Philips 2000i Series Manual page 4

If filter replacement light 1 flashes (in red)
The pre-filter needs to be cleaned. You can wash it under a running tap and dry it completely it
before reinstalling it. Alternatively, you can clean it using a vacuum cleaner.
If filter replacement light 2 is on or flashing (in red)
If filter replacement light 2 is flashing or is on continuously, you need to replace the multi-care
filter (for Air purifier AC4004 only). This filter cannot be washed. After replacing, make sure
you reset your appliance
Filter replacement light 3/4 is on (in red)
The filter 3 (activated carbon filter) and filter 4 (HEPA filter) need to be replaced. After
replacing them, make sure you reset your purifier. Please note that these filters cannot be
washed.
Filter replacement light 5 is flashing (in red)
This light indicates that the humidification filter should be replaced.
B) All other purifiers
In this case (and for models without a display screen), your Philips Air Purifier features a filter
replacement light. This light will stay on and will be coloured red.
If your purifier has a display screen, then it will show one of the following error codes:
Codes A1 to A9:
Replace NanoProtect S3 HEPA filter.
Codes C1 to C9:
Replace NanoProtect S3 AC filter.
Code: F0
Clean the Pre-filter.
What is the CADR specification in my Philips Air Purifier?
If you would like to know what the CADR specification mentioned in your Philips Air Purifier's
package or leaflet is, read about it here.
What is CADR?
CADR stands for Clean Air Delivery Rate.
It indicates the volume of filtered air delivered by your Philips Air Purifier. Your Air Purifier
will run faster when the amount of particles, tobacco smoke, pollen and dust increases.
What does the PM2.5 indicator in my Philips Air Purifier mean?