Help library: Help library: [LG Air Conditioner Heating][Buried Duct] Heating is weak. Heating is failed

[LG Air Conditioner Heating][Buried Duct] Heating is weak. Heating is failed

Troubleshooting Multi Split, Single Split, Ventilation 09/15/2025

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<h2 class="tit">Causes and Symptoms</h2>

<li>Filter is clogged by lots of dusts.</li>

<li>The target temperature is set low.</li>

<li>The opening/closing circular fan at the wind outlet vent is adjusted incorrectly.</li>
</ul>

<h3 class="sub-tit">Is the filter cleaned?</h3>
<p class="info-desc idt">➔ If there are lots of dusts in the filter, then heating might feel weak or fail, thus
make sure to clean it periodically.</p>        <p>The filter for the buried duct type air conditioner is installed on the ceiling separately from the product.
</p>

<h3 class="sub-tit">Did you try to raise the target temperature for use?</h3>
<p class="info-desc idt">➔ Raise the target temperature to 30℃(86°F) and set the fan speed to high for use.</p>        <p>
If the indoor temperature reaches the target temperature, the heating may feel weaker or even fail.<br/>
Indoor temperature detected by the product may differ from the actual temperature felt by a user.
</p>

<h3 class="sub-tit">Did you try to adjust the opening/closing circular fan at the wind outlet vent?</h3>
<p class="info-desc idt">➔ Adjust the circular plate at the wind outlet vent.</p>        <p>
<strong>During heating operation, if the cold air does not spread widely but only certain areas are
cool</strong><br/>
If the circular adjustment fan at the wind outlet vent is closed, then air flow will be directed
downward.<br/>
Turn the wind outlet vent CCW to make sure that the circular fan sticks out of the reference plane on the
ceiling.<br/>
Cold air spreads widely in the big space. (Cold air moves downward.)
</p>        <p>
<strong>During heating operation, if warm wind does not reach the bottom</strong><br/>
If the circular adjustment fan of the wind outlet vent is widely opened, air flows will stay around the
ceiling without traveling to the bottom.<br/>
Turn the circular fan CW to make sure that it is above the reference plane on the ceiling.<br/>
As hot wind is concentrated on the bottom, it improves the heating performance.
</p><p class="txt-idt">※ Direction of cold/hot wind due to the adjustment of the circular fan at the wind outlet
vent</p>

<div class="con-view">
Turn the circular fan CW to raise it, Turn it CCW to lower it.<br/>
(It requires adequate wind outlet vent control suitable for heating and cooling.)
</div>
</div>
<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 Heating][Buried Duct] Heating is weak. Heating is failed

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