Refrigerators · parts
LG LMXS30776S refrigerator water filter: LT800P
LT800P is a genuine LG refrigerator water filter rated for up to six months or 200 gallons. LG’s model support page links the exact owner manual and filter compatibility item; confirm the complete model code before ordering. LG 29.7-cu.-ft. four-door French-door refrigerator with CustomChill drawer, Door-in-Door, and integrated tall water/ice dispenser. This record stays within the exact model string and cartridge source listed by the manufacturer; it is not a broad brand-family compatibility claim.
Safety boundary
- Use the exact model owner’s manual before replacement. LG says some models allow replacement without closing the water valve and others may require it; follow the exact manual.
- Place a towel or cup below the filter for drips. Use the model’s LT800P instructions and do not force a misaligned cartridge.
- LG’s general LT800P guide says to dispense about 2.5 gallons after a new filter and then reset the indicator, but controls/method vary by model; follow the exact model manual if different.
- Stop and check for leaks before returning to normal dispensing. Do not use water filters as disinfection.
Compatibility requires a direct model listing, explicit supersession, or equivalent manufacturer evidence.
Models explicitly covered
These model identities have the source evidence listed below. Read the part decision and suffix limits before ordering.
Required identifiers
- Exact refrigerator model from rating plate: LMXS30776S.
- Full product/SKU code where applicable: LMXS30776S.ASTCNA0.
- Water-filter cartridge marking: LT800P.
- Do not substitute LT120F interior air filter.
Compatibility rules
- LG’s exact source for LMXS30776S names LT800P as the replacement refrigerator water filter.
- The fit claim applies only to the exact model code LMXS30776S.ASTCNA0; verify the label if suffixes or service modifications differ.
- Use LT800P for the refrigerator water system; the interior air/odor filter is separate.
Never assume
- LT800P fits every LG refrigerator or any model whose code only looks similar.
- An air/odor filter, such as the separate LT120F, is interchangeable with the water cartridge.
- The general LT800P instructions necessarily match the exact filter location/reset controls of this model; use the model owner manual.
- A certified reduction claim means the filter disinfects microbiologically unsafe water or makes unknown-quality water safe.
Exact model-to-cartridge receipt
- Appliance model named in manufacturer source: LMXS30776S.
- LG’s exact LMXS30776S product-support page identifies full SKU LMXS30776S.ASTCNA0 and explicitly lists “Compatible with LG LT800P Water Filter.” The model’s LG spec sheet lists LT800P for the LMXS30776 family and gives the 29.7-cu.-ft. four-door French-door, CustomChill, Door-in-Door and integrated water/ice configuration. This record is scoped only to the exact S SKU named by the support page.
- Listed replacement water-filter cartridge: LT800P.
Part purpose, identity and limits
The LT800P cartridge serves the refrigerator’s filtered-water/ice system for this model. LT800P is a genuine LG refrigerator water filter rated for up to six months or 200 gallons. LG’s model support page links the exact owner manual and filter compatibility item; confirm the complete model code before ordering.
Keep the water cartridge separate from any air/odor filter, bypass, head or manifold. Certification and reduction claims apply only to the manufacturer’s listed conditions and contaminants.
Safe next step
Check the full appliance label and current cartridge mark before ordering. Follow the exact model manual and the part-specific replacement guide for valve handling, installation, flush and filter-indicator reset.
Catch drips, do not force a cartridge that will not align, and inspect for leaks after replacement. Use only potable water within the published operating limits.