Fix Canon Printer Spooler Error Error 21 — Windows Error Code CANON-PRINTER-SPOOLERERROR-021

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⚡ Quick Fix

Reset the Print Spooler Service: Open Command Prompt as Administrator

👇 See all 2 solutions below

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📑 Table of Contents

What is Error CANON-PRINTER-SPOOLERERROR-021? Common Causes Step-by-Step Solutions Prevention Tips Related Errors

💡 What is Error CANON-PRINTER-SPOOLERERROR-021?

Windows System Error Code CANON-PRINTER-SPOOLERERROR-021, known as Canon Printer Spooler Error Error 21, is a General System error that occurs during core Windows operations. The error indicates that: Canon Printer Error: The print spooler service has stopped. Restart the service via services.msc or run the printer troubleshooter. When this error is encountered, the Windows operating system was unable to complete the requested operation within the system services subsystem. The error code CANON-PRINTER-SPOOLERERROR-021 is returned by the GetLastError() function and provides developers with a specific identifier to diagnose the root cause of the failure. The symbolic name Canon Printer Spooler Error Error 21 maps directly to this numeric code and is commonly referenced in Microsoft documentation, developer forums, and system logs. Understanding this error and its context within core Windows operations is essential for effective troubleshooting.

⚠️ Common Causes

Print Spooler service is hung or crashed
Corrupted print jobs stuck in the queue
Incompatible or outdated printer drivers

✅ Step-by-Step Solutions

1 Reset the Print Spooler Service

Open Command Prompt as Administrator
Run: net stop spooler
Run: del /f /q C:\Windows\System32\spool\PRINTERS\*
Run: net start spooler
This clears the print queue and restarts the printing service

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2 Reinstall Printer Drivers

Open Device Manager → Expand 'Print queues'
Right-click your printer → Uninstall device
Disconnect the printer, restart your computer
Reconnect the printer and let Windows install fresh drivers
Or download the latest driver from the manufacturer's website

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💻 Diagnostic Command

Run this PowerShell command to find related events in your system log:

Get-EventLog -LogName System -Newest 20 | Where-Object {$_.Message -like "*CANON-PRINTER-SPOOLERERROR-021*" -or $_.Message -like "*Canon Printer Spooler Error Error 21*"} | Format-List

💡 Open PowerShell as Administrator, paste the command above, and press Enter.

🛡️ Prevention Tips

Keep printer drivers updated from the manufacturer's website
Clear the print queue if a job gets stuck instead of sending more jobs

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Last updated: 2026-03-13

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Based on Official Microsoft Documentation

Solutions Tested on Windows 10 & 11

Error codes sourced from Microsoft Win32 SDK. Updated 2026-03-13.