Manual.
This symbol indicates that information is available in the Owner's
Manual or Installation Manual.

6
SAFETY INSTRUCTIONS
• Installation or repairs made by unauthorized persons can pose
hazards to you and others.
• The information contained in the manual is intended for use by a
qualified service technician who is familiar with the safety procedures
and equipped with the proper tools and test instruments.
• Failure to read and follow all instructions in this manual can result in
equipment malfunction, property damage, personal injury and/or
death.
• The refrigerant and insulation blowing gas used in the appliance
require special disposal procedures. Consult a service agent or a
similarly qualified person before disposing of them.
• When the power cord is to be replaced, the replacement work shall
be performed by authorized personnel using only genuine
replacement parts.
• If the supply cord is damaged, it must be replaced by the
manufacturer or its service agents or similarly qualified person in
order to avoid a hazard.
• The appliance shall be installed in accordance with national wiring
regulations.
• This appliance must be properly grounded.
• Do not cut or remove the grounding prong from the power plug.
• Attaching the earth wire to the power outlet cover screw does not
ground the appliance unless the cover screw is metal, uninsulated,
and the power outlet is grounded through house wiring.
• If you have any doubt whether the air conditioner is properly
grounded, have the power outlet and circuit checked by a qualified
electrician.
Installation
• Contact an authorized service centre when installing or relocating the
air conditioner.
• Contact the dealer, seller, qualified electrician or authorized service
centre for cleaning or maintenance the air conditioner.

7
SAFETY INSTRUCTIONS
ENGLISH
• Do not install, remove, or re-install the unit by yourself (customer).
Installation or reparis done by unauthorized persons can pose
hazards to you and others.
• For electrical work, contact the dealer, seller, qualified electrician or
authorized service centre.
• Do not attempt to do electrical work or grounding work unless you
are licensed to do so. Consult with the dealer for electrical work and
grounding work.
• Do not install the product on a defective installation stand.
• Be sure the installation area does not deteriorate with age.
• Be sure to only use accessories made by LG which are specifically
designed for use with the equipment and have them installed by a
professional.
• Never install the outdoor unit on a moving base or a place from
where it can fall down.
• Do not install the unit in potentially explosive atmospheres.
• Do not install the air conditioner in a place where flammable liquids
or gases such as gasoline, propane, paint thinner, etc., are stored.
• Install the panel and the cover of the control box safely.
• Install dedicated electric outlet and earth leakage breaker before
using the appliance.
• Use standard circuit breaker and fuse that conform to the rating of
the air conditioner.
• Do not use a multiple socket, extension power cable or adapter with
this appliance.
• The indoor/outdoor wiring connections must be secured tightly, and
the cable should be routed properly so that there is no force pulling
the cable from the connection terminals. Improper or loose
connections can generate heat or cause a fire.
• Do not connect the ground wire to a gas pipe, a lightning rod, or a
telephone ground wire.
• Use non-flammable gas (nitrogen) to check for leaks and to purge air;
using compressed air or flammable gas may cause fire or explosion.

8
SAFETY INSTRUCTIONS
Operation
• Do not modify or extend the power cable. Scratches or peeling
insulation on the power cables may result in fire or electric shock, and
should be replaced.
• Make sure that the power cable is neither dirty, loose, nor broken.
• Do not place any objects on the power cable.
• Take care to ensure that the power cable could not be pulled out or
damaged during operation.
• Never touch, operate, or repair the air conditioner with wet hands.
• Do not insert hands or other objects through the air inlet or outlet
while the air conditioner is operating.
• Make sure that nobody especially children do not climb on or hit the
outdoor unit.
• Be sure to use only those parts listed in the service parts list. Never
attempt to modify the equipment.
• Do not touch the refrigerant pipe, water pipe or any internal parts
while the unit is operating or immediately after operation.
• Do not leave flammable substances such as gasoline, benzene, or
thinner near the air conditioner.
• Do not use the air conditioner for an extended period of time in a
small place without proper ventilation.
• Be sure to ventilate sufficiently when the air conditioner and a
heating appliance such as a heater are used simultaneously.
- There is the possibility of oxygen deficiency.
• Do not block the inlet or outlet of airflow.
• Cut off the power supply if there is any noise, smell, or smoke coming
from the air conditioner.
• Contact an authorized service centre when the air conditioner is
submerged by flood waters.
• In the event of a gas leak (such as Freon, propane gas, LP gas, etc.)
ventilate sufficiently before using the air conditioner again.

9
SAFETY INSTRUCTIONS
ENGLISH
• Stop operation and close the window in storm or hurricane. If
possible, remove the product from the window before the hurricane
arrives.
Wireless Remote Control
• Never mix different types of batteries, or old and new batteries for
the remote control.
• Do not recharge or disassemble the batteries.
• Dispose of the batteries in a place where there is no danger of fire.
• Stop using the remote control if there is a fluid leak in the battery. If
your clothes or skin is exposed to the leaking battery fluid, wash off
with clean water.
• If the leaking battery fluid has been swallowed, rinse the inside of the
mouth thoroughly and consult a doctor.
• Never let the indoor unit or the remote control get wet.
Maintenance
• Before cleaning or performing maintenance, disconnect the power
supply and wait until the fan stops.
- The fan rotates at a very high speed during operation.
- There is a possibility of injury if the unit’s power is accidentally
triggered on while cleaning inner parts of the unit.
• Appliance shall be disconnected from its power source during service
and replacing parts.
Refrigerant
General
• Follow the standards of the corresponding region or country for
handling the refrigerant and the air conditioner and for
disassembling the air conditioner.
• Use only the refrigerant specified on the air conditioner label.

10
SAFETY INSTRUCTIONS
• Do not input air or gas into the system except the specified
refrigerant.
• Do not touch the leaking refrigerant during installation or repair.
• If the refrigerant gas leaks during the installation, ventilate the area
immediately.
• Be sure to check for refrigerant leaks after installing or repairing the
product.
• In the case of refrigerant leakage, consult the dealer. When the air
conditioner is to be installed in a small room, it is necessary to take
proper measures so that the amount of any leaked refrigerant does
not exceed the limiting concentration even when it leaks. If the
refrigerant leaks exceeding the level of limiting concentration, an
oxygen deficiency accident may happen.
R32 Only
• The appliance shall be stored in a well-ventilated area where the
room size corresponds to the room area as specified for operation.
• Ducts connected to an appliance shall not contain an ignition source.
• Any person who is involved with working on or breaking into a
refrigerant circuit should hold a current valid certificate from an
industry-accredited assessment authority, which authorises their
competence to handle refrigerants safely in accordance with an
industry recognised assessment specification.
• Servicing shall only be performed as recommended by the
equipment manufacturer. Maintenance and repair requiring the
assistance of other skilled personnel shall be carried out under the
supervision of the person competent in the use of flammable
refrigerants.
• Keep any required ventilation openings clear of obstruction.

11
SAFETY INSTRUCTIONS
ENGLISH
• The appliance shall be stored in a room without continuously
operating open flames (for example an operating gas appliance) and
ignition sources (for example an operating electric heater).
• The appliance shall be stored so as to prevent mechanical damage
from occurring.
CAUTION INSTRUCTIONS
CAUTION
• To reduce the risk of minor injury to persons, malfunction, or damage
to the product or property when using this product, follow basic
precautions, including the following:
Installation
• Transport the air conditioner with two or more people or use a
forklift.
• Do not install the air conditioner in an area where it is directly
exposed to sea wind (salt spray).
• Install the drain hose properly for the smooth drainage of water
condensation.
• Install the air conditioner in a place where the noise from the outdoor
unit or the exhaust fumes will not inconvenience the neighbours.
• Safely dispose of packing materials such as screws, nails, plastic bags
or batteries using proper packaging after installation or repair.
• Exercise caution when unpacking or installing the air conditioner.
• Be especially careful of the case edges and the fins on the condenser
and evaporator.
• To avoid vibration or water leakage, keep level even when installing
the product. To avoid vibration or water leakage.
• When installing the unit, use the installation kit provided with the
product.
• The heat exchanger fins are sharp edges enough to cut. To avoid
injury, wear gloves or cover the fins while working around them.

12
SAFETY INSTRUCTIONS
Operation
• Do not drink the water drained from the air conditioner.
• Do not place objects in direct proximity of the outdoor unit and do not
let leaves and other debris accumulate around the unit. Leaves are a
hotbed for small animals which can enter the unit. Once inside the
unit, such animals can cause malfunctions, smoke or fire if they come
into contact with electrical parts.
• Do not let the air conditioner run for a long time when humidity is
very high or when a door or a window has been left open.
• Do not expose people, animals, or plants to the cold or hot wind from
the air conditioner for extended periods of time.
• Do not use the product for special purposes, such as preserving
foods, works of art, etc. the air conditioner is designed for consumer
purposes, and is not a precision refrigeration system. There is risk of
damage or loss of property.
• Do not turn on the breaker or power under condition that front panel,
cabinet, top cover, control box cover are removed or opened.
• Do not open the front grille of the product during operation. Do not
touch the electrostatic filter, if the unit is so equipped.
• Be cautious that water could not enter the product.
• Make sure that there are no obstacles close to the outdoor unit. The
presence of obstacles close to the outdoor unit may reduce the
performance of outdoor unit or increase its operating sound.
• Do not turn off the power immediately after stopping operation.
Always wait for at least five minutes before turning off the power.
Maintenance
• Use a sturdy stool or ladder when cleaning, maintaining, or repairing
the air conditioner at a height.
• Do not plug or unplug the power supply plug to turn the unit on or
off.
• Never use strong cleaning agents or solvents or spray water when
cleaning the air conditioner. Use a soft cloth.

13
SAFETY INSTRUCTIONS
ENGLISH
• Never touch the metal parts of the air conditioner when removing the
air filter.
• Tear apart and throw away plastic packaging bags so that children
will not play with them.
• When the product is not to be used for a long time, disconnect the
power supply plug or turn off the breaker.
• Do not tilt the unit when removing or uninstalling it. The condensed
water inside can spill.
• Check the foundation for damaged on a continuous basis, especially
if it has been in use for a long time.
• Always insert the filter securely. Clean the filter every two weeks or
more often if necessary. A dirty filter reduces the efficiency of the air
conditioner and could cause product malfunction or damage.

14
OPERATION
OPERATION
Before Use
Notes for Operation
• Adjust the direction of the airflow vertically to circulate indoor air.
• Speed up the fan to cool or warm indoor air quickly, within a short period of time.
• Turn off the appliance and periodically open windows for ventilation. The indoor air quality may
deteriorate if the appliance is used for long periods.
• Clean the air filter once every 2 weeks. Dust and impurities collected in the air filter may block the airflow
or reduce the appliance performance.
Suggestions for Energy Saving
• Do not over-cool the space. This may be harmful to your health and may consume more electricity.
• Block sunlight with blinds or curtains while you are operating the appliance.
• Keep doors or windows closed tightly while you are operating the appliance.

15
OPERATION
ENGLISH
Product Overview
4 Way Cassette
a Operating Status Lamp and Remote Control Receiver
Displays the operating status and contains the receiver for the wireless remote.
b Forced Operation Button
Operates the product when the remote control can't be used.
c Air Intake/Air Filter
• Air Intake: Takes in air from the room.
• Air Filter: Reduces dust in the air.
d Air Outlet
Circulates air back into the room at the desired temperature.

16
OPERATION
Display
a Operating Status Lamp
*1 The Clean Filter indicator lamp does not light
up starting from the corresponding product
manufacturing number (After Oct. 2021).
b Forced Operation Button
Operates the appliance when the remote
control can't be used.
• Press the
b button for about 2 seconds.
Auto Restart Function
When the appliance is turned on again after a
power failure, it restores the previous operation
settings and run in the same.
• This function is useful in the case of power
failure.
• This function is enabled by the factory default
settings.
• If you want to set or disable the auto restart
function, press and hold the Forced Operation
Button
b for 15 seconds.
Color Description
Green
1) Cooling or Heating mode
2) Hot start or defrost mode
before starting heating
mode
Yellowish
Green
1) Time to clean the filter in
cooling or heating mode
*1
2) when reservations sets
are set.
Orange Time to clean filter when the
product is not operating.

17
OPERATION
ENGLISH
Using the Appliance with
Remote Control
Follow these steps to see a detailed guide for using
the product with the remote control.
1 Click the below website address.
• www.lg.com
2 Insert the model name in the search box.
• The model name is on the remote control or
printed on the box in which the remote
control is packed.
3 Search the manual that you want to see.
NOTE
• Some models do not have a manual on the
website. For those models, refer to the manual
included with the remote control.

18
SMART FUNCTIONS
SMART FUNCTIONS
LG ThinQ Application
The LG ThinQ application allows you to
communicate with the appliance using a
smartphone.
LG ThinQ Application Features
Communicate with the appliance from a
smartphone using the convenient smart features.
•
Smart Diagnosis
- If you experience a problem while using the
appliance, this smart diagnosis feature will
help you diagnose the problem.
• Settings
- Allows you to set various options on the
appliance and in the application.
NOTE
• If you change your wireless router, internet
service provider, or password, delete the
registered appliance from the
LG ThinQ
application and register it again.
• The application is subject to change for
appliance improvement purposes without notice
to users.
• Functions may vary by model.
Before Using LG ThinQ
Application
1 Check the distance between the appliance and
the wireless router (Wi-Fi network).
• If the distance between the appliance and
the wireless router is too far, the signal
becomes weak. It may take a long time to
register or fail to install the application.
2 Turn off the Mobile data or Cellular Data on
your smartphone.
3 Connect your smartphone to the wireless
router.
NOTE
• To verify the Wi-Fi connection, check that f icon
on the control panel is lit.
• The appliance supports 2.4 GHz Wi-Fi networks
only. To check your network frequency, contact
your Internet service provider or refer to your
wireless router manual.
•
LG ThinQ is not responsible for any network
connection problems or any faults,
malfunctions, or errors caused by network
connection.
• If the appliance is having trouble connecting to
the Wi-Fi network, it may be too far from the
router. Purchase a Wi-Fi repeater (range
extender) to improve the Wi-Fi signal strength.
• The Wi-Fi connection may not connect or may be
interrupted because of the home network
environment.
• The network connection may not work properly
depending on the Internet service provider.

19
SMART FUNCTIONS
ENGLISH
• The surrounding wireless environment can
make the wireless network service run slowly.
• If the appliance cannot be connected due to
problems with the wireless signal transmission,
unplug the appliance and wait about a minute
before trying again.
• If the firewall on your wireless router is enabled,
disable the firewall or add an exception to it.
• The wireless network name (SSID) should be a
combination of English letters and numbers. (Do
not use special characters.)
• Smartphone user interface (UI) may vary
depending on the mobile operating system (OS)
and the manufacturer.
• If the security protocol of the router is set to
WEP , you may fail to set up the network. Please
change it to other security protocols (
WPA2 is
recommended) and register the product again.
Installing LG ThinQ Application
Search for the LG ThinQ application from the
Google Play Store or Apple App Store on a
smartphone. Follow instructions to download and
install the application.
Open Source Software Notice
Information
To obtain the source code that is contained in this
product, under GPL, LGPL, MPL, and other open
source licenses that have the obligation to disclose
source code, and to access all referred license
terms, copyright notices and other relevant
documents, please visit https://
opensource.lge.com.
LG Electronics will also provide open source code to
you on CD-ROM for a charge covering the cost of
performing such distribution (such as the cost of
media, shipping, and handling) upon email request
to [e-mail].
This offer is valid to anyone in receipt of this
information for a period of three years after our
last shipment of this product.
Radio Equipment Specifications
Model LCW-007
Frequency
Range
2412 MHz - 2472 MHz
Output
Power(Max)
17.59 dBm

20
MAINTENANCE
MAINTENANCE
Cleaning
Cleaning Interval
*1 This filter is provided only when the air purifying
front panel is installed.
NOTE
• Never use water that is hotter than 40 ℃when
you clean the filters. Doing so may cause
deformation or discolouration.
• Never use volatile substances when you clean
the filters. Doing so may damage the surface of
the appliance.
• Cleaning interval is set period assuming that 8
hours of daily use.
• If the filter is clogged with dust, the cooling/
heating efficiency will drop.
- 6 % of the electricity will be wasted.
Filter Type Water
Washing
Interval
a Air Filter
O2Weeks
b PM1.0 Filter
*1
O 6 Months
c Deodorization
Filter
*1
X 6 Months
Filter Type Water
Washing
Interval