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Hello, the unit is sensing particles or odors (vocs) and changing the air quality indicator to red. If the unit is being used in the auto mode, the fan speeds will automatically adjust to clean the air at the best rate.
Sorry, there was a problem. Please try again later.I have found the sensor to be totally undependable. The unit should know the difference between a volatile compound and something that is not harmful to your health. If I have lavender oil diffusing in the bedroom my light turns red.
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