CANON Error Code 21
MEDIUMCommon IssueCanon Error 21: Paper Output Tray Jam or Obstruction
Canon Error Code 21 indicates a paper jam or obstruction within the paper output tray or its immediate vicinity, preventing printed pages from exiting the printer.
Canon Error Code 21 specifically points to an issue where printed pages are unable to properly exit the printer and accumulate in or near the output tray. This error is typically triggered when the printer's sensors detect an obstruction, a misfeed, or an excessive amount of paper blocking the exit path. It's distinct from jams occurring earlier in the paper path, such as in the input tray or fuser unit. The primary causes for this error include paper being improperly loaded, a sheet getting crinkled or torn as it exits, or foreign objects (like paper clips, staples, or even small debris) falling into the output area. Sometimes, an overfilled output tray can also trigger this error, as subsequent pages have nowhere to go. Less commonly, a malfunctioning paper output sensor or a mechanical issue with the rollers in the exit path could be the root cause, though this is usually preceded by visible paper path issues.
- 1
Turn off your Canon printer and unplug it from the power outlet to ensure safety before proceeding.
- 2
Carefully inspect the paper output tray area for any visible paper jams, torn pieces of paper, or foreign objects. Use a flashlight if necessary to see into darker crevices.
- 3
Gently pull out any jammed paper in the direction of the paper path. Avoid tearing the paper, as small pieces left inside can cause further issues.
- 4
Check the rear access panel (if your model has one) or lift the scanner unit/top cover to look for any paper fragments that might have been pulled back into the printer's interior near the output.
- 5
Ensure the paper output tray is not overfilled. Remove any excess printed pages to make space.
- 6
Verify that the paper being used is within the printer's specifications (weight, size, type) and is not curled, creased, or damp, as this can lead to misfeeds.
- 7
Close all covers and panels securely. Plug the printer back in and turn it on to see if the error clears.
- 8
Perform a test print to confirm the issue is resolved. If the error persists, try resetting the printer by unplugging it for 5-10 minutes before plugging it back in.
- 9
If available, run the printer's internal cleaning or paper path maintenance routine through its control panel or driver software, as this can sometimes dislodge small debris.
You should consider calling a specialist if, after performing all DIY troubleshooting steps, the Canon Error Code 21 persists. This is especially true if you suspect a mechanical failure, such as damaged rollers in the output path, a faulty paper output sensor, or if you're unable to locate or safely remove a stubborn paper jam. If the error code appears immediately upon startup without any paper in the printer, it could indicate a more complex internal sensor or board issue that requires professional diagnosis and repair.
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- • Canon PIXMA TS Series (e.g., TS3320, TS6320)
- • Canon PIXMA TR Series (e.g., TR4520, TR8620)
- • Canon PIXMA MX Series (e.g., MX492, MX922)
- • Canon imageCLASS MF Series (e.g., MF264dw, MF445dw)
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