Epson Job Status Code 312
On the WorkForce Pro WF-C878R/WF-C879R job-status platform, code 312 identifies a scan to email / authentication condition. The job type matters because Epson reuses nearby numeric ranges for different scan and forwarding functions.
Error meaning
Email-server authentication failed.
This meaning is tied to the reviewed family/platform and subsystem below; do not reuse the number by itself on a different printer family or protocol.
Applies to
Epson WorkForce Pro WF-C878R/WF-C879R job-status platform
- WorkForce Pro WF-C878R
- WorkForce Pro WF-C879R
Common formatting
These are formatting/lookup aliases for this reviewed condition, not separate error pages.
- 312
- Epson 312
- WF-C878R 312
- WF-C879R 312
What usually causes it
- The configured email username/password is wrong or no longer valid.
- The authentication method on the printer does not match the server.
- The mail account may be disabled, locked, or subject to a changed policy.
What to try
Review Email Server settings
Open the supported Epson control-panel/Web Config server settings for this platform.
Verify the account credentials
Use the current username/password supplied for the printer's mail account.
Compare authentication method
Make sure the device's method matches what the mail service allows.
Retry the original email scan
Send a small test after correcting authentication.
After each corrective action
Retry the same operation that produced 312. If it now works, stop there rather than changing unrelated printer, network, or service settings.
If the code returns
If 312 returns with known-good credentials, the mail administrator should check account status and authentication policy.
When service may be needed
The checks above stay at the user/admin configuration level. If the setting is controlled by an organization, use the administrator rather than bypassing security or certificate requirements.
Continue with guided troubleshooting
If the printer still is not working after the reviewed checks, carry this verified error context into the guided troubleshooter.
Related information
Verified source
Official Epson WF-C878R Job Status Error Codes FAQ, corroborated against the WF-C879R User's Guide for the same code table.