Coway Airmega 400 how to adjust the pollution sensor sensitivity

When the pollution level stays Very unhealthy after more than two hours, or stays Good for more than an hour in a polluted environment.

Steps

1. Touch and hold the [Light] button together with the Smart mode icon (400S and 400) or the [Air speed/mode] button (300S and 300).
2. Pick the sensitivity: touch one of the air speeds (400S and 400), or touch the [Air speed/mode] button repeatedly (300S and 300). The choices are Sensitive, Normal and Less sensitive.
3. Touch and hold the same two controls again. A sound confirms that the setting is saved.

Source: Adjusting the Sensor Sensitivity Source: Adjusting the Sensor Sensitivity, p. 18

Used for

• The pollution level does not change

Other Airmega 400 procedures

• How to clean the pre-filtersWhen the [Pre Wash] indicator is lit, about every 2 weeks.
• How to replace the Max2 filtersWhen the [Max2 Change] indicator is lit, about every 12 months.
• How to clean the pollution sensorAbout every 2 months.

Sources

1. 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.

Applies to

AP-2015E (variant AP-2015E(SILVER_US)), AP-2015F (variant AP-2015F(SILVER_US)), AP-1515G, AP-1515H. United States.

Source

User Manual, Air Purifier 400S/400/300S/300 (English, French), 1216776 revision 003

Last verified

13 November 2026

Handbook

Coway Airmega 400S, 400, 300S and 300 air purifiers in Air purifiers; all Coway handbooks