Lexmark 121.xx Fuser Error
What it means
The fuser is not reaching or holding its working temperature. Switching the printer off at the wall for a couple of minutes sometimes clears a one off. If the code returns, the fuser is the part at fault and needs replacing rather than resetting.
Guides that cover this kind of fault
A guide written for 121.xx 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 121.xx error mean on a Lexmark printer?
The fuser is not reaching or holding its working temperature. Switching the printer off at the wall for a couple of minutes sometimes clears a one off. If the code returns, the fuser is the part at fault and needs replacing rather than resetting.
Is the 121.xx 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.