Air purity indicator is not changing colour/is not turning blue

• Please clean the pre-filter with a dry brush/vacuum cleaner
• Clean the air quality sensor
• Reset the filter
• Make sure that the filters are placed facing the correct direction (all filters have numbering and direction tags on them. Make sure that the tag is facing forwards)
• If the PM2.5 level is higher than 150, use the product on the highest fan speed/in turbo mode
• Try to keep all doors/windows closed while operating the air purifier
• Check sensitivity mode (applies to AC4014 TO AC4372 only). Keep the product in standard mode
• Make sure that packing material (polythene) is removed from all of the filters

The information on this page applies to the following models: AC1715/30 .