20 Most Recent HP DesignJet Z2100 InkJet Photo Printer - Page 2 Questions & Answers

84:11 doesn't show up in the service manual...are there any other errors you are getting at the same time?

reset tool for hp z 2100 ink cartridges expired

http://www.fixya.com/support/t5086304-error_code_21_13_hp_z2100this will help

try thishttp://www.fixya.com/support/t5086304-error_code_21_13_hp_z2100

try to alignment printhead

It's a firmware error.Unplug the power cord. Wait a few minutes and plug it back in. Power up. If the error is gone...good.If the error comes back, go to hp.com and download new firmware.

Possible that the firmware that you upgraded was not the correct one for your unity. Double check that you have the correct upgrade.