LG LMX25981ST/03 refrigerator Parts

For LG refrigerators like model LMX25981ST, the most common service issue we see is cooling trouble (refrigerator or freezer not staying cold). In many cases, the root cause is in the sealed cooling system or compressor circuit; other frequent causes are airflow, defrost, and ice maker or water system problems.

Most common symptoms customers notice

• Fresh food section warms up while the freezer seems “okay”
• Freezer warms up and ice production slows or stops
• Clicking, humming, or unusually loud running sounds
• Frost buildup on the back wall of the freezer
• Water under the refrigerator or inside the crisper area

What to check first (fast triage)

Start with the simple, high-impact checks before assuming a major failure:

• Confirm the temperature settings and give the unit 24 hours to stabilize
• Make sure vents are not blocked by food packages
• Clean dust from the condenser area (restricted airflow raises temps)
• Check door closing and gasket sealing (paper-strip test around the perimeter)
• If you have an ice maker or dispenser issue, replace the water filter and purge air

Common causes and the parts that often relate

Problem area	What it affects	Example related part for LMX25981ST
Airflow in freezer	Warm temps, uneven cooling	LG refrigerator evaporator fan motor 4681JB1027C
Defrost system	Frost buildup, warm freezer	LG refrigerator defrost heater 5300JK1005D
Water supply to ice/dispenser	No ice, slow water, leaks	LG refrigerator water inlet valve MJX41178908
Door sensing	Lights, fan behavior, alarms	Refrigerator door switch 6600JB1010A

Why it matters

Cooling problems can look the same from the outside, but the fix ranges from basic maintenance (airflow, filter, door seal) to component replacement (fan motor, defrost heater, inlet valve). Doing the quick checks first helps you avoid replacing the wrong part.

Helpful model-specific resources

• Use the LMX25981ST manual for temperature setting guidance, control features, and basic troubleshooting steps.
• For dispenser and filter-related issues, follow how to replace the water filter in an LG refrigerator.

Last updated: January 2026

On the LG LMX25981ST, leaking from the bottom is most often caused by a clogged or frozen defrost drain; defrost water cannot flow to the drain pan, so it overflows and runs down to the base of the refrigerator or onto the floor.

Most common causes (and what they look like)

• Clogged defrost drain: Water collects under crisper drawers or you see a puddle at the front.
• Frozen drain tube: Leak appears after heavy frost or after the doors were left open.
• Cracked or loose drain tube: Water drips near the rear bottom area (inside or behind the unit).
• Water supply leak (dispenser/ice maker models): Puddle forms even when the unit is not defrosting.
• Door not sealing well: Excess frost leads to more defrost water and overflow.

Quick checks you can do safely

1. Unplug the refrigerator and protect the floor with towels.
2. Pull out the lower bins and look for standing water under the crispers.
3. Check the freezer floor for a sheet of ice (a strong clue the drain is frozen).
4. Inspect the water line area and connections; if you see wet tubing, focus on the supply side.
5. Clean the condenser area and confirm the unit is level; poor airflow can increase frost and defrost load.

How we fix a clogged or frozen defrost drain

We typically clear the drain using warm water and gentle cleaning so water can reach the drain pan again.

• Flush the drain opening with warm (not boiling) water.
• Use a flexible plastic tube, zip tie, or pipe cleaner to remove sludge.
• If the drain is frozen, thaw the ice with warm water and time; avoid sharp tools.
• If the drain tube is damaged, replace it with the correct part for this model.

Helpful parts for this symptom

Symptom	Likely area	Model-matched part to consider
Water under drawers, puddle at front	Defrost drain path	Refrigerator drain tube 5251JA3003D
Puddle near water line area	Water supply circuit	LG refrigerator water inlet valve MJX41178908

Why it matters

A recurring bottom leak can lead to ice buildup, odors, and floor damage. Restoring proper defrost drainage helps the LG LMX25981ST run efficiently and prevents repeat puddles.

Reference guides

• Use the LMX25981ST manual for access steps and component locations.
• For step-by-step troubleshooting, follow how to get rid of refrigerator puddles.

Last updated: January 2026

Light frost in the freezer drawer of your LG LMX25981ST is usually caused by warm, moist air getting into the compartment, then freezing on cold surfaces. This often happens from frequent door openings, a drawer not fully closing, or a door gasket that is not sealing evenly.

Quick checks that fix most frosting

• Make sure the freezer drawer closes completely and is not blocked by packages or an overfilled bin.
• Check the door gasket for gaps, tears, or areas that look flattened.
• Wipe away moisture and frost, then monitor for 24 to 48 hours after improving the seal.
• Confirm the refrigerator is level so the doors naturally swing shut.
• Avoid leaving the drawer open while loading groceries.

Most common causes (and what to do)

What you notice	Likely cause	What we recommend
Frost mainly near the top/edges of the drawer	Air leak at gasket or drawer not fully shut	Clean gasket, warm it with a hair dryer on low to reshape, reduce overpacking
Heavy frost buildup over time	Door left ajar or frequent openings	Verify closure, limit open time, organize items for quick access
Frost plus water/ice at the bottom	Defrost drain issue	Clear ice, check the drain path and drain tube
Frost plus warm temps or poor airflow	Fan/defrost system issue	Check for blocked vents; inspect evaporator fan operation

Parts that commonly relate to frosting symptoms

If you find a sealing problem or airflow issue, these model-matched parts are often involved:

• Refrigerator door gasket ADX73730402 (torn, warped, or not sealing)
• Refrigerator drain tube 5251JA3003D (ice blockage can lead to water and refreezing)
• LG refrigerator evaporator fan motor 4681JB1027C (weak airflow can worsen frost patterns)

Why it matters

Frost buildup reduces airflow and insulation efficiency, which can cause longer run times, temperature swings, and ice clumps that keep the drawer from closing tightly. Fixing the air leak early prevents repeat frosting.

Model-specific reference

For the correct temperature settings, leveling guidance, and door sealing checks for LG LMX25981ST, follow the steps in the LMX25981ST manual.

Last updated: January 2026