What does error code E3 mean and how do I fix it?

Error code E3 means the carriage inside the printer has stalled. To resolve it, open the front door and printhead access door, make sure the printhead latch is properly closed and the print carriage is not obstructed, remove any jammed paper or objects blocking the carriage, then close both doors and press the Resume button to continue or the Cancel button to stop. Do not open the printhead latch. (Page 12)