Over time your ultrasonic disc will produce less mist
this gradual change over time may not be noticeable until
one day it can no longer atomize water and oils effectively.
Some units actually use the disc to determine when the resrvoir is low on water,
a faulty disc will confuse the controller and shut the unit off immediately due to a faulty disc.
Ultrasonic discs have a lifespan of about 5000 hours.
This is a physically moving part in your diffuser.
At then end of it's life, it needs to be changed, think of it as routine maintenance.
Well, this could very likely be the disc, or a power supply. We suggest customers
try a different power supply from an identical unit if possible before purchasing a disc.