Thanks bro.

We regularly clean the air filter, which is located at the back of the unit. We checked out the other 2, pero umiilaw pa rin ang "service required". Sana mayroong nakapag-DIY ng maintenance ng ganitong klase ng unit.... Appreciate anyone's help though kung may alam kayong nagse-service ng DeVilbiss na Oxygen Concentrator. Salamat po!

5505:home: