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That is listed as a 'printhead tilt fault'.
Turn Off the power, wait 2 to 5 or more minutes, then turn the printer On again, and wait a bit to see if the error is cleared.
After that, if the error persists, you might want to remove the waste ink tray, and check for spilled ink.
The waste tray, labeled as 'B', is located under a hatch on the right side of the printer, as shown:
Pull the waste tray ('B') completely out of the printer. Check inside the printer for spilled ink. Spilled ink inside the printer will interfere with operation, and requires (in this sort of case) a Service Call on the problem, unfortunately.