The AS401WWA1 is an LG air purifier. Discontinued — LG’s own US product page flags this exact model discontinued (read 24 September 2026); it is out of production but not out of the field, and it is exactly the kind of model that has nowhere else to turn for support. The most common service call on this unit is: fan running while the air-quality indicator stays fixed on one reading.
Service calls on this air purifier most often trace to one of a short list: fan running while the air-quality indicator stays fixed on one reading, filter-change light staying lit after a genuine replacement filter is fitted, or fan not responding to the automatic speed setting. We confirm which one applies against the model and serial number before ordering a part.
Key Features
- Multi-stage filtration ahead of the fan assembly
- Electronic air-quality sensor driving automatic fan speed
Most Common Issues on This Model
Fan running while the air-quality indicator stays fixed on one reading
Filter-change light staying lit after a genuine replacement filter is fitted
Fan not responding to the automatic speed setting