DIAGNOSIS No power to the main control board. The most common cause is a tripped thermal fuse in the power supply circuit, often from a voltage spike.
FIX Unplug the unit. Press and hold the Power/Start button firmly for 30 full seconds. This can drain residual charge and reset the system. Then, plug it directly into a different wall outlet (not a power strip). Try turning it on.
IF THAT DIDN'T WORK The internal thermal fuse or main control board has likely failed. This requires a technician. Contact Ninja support. Do not open the base yourself.
HEADS UP Always plug the Foodi directly into a wall outlet. Power strips and extension cords can cause low voltage, which stresses the electronics and can cause this failure.