ℹ
info HP
Status Cleaning...
Printer is cleaning — automatic maintenance cycle in progress.
? What Causes This
Printer is performing routine cleaning operations.
ⓘ What This Means
No action required. Wait for cleaning cycle to complete.
Source: page 8 of the official manual
From the manual
This error code appears in:
HP Color Laserjet Pro M255 M256 Printer