FAQ

AC9200 - On right side of unit, use paper clip and hold down for 5 seconds after inserting new
filter.
AC9400 - Hold down the filter control for 8 seconds after inserting new filter, unit will beep
before resetting.
AP5800W: Hold “AUTO” and “SLEEP CONTROL” for 3 seconds after inserting new filter.
AC225, AP201: Push and hold the night light control button for 3 seconds after inserting new
filter.
Why won’t the UVC light stop blinking?
The UVC/ blue light is blinking because it is a timer that needs reset. Once the filter has been
replaced with a new Guardian Technologies filter you must manually reset the timer. Please
refer to your product instruction manual or the question titled “How do I reset the UV-C light after
replacing the filter?” on how to reset the timer indicator. A downloadable version of the manual
for your specific air purifier is available under product specifications, or under the support
overview tab.