ErrorCodeDoctor
Canon Printer (imageCLASS) #766 error code
Error code #766 on your Canon imageCLASS printer means the digital certificate being used for secure communication has expired. Update the certificate or use a certificate that is still valid. Also check that the date and time settings on the machine are correct as an incorrect date can cause certificates to appear expired.
Common causes
- The digital certificate has passed its expiry date
- The machine date and time are set incorrectly causing a valid certificate to appear expired
How to fix it
-
1
Update the expired certificate or replace it with a valid one
-
2
Check and correct the date and time settings on the machine
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3
Try the operation again with the updated certificate
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
#766 error — frequently asked questions
What does the #766 error mean on a Canon printer (imageclass)?
The digital certificate used for communication has expired
What causes the #766 error?
The #766 error is usually caused by: The digital certificate has passed its expiry date; The machine date and time are set incorrectly causing a valid certificate to appear expired.
Can I fix the #766 error myself?
It's possible for a moderately handy person, but budget 5–10m and expect some disassembly.
How much does it cost to fix the #766 error?
Fixing the #766 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 #766 error?
In most cases yes, but it's best to address the #766 error soon — see the fix steps below to resolve it.