Over time, mineral deposits from water can build up inside your humidifier, especially around the tank and pump. This buildup, commonly called scale, can interfere with normal operation and may cause the humidifier to appear as if it is not working. 

Descaling is important because:  

• Scale can block or reduce pump performance, preventing proper water circulation. 
• Mineral buildup can trigger operational issues, even when water levels and settings are correct. 
• Regular descaling helps maintain efficiency, ensuring the humidifier runs smoothly and quietly. 
• It extends the lifespan of internal components, such as the pump and tank. 

If your humidifier has water in the tank, the humidity settings are correct, and the pump still does not appear to be working, descaling the pump and tank is a recommended next step.