Coway airmega 400 filter replacement
When the [Max2 Change] indicator is lit, about every 12 months.
Steps
- Unplug the air purifier.
- Remove the covers and filters on both sides in this order: covers, pre-filters, Max2 filters.
CAUTION
When removing the plastic wrapping from the filters, be careful not to damage the surface of filters.
Marked CAUTION by the manufacturer Source: How to replace the Max2 Filter, p. 21
CAUTION
Do not allow children to play with the plastic wrapping.
Marked CAUTION by the manufacturer Source: How to replace the Max2 Filter, p. 21
- Remove the plastic wrapping from the new Max2 filters and discard it. The old Max2 filters cannot be reused.
- Return the filters and covers in reverse order: Max2 filters, pre-filters, covers. Put each Max2 filter in its case with the green side facing the product.
- Touch and hold the [Max2 Change] button to reset the filter indicator.
The product does not turn on if the right and left covers are installed incorrectly. Reversed placement may affect the filter lifetime.
Source: How to replace the Max2 Filter Source: How to replace the Max2 Filter, p. 21
Used for
- [Max2 Change] indicator: The Max2 filters need replacing. On the 400S and 400 the button also shows the filter life in levels from 100% down to 0%.
- A bad smell comes out from the air outlet
Other Airmega 400 procedures
- How to clean the pre-filtersWhen the [Pre Wash] indicator is lit, about every 2 weeks.
- How to clean the pollution sensorAbout every 2 months.
- How to adjust the pollution sensor sensitivityWhen the pollution level stays Very unhealthy after more than two hours, or stays Good for more than an hour in a polluted environment.
Sources
- User Manual, Air Purifier 400S/400/300S/300 (English, French). Coway. Document 1216776, revision 003, 88 pages, en-US. cowaymega.com. Listed on the manufacturer's support page. Retrieved 13 November 2026.
Page numbers are the numbers printed in the manual. Where this page and the manual differ, follow the manual.