CUCKOO CAC-K1910FW air quality indicator light turns off

Hi, I have ran it for a couple days on auto/low setting. This unit has an LED air quality indicator light that shows the current state of the air (red=bad, blue=good).

I am under the impression that this light stays on 24/7 but both days it went off around dusk. I can cycle through the mode settings and the air quality indicator light will turn back on but then shut off again after a minute. Why is this happening and how can I keep the air quality indicator light on all day and night?

I have tried calling, texting, and emailing the company but no luck reaching them so far.

Does anyone know if this is supposed to be happening? If so, is there a way I can keep the air quality indicator light on all day and night?