Clean the hot and cold inlet screens
LG WM4000HWA
Region: US | Content version: 2.0.0

Isolate both water supplies, clean the removable inlet screens and verify their refitting before a fill check.

MODEL AND MANUAL
Exact model: WM4000HWA
Rinse+Spin button with Control Lock marking; Tub Clean cycle. Compare your supplied manual with MFL71728908 Rev.02_051022.
Manual: MFL71728908 Rev.02_051022
Excludes: WM3400CW; WM4000HBA; WM4080HWA; WM4000HWA with a different control panel or manual instructions

PREPARATION
[ ] Finish the cycle, switch off and unplug from a dry location. Close both hot and cold supply faucets before undoing a hose.
[ ] Proceed only if the rear connections are already safely accessible without moving or tilting the washer. Arrange qualified help for stuck valves, damaged hoses or uncertain isolation.
[ ] Use a bucket able to contain the flush water. Keep hot water away from skin and electrical parts. Never mix vinegar or descaler with bleach.

TOOLS
- Pliers for the removable inlet screens
- Bucket
- Soft cloth

MATERIALS
- White vinegar OR a suitable lime-scale remover
- Clean rinse water

FULL CHECKLIST
1. 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, 39
2. At 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, 39
3. Use 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, 39
4. Remove 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, 39
5. Secure 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, 39
6. Check 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, 39
7. Only 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

STOP CONDITIONS
- 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.

BRANCH CHECKS
Begin with: Is inlet-screen cleaning the next appropriate check?

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.

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.
Follow checklist steps: 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.

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.
Follow checklist steps: 2, 3
- 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.

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.
Follow checklist steps: 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.

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.
Follow checklist steps: 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.

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.
Follow checklist steps: 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.

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.
Follow checklist steps: 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.

RESULT OBSERVATIONS
- Both screens are present, hose connections remain dry and the next fill was observed.

YOUR RECORD
Observation date: ____________________

BEFORE
External fill checks and screen condition: ____________________

AFTER
Screen refit, hose check and fill result: ____________________

Additional observations: ____________________
Result / reason for stopping: ____________________
Next action: ____________________

REMINDER
Clean when needed; hard water can require more frequent cleaning. No fixed interval is specified.
Interval: Choose a personal interval; basis: user-selected
Source: lg-manual; p. 39
A calendar reminder is a personal plan, not a record of work completed.

DIAGRAMS
Hot and cold faucets and hoses, removable inlet screens, and the requirement to refit both screens
https://csl-13-appliance-repair.pages.dev/diagrams/lg-inlet-path.svg
Original Homekeep artwork. Conceptual component relationships, not a scale drawing or an installation template.

SOURCES
LG WM4000H*A / WM4080H*A Owner’s Manual | MFL71728908 Rev.02_051022 | pp. 5, 12–13, 39
https://media.us.lg.com/m/12df7154cf356724/original/WM4080_2023_Owners-Manual_Washer_Eng.pdf#page=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.
https://www.lg.com/us/support/product/lg-WM4000HWA.ABWEUUS
Checked: 2026-10-13. Link only

RELATED TASKS
Check an IE inlet error from outside: https://csl-13-appliance-repair.pages.dev/tasks/lg-ie-inlet/
Review inlet hose condition and age: https://csl-13-appliance-repair.pages.dev/tasks/lg-hose-condition/
Record external clues after a water leak: https://csl-13-appliance-repair.pages.dev/tasks/lg-leak-check/

Observations do not certify a physical repair. Follow your matching supplied manual and the stop conditions.
Guide: https://csl-13-appliance-repair.pages.dev/tasks/lg-inlet-filters/