HP 50.4 Fuser Error
What it means
A fuser error on a laser printer, often related to the power supply the printer is plugged into as well as the fuser unit itself. Because the fuser runs at high temperature and carries mains voltage, this is one to approach carefully.
Guides that cover this kind of fault
A guide written for 50.4 itself is still being checked against the manufacturer's documentation. These cover the same underlying problem and are filed under maintenance.
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Common questions
What does the 50.4 error mean on a HP printer?
A fuser error on a laser printer, often related to the power supply the printer is plugged into as well as the fuser unit itself. Because the fuser runs at high temperature and carries mains voltage, this is one to approach carefully.
Is the 50.4 error serious?
This one usually points at a hardware fault rather than something a setting will clear, so treat an unchanged result after a power cycle as a reason to contact the manufacturer rather than to keep trying.
Different code or problem?
Switch off and unplug a printer before reaching inside it. If a fault involves the power supply or internal electronics, or the machine is under warranty, contact the manufacturer or a qualified technician. Full disclaimer. Brand and code names are trademarks of their owners; PrinterFixUp is independent and unaffiliated.