HP LaserJet M4349 Multifunction Printer series - Manual (Page 232)

Faxes are not printing at the device.
Cause Solution
The Schedule Printing of Faxes mode is enabled. Faxes will
not print until it is disabled Disable the Schedule Printing of Faxes mode. See the fax
guide for information about changing the setting.
The device toner level is low, or it has run out of toner.
The device stops printing as soon as it is low on toner or runs
out of toner. Any faxes received are stored in memory and are
printed after the toner has been replaced.
Replace the print cartridge.
218 Chapter 11 Problem solving ENWW