Troubleshooting My air purifier is plugged in but it does not work Find out what are the possible solutions if your Philips Air purifier does not work even though it is plugged in and switched on. The timer of your Philips Air purifier is set to a specific time interval Reset or turn off the timer. The wall outlet does not work Try a different electrical outlet or check the wall switch. The filter alert status is displaying the filter code Replace the corresponding filter and reset the filter lifetime counter. (See “Replacing filters”) The problem persists Get in touch with the Philips customer support for assistance. Visit the customer support page on www.philips.com/support where you can find the contact details of your Philips local customer support.