Water Filter for the LG LMX28988SW (LT700P)

LMX28988SW specifics — where the filter actually lives

Finding the bay is the easy part — this chassis puts it in the fresh-food compartment — exact spot varies by dispenser layout, a spot that survives trim changes across the LM run. The seat combines push-fit and twist-lock: the cartridge goes in square, then a short rotation locks it against the header — no tools involved.

The recurring owner notes: the reset control is the step everyone skips; the light will not acknowledge a new cartridge on its own. One prefix, one chassis family: LM machines come from the 4-door Max program, and LG’s parts system rewards you for knowing it: one cartridge family covers the run. Trailing letters like SW denote trim and finish: stainless, panel-ready, handle variants. The water path is identical across them.

LM vs LF — what the prefix tells you

LM versus LF is the first fork in the parts catalog: The 4-door Max/French-door split tracks the LM/LF prefixes — cartridge fit follows the water path, not the label on the door. Size class 28 cu ft — worth knowing because a full household works a cartridge harder than the rated six months assumes.

Swap it in 5 minutes

• Press the release (if fitted), twist the old cartridge free, and pull it from the header.
• Wet the new cartridge’s o-ring with cold tap water so it seats without dragging.
• Push the cartridge square onto the header, then give it the locking quarter turn.
• Run two gallons through the dispenser to flush carbon fines, then hold the filter-reset control until the status light clears.

What this filter takes out of your water

Coverage above lists what the standard addresses, not a performance claim for any specific cartridge — removal claims vary by certificate, so check the NSF listing for the exact part number you are buying.

LMX28988SW filter questions