LG LW2521ERSM User Manual

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EN ENGLISH

*MFL72002121*

Copyright © 2023 LG Electronics Inc. All Rights Reserved

MFL72002121

Rev.01_092623

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

LW1821ERSM

LW1822ERSM

LW2521ERSM

LW2522ERSM

LW1824RD

LW2524RD

Scan to see the online manual.

Questions and Answers:

D
Dana GallagherAug 14, 2025
How to troubleshoot LG LW2521ERSM Air Conditioner that won't start?
- S
  Steven GonzalezAug 15, 2025
  If your LG Air Conditioner isn't starting, ensure it's fully plugged into the outlet. Check your house's fuse or circuit breaker 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 the unit. Also, check the current interrupter device by pressing the RESET button on the power cord plug. If the reset button won't stay engaged, stop using the air conditioner and contact a service technician.
M
Michael WilkersonAug 17, 2025
What to do if LG Air Conditioner does not cool enough?
- D
  Dr. Michael Bates Jr.Aug 18, 2025
  If your LG Air Conditioner isn't cooling properly, make sure curtains, blinds, or furniture aren't blocking the front of the unit. Adjust the temperature setting to be lower than the current room temperature. Allow time for the room to cool down after turning the unit on. Ensure cold air isn't escaping through open registers and cold air returns. If the cooling coils are iced up, refer to the 'Air conditioner freezing up' information.
C
cooperrobertAug 25, 2025
Why is my LG Air Conditioner dripping water indoors?
- M
  mariacastroAug 26, 2025
  If water is dripping indoors from your LG Air Conditioner, make sure the unit slants slightly from the front to the rear. This ensures proper water disposal to the outside.
U
uboltonAug 28, 2025
Why is my LG LW2521ERSM Air Conditioner making noise when cooling?
- N
  nathanmaxwellAug 28, 2025
  If your LG Air Conditioner is making noise when cooling, it's likely due to normal air movement sounds. If the noise is too loud, try setting the FAN to a lower setting. Window vibration could also be the cause due to poor installation; refer to the installation instructions or check with the installer.
G
Greg LangAug 31, 2025
What to do if LG LW2521ERSM is not connecting to the Wi-Fi?
- K
  Kathy GarciaSep 1, 2025
  If your LG Air Conditioner isn't connecting to Wi-Fi, try moving the router closer to the air conditioner or install a Wi-Fi repeater (signal booster). Also, ensure you're selecting the correct wireless router and that it's set to 2.4 GHz.
D
Dr. Ashley NunezSep 4, 2025
Why can't I connect the LG ThinQ App to my LG LW2521ERSM?
- L
  Lisa VillarrealSep 4, 2025
  To resolve issues connecting the LG ThinQ App to your LG air conditioner, first ensure the air conditioner is turned on. Also, check that your wireless router is turned on.
I
ivan22Sep 7, 2025
Why is remote sensing deactivating prematurely on my LG Air Conditioner?
- J
  Jennifer FowlerSep 7, 2025
  If your LG Air Conditioner remote sensing is deactivating prematurely, ensure the remote control is within a 20 feet range and 120° radius of the front of the unit and that there are no obstructions blocking the remote control signal.
N
Nathan PetersonSep 10, 2025
Why does water collect in base pan of LG LW2521ERSM?
- A
  Alicia AndersonSep 12, 2025
  If water collects in the base pan of your LG Air Conditioner, it's typically due to moisture removed from the air. This is normal for a short period in areas with low humidity and normal for a longer period in very humid areas.

LG LW2521ERSM Specifications

General

Type	Window Air Conditioner
Cooling Capacity	25, 000 BTU
Energy Efficiency Ratio (EER)	11.6
Voltage	208/230V
Refrigerant	R-410A
Dimensions (WxHxD)	25.5 x 21.5 x 26.5 inches
Noise Level (Indoor)	54 dB
Width	26 inches
Noise Level	54 dB

Summary

SAFETY INSTRUCTIONS

IMPORTANT SAFETY INSTRUCTIONS

Detailed warnings and precautions for user safety, including what to do in case of hazards.

INSTALLATION

Electrical Data

Specifications for power supply, receptacle types, and circuit breakers for correct installation.

How to Install the Unit

Step-by-step instructions for physically installing the air conditioner into a window.

OPERATION

Control Panel and Remote Control

Explanation of buttons and functions on the unit's control panel and the remote.

SMART FUNCTIONS

LG ThinQ Application

How to connect and use the LG ThinQ app for smart appliance control.

Smart Diagnosis™

Using the smart diagnosis feature to help troubleshoot appliance issues.

TROUBLESHOOTING

Before Calling for Service

Initial checks to perform for common issues before contacting customer support.

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