Kyocera TASKalfa MZ4000i/MZ3200i FAX platform — E/U04300
Kyocera E/U04300 means the recipient does not support the requested encrypted fax communication. The guidance here is specific to TASKalfa MZ4000i/MZ3200i FAX platform and the Fax/encryption compatibility operation.
Error meaning
The recipient does not support the requested encrypted fax communication.
This interpretation is tied to the reviewed family/platform and subsystem. Do not reuse the code by itself on another printer family.
Applies to
TASKalfa MZ4000i/MZ3200i FAX platform
- TASKalfa MZ4000i
- TASKalfa MZ3200i
Common formatting
These are lookup/formatting aliases for this reviewed condition, not separate pages.
- E/U04300
What usually causes it
- The receiving fax cannot complete the requested encrypted fax communication. The telephone connection may be normal, but the far-end device or its current configuration does not support the encryption feature being requested.
- The exact condition recorded for this code is: The recipient does not support the requested encrypted fax communication.
- Confirm with the recipient whether their fax supports the same encrypted communication method. If organizational policy permits an unencrypted fax, choose that intentionally; otherwise use a recipient/device that supports the required feature.
What to try
Check the condition this code actually names
Send without encryption only if policy allows, or use a recipient/device that supports the required encryption.
Isolate the affected part of the workflow
Confirm with the recipient whether their fax supports the same encrypted communication method. If organizational policy permits an unencrypted fax, choose that intentionally; otherwise use a recipient/device that supports the required feature.
Run a controlled confirmation test
Retry with the agreed communication method and the same destination number. Do not alter encryption policy silently just to make the job pass.
After each corrective action
Retry the original operation that produced E/U04300. If it works, stop there rather than moving into unrelated troubleshooting.
If the code returns
If E/U04300 occurs with a device that should support encryption, record the recipient model and configured encryption mode so administrators can compare feature compatibility.
When service may be needed
Encryption requirements are a policy boundary. Do not weaken required protection or use service settings to bypass an unsupported secure-fax feature.
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 two-model FAX guide. Error Code List establishes fax/i-FAX meanings and family scope; public guidance is independently paraphrased.