Great excitement unpacking and fixing up new Z3100 this evening.
Build, etc good, startup progressing pretty fine, inks installed, printheads installed, initial fill seemed to go ok. Installed software while waiting for calibration to finish. Message on main panel restart required to complete. (hadn't yet loaded paper)
On restart. 0% progress on screen for about 1 min then
" 08.11 Restart the Printer. If the problem persists, call support"
No sign of this error code on boards or HP documentation.
Before you do anything, I'd power off, turn the on/off switch to off, unplug, wait a minute then replug. Then power switch on. See what happens.
Try this and you may be lucky. (It's what they will tell you to do).
If not - better make the call.