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info HP
Status Ready LED blinks
Indicates that the printer received print data but is not yet printing for reasons such as a job in progress.
? What Causes This
Printing processes running; awaiting start of new jobs.
ⓘ What This Means
Wait until blinking stops indicating operational mode status.
Source: page 4 of the official manual
From the manual
This error code appears in:
HP Laserjet Pro M203 Printer