If the heads still do not move, carry out the following emergency response measure, and then contact your authorized dealer.
IMPORTANT
Open and close the front cover and right cover gently. If you open and close them forcefully or release the cover when it is partly open, not only may it malfunction, but you may also be injured. When opening and closing the front cover, grasp the center of the front cover to open or close it.
Procedure
Switch off the power, and then open the front cover.
Gently move the print-head carriage to the home position by hand.