LG LW1821HRSM User Manual

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www.lg.com

EN ENGLISH

*MFL70559723*

Copyright © 2020 - 2021 LG Electronics Inc. All Rights Reserved

MFL70559723

Rev.05_110621

AIR CONDITIONER

Read this owner’s manual thoroughly before operating the appliance

and keep it handy for reference at all times.

OWNER’S MANUAL

TYPE : WINDOW

LW1816HR

LW2416HR

LW1821HRSM

LW2421HRSM

Questions and Answers:

S
Steven ShepardAug 14, 2025
How to troubleshoot an LG Air Conditioner that does not start?
- E
  Erik HigginsAug 14, 2025
  If your LG Air Conditioner isn't starting, first ensure it's fully plugged into the outlet. Check your house's fuse or circuit breaker box and replace the fuse or reset the breaker if needed. If there was a power failure, turn the mode control to off, and wait 3 minutes after power is restored before restarting to prevent compressor overload. Also, check the current interrupter device; press the RESET button on the power cord plug. If it won't stay engaged, stop using the unit and contact a qualified technician.
C
Craig MannAug 17, 2025
Why is my LG LW1821HRSM Air Conditioner not cooling properly?
- K
  Karen JohnstonAug 17, 2025
  If your LG Air Conditioner isn't cooling properly, make sure nothing is blocking the front of the unit, such as curtains, blinds, or furniture. Ensure the temperature is set lower than the current room temperature. Clean the air filter every 2 weeks, as a dirty filter restricts airflow. If the room was hot, allow time for it to cool down after turning on the unit. Check for open furnace floor registers or cold air returns that might be letting cold air escape. Finally, inspect for iced-up cooling coils; set the mode control at High Fan or High Cool.
C
Cheryl SullivanAug 21, 2025
Why is my LG Air Conditioner making noise when cooling?
- W
  wendymartinAug 21, 2025
  Some noise during cooling with your LG unit is normal due to air movement. If it's too loud, try setting the FAN to a lower setting. Window vibration might also cause noise, indicating poor installation. In this case, refer to the installation instructions or consult with the installer.
A
Annette BrooksAug 26, 2025
Why isn’t my LG Air Conditioner connecting to the Wi-Fi?
- J
  Jean SmithAug 26, 2025
  If your LG Air Conditioner is not connecting to Wi-Fi, the Wi-Fi router might be too far away. Try moving the router closer to the air conditioner or consider installing a Wi-Fi repeater (signal booster). Also, ensure you're selecting the correct wireless router and that it is set to 2.4 GHz.
A
arnoldjacobAug 29, 2025
What causes an LG Air Conditioner to start freezing up?
- B
  Brian ParsonsAug 29, 2025
  If your LG Air Conditioner is freezing up, it's likely due to iced-over cooling coils. Ice can block airflow and prevent the unit from cooling the room effectively. Set the mode control to High Fan or High Cool to address this.
B
Brianna PorterSep 1, 2025
Why does my LG LW1821HRSM Air Conditioner turn on and off rapidly?
- N
  nicholegraySep 1, 2025
  If your LG Air Conditioner turns on and off rapidly, a dirty air filter could be restricting airflow; try cleaning it. If the outside temperature is extremely hot, refer to the installation instructions or check with the installer.
R
robert91Sep 5, 2025
Why is the remote sensing deactivating prematurely on my LG LW1821HRSM?
- D
  derek58Sep 5, 2025
  If remote sensing is deactivating prematurely on your LG Air Conditioner, ensure the remote control is within 20 feet and a 120° radius of the unit's front. Also, make sure there are no obstructions blocking the remote control signal.
T
Tyler NormanSep 9, 2025
Why am I having trouble connecting my LG appliance and smartphone to the Wi-Fi network?
- R
  Robyn StevensSep 9, 2025
  If you're experiencing trouble connecting your LG appliance and smartphone to a Wi-Fi network, double-check that you've entered the correct Wi-Fi password. If not, delete your home Wi-Fi network and begin the registration process again. Make sure the Mobile data on your smartphone is turned off during registration. The wireless network name (SSID) should only use English letters and numbers, avoiding special characters. Verify that your router frequency is set to 2.4 GHz, as only this frequency is supported. If the appliance is too far from the router, move it closer or install a Wi-Fi repeater to improve the signal.

LG LW1821HRSM Specifications

General

Brand	LG
Model	LW1821HRSM
Category	Air Conditioner
Language	English

Summary

SAFETY INSTRUCTIONS

General Safety Guidelines

Explains safety alert symbols, WARNING, and CAUTION terms.

Important Safety Instructions

Crucial safety precautions for installation and operation.

Grounding Instructions

Guidelines for proper electrical grounding to prevent shock hazards.

Operational Precautions

Safety advice for operating the appliance, including maintenance.

INSTALLATION

Electrical Data

Information on power requirements, plugs, and electrical safety.

How to Install the Unit

Step-by-step instructions for mounting the air conditioner in a window.

Window Requirements

Storm Window Requirements

Preparation of Cabinet

Cabinet Installation

Detailed instructions for securing the air conditioner cabinet within the window frame.

Unit Installation

Final steps for installing the main unit into the prepared cabinet and window.

TROUBLESHOOTING

Troubleshooting Common Issues

Lists common problems and their solutions for the air conditioner.

WARRANTY

Warranty Coverage and Service

Details what the limited warranty covers, exclusions, and how to obtain service.

Dispute Resolution Procedure

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