HP LaserJet Pro 400 color Printer M451 series - Manual (Page 163)

Once an HP supply has reached very low, HP's premium Protection Warranty on that supply has
ended. All print defects or cartridge failures incurred when an HP supply is used in continue at very
low mode will not be considered to be defects in materials or workmanship in the supply under the HP
Print Cartridge Warranty Statement.
Device error Press [OK]
Description
An internal error occurred.
Recommended action
Press the OK button to resume the job.
Front door open
Description
The product front door is open.
Recommended action
Close the door.
Genuine HP supply installed
Description
A genuine HP supply was installed.
Recommended action
No action necessary.
Incompatible <color>
Description
You have installed a print cartridge that is intended for use in a different HP product model. The
product might not function correctly with this print cartridge installed.
Recommended action
Install the correct print cartridge for this product.
Incorrect supplies
Description
More than one print cartridge is installed in the incorrect slot.
ENWW Interpret control panel messages 145