If your diffuser prematurely stops operating....be sure to clean the oil that may have built up on the disc before replacing the disc with a new one.
After approximately 3,000 hours of use the ceramic disc is aging in your diffuser and will need to be replaced.
The maintenance kit contains the tool needed to remove and replace the ceramic disk (which is also included in the kit).
This same kit also works for the ZAC diffuser models; Allay, Dew, Noor & Mirage. Instructions included. Please see attached video for demonstration.