LG WM4000HWA · User maintenance
Clean the hot and cold inlet screens
Isolate both water supplies, clean the removable inlet screens and verify their refitting before a fill check.
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
- Pliers for the removable inlet screens
- Bucket
- Soft cloth
Materials
- White vinegar OR a suitable lime-scale remover
- Clean rinse water
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.
Switch off and unplug the washer. Turn off both hot and cold faucets. Label the two hose connections before removal; if a valve cannot be closed, stop without loosening a hose.
Source: LG WM4000H*A / WM4080H*A Owner’s Manual · pp. 5, 12–13, 39At the accessible rear of the washer, unscrew the hot and cold hoses with a bucket and cloth ready for residual water. If water keeps flowing with the faucets closed, stop and obtain plumbing help.
Source: LG WM4000H*A / WM4080H*A Owner’s Manual · pp. 5, 12–13, 39Use pliers carefully to withdraw the removable screen from each inlet valve. Leave the valve body in place. Stop for a damaged, stuck or missing screen.
Source: LG WM4000H*A / WM4080H*A Owner’s Manual · pp. 5, 12–13, 39Remove loose debris. Soak screens in white vinegar OR lime-scale remover used according to its label. Rinse thoroughly and press both intact screens back into place.
Source: LG WM4000H*A / WM4080H*A Owner’s Manual · pp. 5, 12–13, 39Secure hose ends over a bucket or drain, then briefly open the supply faucets to flush several gallons through the hoses as the manual directs. Keep clear of hot discharge. Close both faucets again before reattaching hoses.
Source: LG WM4000H*A / WM4080H*A Owner’s Manual · pp. 5, 12–13, 39Check hose seals and reconnect hot to hot and cold to cold without cross-threading. With both screens fitted, open both faucets fully and check both ends for leaks. Close the faucets if leakage appears.
Source: LG WM4000H*A / WM4080H*A Owner’s Manual · pp. 5, 12–13, 39Only after dry hands, a dry floor and complete reassembly, reconnect power and observe the next fill. Record whether filling resumes or IE returns; the message alone does not identify a failed valve.
Source: LG WM4000H*A / WM4080H*A Owner’s Manual · pp. 5, 12–13, 39
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 “Is inlet-screen cleaning the next appropriate check?”. Choose only what you observed. An unobserved condition is its own answer.
Is inlet-screen cleaning the next appropriate check?
Is inlet-screen cleaning the next appropriate check?
Start with the external IE supply checks. Cleaning the screens is a separate user-maintenance operation; an error code alone cannot identify a blocked screen.
- Normal filling and no screen 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. - External checks are done and screen cleaning is planned
Continue to Are power unplugged and both hot and cold faucets closed?. - I have not checked the external supply 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. 39, 43
Are power unplugged and both hot and cold faucets closed?
Are power unplugged and both hot and cold faucets closed?
Rear connections must already be safely accessible. Identify hot and cold before removal. Do not loosen hoses if a faucet is stuck or isolation is uncertain.
Steps for this check: 1.
- Unplugged; both faucets closed; safe access confirmed
Continue to Have both hoses and removable screens come free safely?. - Isolation, access or a hose 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. - I have not completed isolation
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, 39
Have both hoses and removable screens come free safely?
Have both hoses and removable screens come free safely?
Contain residual water, unscrew the hoses and carefully withdraw the screens with pliers. Leave the inlet valve bodies in place.
- Both intact screens are removed and residual water is contained
Continue to Are both cleaned screens rinsed and back in their seats?. - Water continues, a screen is stuck or a part 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. - Removal 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. 39
Are both cleaned screens rinsed and back in their seats?
Are both cleaned screens rinsed and back in their seats?
Use vinegar OR label-directed descaler, rinse thoroughly and refit both screens. Never operate with a missing screen.
Steps for this check: 4.
- Both clean intact screens are back in place
Continue to Have the hoses been flushed and both faucets closed again?. - A screen is missing, damaged or will not seat
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. - Cleaning or refitting is incomplete
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. 39
Have the hoses been flushed and both faucets closed again?
Have the hoses been flushed and both faucets closed again?
Hold hose ends securely over a bucket or drain. Flush as the manual directs, avoid hot water, then close both faucets before reconnecting.
Steps for this check: 5.
- Flushing is complete and both faucets are closed
Continue to Are hot and cold reconnected correctly with no leaks?. - Flow cannot be safely controlled or contained
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. - Flushing 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 · pp. 12–13, 39
Are hot and cold reconnected correctly with no leaks?
Are hot and cold reconnected correctly with no leaks?
Check seals, avoid cross-threading, then open both faucets and check both hose ends. Keep power disconnected until reassembly and a dry area are confirmed.
Steps for this check: 6.
- Both screens fitted; connections match and stay dry
Continue to Did the next fill complete after restoring power?. - A fitting leaks, 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. - Reconnection or leak check is 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. 12–13, 39
Did the next fill complete after restoring power?
Did the next fill complete after restoring power?
Restore power only with dry hands, a dry floor and all parts assembled. Record IE separately from an actual observed fill.
Steps for this check: 7.
- Filling resumes and connections stay 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. - IE, poor filling or leakage persists
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. - The next fill has not been observed
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. 39, 43
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
- Both screens are present, hose connections remain dry and the next fill was observed.
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
Clean when needed; hard water can require more frequent cleaning. No fixed interval is specified.
LG WM4000H*A / WM4080H*A Owner’s Manual · p. 39
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, 12–13, 39
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.