A: I believe you need to press and hold down the Blue Air button for about 3 or 4 seconds.
A: I have held the button down for a bit and it went off.
A: Try holding the main button down for 10-15 seconds that should reset it.
A: Hi there! I'm sorry for the delay in getting back to you here. No, the 211+ and the 211+auto have their own size pre-filters.
A: No it must be turned back on.
A: You would need to press the button to turn it on
A: Yes it does. It should work with smart device.
A: yes, it comes back on.
A: When power is restored, it comes back on.
A: Yes, it'll power up again if the power is out (or if you plug it back in).
A: Expected it to help allergies but did not meet my expectations
A: Yes, that's what I bought it for.. making a loud belt noise
|Name||D480True HEPA 3-Stage Air Purifier, AHAM Verified for 480 sq.ft.||Blue Pure 211+ Air Purifier with Allergen and Odor Remover, Washable Pre-Filter||Hi-Performance Ultra Quiet Air Purifier with HEPA Filter for Large Rooms up to 335 sq.ft.||Pure Cool, Air Purifier + Fan with HEPA filter, TP01|
|Maximum coverage area (sq. ft.)||480||540||335||800|
|Air Purifier Type||Console||Console||Console||Tower|
|Primary Filter Type||HEPA - True||HEPA - Type||HEPA - True||HEPA - True|
|View Product||View Product||View Product||View Product|