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7. Filter Life Indicator
When the Filter Cartridge is at 90% of its capacity, the air purifier will beep 3 times when the power is turned on indicating it is
time to order a new filter cartridge. The Filter button will flash until the Filter Cartridge is replaced and the Filter Life Indicator is
reset.
To reset the Filter Life Indicator, press and hold the Filter button for 5 seconds. The air purifier will beep 3 times and the light for
the Filter button will turn o.
To order a replacement filter
cartridge, go to Aprilaire.com
or call 800.931.0014.
8. Light Sensor
If the room is dark for more than 3 minutes, the air purifier will automatically go into Sleep Mode. When that occurs, you can still
adjust the fan Speed and Timer, and use the Lock function.
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