Canon MF247dw User Manual page 619

Result
"OK" indicates that the transmission was completed successfully while "NG" and three digits (an error code)
indicates that the transmission failed (
Sent/Error
For e-mail, TX Result Reports indicate the transmission result between the machine and the mail server, not
between the machine and the destination address. Even if the transmission fails, a three-digit error code will
not be printed. To check the error code, print a Communication Management Report (
Management Report(P. 613) ).
To print a part of a fax document on the report
When you select <On> or <Only When Error Occurs>, a part of a fax document can be included in the report. Tap
<Include TX Image> to <On>.
Maintenance
When an Error Code Appears(P. 560) ).
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Communication