Skip to Contents Skip to Accessibility Help
Close

Help Library

Find help information for your LG product

Select a product category and then pick a topic or search a keyword.

Getting to Know your Air Purifier - AS401VGA1

Operation Air Care Solutions Last Updated 07/30/2016

Please see below a summary of the control panel and display, operation of the unit, maintenance of the unit and installation tips.


Start/Stop button Starts and stops the product.
Speed button Adjusts the fan volume.
Turbo button Cleans indoor air faster for 30 minutes.
Indicator button Toggles between PM density results for different dust particle sizes.
Off Timer button Sets the appliance to sleep mode and automatically turns it off after the selected amount of time.
Filter Reset function After replacing the filter, reset the Filter Life light by pressing and holding the Speed and Turbo buttons at the same time for three seconds.
Lock function Enable or disable by pressing and holding the Indicator and Off Timer buttons at the same time for three seconds.
Filter Life light Orange (Operating time: 3,600~4,000 hr) Time to order a replacement filter.
Red (Operating time: over 4,000 hr) Time to replace the filter.

Note: After replacing the filter, use the Filter Reset function to reset the operating time.

PM density display Shows the density of dust for three different particle sizes.

Getting to know all the functions of your air purifier.

  • The air purifier cleans and refreshes indoor air.

    1. Press the Power button to turn on the air purifier.

      Note: A chime sounds, the operation mode indicator LED lights up, and the air quality indicator light turns on.
      The sensor takes 30 seconds on initial startup to stabilize and prepare an air quality level reading. After 30 seconds, the indoor air quality and PM density levels are displayed.


    2. Press the Speed button to select the desired fan speed.

      Note: Press the button repeatedly to toggle through the settings: Auto - Low - Medium - High - Auto.
      The default mode is AUTO, The AUTO mode controls fan speed based on the air quality.



  • Use this function to set the air purifier at the highest setting for 30 minutes.

    1. Press the Power button.
    2. Press the Turbo button.
    3. Note: The air purifier operates at the highest setting for 30 minutes and then returns to the previous setting.
      If the Turbo function is selected while the air purifier is in the sleep mode, the PM density display turns off after 3 seconds, the Turbo function operates for 30 minutes, and then the product returns to the sleep mode.



    1. Press the Indicator button to check the density of PM10/PM2.5/PM1.0.

      Note: Pressing the button repeatedly toggles through to check the density of PM10 - PM2.5 - PM1.0 in turn.
      The selected density displays for 10 seconds before the display reverts to the highest measured PM level.


    2. Check the dust particle size LED indicators.

      Note: PM density is displayed based on the dust density result with the highest contamination level. For example, if PM10 density is 100 (normal), PM2.5 is 50 (bad), and PM1.0 is 30 (normal), the value for PM2.5 is displayed for PM density.



  • Overall indoor air quality is displayed as one of four colors depending on the contamination level of PM10, PM2.5, PM1.0, and odors.
    (contaminated) red → orange → yellow → green (clean)

    1. Press the Power button to turn on the air purifier.
    2. Press the Off Timer button to set the amount of time in sleep mode until the air purifier automatically turns off.
    3. Note:The amount of time in sleep mode can be set by pressing the Off Timer button repeatedly to toggle through the options: 2 hours, 4 hours, 8 hours, 12 hours, disabled (reverts to normal display).
      Once Off Timer is set, only the Off Timer LED is lighted. All other lights on the product, including the air quality light, are turned off. The fan is maintained at a low speed to keep noise to a minimum.

    4. To disable the Off Timer function, press the Off Timer button repeatedly until 12 appears in the display. Press once more to disable the function and return the display to normal.

    Turning the timer ON

    Turning the timer OFF

    1. Press the Power button.
    2. Press and hold the Indicator and Off Timer buttons at the same time for 3 seconds or until a beep sounds and the LED lights up.
    3. Note: The Lock function helps protect the product from unwanted operation by children or others.
      To disable the Lock function, press and hold the Indicator and Off Timer buttons at the same time for three seconds. A beep sounds and the LED turns off when the Lock function is disabled.
      The Lock function cannot be set while the power cord is unplugged.

    Turning the lock ON

    Turning the lock OFF

  • The Filter Life light turns on based on the operating time.

    • The orange light turns on after 3,600 - 4,000 hours meaning it is time to order a replacement filter.
    • The red light turns on after 4,000 hours meaning it is time to replace the filter.

    To reset the filter life light:

    1. Press and hold the Speed and Turbo buttons at the same time for 3 seconds or longer.


Maintenance should be performed on a monthly basis to keep the unit working at optimal performance.

Maintenance Video

Filter Maintenance

  1. Turn off the power and unplug the appliance. Then pull open the back panel.

  2. Pull the filter set by the top handle to remove it from the appliance.

    Note: Dust may accumulate on the filter net.
    Before disassembling filter set, move the filters to a convenient location for vacuuming.
    Place a newspaper or paper towel down to catch any loose dust.


  3. While holding the filter case over the newspaper, press downward on the handle of the pre-filter to separate it from the filter set.

  4. Clean the pre-filter using a vacuum cleaner or brush. If the filter is very dirty, rinse it under running water after cleaning it with a vacuum cleaner.

    Note: Allow pre-filter to dry completely, out of direct sunlight, before reinstalling.
    Do not use pre-filter while damp. Doing so may cause odor.


  5. Next, remove the 3M MERV 14 filter (if replacing the entire filter set).

  6. Finally, disassemble the deodorizing filter (if replacing the entire filter set).

  7. After cleaning or replacing filters, assemble the filters in the set in the reverse order from removing them. Be sure to insert the filters behind the bottom tab and align the filter handles at the top of the product.


  8. Reassemble the back panel by aligning the bottom and then snapping the panel up into place.


Below are some installation tips to optimize the units performance as well as protect your household.

  • Do not place the air purifier in a corner.
  • Avoid surrounding the appliance with furniture and electronic equipment or crowding it into a corner. The air purifier works best when air is free to circulate around it.
  • Avoid installing the unit within 3 1/4 ft (1 m) of any TV or audio equipment.
  • Provide clearance of at least 5 ft (1.5 m) from lighting appliances and at least 4 in. (10 cm) from walls. Failure to do so may result in product discoloration or loss of cleaning performance.
  • This appliance is not designed for maritime use or for mobile installations such as in RVs, trailers, or aircraft.

Article Feedback

Q1. Overall, how satisfied were you with the usefulness of this information?
1 2 3 4 5
Q1-1. Why were you dissatisfied with the usefulness of this information?
Q2. How would you improve the information?

Characters left : 500 / 500