Canon S450 User Manual page 347

I Four flashes: BJ cartridge out of ink
An ink tank in a BJ cartridge has run out of ink.
Replace the empty ink tank and press the RESUME button.
Replacing the Ink Tanks
I Five flashes: BJ cartridge not installed correctly
One of the BJ cartridges is not installed correctly. Install a BJ cartridge for the S450.
BJ Cartridges You Can Use With the Printer
I Six flashes: BJ cartridge not installed
One of the BJ cartridges is not installed. Select and install two BJ cartridges (black and
color or photo and color) according to the work you are doing.
I Seven flashes: BJ cartridge defective
There is a problem with one of the BJ cartridges installed in the printer.
Remove each BJ cartridge and check that the contacts on the BJ cartridge and cartridge
holder are clean. Also check that the orange protective tape has been removed from the
print head then install the BJ cartridge again.
If the error occurs again after you resume operation, replace the BJ cartridge.
Replacing a BJ Cartridge
The POWER Light Flashes Orange
Troubleshooting 347