Maybe there is a small piece of paper affecting a sensor within the printer. I've just had that problem with my old HP810C printer. It can get dirty in there. Take a look. Reinsert the ink cartridges, while you're at it.
Try this...hold down any 2 switches and then turn it on. try a combination if possible. this should print a test page.
o Under PDF Documents Owner's Manual(English) (.pdf) (1.33 MB) shows very little about the indicator lights.
o Under HTML Documents User's Guide shows more information about the indicator lights but mentions nothing about the secondary error codes.
Usually answered in minutes!