Streamline ISWK series User manual

Specification and performance data listed herein are subject to change without notice
I s a p r o d u c t o f E n v i r o n m e n t a l T e c h n o l o g i e s LLC.
ISWK Series
High Wall Inverter Split
USER’S MANUAL
ENGLISH
Read this Manual before the operation
and keep it for reference.
Read all safety precautions on the
manual, improper use can cause
serious injury.

Operation Notices
Precautions ........................................................................................................ 1
Parts name.......................................................................................................... 5
Operation Guide
Operation guide.................................................................................................. 6
Remote controller .............................................................................................. 7
Buttons on remote controller............................................................................ 8
Maintenance
Clean and maintenance................................................................................... 15
Malfunction
Malfunction analysis........................................................................................ 17
Installation Notice
Installation drawing ......................................................................................... 20
Installation prepare.......................................................................................... 21
Installation
Installation of indoor unit................................................................................ 23
Installation of outdoor unit.............................................................................. 27
Check after installation ................................................................................... 31
Test operation................................................................................................... 31
Attachment
Conguration of connection pipe................................................................... 32
Pipe expanding method................................................................................... 33
Content
This marking indicates that this product should not be disposed with other
household wastes throughout the EU. To prevent possible harm to the
environment or human health from uncontrolled waste disposal, recycle it
responsibly to promote the sustainable reuse of material resources. To return
your used device, please use the return and collection systems or contact
the retailer where the product was purchased. They can take this product for
environmental safe recycling.

1
This appliance can be used by children aged of 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.
Do not connect air conditioner to multi-purpose socket.
Otherwise, it may cause re hazard.
Do disconnect power supply when cleaning air conditioner.
Otherwise, it may cause electric shock.
If the supply cord is damaged, it must be replaced by the
manufacturer, its service agent or similarly qualied persons in
order to avoid a hazard.
Do not wash the air conditioner with water to avoid electric
shock.
Do not spray water on indoor unit. It may cause electric shock
or malfunction.
After removing the lter, do not touch ns to avoid injury.
Do not use re or hair dryer to dry the lter to avoid deformation
or re hazard.
Maintenance must be performed by qualied professionals.
Otherwise, it may cause personal injury or damage.
Do not repair air conditioner by yourself. It may cause electric
shock or damage. Please contact dealer when you need to
repair air conditioner.
Do not extend ngers or objects into air inlet or air outlet. It may
cause personal injury or damage.
Precautions
Operation and Maintenance
WARNING

2
Attachment
Installation must be performed by qualied professionals.
Otherwise, it may cause personal injury or damage.
Must follow the electric safety regulations when installing the
unit.
According to the local safety regulations, use qualied power
supply circuit and circuit break.
Do install the circuit break. If not, it may cause malfunction.
An all-pole disconnection switch having a contact separation of
at least 3mm in all poles should be connected in xed wiring.
Air Conditioner should be properly grounded. Incorrect
grounding may cause electric shock.
Do not block air outlet or air inlet. It may cause malfunction.
Do not spill water on the remote controller, otherwise the
remote controller may be broken.
When below phenomenon occurs, please turn off air conditioner
and disconnect power immediately, and then contact the dealer
or qualied professionals for service.
● Power cord is overheating or damaged.
● There’s abnormal sound during operation.
● Circuit break trips off frequently.
● Air conditioner gives off burning smell.
● Indoor unit is leaking.
If the air conditioner operates under abnormal conditions, it
may cause malfunction, electric shock or re hazard.
When turning on or turning off the unit by emergency operation
switch, please press this switch with an insulating object other
than metal.
Do not step on top panel of outdoor unit, or put heavy objects.
It may cause damage or personal injury.
Precautions WARNING

3
Including an circuit break with suitable capacity, please note the
following table.Air switch should be included magnet buckle
and heating buckle function, it can protect the circuit-short and
overload.
Don't use unqualied power cord.
Make sure the power supply matches with the requirement of
air conditioner.Unstable power supply or incorrect wiring or
malfunction. Please install proper power supply cables before
using the air conditioner.
Properly connect the live wire, neutral wire and grounding wire
of power socket.
Be sure to cut off the power supply before proceeding any work
related to electricity and safety.
Do not put through the power before nishing installation.
If the supply cord is damaged, it must be replaced by the
manufacturer, its service agent or similarly qualied persons in
order to avoid a hazard.
The temperature of refrigerant circuit will be high, please keep
the interconnection cable away from the copper tube.
The appliance shall be installed in accordance with national
wiring regulations.
Installation must be performed in accordance with the
requirement of NEC and CEC by authorized personnel only.
The air conditioner is the rst class electric appliance. It must
be properly grounding with specialized grounding device
by a professional. Please make sure it is always grounded
effectively, otherwise it may cause electric shock.
The yellow-green wire in air conditioner is grounding wire,
which can't be used for other purposes.
The grounding resistance should comply with national electric
safety regulations.
Precautions WARNING

4
Working temperature range
The operating temperature range (outdoor temperature) for cooling only unit is 18°C~ 48°C,
for heat pump unit is -7°C~ 24°C.
Indoor side DB/WB(°C) Outdoor side DB/WB(°C)
Maximum cooling 32/23 43/26
Maximum heating 27/- 24/18
The appliance must be positioned so that the plug is accessible.
All wires of indoor unit and outdoor unit should be connected
by a professional.
If the length of power connection wire is insufcient, please
contact the supplier for a new one. Avoid extending the wire by
yourself.
For the air conditioner with plug, the plug should be reachable
after nishing installation.
For the air conditioner without plug, an circuit break must be
installed in the line.
If you need to relocate the air conditioner to another place, only
the qualied person can perform the work. Otherwise, it may
cause personal injury or damage.
Select a location which is out of reach for children and far away
from animals or plants.If it is unavoidable, please add the fence
for safety purpose.
The indoor unit should be installed close to the wall.
Precautions WARNING

5
Parts name
Panel
Horizontal louver Aux.button
Air inlet
Filter Air outlet
TIMERTIMER
ON
LIGHTECO
QUIET
CLOCK
I FEEL
OFF
HEALTH
CLEANTEMP
MODE FAN
TURBO SLEEP
Remote controller Air inlet
Handle
Air outlet
Indoor unit
Outdoor unit
Actual product may be different from above graphics,please refer to actual products.
NOTE:
Display
Temp.indicator
Power indicator

6
1. Press the back side of remote controller marked with " ", as shown in the g, and then
push out the cover of battery box along the arrow direction.
2. Installation two 7# (AAA 1.5V) dry batteries, and make sure the position of "+" polar and "-"
polar are correct.
3. Reinstall the cover of battery box.
Installation batteries
Operation guide
1. After connecting the power, press " " button on remote controller to turn on the air
conditioner.
2. Press "MODE" button to select your required mode: Auto, Cool, Dry, Fan, Heat.
3. Press " + " or " - " button to set your required temperature. (Temperature can’t be adjusted
under auto mode).
4. Press "FAN" button to set your required fan speed: auto, fan1, fan2 , fan3 , fan4, fan5,
stepless speed.
5. Press " " or " " button to select fan blowing angle.
● During operation, point the remote control signal sender at the receiving window on indoor unit.
● The distance between signal sender and receiving window should be no more than 8m, and there
should be no obstacles between them.
● Signal may be interfered easily in the room where there is uorescent lamp or wireless telephone;
remote controller should be close to indoor unit during operation.
● Replace new batteries of the same model when replacement is required.
● When you don’t use remote controller for a long time, please take out the batteries.
● If the display on remote controller is fuzzy or there’s no display, please replace batteries.
NOTE:
Operation guide

7
TIMERTIMER
ON
LIGHTECO
QUIET
CLOCK
I FEEL
OFF
HEALTH
CLEANTEMP
MODE FAN
TURBO SLEEP
Turbo mode
Health function
Send signal
Set fan speed
Child lock
Sleep mode
Up&down swing
Light
Dual-8 nixietube
Auto mode
Cool mode
Dry mode
Fan mode
Heat mode
Clock display
Fan button
+ button
Left&right swing button
Light button
Timer off button
Timer on button
Health button
Clean button
Temp button
I feel
Left&right swing
Up&down swing button
Turbo button Sleep button
Clock button
ECO button
I feel button
Quiet button
- button
ON/OFF button
Mode button
Quiet mode
Clean mode
ECO mode
Temp. display type
Outdoor ambient temp.
Indoor ambient temp.
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Remote controller

8
ON/OFF button
Press this button can turn on or turn off the air conditioner.
After connecting the power, the air conditioner will make a sound.
Power indicator is ON. After that, you can operate the air conditioner by using remote controller.
Under on status, pressing the button on the remote controller, the signal icon " "on the display of
remote controller will blink once and the air conditioner will give out a "de" sound, which means the
signal has been sent to the air conditioner.The display will show the corresponding set function icons.
Under off status, light and clock icon will be displayed on the display of remote controller (If timer
on, timer off and light functions are set, the corresponding icons will be displayed on the display of
remote controller at the same time).
MODE button
Press this button to select your required operation mode.
●
When selecting auto mode, air conditioner will operate automatically according to ex-factory
setting. Set temperature can’t be adjusted and will not be displayed as well. Press "FAN"
button can adjust fan speed. Press " " or " " button can adjust fan blowing angle.
●After selecting cool mode, air conditioner will operate under cool mode. Press "+" or "-"
button to adjust set temperature. Press "FAN" button to adjust fan speed. Press " " or
" " button to adjust fan blowing angle.
●
When selecting dry mode, the air conditioner operates at fan1, fan speed can’t be adjusted.
Press " " or " " button to adjust fan blowing angle.
●When selecting fan mode, the air conditioner will only blow fan, no cooling and no heating.
Press "FAN" button to adjust fan speed. Press " " or " " button to adjust fan blowing
angle.
●When selecting heat mode, the air conditioner operates under heat mode. Press "+" or
"-" button to adjust set temperature. Press "FAN" button to adjust fan speed. Press " " or
" " button to adjust fan blowing angle. (Cooling only unit won’t receive heat mode signal.
If setting heat mode with remote controller, press "ON/OFF" button can’t start up the unit).
Note:
● For preventing cold air, after starting up heating mode, indoor unit will delay 1~5 minutes
to blow air (actual delay time is depend on indoor ambient temperature).
● Set temperature range from remote controller: 16~31°C;
Fan speed: auto, fan1, fan2 , fan3 , fan4, fan5, stepless speed.
Auto Cool Dry Fan Heat
Buttons on remote controller

9
fan1 fan2 fan3
fan4fan5
stepless speed
AUTO
Note:
●When selecting " " with remote controller, it’s auto swing.
up&down swing louver of air
conditioner will swing up&down automatically at the maximum angle.
● When selecting " , , , , " with remote controller, it's the xed position swing.
Up&down swing louver of air conditioner will stop at that position as shown by the icon to
swing.
FAN button
Pressing this button can set fan speed circularly as: auto (AUTO), fan1( ), fan2 ( ) ,
fan3 ( ) , fan4 ( ), fan5 ( ), stepless speed.
Note:
● In AUTO speed, air conditioner will select proper fan speed automatically according to
ambient temperature.
● Fan speed under dry mode is fan1.
● After entering the stepless speed mode, users can adjust the fan speed according to the
button "+" or "-".
button
button
●Press this button the up&down swing function can be started and canceled. The remote
controller defaults to static swing condition.
●Press "MODE" button and " " button at the same time when remote controller OFF to
switch between simple swing and static swing.
●
In static swing condition, pressing this button, the swing angle of up&down swing louver
changes as
below:
●Press this button the left&right swing function can be started and canceled. The remote
controller defaults to static swing condition.
●Press "MODE" button and " " button at the same time at remote controller OFF to
switch between simple swing and static swing.
●
In static swing condition, pressing this button, the swing angle of left&right swing louver
changes
as below:
Buttons on remote controller
No display

10
Buttons on remote controller
+ and - button
Press "+" or "-" button once to increase or decrease 1°C of set temperature. Holding "+" or
"-" button, set temperature on remote controller will change quickly. On releasing button after
setting is nished, temperature indicator on indoor unit will change accordingly. (Temperature
can’t be adjusted under auto mode)
● When setting TIMER ON, TIMER OFF or CLOCK, press "+" or "-" button to adjust time
(Refer to CLOCK, TIMER ON, TIMER OFF buttons).
TURBO button
Press this button to turn on or turn off the TURBO function in cool,heat,fan mode.
Note:
● Press "QUIET" or "FAN" button the unit will quit this function.
● This function is no use in auto mode or dry mode.
●When selecting " " with remote controller, it’s auto swing.
left&right swing louver of air
conditioner will swing
left&right automatically at the maximum angle.
●When selecting " , , , , , " with remote controller,it's the xed position
swing.
Left&right swing louver of air conditioner will stop at that position as shown by the
icon to swing.
●When selecting " ", it’s the circulating swing.
Left&right swing louver of air conditioner
will swing circularly according to the angle as shown by the icon.
Note:
There is no this function for the units. If press this button, the main unit will sound, but it also
runs under original status.
HEALTH button
Press this button to turn on or turn off the health function.
Note: This function is not available for some models.
SLEEP button
Press this button to turn on or turn off the SLEEP function under cool,heat ,dry mode.
Note:
● This function is off as defaulted after power on.
● It will be cleared after changing mode.
● It is no use under "FAN" mode and "AUTO" mode.
No display

11
Buttons on remote controller
I FEEL button
Press this button to start I FEEL function and " " will be displayed on the remote controller.
After this function is set, the remote controller will send the detected ambient temperature
to the indoor unit and the unit will automatically adjust the indoor temperature according to
the detected temperature. Press this button again to close I FEEL function and " " will
disappear.
Note:
Please put the remote controller near user and conrm the unit can receive the remote code
when this function is set. Do not put the remote controller near the object of high temperature
or low temperature in order to avoid detecting inaccurate ambient temperature.
TEMP button
By pressing this button, you can see indoor set temperature, indoor ambient temperature
or outdoor ambient temperature on indoor unit’s display. The setting on remote controller is
selected circularly as below:
● When selecting "no display" on the remote controller, the temperature indicator which on
the indoor units will display the set temperature.
● When selecting " " with remote controller, temperature indicator on indoor unit displays
indoor ambient temperature.
● When selecting " " with remote controller, temperature indicator on indoor unit displays
outdoor ambient temperature.
Note:
Outdoor temperature display is not available for some models. At that time, indoor unit
receives " " signal, it displays indoor set temperature.
● Press this button to start or cancel clean function.
● It is unable to set clean function when the unit is on; if the air conditioner runs in cool or
dry mode before turning off, press "CLEAN" button and show " " then the clean function
is on; press "CLEAN" button again, " " disappeared, then the clean function is off, or
running 10 mins in clean function then turn off automatically.
● In the rst power on, the clean function is off acquiescently.
● The clean function can not be set and displayed when the air conditioner is in auto, fan
and heat mode before turn off.
CLEAN button
No display

12
CLOCK button
Press this button to set clock time. " "and " " icon on remote controller will blink.
Press "+" or "-" button within 5s to set clock time. Each pressing of "+" or "-" button, clock
time will increase or decrease 1 hour. Press this button again, " " and " " icon
on remote controller will blink. Press "+" or "-" button within 5s to set clock time. Press this
button another time, " " and " " icon on remote controller will blink. Press "+" or
"-" button within 5s to set clock time. If hold "+" or "-" button, clock time will change quickly.
Release when reaching your required time. Press "CLOCK " button to conrm the time,
" " icon stops blinking.
Note:
● Clock time adopts 24-hour mode.
● The interval between two operation can’t exceeds 5s. Otherwise, remote controller will quit
setting status. Operation for TIMER ON/TIMER OFF is the same.
TIMER ON button
This button can set the time for timer on. After pressing this button, " " icon disappears,
"ON" and " " icon on remote controller blinks. Press "+" or "- "button within 5s to set
"TIMER ON" time. Each pressing of "+" or "-" button, the time will increase or decrease 1
hour. Press this button again, "ON" and " " icon on remote controller will blink. Press
"+" or "-" button within 5s to set the time. Press this button another time, "ON" and " "
icon on remote controller will blink. Press "+" or "-" button within 5s to set the time. Hold "+"
or "-" button, the time will change quickly until reaching your required time. Press "TIMER ON"
to conrm it. The word "ON" will stop blinking. " " icon resumes displaying.
Cancel TIMER ON
Under the condition that TIMER ON is started up, press "TIMER ON" button to cancel it.
TIMER OFF button
This button can set the time for timer off. After pressing this button, " " icon disappears,
"OFF" and " " icon on remote controller blink. Press "+" or "-" button within 5s to set
"TIMER OFF" time. Each pressing of "+" or "-" button,the time will increase or decrease
1 hour. Press this button again, "OFF" and " " icon on remote controller will blink.
Press "+" or "-" button within 5s to set the time. Press this button another time, "OFF" and
" " icon on remote controller will blink. Press "+" or "-" button within 5s to set the
time. Hold "+" or "-" button, the time will change quickly until reaching your required time.
Press "TIMER OFF" to conrm it.The word "OFF" will stop blinking. " " icon resumes
displaying.
Cancel TIMER OFF
Under the condition that TIMER OFF is started up, press "TIMER OFF" button to cancel it.
Buttons on remote controller

13
Function introduction for combination buttons
Child lock function
Press "+" and "-" simultaneously to turn on or turn off child lock function. When child lock
function is on, " " icon is displayed on remote controller. If you operate the remote
controller, the " " icon will blink three times without sending signal to the unit.
Temperature display switchover function
In the off mode, press "-" and "MODE" buttons simultaneously to switch temperature display
between °C and °F.
QUIET button
Press this button to turn on or turn off the QUIET function in cool,heat,auto mode.
Note:
● Press "TURBO" or "FAN" button the unit will quit this function.
● This function is no use in fan mode or dry mode.
ECO button
In cool mode, press "ECO" button and the unit will operate under ECO mode.
Note:
● Remote controller displays " ".
● Air conditioner will operate at auto speed. Set temperature can’t be adjusted.
● Under cool mode, sleep function can not work with ECO mode together at the same time.
● Change mode will exit the ECO mode.
LIGHT button
Press this button can turn off the light for indoor unit’s display. " " icon on remote
controller will disappear.Press this button again to turn on the light for indoor unit’s display.
" " icon on remote controller will be displayed.
In the heating mode, press "SLEEP" and "TURBO" buttons together for 3s would start or
cancel the Timing defrost.
Timing defrost
Buttons on remote controller

14
The minimum cooling temperature setting
In the off mode,pressing "TEMP"and "-" button at the same time,the LCD will display the
minimum cooling temperature.The default temperature is 16°C and you can adjust the
temperature with "+" or "-" from 16°C to 31°C, 3 seconds later it will return to the standby
mode.
In the off mode,pressing "TEMP" and "+" button at the same time,the LCD will display the
maximum heating temperature.The default temperature is 31°C and you can modulate the
temperature with "+" or "-" from 16°C to 31°C, 3 seconds later it will return to the standby
mode.
● In heating mode, pressing "Mode" and "+" button at the same time will enter/exit the low
temperature heating function.
● "LA" would be showed on the remote controller after entered into the low temperature
heating funtion.
● When switching from one mode to another mode, low temperature heating function was
canceled. Turn off and then turn on air conditioner that will remain the low temperature
heating function. After powered on, the low temperature heating mode was default to off
status.
● In the low temperature heating mode, "SLEEP" and "Low temperature heating" function
cannot start at same time.When low temperature heating mode has already started,
meanwhile you press the " SLEEP " button, the air conditioner will exit low temperature
heating
mode and enter the sleep mode. Vice versa.
Note:
1. In the low temperature heating mode, the fan speed was default to Auto and non-ajusatable.
2. In the low temperature heating mode, "TURBO" and "QUIET" can't be set. If enter the low
temperature heating mode, the turbo and quiet function that started before will be canceled.
As well as when exit the low temperature heating mode, it will not resume .
3. When exit from the low temperature heating mode, the speed and temperature will turn
into the original condition before it started.
4. You can set up other function.
The maximum heating temperature setting
Low temperature heating function setting
Buttons on remote controller

15
WARNING
■ Turn off the air conditioner and disconnect the power before cleaning the
air conditioner to avoid electric shock.
■ Do not wash the air conditioner with water to avoid electric shock.
■ Do not use volatile liquid to clean the air conditioner.
Clean surface of indoor unit
When the surface of indoor unit is dirty, it is
recommended to use a soft dry cloth or wet
cloth to wipe it.
Note:
Do not remove the panel when cleaning it.
Clean lter
Open panel
Clean lter Installation lter
Remove lter
Pull out the panel to a certain angle as
shown in the g.
Use dust catcher or water to clean the
lter. when the lter is very dirty, use
the water (below 45°C) to clean it, and
then put it in a shady and cool place to
dry.
Installtion the lter and then close the
panel cover tightly.
Remove the lter as indicated in the g.
1
3 4
2
Clean and maintenance

16
NOTE:
● The lter should be cleaned every three months. If there is much dust in the operation
environment, clean frequency can be increased.
● After removing the lter, do not touch ns to avoid injury.
● Do not use re or hair dryer to dry the lter to avoid deformation or re hazard.
Checking before use-season
1. Check whether air inlets and air outlets are blocked.
2. Check whether air switch, plug and socket are in good condition.
3. Check whether lter is clean.
4. Check whether drainage pipe is damaged.
Checking after use-season
1. Disconnect power supply.
2. Clean lter and indoor unit's panel .
Notice for recovery
1. Most of packing materials are recyclable materials.
Please dispose them in appropriate recycling unit.
2. If you want to dispose the air conditioner, please contact local dealer or consultant
service center for the correct disposal method.
Clean and maintenance

17
General phenomenon analysis
Please check below items before asking for maintenance. If the malfunction still can't be
eliminated,please contact local dealer or qualied professionals.
Phenomenon Check items Solution
Indoor unit can’t
receive remote
controller’s signal
or remote
controller has no
action.
Whether it's interfered severely
(such as static electricity, stable
voltage)?
Pull out the plug. Reinsert the plug
after about 3min, and then turn on
the unit again.
Whether remote controller is
within the signal receiving range? Signal receiving range is 8m.
Whether there are obstacles? Remove obstacles.
Whether remote controller is
pointing at the receiving window?
Select proper angle and point the
remote controller at the receiving
window on indoor unit
Is sensitivity of remote controller
low; fuzzy display and no display?
Check the batteries. If the power of
batteries is too low,please replace
them.
No display when operating
remote controller?
Check whether remote controller
appears to be damaged. If yes,
replace it.
Fluorescent lamp in room?
Take the remote controller close to
indoor unit.
Turn off the uoresent lamp and then
try it again.
No air emitted
from indoor unit.
Air inlet or air outlet of indoor unit
is blocked? Eliminate obstacles.
Under heating mode, indoor
temperature is reached to set
temperature?
After reaching to set temperature,
indoor unit will stop blowing out air.
Heating mode is turned on just
now?
In order to prevent blowing out cold
air, indoor unit will be started after
delaying for several minutes, which is
a normal phenomenon.
Air conditioner
can’t operate
Power failure? Wait until power recovery.
Is plug loose? Reinsert the plug.
Circuit break trips off or fuse is
burnt out?
Ask professional to replace circuit
break or fuse.
Wiring has malfunction? Ask professional to replace it
Unit has restarted immediately
after stopping operation?
Wait for 3min, and then turn on the
unit again.
Whether the function setting for
remote controller is correct? Reset the function.
Malfunction analysis

18
Phenomenon Check items Solution
Mist is emitted
from indoor unit’s
air outlet.
Indoor temperature and humidity
is high?
Because indoor air is cooled rapidly.
After a while, indoor temperature and
humidity will be decrease and mist
will disappear.
Set temperature
can’t be adjusted
Unit is operating under auto
mode?
Temperature can’t be adjusted under
auto mode.
Please switch the operation mode if
you need to adjust temperature.
Your required temperature
exceeds the set temperature
range?
Set temperature range:
16℃~31℃
Cooling (heating)
effect is not good.
Voltage is too low? Wait until the voltage resumes
normal.
Filter is dirty? Clean the lter.
Set temperature is in proper
range? Adjust temperature to proper range.
Door and window are open? Close door and window.
Odours are
emitted
Whether there’s odour
source,such as furniture and
cigarette, etc.
Clean the lter.
Eliminate the odour source.
Air conditioner
operates normally
suddenly
Whether there’s interference,such
as thunder, wireless devices, etc.
Disconnect power, put back
power, and then turn on the
unit again.
Outdoor
unit has
vapor
Heating mode is turned on? During defrosting under heating
mode, it may generate vapor, which
is a normal phenomenon.
" Water owing"
noise
Air conditioner is turned on or
turned off just now?
The noise is the sound of refrigerant
owing inside the unit, which is a
normal phenomenon.
Cracking noise
Air conditioner is turned on or
turned off just now?
This is the sound of friction caused by
expansion and/or contraction of panel
or other parts due to the change of
temperature.
Malfunction analysis