Philips 3-in-1 Air Purifier is equipped with overheat protection feature. When the temperature of the appliance gets too high, it will trigger the overheat protection (Code E6 displays) and the appliance will stop working. Inappropriate usage could trigger the overheat protection. When this happens, please follow the steps below to check and fix it:

1. Un-plug Philips 3-in-1 Air Purifier from the socket.
2. Open the back cover and check whether the filter package has been removed. If not, please fully remove the filter package, then put the filter back, and re-attach the back cover (see image below).
3. Check whether the air inlet or air outlet is blocked. If so, please remove any obstacle.
4. Wait for 1 minute, then re-plug the device and power on.

If the above steps did not help solve the issue, please contact us for further assistance.