HP LaserJet Pro 400 color Printer M451 series - Manual (Page 160)

If the message persists, contact HP support.
55.X Error Turn off then on
Description
The product has experienced an internal error.
Recommended action
Turn the product power off, wait at least 30 seconds, and then turn the product power on and wait for
it to initialize.
If you are using a surge protector, remove it. Plug the product directly into the wall socket. Turn the
product power on.
If the message persists, contact HP support.
57 Fan error Turn off then on
Description
The product has experienced a problem with its internal fan.
Recommended action
Turn the product power off, wait at least 30 seconds, and then turn the product power on and wait for
it to initialize.
If you are using a surge protector, remove it. Plug the product directly into the wall socket. Turn the
product power on.
If the message persists, contact HP support.
59.X Error Turn off then on
Description
The product has experienced a problem with one of the motors.
Recommended action
Turn the product power off, wait at least 30 seconds, and then turn the product power on and wait for
it to initialize.
If you are using a surge protector, remove it. Plug the product directly into the wall socket. Turn the
product power on.
If the message persists, contact HP support.
79 Error Turn off then on
Description
The product has experienced an internal firmware error.
142 Chapter 11 Solve problems ENWW