LG WM3900 Front Load Washer — Issues & Fixes

Front-load washers put their wear around the suspension, the drain path, and the door seal, and the WM3900 follows that pattern, led by the UE unbalance fault. Most of its repairs are inexpensive parts with clear symptoms. Below are the covered models, the ranked problems with the part behind each, the codes it reports, and a repair-or-replace framework.

Model Specifications#

Both variants share one platform and parts catalog. The line features TurboWash for faster deep cleaning on a front-load design.

Common Problems for This Model#

Ranked by field frequency, each with the part behind it:

1. UE unbalance error (30%) — the load will not balance during spin. Worn shock absorbers (4901ER2003A, sold as a set of two) are the usual root cause.
2. Drain pump clogged, shown as OE (25%) — water will not clear. The drain pump (4681EA2001T) is cleared of debris or replaced.
3. Door boot gasket mold and odor (20%) — mold grows in the trapped folds. The door boot seal (MDS47123604) is cleaned or replaced, and a dry gasket prevents a repeat.
4. Bearing failure (15%) — a loud rumble during spin. The bearing and seal kit (4036ER2004A with MAP61913707) is the fix.
5. TurboWash spray nozzle clogged (10%) — the spray weakens. The TurboWash nozzle assembly (AJU75152603) is cleared or replaced.

Error Codes#

The WM3900 can display any of these codes:

• UE
• OE
• DE
• LE
• PE

For a code outside this list, unplug the washer or flip the breaker for 60 seconds and restore power to clear transient faults. A code that returns immediately needs a proper diagnosis.

Parts That Commonly Fail#

Match each number to your exact model before ordering:

Recall Status#

There are no active recalls on the LG WM3900 series as of 2026-05-28. Because a recall can be issued at any time, check the Consumer Product Safety Commission at cpsc.gov with your model number and sign up for their email alerts.

Repair or Replace?#

Weigh the age of the unit, the cost of the fix, and its cumulative history. Under 10 years old with a repair below 50% of a comparable new washer, repair is the better value, and drain pump and gasket jobs are inexpensive at any age. A bearing replacement is worthwhile under 10 years but is the one repair that approaches the cost line; a combined bearing and tub-seal failure on an older unit tips toward replacement. After 10 years, once the last two to three years of repairs clear 40% of replacement cost, a new washer makes more sense.

Maintenance That Prevents These Failures#

• Run the Tub Clean cycle monthly; the washer will remind you.
• Clean the drain pump filter trap monthly from the front access panel.
• Leave the door ajar after every load so the drum and gasket dry out.
• Wipe the door boot gasket fold after each wash, since mold grows in trapped moisture.

Redistributing loads and not overpacking the drum also cuts down on the UE unbalance faults that lead this washer's repair list.

A useful way to read the WM3900's repair list: the top three faults — a UE unbalance, an OE drain clog, and a moldy door boot — are all inexpensive and largely preventable maintenance items, while only the bearing job approaches the cost line. Keeping the drain filter clean and the gasket dry heads off most of what brings this washer in for service.