Canon S400 User Manual page 339

Two flashes: Out of paper, paper jam, paper feed error
If no paper is loaded in the auto sheet feeder, or if the paper is not loaded correctly, set the
paper correctly and press the RESUME button.
If paper has jammed in the printer, remove the jam and press the RESUME button.
Paper Jams or Does Not Feed
Note If the paper is not feeding into the auto sheet feeder, adjust the paper guide
and insert the paper.
Three flashes: Paper jam
If paper has jammed in the printer, remove the jam and press the RESUME button.
Paper Jams or Does Not Feed
The POWER Light Flashes Orange
Troubleshooting 339