How to Change the Water Filter on an LG Refrigerator

Where to find your LG water filter and what type you have

Most LG refrigerators have the water filter in one of two places: inside the refrigerator compartment in the upper right corner, or underneath the fridge behind the front grille. Open your refrigerator and look in the top right—if you see a cylindrical cartridge about the size of a soda can, that is an internal filter. If not, you will find it below the fridge. The filter sits in a housing that twists or slides, depending on your model.

Write down your LG model number before you buy a replacement. You can find it on a sticker inside the fridge, usually on the side wall or back. LG filters are model-specific, and buying the wrong one wastes money. Common LG filter models include the LT500P, LT600P, LT700P, and LMXS30776S, but your refrigerator may use a different one. You can search your model number on LG's website or call their customer service line to confirm which filter you need.

Key Takeaways

LG water filters sit either inside the fridge in the upper right corner or underneath behind the front grille, and you must know your model number to buy the correct replacement.
The filter twists counterclockwise to remove and clockwise to install, or slides straight out depending on your model—check your manual or the filter housing for which motion applies.
You should flush the new filter by running water through the dispenser for 3 to 5 minutes before drinking to clear air and loose carbon particles.
Most LG filters last 6 months under normal use, and your refrigerator will alert you when replacement is due through a light or message on the display panel.

How to remove the old filter

Before you start, turn off the water supply to your refrigerator if your model has a shutoff valve underneath or behind the unit. Not all LG refrigerators have one, but if yours does, closing it prevents water from spraying when you disconnect the filter. If you cannot find a shutoff valve, you can still remove the filter—just be ready for a small amount of water to drip out.

For filters inside the fridge, locate the filter cartridge in the upper right corner. Grip it firmly and turn it counterclockwise about a quarter turn until it stops. The cartridge will slide out toward you. For filters underneath the fridge, remove the front grille by pressing the clips on both sides and pulling it toward you. The filter housing will be visible. Twist the filter housing counterclockwise and pull it straight down to remove it.

Have a towel or small container ready—a small amount of water will drip from the old filter as you remove it. This is normal. Set the old filter aside; you can recycle it at many grocery stores or through LG's mail-back program if you want to avoid throwing it in the trash.

Installing the new filter

Before you install the new filter, check the rubber gasket—the small rubber ring on the end of the filter. If it looks cracked or dried out, wipe it gently with a damp cloth. A dry gasket can fail to seal properly and cause leaks. The gasket on the new filter should be soft and pliable.

For internal filters, insert the new cartridge into the slot and turn it clockwise until you feel it stop. Do not force it—it should turn smoothly and stop on its own when seated. For external filters under the fridge, insert the new filter into the housing and turn it clockwise until snug. Again, do not over-tighten; you want it firm but not forced.

Once the filter is installed, turn the water supply back on if you shut it off. Check the connection point for drips for the first minute. A small drip at the very beginning is normal as the seal settles, but steady dripping means the filter is not seated correctly. If that happens, turn off the water, remove the filter, and reinstall it.

Flushing the new filter before use

A new filter contains loose carbon particles and air that need to be cleared before you drink the water. Go to your refrigerator's water dispenser and run water into a sink or large container for 3 to 5 minutes without stopping. The water may look cloudy or taste slightly off during this time—that is the carbon flushing out. This step is important and should not be skipped.

After flushing, fill a glass and taste the water. It should taste normal. If it still tastes like plastic or carbon, run the dispenser for another minute or two. Once the water tastes clean, your filter is ready to use.

Resetting the filter indicator light

Most LG refrigerators have a filter status light or message on the display panel that tells you when the filter needs changing. After you install a new filter, you must reset this indicator so it tracks the life of the new filter correctly. The reset method depends on your model.

For many LG models, press and hold the "Filter" or "Water Filter" button on the control panel for 3 to 5 seconds until the light changes or a message appears confirming the reset. Some models require you to press a different button combination—check your user manual or look for a reset button near the filter housing. If you cannot find the reset instructions, call LG customer service with your model number and they will walk you through it.

If you do not reset the indicator, it will continue counting down from the old filter's remaining life and may tell you to change the filter again before it actually needs changing. Resetting takes less than a minute and prevents confusion later.

When to call a professional plumber

Most filter changes are straightforward and do not require a plumber. However, call a professional if water leaks from the connection after you have reinstalled the filter twice and the leak persists, if you cannot locate the water shutoff valve and water sprays when you remove the old filter, or if your refrigerator has no water dispenser but the manual says it should have a filter.

You should also contact LG directly if the new filter does not fit into the housing, if the filter housing itself is cracked or damaged, or if the water dispenser stops working after you change the filter. These issues point to a problem beyond the filter itself, and LG can advise whether the refrigerator needs service.

How often to change your LG water filter

LG recommends changing the water filter every 6 months under normal household use. If you have a large family, use the ice maker frequently, or have hard water, you may need to change it more often—every 3 to 4 months. If you live alone and rarely use the dispenser, you might stretch it to 9 months, but do not go longer than a year.

Your refrigerator's filter indicator light is the most reliable guide. When it turns on or displays a message, change the filter within a week or two. The light does not mean the filter has stopped working entirely, but it has lost enough capacity that water quality and flow will start to decline. Waiting until the light comes on is better than guessing based on the calendar.

Frequently Asked Questions

Can I use a third-party filter instead of an LG brand filter?

Yes, many third-party filters work in LG refrigerators and often cost less. Look for filters certified to fit your specific LG model number. Check online reviews and confirm the filter has the same dimensions and connection type as the original. Third-party filters should meet NSF standards for water safety, which most reputable brands do.

What if water leaks from under my refrigerator after I change the filter?

First, check that the filter is seated all the way in and twisted or pushed as far as it will go. Turn off the water supply, remove the filter, and reinstall it, making sure the rubber gasket is clean and not pinched. If the leak continues, the gasket may be damaged or the housing cracked. Contact LG to order a replacement gasket or housing.

Do I have to reset the filter light, or will it reset on its own?

You must reset it manually—it will not reset on its own. If you skip this step, the light will continue counting down from the old filter's remaining life and give you false alerts. Check your manual for the reset button or button combination for your model.

Is the water safe to drink right after I install a new filter?

Not until you flush it. Run water through the dispenser for 3 to 5 minutes first to clear carbon particles and air. After flushing, the water is safe to drink. Skipping this step can leave a plastic or carbon taste in your water.

What should I do with the old filter?

Many grocery stores and home improvement retailers have recycling programs for water filters. LG also offers a mail-back program where you can send the old filter to them for recycling. If neither option is available, you can throw it in the trash, though recycling is better for the environment.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.