LG H12TN4 User manual

www.lg.com
AIR CONDITIONER
Copyright © 2023 LG Electronics Inc. All Rights Reserved
TYPE: WALL MOUNTED
MOT Registration No. : IMKG.241.02.2023
Read this owner's manual thoroughly before operating the
appliance and keep it handy for reference at all times.
OWNER’S MANUAL
EN ENGLISH ID BAHASA INDONESIA
H12TN4
H18TN4

TABLE OF CONTENTS This manual may contain images or content
different from the model you purchased.
This manual is subject to revision by the
manufacturer.
SAFETY INSTRUCTIONS .............................................................. 3
IMPORTANT SAFETY INSTRUCTIONS ..........................................................4
NAMES OF PARTS....................................................................... 11
Indoor Unit....................................................................................................... 11
Outdoor Unit.................................................................................................... 11
INDOOR UNIT DISPLAY...............................................................12
EMERGENCY FUNCTION............................................................13
Emergency Function .......................................................................................13
REMOTE CONTROLLER .............................................................14
Using Wireless Remote Control......................................................................14
Replacement of Batteries................................................................................15
OPERATING INSTRUCTIONS .....................................................16
Cooling Mode..................................................................................................16
Auto Mode (auto changeover / auto operation mode).....................................16
Dry Mode.........................................................................................................17
Heating Mode .................................................................................................17
Fan Mode........................................................................................................18
Fan Speed ......................................................................................................18
Light Off...........................................................................................................19
Jet Mode .........................................................................................................19
Swing Control..................................................................................................20
Energy Saving.................................................................................................21
Dual Sensing...................................................................................................22
Room Temp.....................................................................................................22
Change Celsius to Fahrenheit °C~°F..............................................................22
Setting the Current Time .................................................................................22
Setting the On/Off Timer .................................................................................23
Using the Sleep Function................................................................................24
Using Special Function ...................................................................................24
PROTECTION...............................................................................25
AUTO-RESTART FUNCTION.......................................................25
Auto-Restart Function .....................................................................................25
MAINTENANCE............................................................................26
Air Filters.........................................................................................................26
Cleaning the Heat Exchanger .........................................................................26
End of Season Maintenance...........................................................................26
TROUBLESHOOTING..................................................................27
SPECIFICATION ...........................................................................29

3
EN
SAFETY INSTRUCTIONS
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.
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.
The following symbols are displayed on indoor and outdoor units.
This symbol indicates that this appliance uses a flammable
refrigerant. If the refrigerant is leaked and exposure to an
external ignition source, there is a risk of fire.
This symbol indicates that the Operation Manual should be
read carefully.
This symbol indicates that a service personnel should be
handling this equipment with reference to the Installation
Manual.
This symbol indicates that information is available such as the
Operating Manual or Installation Manual.

4
EN
IMPORTANT SAFETY 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:
Children in the Household
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.
Installation
• Do not install the air conditioner on an unstable surface or in a place
where there is danger of it falling.
• Contact an authorized service center when installing or relocating the
air conditioner.
• Install the panel and the cover of the control box safely.
• Do not install the air conditioner in a place where flammable liquids or
gases such as gasoline, propane, paint thinner, etc., are stored.
• Make sure that the pipe and the power cable connecting the indoor
and outdoor units are not pulled too tight when installing the air
conditioner.
• Use standard circuit breaker and fuse that conform to the rating of the
air conditioner.
• Do not input air or gas into the system except with the specific
refrigerant.

5
EN
• Use non-flammable gas (nitrogen) to check for leak and to purge air;
using compressed air or flammable gas may cause fire or explosion.
• 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 cause heat generation or fire.
• Install dedicated electric outlet and circuit breaker before using the air
conditioner.
• Do not connect the ground wire to a gas pipe, a lightning rod, or a
telephone ground wire.
• Keep any required ventilation openings clear of obstruction.
• Means for disconnection must be incorporated in the fixed wiring in
accordance with the wiring rules.
• Do not install the unit in potentially explosive atmospheres.
Operation
• Be sure to use only those parts listed in the service parts list. Never
attempt to modify the equipment.
• Make sure that children do not climb on or hit the outdoor unit.
• Dispose of the batteries in a place where there is no danger of fire.
• Use only the refrigerant specified on the air conditioner label.
• Cut off the power supply if there is any noise, smell, or smoke coming
from the air conditioner.
• Do not leave flammable substances such as gasoline, benzene, or
thinner near the air conditioner.
• Contact an authorized service center when the air conditioner is
submerged by flood waters.
• Do not use the air conditioner for an extended period of time in a
small place without proper ventilation.

6
EN
• In the event of a gas leak (such as Freon, propane gas, LP gas, etc.)
ventilate sufficiently before using the air conditioner again.
• Be sure to ventilate sufficiently when the air conditioner and a heating
appliance such as a heater are used simultaneously.
• Do not block the inlet or outlet of air flow.
• Do not insert hands or other objects through the air inlet or outlet
while the air conditioner is operating.
• Make sure that the power cable is neither dirty, loose, nor broken.
• Never touch, operate, or repair the air conditioner with wet hands.
• Do not place any objects on the power cable.
• Do not place a heater or other heating appliances near the power
cable.
• 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.
• Cut off the power supply immediately in the event of a blackout or a
thunderstorm.
• Take care to ensure that power cable could not be pulled out or
damaged during operation.
• Do not touch refrigerant pipe, water pipe and any internal parts while
the unit is operating or immediately after operation.
Maintenance
• Do not clean the appliance by spraying water directly onto the
product.
• Before cleaning or performing maintenance, disconnect the power
supply and wait until the fan stops.

7
EN
Technical Safety
• Installation or repairs made by unauthorized persons can pose
hazards to you and others.
• 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 authorizes their
competence to handle refrigerants safely in accordance with an
industry recognized 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.
• 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 appliance shall be installed in accordance with national wiring
regulations.
• When the power cord is to be replaced, the replacement work
shall be performed by authorized personnel using only genuine
replacement parts.
• This appliance must be properly grounded to minimize risk of electric
shock.
• 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.

8
EN
• If you have any doubt whether the air conditioner is properly
grounded, have the power outlet and circuit checked by a qualified
electrician.
• 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.
• If the supply cord is damaged, it must be replaced by the
manufacturer, its service agent or similarly qualified person in order to
avoid a hazard.
• The appliance shall be stored in a well-ventilated area where the
room size corresponds to the room area as specified for operation.
• 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
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
• 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.
• Exercise caution when unpacking or installing the air conditioner.

9
EN
• Do not touch the leaking refrigerant during installation or repair.
• Transport the air conditioner with two or more people or use a forklift.
• Install the outdoor unit such that it is protected from direct sunlight.
Do not place the indoor unit in a place where it is directly exposed to
sunlight via the windows.
• Safely dispose of packing materials such as screws, nails, plastic bag
or batteries using proper packaging after installation or repair.
• Install the air conditioner in a place where the noise from the outdoor
unit or the exhaust fumes will not inconvenience the neighbors.
Failure to do so may result in conflict with the neighbors.
Operation
• Remove the batteries if the remote control is not to be used for an
extended period of time.
• Make sure that the filter is installed before operating the air
conditioner.
• Be sure to check if there is a refrigerant leak after installing or
repairing the air conditioner.
• Do not place any object on the air conditioner.
• Never mix different types of batteries, or old and new batteries for the
remote control.
• 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.
• Stop using the remote control if there is a fluid leak in the battery. If
your clothes or skin are exposed to the leaking battery fluid, wash off
with clean water.
• Do not expose people, animals, or plants to the cold or hot wind from
the air conditioner for extended periods of time.

10
EN
• If the leaking battery fluid has been swallowed, rinse the inside of the
mouth thoroughly and consult a doctor.
• Do not drink the water drained from the air conditioner.
• Do not use the product for special purposes, such as preserving
foods, works of art, and etc. It is an air conditioner for consumer
purposes, not a precision refrigeration system. There is risk of
damage or loss of property.
• Do not recharge or disassemble the batteries.
• 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.
Maintenance
• Never touch the metal parts of the air conditioner when removing the
air filter.
• Use a sturdy stool or ladder when cleaning, maintaining, or repairing
the air conditioner at a height.
• Never use strong cleaning agents or solvents when cleaning the air
conditioner or spray water. Use a smooth cloth.
• To clean the interior, contact an authorized service center or dealer.
Using harsh detergents may cause corrosion or damage to the unit.

11
EN
NAMES OF PARTS
Indoor Unit Outdoor Unit
f
g
h
cbaed
k
j
l
Temp.
i
m
n
o
p
q
aa Front panelFront panel mm Air outlet grilleAir outlet grille
bb Air filterAir filter nn Outdoor unit rating labelOutdoor unit rating label
cc Optional filter (if installed)Optional filter (if installed) oo Terminal block coverTerminal block cover
dd LED DisplayLED Display pp Gas valveGas valve
ee Signal receiverSignal receiver qq Liquid valveLiquid valve
ff Terminal block coverTerminal block cover
gg Ionizer generator (if installed)Ionizer generator (if installed)
hh DeflectorsDeflectors
ii Emergency buttonEmergency button
jj Indoor unit rating labelIndoor unit rating label
kk Airflow direction louverAirflow direction louver
ll Remote controllerRemote controller
NOTE
• The above figures are only intended to be a simple diagram of the appliance and may not correspond to
the appearance of the units that have been purchased.

12
EN
INDOOR UNIT DISPLAY
Display
No. LED Function
a
Temperature display (if present)/Error code.
b
Lights up during Timer operation.
c
SLEEP mode.
NOTE
• The shape and position of switches and indicators may be different according to the model, but their
function is the same.

13
EN
EMERGENCY FUNCTION
Emergency Function
If the remote controller fails to work or
maintenance necessary, proceed as follows:
Open and lift the front panel up to an angleto reach
the emergency button.
1 One press of the emergency button (one
beep) will lead to the forced COOLING
operation.
2 Two press of the emergency button within 3
seconds (two beeps) will lead to the forced
HEATING operation.
3 To switch off the unit, you just need to press
the button again (a single long beep).
4 In forced operation, the air conditioner will
automatically start working in 23 °C cooling/
Heating mode, auto fan speed.
aa Front panelFront panel
bb Emergency buttonEmergency button
WARNING
• The shape and position of the emergency
button may be different according to the model,
but their function is the same.
NOTE
• The external static pressure of heat pumps is 0
Pa for all models.
• The emergency button in some models could
be on the right part of the unit under the front
panel.

14
EN
REMOTE CONTROLLER
Using Wireless Remote Control
You can operate the air conditioner more conveniently with the remote control.
SET UP
Mode
Sleep
Timer
SwingSwing
℃ݘ℉(5 s)
Energy
Saving
Temp.
Dual
Sensing
Light
Off
Fan
Speed
Jet
Mode
Room
Temp.
Func.
Set
Cancel
Reset
aButton bDisplay
Screen Description
Dual
Sensing
To set or cancel dual sensing mode operation.
- To turn On/Off the air conditioner.
Light Off -
To turn On/Off the air conditioner indoor
display.
Mode
To select the cooling mode.
To select the auto changeover/auto operation
mode.
To select the dry mode.
To select the heating mode.
To select the fan mode.
Fan
Speed
To adjust the fan speed.
Energy
Saving To minimize power consumption.
Jet Mode To change room temperature quickly.
To adjust the desired room temperature in
cooling, heating or auto mode. (16 °C ~ 31 °C)
Swing To adjust the air flow direction vertically.
Swing
To adjust the air flow direction horizontally.
(Optional)
Room
Temp.
To display the room temperature.
Sleep To set the sleeping mode automatically.
Func.
The Ion generator uses millions of ions to help
improve indoor air quality. (Optional)
To remove moisture generated inside the
indoor unit.
Timer
To turn on/off air conditioner automatically at
desired time.
Set/
Cancel -
To set/cancel the special functions and timer.
-
To adjust time.
°C↔°F
(5 s)
To change unit between °C and °F

15
EN
Replacement of Batteries
When : There is no confirmation beep heard from
the indoor unit. The LCD doesn’t act.
Remove the battery cover plate from the rear of
the remote controller, by sliding it in the direction
of the arrow.
Install the batteries according the direction (+ and
-) shown on the Remote Controller.
Reinstall the battery cover by sliding it into place.
WARNING
• Use 2 LR03 AAA (1.5V) batteries. Do not
use rechargeable batteries. Replace the old
batteries with new ones of the same type when
the display is no longer legible.
• Do not dispose batteries as unsorted municipal
waste. Collection of such waste separately for
special treatment is necessary.
NOTE
• Please remove batteries to avoid leakage
damage when not using for a long time.
NOTE
• Direct the remote controller toward the air
conditioner.
• Check that there are no objects between the
remote control and the signal receptor in the
indoor unit.
• Never leave the remote controller exposed to
the rays of the sun.
• Keep the remote controller at a distance of at
least 1m from the television or other electrical
appliances.
a
Temp.
aa Signal receptorSignal receptor

16
EN
OPERATING INSTRUCTIONS
Cooling Mode
The cooling function allows the air conditioner to
cool the room and at the same time reduces air
humidity.
To activate the Cooling mode of operation, press
the Mode button on the remote controller until the
symbol wappears on the display.
The cooling function is activated by setting the
button aor bat a temperature lower than that of
the room.
To optimize the function of the air conditioner,
adjust the temperature a, the speed band the
direction of the air flow cby pressing the buttons
indicated.
SET UP
Mode
Sleep
Timer
SwingSwing
℃ݘ℉(5 s)
Energy
Saving
Temp.
Dual
Sensing
Light
Off
Fan
Speed
Jet
Mode
Room
Temp
Func.
Set
Cancel
Auto Mode (auto
changeover / auto
operation mode)
In Auto mode, the air conditioner will run
automatically according to the room temperature.
To activate the Auto mode of operation, press the
Mode button on the remote controller until the
symbol Nappears on the display.
To optimize the function of the air conditioner,
adjust the temperature a, the speed band the
direction of the air flow cby pressing the buttons
indicated.
SET UP
Mode
Sleep
Timer
SwingSwing
℃ݘ℉(5 s)
Energy
Saving
Temp.
Dual
Sensing
Light
Off
Fan
Speed
Jet
Mode
Room
Temp
Func.
Set
Cancel

17
EN
Dry Mode
This function reduces the humidity of the air to
make the room more comfortable.
To activate the Dry mode of operation, press the
Mode button on the remote controller until the
symbol qappears in the display.
An automatic function of alternating cooling cycles
and air fan is activated.
SET UP
Mode
Sleep
Timer
SwingSwing
℃ݘ℉(5 s)
Energy
Saving
Temp.
Dual
Sensing
Light
Off
Fan
Speed
Jet
Mode
Room
Temp
Func.
Set
Cancel
Heating Mode
The heating function allows the air conditioner to
heat the room.
To activate the Cooling mode of operation, press
the Mode button on the remote controller until the
symbol vappears on the display.
With the button aor bset a temperature higher
than that of the room.
To optimize the function of the air conditioner,
adjust the temperature a, the speed band the
direction of the air flow cby pressing the buttons
indicated.
SET UP
Mode
Sleep
Timer
SwingSwing
℃ݘ℉(5 s)
Energy
Saving
Temp.
Dual
Sensing
Light
Off
Fan
Speed
Jet
Mode
Room
Temp
Func.
Set
Cancel

18
EN
Fan Mode
The air conditioner works in only ventilation.
To activate the Fan mode of operation, press the
Mode button on the remote controller until the
symbol Gappears in the display.
To optimize the function of the air conditioner,
Adjust the speed aand the direction of the air flow
bBy pressing the buttons indicated.
SET UP
Mode
Sleep
Timer
SwingSwing
℃ݘ℉(5 s)
Energy
Saving
Temp.
Dual
Sensing
Light
Off
Fan
Speed
Jet
Mode
Room
Temp
Func.
Set
Cancel
Fan Speed
Adjusting the Fan Speed
• Press Fan Speed button repeatedly to adjust
the fan speed.
Fan speed indicator
Display Screen Speed
→ →
Auto
Jet
High
Mid-high
Mid
Low-mid
Low
Super Low
SET UP
Mode
Sleep
Timer
SwingSwing
℃ݘ℉(5 s)
Energy
Saving
Temp.
Dual
Sensing
Light
Off
Fan
Speed
Jet
Mode
Room
Temp
Func.
Set
Cancel

19
EN
Light Off
Switch on/off the LED display on panel.
To turn off the panel display, press Light Off
button.
To turn on the panel display again, press Light Off
button.
If the indoor display is set to OFF, pressing a
button on the remote control automatically turns
the display on for 15 seconds.
SET UP
Mode
Sleep
Timer
SwingSwing
℃ݘ℉(5 s)
Energy
Saving
Temp.
Dual
Sensing
Light
Off
Fan
Speed
Jet
Mode
Room
Temp
Func.
Set
Cancel
Jet Mode
To activate Jet Mode function, pressing the button
Jet Mode or pressing the button Fan Speed until
appears on the display.
To cancel this function, pressing the Fan Speed to
switch other fan speed or pressing the Jet Mode
button again.
In Cooling / Auto / Heating / Fan mode, when you
select Jet Mode feature, it will use the highest fan
setting to blow strong airflow.
SET UP
Mode
Sleep
Timer
SwingSwing
℃ݘ℉(5 s)
Energy
Saving
Temp.
Dual
Sensing
Light
Off
Fan
Speed
Jet
Mode
Room
Temp
Func.
Set
Cancel

20
EN
Swing Control
Vertically Swing
Press the button to activate the “Vertically Swing”.
• If press time interval is in 2 seconds, the swing
will cycle as below:
Deactivate
• If long press the button, the swing angle range
will cycle as below:
(Optional)
Horizontally Swing
Press the button to activate the “Horizontally
Swing”.
• If press time interval is in 2 seconds, the swing
will cycle as below:
Deactivate
• If long press the button, the swing angle range
will cycle as below:
(Optional)
NOTE
• Adjusting the air flow direction horizontally may
not be supported, depending on the model.
• Adjusting the air deflector arbitrarily may cause
product failure.
• Never position manually, the delicate
mechanism might seriously damaged! (Models
without Horizontally Swing can adjust manually.)
• Never poke fingers, sticks or other objects in the
air inlet or outlet vents. Such accidental contact
might cause unforeseeable damage or hurt.
• Adjusting the swing angle change may not be
supported, depending on the model.
SET UP
Mode
Sleep
Timer
SwingSwing
℃ݘ℉(5 s)
Energy
Saving
Temp.
Dual
Sensing
Light
Off
Fan
Speed
Jet
Mode
Room
Temp
Func.
Set
Cancel