LG LT800P Refrigerator Water Filter Replacement Guide

Verify the filter family first

LT800P commonly appears with identifiers such as ADQ73613401, but part-number lists can change across packages. The refrigerator model is stronger evidence than a single cross-reference. Use LG’s official finder and the HomeMemory LG fit guide.

The genuine product verified for HomeMemory is Amazon ASIN B00X3DWMS4. That identity does not prove it fits your refrigerator. It proves which product HomeMemory is presenting after LG compatibility is confirmed.

Do not substitute LT1000P or LT700P based on price, delivery speed, or similar shape. Read the LG filter comparison if you are uncertain.

Identify the housing style

LG’s current instructions separate at least two LT800P replacement locations: beside the door and in the roof area. A door-side installation may require removing a lower door bin, while a roof installation has its own access and alignment. The exact manual decides which steps apply.

Before opening the housing, clear food and bins that obstruct safe access. Put a towel below the cartridge. Photograph the old locked position and note the direction of rotation. Do not remove structural shelves or covers that the manual does not identify.

If the refrigerator has a water shutoff procedure, follow it. A small amount of residual drainage is normal during removal; ongoing water flow means the supply needs attention.

Replace LT800P without forcing it

Grasp and rotate the old cartridge counterclockwise or release it as the specific housing directs. Keep it upright over the towel. Inspect the reachable receiver for obvious damage, a broken neck, or foreign material.

Remove the protective cap from the new LT800P only when ready. Keep the O-ring and connection clean. Insert the cartridge fully, rotate it clockwise to lock, and return any bin or cover to its proper position.

The correct motion should be firm but controlled. If the cartridge refuses to enter or lock, compare the family again. Do not shave tabs, swap seals, lubricate the connector with household products, or use tools to force rotation.

Restore the supply if it was shut off. Inspect the filter before and after the first short dispense. A continuing leak requires immediate correction rather than more flushing.

Complete the flush and reset

LG instructs owners to dispense 2.5 gallons through a newly installed LT800P. Use a measured container and manageable dispenser cycles. This clears trapped air and installation residue while giving you repeated chances to inspect the housing.

Sputtering can happen at first. Flow should stabilize. If water tastes unusual after the full flush, review the old-filter condition, source water, clean container, dispenser cleanliness, and exact installation rather than assuming every taste issue is a cartridge defect.

After the filter is installed, leak-free, and flushed, hold the applicable Water Filter or Filter Reset control for about three seconds. The LG reset guide covers the logic when the panel does not respond.

Save the installation date and set a six-month reminder. Heavy use, lower flow, taste changes, or a model alert can justify an earlier replacement.

Verify the installation with evidence

Do not judge the job only by whether water comes out. A partly seated cartridge may still pass water. Inspect the lock position and housing, dry the surrounding surface, then return several minutes later to look for new moisture. Check again after normal ice and water use begins.

Compare the post-flush stream with the condition before replacement. If pressure remains poor, confirm the supply valve is fully open and the tubing was not moved or kinked while clearing access. A filter cannot correct low household pressure, a frozen line, or a failing inlet component.

If taste or odor remains, use a clean container and consider the dispenser nozzle, old ice, source water, and refrigerator cleanliness. Replacing LT800P is one maintenance step, not a universal cure for every water symptom.

Turn LT800P into a recurring maintenance item

Save the refrigerator model, LT800P family, verified ASIN, seller receipt, and physical installation date. A good record answers three future questions immediately: what fits, when it was changed, and where it came from.

Create an advance reminder so a replacement can be purchased before the current cartridge is overdue. When the next change occurs, note whether the filter still had normal flow. Over time, the record reveals whether the household typically reaches six months comfortably or needs earlier inspection because of water use and local conditions.

Keep the old family name visible to other household members. “LG filter” is not specific enough, and a well-intentioned purchase of LT1000P or LT700P can create an unnecessary return.

Handle a spare LT800P responsibly

Keep an advance cartridge sealed, clean, and dry. Record where it is stored and mark it “already owned” in HomeMemory so the next reminder does not prompt a duplicate purchase. Do not open the cap to compare connectors casually.

If the refrigerator changes before the spare is used, verify the new appliance independently. Brand continuity is not filter continuity. A genuine LT800P remains the wrong product for a new LG model that uses another family.

Review the live Amazon offer at each purchase. The ASIN anchors the verified product record, while price, seller, quantity, and availability can change.

If the refrigerator is moved, inspect the water line and filter housing before resuming normal use. Moving can disturb tubing independently of the cartridge. Record the move as its own event so a later leak is not incorrectly attributed to the last LT800P replacement.

Keep the exact manual bookmarked with the appliance record. When a future replacement is performed by someone else, the documented housing location, lock direction, flush volume, and reset control remain available without guesswork.

Related LT800P troubleshooting

After a confirmed installation, use the dedicated guides for slow water, a new-filter leak, or an LG dispenser that does not work. Do not replace LT800P again until the symptom points to the cartridge.

Final Verdict

An LT800P change succeeds when four things agree: the complete refrigerator model, the exact filter family, the housing’s normal lock motion, and a leak-free 2.5-gallon flush. Finish by resetting and saving the date so the next replacement becomes planned maintenance instead of an emergency purchase.