OKI 320 Fuser Unit Missing or Not Seated
What it means
The printer cannot detect the fuser. Most of the time it is fitted but not locked down, which happens easily after clearing a jam. Open the top cover, check that both fuser levers are in the locked position, and close everything firmly.
Guides that cover this kind of fault
A guide written for 320 itself is still being checked against the manufacturer's documentation. These cover the same underlying problem and are filed under maintenance.
- Printer Alignment Failed: Causes and FixesPrinter alignment fails when the scanner glass is dirty, print head nozzles are clogged, or incorrect paper is used for the test page. Clean the...
- Printer Making Clicking Noise: Causes and FixesClicking noises are usually caused by worn gears, foreign objects in the paper path, or unseated ink cartridges. Turn off the printer, inspect the...
- Cleaning Printer Rollers: How to Restore Grip and Fix Paper SlipsClean printer rollers by wiping them with a lint-free cloth dampened with water or a mild rubber cleaner to remove paper dust and restore grip. Avoid...
Common questions
What does the 320 error mean on a OKI printer?
The printer cannot detect the fuser. Most of the time it is fitted but not locked down, which happens easily after clearing a jam. Open the top cover, check that both fuser levers are in the locked position, and close everything firmly.
Is the 320 error serious?
It is worth attention but not alarm. Switching the printer off, unplugging it for a minute and checking for anything physically in the way resolves a large share of cases before anything else is needed.
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.