Air purifier error codes and fault guides
Browse 41 published, evidence-gated Air purifier guides. Each page states the supported model and region, official source, safe checks, and the point to stop.
Air purifier fault guides
25–41 of 41
the Hall sensor is not working correctly
Er is identified by Philips support as the Hall sensor is not working correctly. Follow the official, model-scoped checks and service boundary below.
the pre-filter needs cleaning and its timer needs resetting
F0 / FO is identified by Philips support as the pre-filter needs cleaning and its timer needs resetting. Follow the official, model-scoped checks and service boundary below.
the SmartAir Control sensor is measuring air quality during startup
Flashing red air-quality light is identified by Philips support as the SmartAir Control sensor is measuring air quality during startup. Follow the official, model-scoped checks and service boundary below.
the HP100 or HP200 filter timer indicates filter service is due
FILTER LIFE flashing is identified by Shark support as the HP100 or HP200 filter timer indicates filter service is due. Follow the official, model-scoped checks and service boundary below.
the HP100 or HP200 cannot operate safely with a filter left in its shipping packaging
Filter still wrapped is identified by Shark support as the HP100 or HP200 cannot operate safely with a filter left in its shipping packaging. Follow the official, model-scoped checks and service boundary below.
the HC500 or HC450 filter must be removed from its shipping bag before use
HC500 filter packaging is identified by Shark support as the HC500 or HC450 filter must be removed from its shipping bag before use. Follow the official, model-scoped checks and service boundary below.
the HE400 filter-life counter still needs resetting after filter installation
HE400 filter timer not reset is identified by Shark support as the HE400 filter-life counter still needs resetting after filter installation. Follow the official, model-scoped checks and service boundary below.
the HE600 filter-life counter still needs resetting after filter installation
HE600 filter timer not reset is identified by Shark support as the HE600 filter-life counter still needs resetting after filter installation. Follow the official, model-scoped checks and service boundary below.
the HP232 uses FILTER LIFE to show remaining filter percentage
HP232 filter-life display is identified by Shark support as the HP232 uses FILTER LIFE to show remaining filter percentage. Follow the official, model-scoped checks and service boundary below.
the Smart Air Purifier 4 may have a filter, foreign-object, or sensor obstruction
Abnormal noise is identified by Xiaomi support as the Smart Air Purifier 4 may have a filter, foreign-object, or sensor obstruction. Follow the official, model-scoped checks and service boundary below.
the filter-compartment cover is not detected as closed
Cover unclosed is identified by Xiaomi support as the filter-compartment cover is not detected as closed. Follow the official, model-scoped checks and service boundary below.
the purifier cannot confirm the expected genuine filter installation
Filter installation warning is identified by Xiaomi support as the purifier cannot confirm the expected genuine filter installation. Follow the official, model-scoped checks and service boundary below.
the filter is nearly exhausted
Filter life below 5% is identified by Xiaomi support as the filter is nearly exhausted. Follow the official, model-scoped checks and service boundary below.
the upper grille is not detected as closed
Grille unclosed is identified by Xiaomi support as the upper grille is not detected as closed. Follow the official, model-scoped checks and service boundary below.
the Mijia Smart Air Purifier 6 has detected a motor condition
Motor error is identified by Xiaomi support as the Mijia Smart Air Purifier 6 has detected a motor condition. Follow the official, model-scoped checks and service boundary below.
the laser particle sensor reading may be inaccurate or delayed
PM2.5 reading abnormal is identified by Xiaomi support as the laser particle sensor reading may be inaccurate or delayed. Follow the official, model-scoped checks and service boundary below.
the Xiaomi Smart Air Purifier 4 does not detect a closed top grille
Top grille not closed is identified by Xiaomi support as the Xiaomi Smart Air Purifier 4 does not detect a closed top grille. Follow the official, model-scoped checks and service boundary below.