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error HP
Error Code LED blinking with both Ink Alert lights blinking after install
There is an issue with installing or reinstalling cartridges.
? What Causes This
Problem detected during installation of new/used ink cartridges.
✓ How to Fix It
Ensure proper installation, remove and replace if necessary for each cartridge ensuring contacts are clear of debris before attempting to use printer again.
Source: page 6 of the official manual
From the manual
This error code appears in:
HP Deskjet Ink Advantage 2135 All IN One Printer