{
  "id": "lg-mineral-buildup",
  "version": "2.0.0",
  "title": "Remove visible drum mineral buildup",
  "deviceFamily": "washer",
  "modelApplicability": {
    "modelIds": [
      "lg-wm4000hwa"
    ],
    "region": "US",
    "panel": "Rinse+Spin button with Control Lock marking; Tub Clean cycle. Compare your supplied manual with MFL71728908 Rev.02_051022.",
    "manualVersion": "MFL71728908 Rev.02_051022"
  },
  "exclusions": [
    "WM3400CW",
    "WM4000HBA",
    "WM4080HWA",
    "WM4000HWA with a different control panel or manual instructions"
  ],
  "intent": "maintenance",
  "summary": "Choose a washer-compatible descaler and finish the required cleaning and rinse sequence.",
  "prerequisites": [
    {
      "text": "Empty the drum; turn off and unplug for hands-on wiping.",
      "sourceId": "lg-manual",
      "locator": "pp. 5, 37–38"
    },
    {
      "text": "Read the cleaner label and avoid abrasive tools. Never mix cleaner products.",
      "sourceId": "lg-manual",
      "locator": "pp. 5, 37–38"
    },
    {
      "text": "Keep children and pets away during drying.",
      "sourceId": "lg-manual",
      "locator": "pp. 5, 37–38"
    }
  ],
  "tools": [
    "Soft cloth"
  ],
  "materials": [
    "Washer-compatible descaler or stainless steel cleaner as appropriate"
  ],
  "steps": [
    {
      "id": "step-1",
      "text": "For visible mineral spots on the stainless drum, use a soft cloth and suitable stainless steel cleaner; do not use steel wool.",
      "sourceId": "lg-manual",
      "locator": "pp. 5, 37–38"
    },
    {
      "id": "step-2",
      "text": "For scale, follow the washer-compatible descaler label for dose and placement. Do not guess a quantity or combine products.",
      "sourceId": "lg-manual",
      "locator": "pp. 5, 37–38"
    },
    {
      "id": "step-3",
      "text": "After descaling, with all parts assembled, restore power and run Tub Clean with no laundry before washing clothes.",
      "sourceId": "lg-manual",
      "locator": "pp. 5, 37–38"
    },
    {
      "id": "step-4",
      "text": "Use Rinse+Spin after a drum cleaner or descaler: Power on without choosing a cycle, press Rinse+Spin, then Start/Pause.",
      "sourceId": "lg-manual",
      "locator": "pp. 5, 37–38"
    },
    {
      "id": "step-5",
      "text": "After the rinse ends, inspect the drum and let it dry safely. If deposits persist, ask support about the water conditions.",
      "sourceId": "lg-manual",
      "locator": "pp. 5, 37–38"
    }
  ],
  "checks": [
    {
      "id": "deposit-location",
      "goal": "Are mineral-like deposits visible on the empty stainless drum?",
      "question": "Are mineral-like deposits visible on the empty stainless drum?",
      "instruction": "Unplug for hands-on wiping. Record the visible surface; do not open panels to look for internal scale.",
      "stepIds": [],
      "choices": [
        {
          "label": "No visible mineral deposit",
          "next": "identified",
          "observation": "normal"
        },
        {
          "label": "Visible spots or scale on the stainless drum",
          "next": "descaler-label",
          "observation": "abnormal"
        },
        {
          "label": "I have not checked this yet",
          "next": "ready",
          "observation": "unobserved"
        }
      ],
      "sourceId": "lg-manual",
      "locator": "pp. 5, 38"
    },
    {
      "id": "descaler-label",
      "goal": "Is a washer-compatible descaler and its dose confirmed?",
      "question": "Is a washer-compatible descaler and its dose confirmed?",
      "instruction": "Use a compatible product following its label. Do not mix cleaners or use steel wool. A suitable stainless steel cleaner and soft cloth may be used for surface spots.",
      "stepIds": [
        "step-1",
        "step-2"
      ],
      "choices": [
        {
          "label": "Compatible descaler, dose and placement are known",
          "next": "descale-finish",
          "observation": "normal"
        },
        {
          "label": "Product is incompatible or chemicals were mixed",
          "next": "service",
          "observation": "abnormal"
        },
        {
          "label": "I have not confirmed a suitable product",
          "next": "ready",
          "observation": "unobserved"
        }
      ],
      "sourceId": "lg-manual",
      "locator": "pp. 5, 38"
    },
    {
      "id": "descale-finish",
      "goal": "Is descaling complete and the washer fully assembled?",
      "question": "Is descaling complete and the washer fully assembled?",
      "instruction": "Follow the product directions completely. Keep the drum empty and leave any required contact time to the product label.",
      "stepIds": [
        "step-2"
      ],
      "choices": [
        {
          "label": "Descaling is complete; ready for empty Tub Clean",
          "next": "descale-tub",
          "observation": "normal"
        },
        {
          "label": "Leakage, damage or an unexpected reaction appeared",
          "next": "service",
          "observation": "abnormal"
        },
        {
          "label": "Descaling is incomplete",
          "next": "ready",
          "observation": "unobserved"
        }
      ],
      "sourceId": "lg-manual",
      "locator": "pp. 5, 38"
    },
    {
      "id": "descale-tub",
      "goal": "Did the empty Tub Clean cycle finish after descaling?",
      "question": "Did the empty Tub Clean cycle finish after descaling?",
      "instruction": "Restore power only after hands-on work is finished and the area is dry. Run Tub Clean before washing clothes.",
      "stepIds": [
        "step-3"
      ],
      "choices": [
        {
          "label": "Tub Clean finished",
          "next": "descale-rinse",
          "observation": "normal"
        },
        {
          "label": "The cleaning cycle failed or a leak appeared",
          "next": "service",
          "observation": "abnormal"
        },
        {
          "label": "Tub Clean is still pending",
          "next": "ready",
          "observation": "unobserved"
        }
      ],
      "sourceId": "lg-manual",
      "locator": "pp. 37–38"
    },
    {
      "id": "descale-rinse",
      "goal": "Did Rinse+Spin finish with no cleaner residue visible?",
      "question": "Did Rinse+Spin finish with no cleaner residue visible?",
      "instruction": "Power on without selecting a wash cycle, press Rinse+Spin and Start/Pause. Inspect after motion stops and dry safely.",
      "stepIds": [
        "step-4",
        "step-5"
      ],
      "choices": [
        {
          "label": "Rinse completed; visible deposits and residue cleared",
          "next": "done",
          "observation": "normal"
        },
        {
          "label": "Deposits remain after the completed rinse",
          "next": "identified",
          "observation": "abnormal"
        },
        {
          "label": "Rinse fails or there is leakage",
          "next": "service",
          "observation": "abnormal"
        },
        {
          "label": "The rinse or inspection is pending",
          "next": "ready",
          "observation": "unobserved"
        }
      ],
      "sourceId": "lg-manual",
      "locator": "pp. 31, 38"
    }
  ],
  "branches": {
    "entry": "deposit-location",
    "outcomes": {
      "done": {
        "title": "Result recorded",
        "text": "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.",
        "type": "user-maintenance"
      },
      "identified": {
        "title": "Next action recorded",
        "text": "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.",
        "type": "issue-located"
      },
      "service": {
        "type": "service-needed",
        "title": "Pause and arrange qualified help",
        "text": "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."
      },
      "ready": {
        "title": "Observation still needed",
        "text": "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.",
        "type": "prepared"
      }
    }
  },
  "outcomeChecks": [
    {
      "text": "The drum was inspected after cleaning and rinsing; no cleaner residue remains",
      "sourceId": "lg-manual",
      "locator": "pp. 5, 37–38"
    }
  ],
  "stopConditions": [
    "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."
  ],
  "sources": [
    {
      "id": "lg-manual",
      "title": "LG WM4000H*A / WM4080H*A Owner’s Manual",
      "url": "https://media.us.lg.com/m/12df7154cf356724/original/WM4080_2023_Owners-Manual_Washer_Eng.pdf",
      "version": "MFL71728908 Rev.02_051022",
      "checkedAt": "2026-10-13",
      "purpose": "User maintenance, control operations, observable troubleshooting and safety",
      "reuse": "Copyright LG. Linked reference; original summaries only. No manual illustrations reproduced.",
      "locator": "pp. 5, 37–38",
      "topicPage": 38,
      "pdfPage": 38,
      "pageNumbering": "PDF page number equals printed English page number in these editions."
    },
    {
      "id": "lg-support",
      "title": "LG WM4000HWA product support",
      "url": "https://www.lg.com/us/support/product/lg-WM4000HWA.ABWEUUS",
      "version": "Live US model support page",
      "checkedAt": "2026-10-13",
      "purpose": "US model identity; newer revisions require comparison to supplied manual",
      "reuse": "Link only",
      "locator": "US WM4000HWA identity. Current support listings may contain a newer manual; these steps require MFL71728908 Rev.02_051022."
    }
  ],
  "assets": [
    {
      "id": "lg-drum-care",
      "url": "/diagrams/lg-drum-care.svg",
      "kind": "original schematic",
      "alt": "Visible drum deposits compared with an inspected drum after an empty cleaning and rinse sequence",
      "license": "Original Homekeep artwork. Conceptual component relationships, not a scale drawing or an installation template.",
      "sourceId": "lg-manual",
      "locator": "pp. 5, 37–38"
    }
  ],
  "relatedIds": [
    "lg-tub-clean"
  ],
  "family": "care",
  "diagramId": "lg-drum-care",
  "recordFields": [
    {
      "key": "before-observation",
      "label": "Drum deposit appearance",
      "phase": "before",
      "type": "text",
      "placeholder": "Location, color and visible amount"
    },
    {
      "key": "after-observation",
      "label": "Product and result after cleaning and rinsing",
      "phase": "after",
      "type": "text",
      "placeholder": "Cleaner used; rinse completed; remaining deposits"
    }
  ],
  "maintenance": {
    "intervalDays": null,
    "basis": "user-selected",
    "label": "Inspect according to visible deposits and water conditions; the manual gives no fixed descaling interval.",
    "sourceId": "lg-manual",
    "locator": "p. 38"
  }
}