Since the life of the head (nozzle) has a limit, even if you use only imported cartridges or OEM products, it should be replaced after some time.
Because of this, the manufacturer charges for the replacement of the head after free of charge warranty period passes.
We recommend that you use it periodically, at least once per month, and clean the head from time to time, keeping in mind that the life span of the head can be shortened because of bad environment or long time of negligence.
When a problem occurs, you must get inspection as soon as possible to recover it.