Just like any other piece of electrical equipment, an oxygen concentrator can stop working due to technical issues or after it's gotten over a certain age. You might also have instances where it can malfunction due to an outside influence, with no problems in the concentrator itself.
If an oxygen concentrator is not providing oxygen, it could be due to several different reasons. The system in an oxygen concentrator is made up of a few intricate parts that all work together to purify and deliver medical-grade oxygen, so you can breathe it in.
However, before you call a maintenance technician, you can do some troubleshooting on your own to see if you can fix the problem yourself. Sometimes, the cause of a big problem can be a small and easy fix.