Help Library: Help Library: [LG Air Conditioner] How to read error codes

[LG Air Conditioner] How to read error codes

Troubleshooting Home Air Conditioners 04/08/2026

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<div class="content-service-view">
<p class="info-desc">
LG air conditioner error codes differ depending on the model. For
wall-mounted units, check the LED on the remote, while stand-type models
display them on the panel or LED. <br/>See the examples and
instructions for reading the codes.
</p>

<h2 class="tit">How to Check for Errors in LG Air Conditioners</h2>

<h3 class="sub-tit">
How to Check for Errors in Wall-Mounted/Stand-Type Air Conditioners
</h3>

<h4>How to Read Error Codes on Wall-Mounted or Floor-Standing ACs</h4>
<p>
The first LED indicates the ones digit of the error code.<br/>
The second LED indicates the tens digit.<br/>
(Example: If the first LED blinks 5 times steadily, it means error code
CH05.)
</p>

<h4>How to Read Error Codes on Floor-Standing ACs</h4>
<p>
The display panel shows an error.<br/>
(Example: If the display shows CH → 2 → 37 in sequence, it means error
code CH237.)
</p>

<h3 class="sub-tit">How to Read Error Codes on Portable or Window ACs</h3>
<p>LCD Models: The error code is shown directly on the screen.</p>

<p>
LED Models: The error code is displayed in the following sequence: CH →
02 → CH → 02 (repeating)
</p>

<h3 class="sub-tit">
How to Read Error Codes on Ceiling-Mounted Cassette Acs
</h3>

<li>
<strong>LED indicator</strong>
<p>
The indicator color is either green or red, depending on the model.
The number of blinks indicates the number (1, 2, 3, etc.), and the
interval between blinks indicates the digit:
</p>

<li><strong>Long interval</strong>: Hundreds digit</li>

<li><strong>Medium interval</strong>: Tens digit</li>

<li><strong>Short interval</strong>: Ones digit</li>
</ul>
<p>
Error codes can be difficult to read in real time. Try recording a
video with your phone to easily check the repeating blink pattern.
</p>        </li>

<li>
<strong>Display Panel</strong>
<p>
"CH" and the error code alternate on the display every 0.5 seconds.
</p>        </li>
</ul>

<p>➔ <strong>1-Way Models</strong> (1 air outlet) with 1 LED indicator</p>

<p>
➔ <strong>2-Way / 4-Way Models</strong> (2 or 4 air outlets) with 1 LED
indicator
</p>

<p>
➔ <strong>1-Way / 2-Way / 4-Way Models</strong> with 4 LED indicators
</p>

<p>
➔ <strong>1-Way Models</strong> with no LED indicator (Display panel
only)
</p>

<h3 class="sub-tit">How to Check Errors in the ThinQ App</h3>

<ol>

<li class="txt-idt">
1. On the Home screen, tap the [Menu] tab at the bottom, then select
[Smart Diagnosis].
</li>

<li class="txt-idt">
2. Select your product and follow the on-screen instructions to run
[Smart Diagnosis].
</li>

<li class="txt-idt">
3. Review the diagnostic results to check your product's detailed
status and get troubleshooting guidance.
</li>

<li class="txt-idt">
4. If the issue persists, contact LG Customer Support for further
assistance.
</li>
</ol>

<p>
※ Note: If an error occurs during operation and cannot be resolved by
restarting the product, it will be displayed in the ThinQ app. <br/>
(Some errors may appear immediately depending on the type.)
</p>
<p class="help-txt">
This guide was created for all models, so the images or content may be
different from your product.
</p>    </div>

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[LG Air Conditioner] How to read error codes

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