Lexmark C3224
121.71A error code at first boot up or while printing or doing a calibration
Turn the printer Off and turn it back On after a minute.
Check the printer if the error message still appears.
If the issue does appear, please contact Lexmark support for further diagnosis of this issue.
Does a 900 error message appear on your printer? Check out the following steps to troubleshoot the problem.
Unable to downgrade code