Help library: Help library: How to Troubleshoot Error Codes CH01, CH02, CH06, CH12, CH41, CH42, CH43, CH44, CH45, CH46, CH47, CH48, E1, E2, E3, E7, E8, F2, F3, CH21, CH23, CH26, CH29, and E9 on Your LG Air Conditioner

How to Troubleshoot Error Codes CH01, CH02, CH06, CH12, CH41, CH42, CH43, CH44, CH45, CH46, CH47, CH48, E1, E2, E3, E7, E8, F2, F3, CH21, CH23, CH26, CH29, and E9 on Your LG Air Conditioner

Troubleshooting Accessory, Multi Split, Multi V, Single Split, Ventilation 08/20/2026

<div class="content-service-view" itemtype="HowTo">
<p class="description">
If your air conditioner displays error codes CH01, CH02, CH06, CH12, CH41, CH42, CH43, CH44, CH45, CH46, CH47, CH48, E1, E2, E3, E7, E8, F2, or F3, it indicates a problem with a sensor.<br/>
Error codes CH21, CH23, CH26, CH29, and E9 indicate a problem with the outdoor unit compressor or circuit board. <br/>
To clear the error, reset your air conditioner. If the error code persists, contact LG Support for service.
</p>

<h3 class="warn-tit">Warning</h3>

<li>Do not disassemble the air conditioner or replace internal parts yourself. Doing so may cause fire, electric shock, serious injury, or death.</li>

<li>If the same error code appears again after resetting the air conditioner, stop using the product and request service to prevent further damage.</li>
</ul>

<h2 class="tit mainName">Why Does the Error Code Appear?</h2>
<p>Your air conditioner displays an error code when its self-diagnostic system detects a problem with an internal component. To prevent damage, your air conditioner will stop operating.<br/>
If your air conditioner displays error codes CH01, CH02, CH06, CH12, CH41, CH42, CH43, CH44, CH45, CH46, CH47, CH48, E1, E2, E3, E7, E8, F2, or F3, it indicates a sensor-related problem. <br/>
This may be caused by a faulty temperature or pipe sensor, a loose or disconnected sensor, a main circuit board error, or a temporary electrical issue. <br/>
Alternatively, error codes CH21, CH23, CH26, CH29, and E9 indicate a problem with the outdoor unit compressor or its control circuits. <br/>
These codes can be triggered by a temporary power issue, a malfunctioning outdoor unit compressor, a compressor drive or protection circuit error, or a faulty electrical component inside the outdoor unit.</p>

<h2 class="tit">How to Troubleshoot the Error Codes</h2>

<h3 class="name">Step 1. Reset the Power</h3>

<li>1.Unplug your air conditioner. If you cannot access the power plug, turn off the circuit breaker.</li>

<li>2.Wait about five minutes.</li>

<li>3.Plug your air conditioner back in or turn on the circuit breaker.</li>

<li>4.Check if the error code has cleared.</li>
</ol>
</div>

<h3 class="name">Step 2. Still Need help?</h3>

<div class="text">
<p>If the issue persists after following the steps above, you can get further support through LG Chatbot on our website or by requesting a technician visit.</p>        </div>
</div>

<h2 class="tit">Frequently Asked Questions (FAQ)</h2>

<span aria-label="Question" role="img">Q.</span> The Error Code Disappeared After I Reset the Air Conditioner. Can I Continue Using It?</dt>
<dd class="text">

<span aria-label="Reply" role="img">A.</span> This usually happens due to a temporary power or communication issue. You can continue using your air conditioner if it operates normally. If the error code persists, stop using your air conditioner and contact LG Support for service. A repeated error may indicate an internal circuit or wiring problem.</dd>
</dl>
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<p class="mobile-txt">Move left or right to check the contents.</p><p class="help-txt">
This guide was created for all models, so the images or content may be different from your product.
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How to Troubleshoot Error Codes CH01, CH02, CH06, CH12, CH41, CH42, CH43, CH44, CH45, CH46, CH47, CH48, E1, E2, E3, E7, E8, F2, F3, CH21, CH23, CH26, CH29, and E9 on Your LG Air Conditioner

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