Usually, if you are facing a problem with the printer in the form of error code Oxc19a0020. Then it is due to an issue with the printhead or an issue with ink failure. It clearly shows that there is an issue with the printhead. This happens if the printhead is not aligned properly or if the printhead is not compatible with the printer.
Now, that you know the reason behind the error it is a must to resolve the problem on your end. You can follow the basic troubleshooting to resolve Printer Error HP Oxc19a0020. However, if you are facing any difficulty in fixing the error code then get in touch with the HP printer technicians for help and support.