Hello, I'm Wes, and I'll be assisting you today.
The printhead carriage jam can happen if the ink dries and gets stuck.
To fix the problem, you will need to use some force and move the printhead carriage so it can become free.
Slide it to the side about 3 inches to free it.
Check to make sure nothing is blocking the carriage from moving back and forth freely (manually move it with your hand). If the carriage does not move, try to jiggle it up and down to dislodge anything that might be stuck under it. Look for anything that is stuck around the carriage itself, then use moderate force to try and move it manually along the rail.