WM3900HBA is LG’s model number for this front-load washer. LG’s own US product page still carries this model with an active status flag, read 24 September 2026. On this platform, the UE fault code is one of the more common reasons it gets a service call.
Service calls on this washer most often trace to one of a short list: the UE, dE or FE fault codes. We confirm which one applies against the model and serial number before ordering a part.
Key Features
- Direct Drive motor rather than a belt-driven transmission
- Load-sensing spin control
- Front-load washer
- Sold in 2 finish options on this platform
- Rated at 4.5 cu. ft.
Most Common Issues on This Model
01
UE fault code — unbalanced load detected at spin, most often a bunched or lopsided wash
02
dE fault code — door not confirmed shut, or the door latch assembly has failed
03
FE fault code — overfilling, most often traced to the water inlet valve