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error HP
Error Code HP ePrint light flashes three times and turns off
Web services not set up, update available but not installed.
? What Causes This
Printer software or web service setup status issue.
✓ How to Fix It
Press HP ePrint button and Information button simultaneously to print diagnostic page; follow on-screen instructions for resolution based on issues reported.
Source: page 45 of the official manual
From the manual
This error code appears in:
HP Ink Tank Wireless 416