It's the same with toner levels. Printer was saying toner was empty. I reset the toner levels of the printer using that hidden maintenance button combination. It kept printing just fine for a looong time after that.
My HP laser predates most of this idiocy, but even on it the toner levels are brazen lies. I've printed just fine for some 2+ years after the "very low" toner warnings started across all colors (though admittedly quite low volume; it's more a scanner than a printer).
