Coway Airmega 400S, 400, 300S and 300 air purifiers

Category: Air purifiers
Model number: AP-2015E, AP-2015E(SILVER_US), AP-2015F, AP-2015F(SILVER_US), AP-1515G, AP-1515H
Region: United States
Manual: 1216776 revision 003
Verified: 13 November 2026

Filter codes, problems and how-tos

Indicator lights

Indicator	Meaning	Checks
[Pre Wash] indicator	The pre-filters need cleaning. On the 400S and 400 the button also shows the pre-filter cleaning cycle in levels from 100% down to 0%.	2 causes
[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%.	2 causes
Wi-Fi indicator	Wi-Fi connection state of the Airmega 400S and 300S.	Checks
Air quality indicator colour	Pollution level around the purifier. 400S and 300S: blue and green is Good, green and yellow Moderate, yellow and pink Unhealthy, pink and red Very Unhealthy. 400 and 300: blue is Good, purple Moderate, pink Unhealthy, red Very Unhealthy.	Checks

Coway codes on other models

Wi-Fi indicator

The [Wi-Fi] indicator on the 400S or 300S blinks, stays lit or is off. Wi-Fi connection state of the Airmega 400S and 300S.

Blinking: not connected yet or in the pairing process. Source: Checking the product; Connecting the Air Purifier to the Wi-Fi Network, pp. 4, 10

Pair the purifier in the Airmega application using the app pairing guide Coway links in the manual.

Constant: Wi-Fi is connected. Source: Checking the product, p. 10

Off: Wi-Fi is off. Touch the [Wi-Fi] button to connect to a Wi-Fi network. Source: Checking the product, p. 10

Touch the [Wi-Fi] button.

Air quality indicator colour

The air quality indicator colour changes. Pollution level around the purifier. 400S and 300S: blue and green is Good, green and yellow Moderate, yellow and pink Unhealthy, pink and red Very Unhealthy. 400 and 300: blue is Good, purple Moderate, pink Unhealthy, red Very Unhealthy.

Source Source: Checking the Air Quality, p. 18

Problems

No air comes out from the air outlet4 causes in the manual. First: the power plug is not connected.
Air speed from the air outlet is significantly lowThe filter cleaning or replacement cycle has passed.
The pollution level does not change2 causes in the manual. First: the lens of the pollution sensor is dirty.
A bad smell comes out from the air outletThe filter cleaning or replacement cycle has passed.

Air speed from the air outlet is significantly low

The filter cleaning or replacement cycle has passed. Source: Troubleshooting, p. 25

Clean the pre-filters or replace the Max2 filters if necessary. See Clean the pre-filters.

A bad smell comes out from the air outlet

The filter cleaning or replacement cycle has passed. Source: Troubleshooting, p. 25

Clean the pre-filters or replace the Max2 filters if necessary. See Replace the Max2 filters.

How-to

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.
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.

Maintenance

Task	When	Source
Clean the pre-filters whenever the [Pre Wash] indicator is lit	About 2 weeks at 8 hours a day at maximum speed	Source: Filter Maintenance and Cleaning Parts, p. 19
Replace the Max2 filters whenever the [Max2 Change] indicator is lit	About 12 months at 8 hours a day at maximum speed	Source: Filter Maintenance and Cleaning Parts, p. 19
Clean the front, left and right covers, the air outlet and the pollution sensor	Every 2 months (recommended)	Source: Filter Maintenance and Cleaning Parts, p. 19
Wipe the exterior with a soft dry cloth, or a slightly damp cloth when dirty		Source: Filter Maintenance and Cleaning Parts, p. 19

Settings

Setting	Options	Notes	Source
Smart mode: Auto, Sleep and ECO	400S and 400: touch the sensor for Smart. 300S and 300: touch the [Air speed/mode] button repeatedly until Smart is selected	Sleep mode starts when the room is dark and air quality is Good for 3 minutes. ECO stops the fan after the air stays Good for more than 10 minutes and restarts it when pollution is detected, or after 30 minutes.	Source: Smart Mode - Auto; Smart Mode - ECO, pp. 16–17
Timer	1 hour, 4 hours or 8 hours on the 400 and 300; set in the Airmega app on the 400S and 300S	Turns the purifier off after the chosen time.	Source: Setting the Timer, p. 17
Light button	Touch the [Light] button	Turns the air quality indicator and light on or off.	Source: Checking the product, p. 10
Power	Touch [Power] to turn on; touch and hold for 2 to 3 seconds to turn off		Source: Checking the product, p. 11

Parts and consumables

Item	Replace or refill	Specification	Source
Max2 filter set	About 12 months at 8 hours a day at maximum speed	Activated carbon filter plus Green True HEPA filter, one on each side. Not reusable; do not wash with water. Use Airmega genuine filters.	Source: Filter Maintenance and Cleaning Parts; Specification, pp. 19, 26
Pre-filter	Clean about every 2 weeks at 8 hours a day at maximum speed	Washable; one on each side.	Source: Filter Maintenance and Cleaning Parts; Pre-filter; Specification, pp. 19–20, 26

Specifications

One manual covers the Airmega 400S (AP-2015E), 400 (AP-2015F), 300S (AP-1515G) and 300 (AP-1515H). The S models connect to Wi-Fi and the Airmega app. Source: Specification; Checking the product, pp. 10, 26

The [Pre Wash] and [Max2 Change] indicators on the control panel are the filter lights. [Pre Wash] means clean the pre-filters, about every 2 weeks; [Max2 Change] means replace the Max2 filters, about every 12 months, both at 8 hours a day at maximum speed. Source: Checking the product; Filter Maintenance and Cleaning Parts, pp. 10, 19

In Smart mode the air speed follows the air quality: level 1 for Good, level 2 for Moderate or unhealthy, level 3 for very unhealthy. Source: Smart Mode - Auto, p. 16

Electrical, 400S and 400	120 V~ 60 Hz, 66 W	Source: Specification, p. 26
Electrical, 300S and 300	120 V~ 60 Hz, 57 W	Source: Specification, p. 26
Size (H × W × D), 400S and 400	22.8 × 14.8 × 14.8 in (58.0 × 37.6 × 37.6 cm)	Source: Specification, p. 26
Size (H × W × D), 300S and 300	20.1 × 13.6 × 13.6 in (53.2 × 34.5 × 34.5 cm)	Source: Specification, p. 26
Weight	400S and 400: 24.7 lb (11.2 kg). 300S and 300: 21.4 lb (9.7 kg)	Source: Specification, p. 26
Coverage, 400S and 400	1,560 ft² (145 m²) at two air changes per hour; 780 ft² (72 m²) when the area is cleaned once every 15 minutes	Source: Specification, p. 26
Coverage, 300S and 300	1,256 ft² (117 m²) at two air changes per hour; 628 ft² (58 m²) when the area is cleaned once every 15 minutes	Source: Specification, p. 26
Filters	Washable pre-filter and Max2 filter set (activated carbon and Green True HEPA), one set on each side	Source: Specification, p. 26

Recalls

No exact-model match for AP-2015E, AP-2015F, AP-1515G, AP-1515H in the U.S. Consumer Product Safety Commission recall database, checked 13 November 2026. Recalls can name model families, so also check current recalls for Coway.

Service contact

Coway customer service: 1-800-285-0982, cowaymega.com. United States (warranty service, 8:00 am to 5:00 pm PT, Monday to Friday). Source: Limited Warranty, p. 28

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.

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

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