How to Change an LG Air Filter: A Step-by-Step Guide for Better Air Quality and Device Longevity​

2025-12-06

Changing your LG air filter regularly is one of the simplest yet most impactful ways to maintain clean indoor air, boost your HVAC or air purifier’s efficiency, and extend the life of your device. Whether you own an LG air purifier, split AC, or window unit, a fresh filter traps dust, pollen, pet dander, and other pollutants more effectively, ensuring your home stays healthy and your system runs smoothly. In this guide, we’ll walk you through why filter replacement matters, how to spot when it’s time, and exactly how to do it—no technical expertise required.

Why Changing Your LG Air Filter Is Non-Negotiable

Before diving into the “how,” let’s clarify the “why.” Your LG air filter works 24/7 to capture airborne particles, but over time, it becomes clogged with debris. Here’s what happens if you delay replacement:

1. Reduced Air Quality

A dirty filter can’t trap pollutants as efficiently. Dust, mold spores, and allergens recirculate back into your home, worsening symptoms for allergy sufferers, asthmatics, or anyone sensitive to poor air quality. Studies by the Environmental Protection Agency (EPA) note that indoor air can be 2–5 times more polluted than outdoor air—with a clogged filter often contributing to the problem.

2. Higher Energy Bills

When your LG device’s filter is blocked, it has to work harder to push air through. This strains the motor, increasing energy consumption. LG estimates that a dirty filter can raise energy use by up to 15%, leading to unnecessary costs over months or years.

3. Shorter Device Lifespan

Clogged filters force your system to overexert itself. This extra strain can damage components like fans, motors, or coils, potentially leading to costly repairs or premature replacement. LG’s own maintenance guidelines emphasize filter changes as a key factor in extending equipment life.

How to Know When It’s Time to Change Your LG Air Filter

LG devices are designed to alert you, but it’s smart to check proactively. Here are the main indicators:

1. The Device’s Indicator Light

Most LG air purifiers and AC units have a filter replacement indicator. For example:

  • Air Purifiers: Models like the LG PuriCare or LP1419IVSM flash a red light or display “Change Filter” on the screen when the filter needs replacing.

  • Air Conditioners: Split ACs or window units may show a “Filter” warning on the remote control or unit display.

Note:Some devices reset the indicator automatically after filter installation, while others require manual resetting (we’ll cover this later).

2. Elapsed Time Since Last Change

Even without an alert, follow LG’s general guidelines:

  • Standard Fiberglass/Pre-Filters: These capture larger particles (dust, hair) and should be checked monthly. Replace every 1–3 months, depending on pet ownership or dust levels.

  • HEPA or Activated Carbon Filters: Found in air purifiers, these trap smaller particles (pollen, smoke, odors). Replace every 6–12 months, though heavy use may require more frequent changes.

  • AC Evaporator Coils/Filters: In split systems, the indoor unit’s filter (often washable) should be cleaned monthly and replaced annually if non-washable.

3. Visible Dirt or Reduced Airflow

Peek at the filter. If it’s gray or black with debris, or if you notice weak airflow from vents or the purifier, it’s time. Reduced cooling/heating performance in ACs is another red flag—clogged filters restrict airflow, making it harder to reach desired temperatures.

Preparing to Change Your LG Air Filter: Tools and Safety

Before starting, gather these items:

  • Replacement Filter: Match your device model. Check the label inside your current filter (e.g., “LG AA091EA”) or use LG’s online filter finder (support.lge.com). Avoid third-party filters unless they’re LG-certified—they may not fit or filter as effectively.

  • Screwdriver (if needed): Some models have screws securing the filter cover.

  • Soft Cloth or Vacuum: To clean the filter compartment before installing the new filter.

  • Gloves (optional): To avoid touching dirty filters.

Safety First:Always turn off and unplug your LG device before opening the filter compartment. For AC units, shut off power at the circuit breaker if working on central systems.

Step-by-Step: How to Change an LG Air Filter

The exact process varies slightly by device type, but these general steps apply to most LG air purifiers, ACs, and heaters.

For LG Air Purifiers (e.g., PuriCare Series, LP Models)​

  1. Turn Off and Unplug: Press the power button to turn off the purifier, then unplug it from the wall.

  2. Open the Filter Compartment: Most models have a front panel held by magnets or clips. Gently pull it open; some may require sliding upward.

  3. Remove the Old Filter: Pull the filter straight out. Note the direction of the airflow arrows (usually printed on the filter frame)—you’ll install the new one the same way.

  4. Clean the Compartment: Use a soft cloth or vacuum to remove dust from the compartment.

  5. Insert the New Filter: Align the airflow arrows with the “Airflow” icon inside the compartment (usually pointing downward or toward the back). Push until it clicks into place.

  6. Close the Compartment: Snap the front panel back into position.

  7. Reset the Indicator Light: On touchscreens, navigate to “Settings” > “Filter Reset” and confirm. Older models may require pressing and holding the “Filter” button for 3–5 seconds.

For LG Split Air Conditioners (Indoor Unit)​

  1. Power Down: Turn off the AC via the remote and unplug the indoor unit if accessible. For central systems, switch off the breaker.

  2. Access the Filter Cover: Locate the filter panel on the front of the indoor unit (usually at the bottom). Slide it upward or outward to remove.

  3. Remove the Old Filter: Pull the filter out horizontally. Washable filters can be rinsed with water (let dry completely before reinstalling); non-washable ones must be replaced.

  4. Clean the Coil (Optional): If your filter is washable, use a soft brush to gently clean the evaporator coil behind the filter—this improves heat transfer and cooling efficiency.

  5. Install the New Filter: Slide the new filter back into place, ensuring it sits flush.

  6. Replace the Cover: Slide the panel back into position until it clicks.

  7. Reset the Filter Alert: On the remote, press the “Filter” button once to clear the warning.

Post-Replacement Tips: Maximizing Performance

Changing the filter is just the start. Here’s how to keep your LG device running optimally:

  • Test the Airflow: After installation, turn the device back on. You should feel stronger, steadier airflow. Weak airflow may mean the filter isn’t seated correctly.

  • Schedule Reminders: Use your phone calendar to note the replacement date. Apps like LG ThinQ (for smart devices) send push notifications when it’s time.

  • Store Extra Filters: Keep a spare filter on hand to avoid delays. Store them in their original packaging in a cool, dry place—moisture can damage the filter media.

  • Monitor Air Quality: If you have a smart LG purifier, check the app for real-time PM2.5 or VOC readings. A drop post-replacement confirms the new filter is working.

Common Issues and Troubleshooting

Even with careful installation, you might encounter hiccups. Here’s how to fix them:

Issue 1: The Filter Indicator Still Lights Up After Replacement​

  • Cause: The sensor may still detect debris or needs manual reset.

  • Fix: Clean the sensor (often a small metal plate near the filter compartment) with a dry cloth. If using a smart model, ensure you followed the app’s reset instructions.

Issue 2: New Filter Smells Odd​

  • Cause: Some activated carbon filters emit a faint “new” odor as they off-gas.

  • Fix: Run the device on high for 24 hours with windows open. If the smell persists, contact LG support—rarely, it may indicate a defective filter.

Issue 3: Device Feels Louder After Filter Change​

  • Cause: The new filter may be too thick for the compartment, forcing the fan to work harder.

  • Fix: Double-check the filter model number. If it’s correct, remove the filter and inspect for warping or damage.

Why Choose LG Filters Over Third-Party Options?

While generic filters may seem cheaper, they often fall short:

  • Poor Fit: Ill-fitting filters allow unfiltered air to bypass, reducing efficiency.

  • Inferior Materials: Non-LG filters may use lower-grade activated carbon or fiberglass, trapping fewer pollutants.

  • Voided Warranty: Using unauthorized parts could void your LG device’s warranty. LG’s official filters are tested to match your device’s specs, ensuring optimal performance.

Final Thoughts: A Small Habit with Big Rewards

Changing your LG air filter is a quick, low-cost task with outsized benefits: cleaner air, lower bills, and a longer-lasting device. By following this guide—whether you own a purifier, AC, or heater—you’ll take control of your indoor environment and protect your family’s health. Remember: set reminders, buy genuine filters, and don’t ignore those indicator lights. Your lungs (and your wallet) will thank you.

Now that you know how to change your LG air filter, mark your calendar and get started—your home deserves the best.

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