LG WM4000HWA · User maintenance
Clean the drain pump filter
Drain residual water before opening the filter, then clean and refit the user-accessible parts.
01 / Match your appliance
Confirm your model and manual
Rinse+Spin button with Control Lock marking; Tub Clean cycle. Compare your supplied manual with MFL71728908 Rev.02_051022.
Covered manual: MFL71728908 Rev.02_051022. Excludes WM3400CW; WM4000HBA; WM4080HWA; WM4000HWA with a different control panel or manual instructions.
02 / Get ready
Preparation
Confirm each item before you follow the guided checks.
Tools
- Shallow container
- Bucket
- Soft cloth
Materials
- Water for cleaning
03 / Follow what you observe
Your next check
Confirm your model, panel, manual and preparation to begin.
The full checklist
Read the sequence before starting. Follow each step only when its preparation and branch conditions are met.
Open the small drain-filter access cover. Place the container at the emergency drain hose.
Source: LG WM4000H*A / WM4080H*A Owner’s Manual · pp. 5–6, 40Unclip the small drain hose and remove its plug. Collect the residual water; empty the container as needed. Do not open the filter while water remains uncontained.
Source: LG WM4000H*A / WM4080H*A Owner’s Manual · pp. 5–6, 40Turn the filter counterclockwise to remove it. Clear accessible debris from the filter and its opening; do not reach into the pump mechanism.
Source: LG WM4000H*A / WM4080H*A Owner’s Manual · pp. 5–6, 40Replace the small hose plug and secure the hose in its clip. Insert the filter and turn it clockwise to seat it.
Source: LG WM4000H*A / WM4080H*A Owner’s Manual · pp. 5–6, 40Close the access cover. Only after reassembly, dry floor and hands, restore power and observe a normal drain for leakage. Stop if water escapes.
Source: LG WM4000H*A / WM4080H*A Owner’s Manual · pp. 5–6, 40
When to stop
- Smoke, a burning smell, damaged wiring, standing water near power, or an active leak: stop using the appliance. Disconnect power only from a safe, dry location and arrange qualified service.
- Stop if a part is damaged, jammed, sharp, inaccessible, or does not match your manual. Do not force parts or remove a cabinet panel.
Every check and possible next step
Start at “What prompted the drain-filter check?”. Choose only what you observed. An unobserved condition is its own answer.
What prompted the drain-filter check?
What prompted the drain-filter check?
Use the last drain observation or your chosen periodic cleaning reminder. Stop for an active leak or unsafe water near power.
- No drainage symptom and no cleaning planned
Next action recorded — The observed condition does not call for further action in this task, or a different task is more appropriate. Keep the observation in your record; do not infer a failed component. - Slow drainage or filter cleaning is planned
Continue to Is the washer unplugged and the drain water cool?. - I have not checked this yet
Observation still needed — Your notes are saved. The missing observation is not evidence of a fault or a completed action. Complete only the steps you can perform safely, or ask for help.
LG WM4000H*A / WM4080H*A Owner’s Manual · pp. 5–6, 40
Is the washer unplugged and the drain water cool?
Is the washer unplugged and the drain water cool?
Finish or stop the cycle, wait for motion to stop and allow hot water to cool. Have a shallow container ready before opening the small access cover.
Steps for this check: 1.
- Unplugged, cool and ready to contain water
Continue to Has residual water drained through the small hose?. - Water is escaping or the area is unsafe
Pause and arrange qualified help — Keep the appliance out of use if a safety concern remains. Give the technician the exact model, the visible symptom and any displayed code. Do not open the cabinet or make electrical measurements. - Cooling or unplugging is still pending
Observation still needed — Your notes are saved. The missing observation is not evidence of a fault or a completed action. Complete only the steps you can perform safely, or ask for help.
LG WM4000H*A / WM4080H*A Owner’s Manual · pp. 5–6, 40
Has residual water drained through the small hose?
Has residual water drained through the small hose?
Drain into the container before loosening the large filter. Replug the small hose when emptying the container; repeat until the residual flow stops.
Steps for this check: 2.
- Residual water is contained and flow has stopped
Continue to Can the filter be removed and cleaned without damage?. - I cannot contain the flow or drain safely
Pause and arrange qualified help — Keep the appliance out of use if a safety concern remains. Give the technician the exact model, the visible symptom and any displayed code. Do not open the cabinet or make electrical measurements. - I have not drained the residual water
Observation still needed — Your notes are saved. The missing observation is not evidence of a fault or a completed action. Complete only the steps you can perform safely, or ask for help.
LG WM4000H*A / WM4080H*A Owner’s Manual · p. 40
Can the filter be removed and cleaned without damage?
Can the filter be removed and cleaned without damage?
Turn counterclockwise only after residual drainage. Clear accessible debris; keep fingers and tools out of the pump mechanism.
Steps for this check: 3.
- Filter and opening are clear and intact
Continue to Are the hose plug, hose clip and filter all secure?. - Filter is stuck, damaged or unsafe to handle
Pause and arrange qualified help — Keep the appliance out of use if a safety concern remains. Give the technician the exact model, the visible symptom and any displayed code. Do not open the cabinet or make electrical measurements. - I have not checked this yet
Observation still needed — Your notes are saved. The missing observation is not evidence of a fault or a completed action. Complete only the steps you can perform safely, or ask for help.
LG WM4000H*A / WM4080H*A Owner’s Manual · p. 40
Are the hose plug, hose clip and filter all secure?
Are the hose plug, hose clip and filter all secure?
Refit the small hose plug, clip the hose, seat the filter clockwise and close the cover before restoring power.
Steps for this check: 4.
- All user-accessible parts are secure
Continue to What happened on the next normal drain?. - A part will not seat or is damaged
Pause and arrange qualified help — Keep the appliance out of use if a safety concern remains. Give the technician the exact model, the visible symptom and any displayed code. Do not open the cabinet or make electrical measurements. - Reassembly is not complete
Observation still needed — Your notes are saved. The missing observation is not evidence of a fault or a completed action. Complete only the steps you can perform safely, or ask for help.
LG WM4000H*A / WM4080H*A Owner’s Manual · p. 40
What happened on the next normal drain?
What happened on the next normal drain?
Observe only with the washer fully assembled, dry hands and a dry floor. Stop immediately for leakage.
Steps for this check: 5.
- Drain completed and the filter area stayed dry
Result recorded — You recorded the task result from your own observation. Keep the before and after notes and recheck during normal use. This record does not certify the appliance condition. - Drainage is still poor or water escapes
Pause and arrange qualified help — Keep the appliance out of use if a safety concern remains. Give the technician the exact model, the visible symptom and any displayed code. Do not open the cabinet or make electrical measurements. - I have not observed another drain
Observation still needed — Your notes are saved. The missing observation is not evidence of a fault or a completed action. Complete only the steps you can perform safely, or ask for help.
LG WM4000H*A / WM4080H*A Owner’s Manual · pp. 40, 44
Possible results
Result recorded
You recorded the task result from your own observation. Keep the before and after notes and recheck during normal use. This record does not certify the appliance condition.
Next action recorded
The observed condition does not call for further action in this task, or a different task is more appropriate. Keep the observation in your record; do not infer a failed component.
Pause and arrange qualified help
Keep the appliance out of use if a safety concern remains. Give the technician the exact model, the visible symptom and any displayed code. Do not open the cabinet or make electrical measurements.
Observation still needed
Your notes are saved. The missing observation is not evidence of a fault or a completed action. Complete only the steps you can perform safely, or ask for help.
Check the result
- Water drains and the refitted filter and hose plug do not leak
A record you can return to
Your observations
Record what you saw before and after. Leave a field blank when you have not checked it. These entries stay in this browser.
Current result
No result recorded.
Summary to share with support
Review this summary before sharing it. A saved observation does not confirm a physical repair.
No observations recorded yet. Complete the checks or add the information you can safely observe.
Previous records on this browser
- No previous records saved.
Plan the next reminder
Periodic cleaning; choose a reminder based on use. The manual gives no fixed interval.
LG WM4000H*A / WM4080H*A Owner’s Manual · p. 40
No fixed manufacturer interval is supplied for this task. Choose a personal review interval if useful. A calendar reminder is a personal plan; it does not mark any work as completed.
Sources and fit
- LG WM4000H*A / WM4080H*A Owner’s Manual — MFL71728908 Rev.02_051022, pp. 5–6, 40
Checked 2026-10-13. Copyright LG. Linked reference; original summaries only. No manual illustrations reproduced.
- LG WM4000HWA product support — Live US model support page, US WM4000HWA identity. Current support listings may contain a newer manual; these steps require MFL71728908 Rev.02_051022.
Checked 2026-10-13. Link only
This independent checklist summarizes the listed references. Use your appliance’s supplied manual if it differs.