Purifier not connected to home network
Ensure you have the correct password
Check the password you have entered is correct, ensuring the characters in the password correlate with what you are typing in (for example, an I and a 1 or an 0 and an O can be easily confused).
Check the network is correct.
Check that the network you are trying to connect to is your home network.
Some network names can have a similar configuration of characters and can be hard to tell apart.