LG MJ18PC Owner's Manual
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LG MJ18PC Owner's Manual

LG MJ18PC Owner's Manual

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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
Wall Mounted
MFL72146104
Rev.00_061124
Copyright © 2024 LG Electronics Inc. All Rights Reserved.
www.lg.com

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  • Page 1 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 Wall Mounted www.lg.com MFL72146104 Rev.00_061124 Copyright © 2024 LG Electronics Inc. All Rights Reserved.

  • Page 2: Table Of Contents

    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 ............ 5 Safety Messages....................5 Notes for Flammable Refrigerant ..............6 WARNING INSTRUCTIONS .................
  • Page 3 Auto Clean Function (On Some Models)............33 SMART FUNCTIONS LG ThinQ Application ................35 LG ThinQ Application Features.................35 Before Using LG ThinQ Application ..............35 Installing LG ThinQ Application................36 Open Source Software Notice Information ............36 RF Radiation Exposure Statement..............36 Wireless LAN Module Specifications..............36 Diagnosis Using LG ThinQ ...............
  • Page 4 Operation ......................41 Performance .......................44 Wi-Fi ........................45 Calling for Service ..................46 Situations in which Calling for Service is Necessary ........46...

  • Page 5: Safety Instructions

    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.

  • Page 6: Notes For Flammable Refrigerant

    SAFETY INSTRUCTIONS Notes for Flammable Refrigerant The following symbols are displayed on units. 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.

  • Page 7: Installation

    SAFETY INSTRUCTIONS responsible for their safety. Children should be supervised to ensure that they do not play with the appliance. • 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.
  • Page 8 • 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.

  • Page 9: Operation

    SAFETY INSTRUCTIONS • Use non-flammable gas (nitrogen) to check for leaks and to purge air; using compressed air or flammable gas may cause fire or explosion. 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 the cables should be replaced.

  • Page 10: Wireless Remote Control

    SAFETY INSTRUCTIONS • In the event of a gas leak (such as Freon, propane gas, or LP gas), ventilate sufficiently before using the air conditioner again. • Stop operation and close the window during a storm or hurricane. If possible, remove the product from the window before the hurricane arrives.
  • Page 11 SAFETY INSTRUCTIONS • Use only the refrigerant specified on the air conditioner label. • 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.

  • Page 12: Caution Instructions

    SAFETY INSTRUCTIONS • 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.

  • Page 13: Operation

    SAFETY INSTRUCTIONS Operation • Do not drink the water drained from the air conditioner. • Do not place objects in direct proximity to 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.
  • Page 14 SAFETY INSTRUCTIONS • 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 will not be used for a long time, disconnect the power supply plug or turn off the breaker.

  • Page 15: Operation Before Use

    OPERATION OPERATION Before Use Notes for Operation • Adjust the direction of the airflow vertically or horizontally 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.

  • Page 16: Product Overview

    OPERATION Product Overview Wall-Mounted Unit Air Filter Reduces dust in the air. Air Intake Vents Takes in air from the room. Air Outlet Vents Circulates air back into the room at the desired temperature. Air Deflector (Up-Down Vane) Adjusts the airflow direction up or down. Air Deflector (Left-Right Louver) Adjusts the airflow direction left or right.

  • Page 17: Display

    OPERATION Display You can check various functions of the product in the indoor unit display. Segment Display Displays the set temperature and sub functions. Defrost Operation Displays when the defrost function is operating. Power and Auto Restart Displays when the product turns on or operates. Displays when the product sets or cancels the auto restart function.

  • Page 18: Restoring The Previous Settings

    OPERATION When the appliance beeps twice, release the NOTE Power button . The lamp will flash. This • The stepping motor may be broken, if the up- repeats 4 times. down vane opens rapidly. • The fan speed is set to high by default. •...

  • Page 19: Installing The Remote Control Holder

    OPERATION Setting the Current Time on the Reattach the cover by sliding it back into Wireless Remote Control position. Insert the batteries. • The time flashes at the bottom of the display screen. NOTE • When the wireless remote control display begins to fade, replace the AAA (1.5 V) batteries.

  • Page 20: Selecting Fahrenheit Or Celsius

    OPERATION Selecting Fahrenheit or Celsius Set the temperature display to show either Fahrenheit ( ) or Celsius ( ) units. Turn the appliance on. Press and hold the SWING (Up-Down Swing) button for about 5 seconds to change units between...

  • Page 21: Wireless Remote Control Overview

    OPERATION Wireless Remote Control Overview Wireless Remote Control Use the wireless remote control to operate the appliance more conveniently.
  • Page 22 OPERATION Buttons Image Description COMFORT AIR Adjusts the airflow to deflect wind Power Turns the appliance on/off LIGHT OFF Turns the indoor unit display on or off MODE Selects the desired operating mode • Each press changes the modes in this order: Cooling Auto Dehumidification Heating...
  • Page 23 OPERATION Image Description ROOM TEMP (Room Temperature) Displays the room temperature DIAGNOSIS [5 s] Press and hold the ROOM TEMP (Room Temperature) button for about 5 seconds to easily check the check maintenance information of an appliance. FUNC. (Function) Sets the various function or changes the temperature unit Timer Setting Adjusts the time on the display SET/CANCEL...

  • Page 24: Using Wireless Remote Control

    OPERATION Using Wireless Remote Press the MODE button repeatedly to select Control the desired mode. Operating with the Wireless Remote Control Point the wireless remote control towards the signal receiver at the right side of the appliance to operate it. Icon Description Cooling Mode...

  • Page 25: Jet Mode

    OPERATION • Dehumidification, Fan Mode: There is no Auto Mode temperature control. • You can use the FAN SPEED button during the auto mode. • You can change other operation mode manually during the auto mode. Fan Mode • When running ventilation, compressor of AHU doesn't work.

  • Page 26: Adjusting The Fan Speed

    OPERATION Press the JET MODE button. Wireless Indoor Unit Speed Remote Icon Control Icon High Medium - High • Jet Cooling Mode Medium Strong cool air blows out for 30 minutes. After 30 minutes, the temperature is Medium - Low maintained at 18 by default.

  • Page 27: Comfort Air Function (On Some Models)

    OPERATION Comfort Air Function (On Some - Select to adjust the up-down direction of the airflow automatically. Models) You can conveniently set the vane to a preset position to deflect the supply air away from blowing directly onto the occupants in the room. Turn the appliance on.
  • Page 28 OPERATION • The icon below flashes at the bottom of the • The icon below flashes at the bottom of the display screen. display screen. Press the button to set the desired Press the SET/CANCEL button to cancel the time. setting.

  • Page 29: Sleep Function (On Some Models)

    OPERATION Cancelling the Timer Setting Press the SET/CANCEL button to stop the icon from flashing. • Press the CANCEL button to cancel all timer settings. • After setting the timer, the current time and Off Timer icon are displayed on the display screen indicating that the desired time is set.

  • Page 30: Light Off Function (On Some Models)

    OPERATION • If the brightness of an indoor unit's display is set Press the SET/CANCEL button to stop the icon to off, pressing a button on the wireless remote from flashing. control automatically turns the display on for a • The Sleep function icon is displayed on the while.

  • Page 31: Checking Room Temperature

    OPERATION • This function is available with Cooling mode. • Capacity may decrease when the Energy Control function is selected. • The desired temperature is displayed for about 5 seconds if you press the FAN SPEED, button. • The room temperature is displayed for about 5 seconds if you press the ROOM TEMP (Room Temperature) button.

  • Page 32: Special Functions Overview

    OPERATION Special Functions Overview Special Functions Icon Description Silent Function Reduces noise from outdoor units Auto Clean Function Reduces moisture generated inside the indoor unit NOTE • Some functions may not be supported, depending on the model. • Some functions may operate differently from the wireless remote control display.

  • Page 33: Using Special Functions

    OPERATION Using Special Functions Press the SET/CANCEL button to cancel the function. Setting and Cancelling Special Functions Setting the Special Functions Turn the appliance on. Press the FUNC. (Function) button repeatedly Silent Function (On Some to select the desired function. Models) You can reduce the noise of the outdoor unit so that it will not inconvenience neighbours.
  • Page 34 OPERATION NOTE • Some functions cannot be used while the Auto Clean function is in operation. • If you turn off the appliance, the fan continues to run for 30 minutes to clean the inside of the indoor unit. • is displayed on some indoor units, depending on the model.

  • Page 35: Smart Functions

    Before Using LG ThinQ your Internet service provider or refer to your Application wireless router manual. • LG ThinQ is not responsible for any network connection problems or any faults, Check the distance between the appliance and malfunctions, or errors caused by network the wireless router (Wi-Fi network).

  • Page 36: Installing Lg Thinq Application

    Open Source Software Notice LG ThinQ application. Information • Launch the LG ThinQ application and select the Smart Diagnosis feature in the menu. Follow the instructions provided in the LG ThinQ To obtain the source code that is contained in this application.

  • Page 37: Maintenance Cleaning

    MAINTENANCE MAINTENANCE Cleaning Cleaning Interval WARNING • Before cleaning or performing maintenance, disconnect the power supply and wait until the fan stops. Cleaning the Appliance If the appliance will not be used for an extended period of time, dry the appliance to maintain it in the best condition.
  • Page 38 MAINTENANCE Type Description Interval Have a professional clean the heat exchanger coils and the Once a year panel vents. (Consult with technician.) Have a professional clean the fan. Once a year Outdoor unit Have a professional clean the condensate drain pan. Once a year Have a professional verify that all the fan assembly is firmly Once a year...

  • Page 39: Cleaning The Air Filter

    MAINTENANCE Cleaning the Air Filter Dry the filter in the shade. NOTE • Do not bend the air filter, as it may break. • Assemble the air filter properly to prevent dust and other substances from entering the product. Turn off the power to the appliance. Insert the tabs on the air filter into the slots on the back of the front panel.

  • Page 40: Tips For Maintenance

    MAINTENANCE Tips for Maintenance Before Long Periods of Disuse Operate the air conditioner in the Fan mode for 2 to 3 hours. • This will dry out the internal mechanisms. Turn off the appliance. Turn off the breaker. After Long Periods of Disuse Clean the air filter and install it in the indoor unit.

  • Page 41: Troubleshooting

    TROUBLESHOOTING TROUBLESHOOTING Before Calling for Service Please check the following before you contact the service centre. If the problem persists, contact your local service centre. NOTE • Some functions may not be supported, depending on the model. Self-Diagnosis Function This appliance has a built-in Self-Diagnosis function. If an error occurs, the LED of the indoor unit will flash in 2-second intervals.
  • Page 42 TROUBLESHOOTING Symptoms Possible Cause & Solution The fan speed cannot The airflow generated by the air conditioner may be automatically be adjusted. adjusted during operation. • When the air conditioner reaches the set temperature, it reduces the airflow rate to avoid generating cool airflow when heating, or to minimize energy consumption and indoor humidity change when cooling.
  • Page 43 TROUBLESHOOTING Symptoms Possible Cause & Solution The appliance does not Air is not circulating properly. emit cool air. • Make sure that there are no curtains, blinds, or pieces of furniture blocking the front of the appliance. The air filter is dirty. •...

  • Page 44: Performance

    TROUBLESHOOTING Symptoms Possible Cause & Solution The air conditioner When the appliance reaches the desired temperature, the airflow rate changes generated reduces in order to avoid generating cool airflow during heating, or to airflow during minimize energy consumption and indoor humidity change during operation.

  • Page 45: Wi-Fi

    • Find the Wi-Fi network connected to your smartphone and remove it, then connected to the Wi-Fi register your appliance on LG ThinQ. network. Mobile data for your smartphone is turned on. • Turn off the Mobile data of your smartphone and register the appliance using the Wi-Fi network.

  • Page 46: Calling For Service

    TROUBLESHOOTING Calling for Service Situations in which Calling for Service is Necessary If the appliance is in one of the following situations, please call the service. • Anything abnormal, such as a burning smell, loud noises, etc., occur; - Turn off the appliance and circuit breaker. - Never try to repair or restart the appliance yourself.

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