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 locate your model below and follow the instructions:

AP2200CA, AP2800CA, AC4820, AC4825, AC5000, AC5900WCA - Hold down the HEPA filter reset button for 5 seconds after inserting new filter.

AC4700B, AC4900CA, AC4300, AC5300 - Hold down the UV button on the unit for 5 seconds after inserting new filter.

CDAP4500, CDAP5500, AC5350 - Hold down the timer button for 5 seconds after inserting new filter.

AC4200W - Hold down the power button for 5 seconds after inserting new filter.

AC5250PT - Insert pen tip into HEPA Reset area on control panel to restart the system.

AC5600W - Reset the filter indicator by holding the fan speed button for 5 seconds.

AC9200W - On right side of unit, use paper clip and hold down for 5 seconds to reset indicators.

AC9400W - Hold down the filter control for 8 seconds, unit will beep before resetting.