ErrorCodeDoctor
Canon Printer (imageCLASS) #839 error code
Error code #839 on your Canon imageCLASS printer means SMTP authentication failed because the username or password for the email server is incorrect. Check and correct the SMTP authentication credentials in the machine's email settings.
Common causes
- The SMTP authentication username or password is set incorrectly in the machine's email settings
How to fix it
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1
Go to the machine's email settings
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2
Correct the SMTP authentication username and password
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3
Save the settings and try the email operation again
Related Canon Printer (imageCLASS) error codes
#001
An original document has jammed in the feeder
#003
A fax could not be sent or received because the data size is too large
#005
A fax could not be sent because the recipient's machine did not respond within 35 seconds
#012
A fax could not be sent because the recipient's machine has run out of paper
#839 error — frequently asked questions
What does the #839 error mean on a Canon printer (imageclass)?
SMTP authentication failed — the username or password for email is incorrect
What causes the #839 error?
The #839 error is usually caused by: The SMTP authentication username or password is set incorrectly in the machine's email settings.
Can I fix the #839 error myself?
It's possible for a moderately handy person, but budget 5m and expect some disassembly.
How much does it cost to fix the #839 error?
Fixing the #839 error on a Canon printer (imageclass) typically costs $0, depending on parts and whether you do it yourself or hire a technician.
Is it safe to keep using my printer (imageclass) with the #839 error?
In most cases yes, but it's best to address the #839 error soon — see the fix steps below to resolve it.