LG WM3700HWA Washer Leaking? Find the Source Before Replacing a Part

A leaking LG WM3700HWA Washer does not automatically identify one failed part. The safest first step is to stop the cycle, keep water away from electrical connections, unplug the washer if it is safe to do so, and close the water-supply valves. Then determine whether the leak starts during filling, washing, spinning, or draining, and whether it appears at the front, rear, underneath, around the detergent drawer, or inside the cabinet.

Multiple components can create a similar puddle. A blocked or overflowing detergent dispenser may look like a cabinet leak. A damaged or obstructed door boot gasket may allow water to escape at the front. A washer outer tub gasket can be involved when water appears to come from deeper inside the machine. Inlet hoses, the drain hose, the drain filter area, and the household drain can also be responsible. Do not assume a replacement gasket is needed until the leak source has been located.

Where is the LG WM3700HWA washer leaking?

With the washer stopped and the floor made safe, inspect the visible areas without reaching into moving or energized components. Note the first place where water appears rather than only where it finally collects.

• At the detergent drawer: buildup, an obstructed dispenser path, or excessive detergent can cause water to overflow or escape during filling. Check whether the drawer is difficult to open, visibly dirty, or leaking during a second or third fill.
• At the door opening: inspect the door boot gasket for hair, clothing, debris, folds, or visible damage. A small obstruction can prevent a proper seal, while a torn or deteriorated gasket may need replacement.
• At the rear: check the inlet-hose connections, rubber washers, and visible hose surfaces. They should be dry and secure. Also inspect the drain hose for a crack, kink, poor placement, or water backing up from the household drain.
• Near the lower front area: if the drain filter or emergency drain hose has been used, verify that the filter cap and emergency drain-hose cap are fully closed. Residual water can also remain after cleaning.
• Underneath or inside the cabinet: an internal hose, seal, or tub-area problem may require service. Avoid dismantling the washer unless you are qualified to do so.

When does the leak happen during a cycle?

The operating stage can narrow the possibilities, but it does not prove which component has failed.

• During filling: look first at the detergent dispenser, inlet hoses, and visible connections. Excessive or unsuitable detergent may also contribute to overflow or oversudsing.
• During washing: inspect the door boot gasket and the area around the door. Confirm that no item is caught between the gasket and the door.
• During spinning: observe whether water appears from the front, rear, or beneath the cabinet. Stop the machine if the leak becomes substantial.
• During draining: inspect the drain hose, household drain, lower drain-filter area, and nearby caps. A household drain that cannot accept the discharge may overflow even when the washer itself is not the source.
• Only on certain cycles or temperatures: record the setting and timing. Intermittent leaks still require source identification before selecting a part.

Could the door boot gasket be causing the leak?

The door boot gasket, also called the door gasket or door boot seal, is one possible source when water escapes around the front of the LG WM3700HWA. With the washer unplugged, gently inspect the visible gasket surface and folds for debris, cuts, splits, or an item caught in the seal. Clean only what can be safely reached without damaging the rubber.

If the gasket is damaged or the leak continues after removing an obstruction, compare the model label and the part number carefully. The verified options for this model include MDS66290801, listed as a Washer Door Boot Gasket, and MDS65736915, listed as a Washer door gasket / door boot gasket seal. These are separate part numbers, so do not treat them as interchangeable without confirming your washer’s required number.

Could the outer tub gasket be involved?

If water appears to come from inside the cabinet or from beneath the washer rather than directly around the door, an outer tub gasket is another possible component. However, hoses, connections, and other internal areas can create a similar symptom. A visible puddle alone is not enough to confirm the outer tub gasket.

The verified LG WM3700HWA hub lists 4036ER4001F as the Washer outer tub gasket. Before ordering, read the appliance model label and compare the complete part number, including every letter and number. If the source cannot be safely observed or the leak is internal, professional diagnosis is recommended.

Which verified parts are available for the LG WM3700HWA?

After identifying the likely leak area, use the exact LG WM3700HWA Washer leaking parts hub to review the verified fitment options:

• 4036ER4001F — Washer outer tub gasket. Consider this only when the evidence points to the outer tub sealing area, and confirm the part number first.
• MDS66290801 — Washer Door Boot Gasket. This is one verified door-boot gasket option for the LG WM3700HWA.
• MDS65736915 — Washer door gasket / door boot gasket seal. Compare this number with the appliance label and the gasket being replaced.

These products are verified against the supplied LG WM3700HWA model hub, but fitment should still be confirmed before purchase. Model labels and part numbers can be misread, and similar-looking gasket names do not make two part numbers identical.

What should you check before ordering a replacement?

1. Stop the washer and make the area safe. Unplug it when appropriate and close the supply valves.
2. Identify the leak location and the cycle stage when it begins.
3. Check the detergent drawer, door boot, inlet hoses, drain hose, drain-filter area, and household drain for visible causes.
4. Do not operate the washer repeatedly to “test” a substantial leak or reach near energized components.
5. Read the full model label and compare the complete replacement part number: 4036ER4001F, MDS66290801, or MDS65736915, as applicable.
6. If water is coming from inside the cabinet, the gasket is difficult to access, or the leak remains after basic checks, contact a qualified appliance professional.

Frequently asked questions about an LG WM3700HWA washer leak

Can one symptom point to several parts?

Yes. A leak on the floor may originate at the dispenser, door boot gasket, outer tub area, inlet hose, drain hose, drain-filter area, or household drain.

Should I replace the door gasket immediately?

Not without checking the source. Inspect for debris and damage first, then confirm whether MDS66290801 or MDS65736915 matches the required part number.

What if the leak is underneath the LG WM3700HWA?

Stop using the washer until the source is identified. An underneath leak may involve an internal seal or hose, including the area associated with outer tub gasket 4036ER4001F, but it should not be diagnosed from location alone.

How do I confirm fitment?

Confirm the complete LG WM3700HWA model label and compare the exact part number before ordering. If the label or number is unclear, seek professional assistance.