What does error code 204 mean?

Error code:
204

Error message on display:

EVSE is temporarily not available.
Please call your installer.

Possible Cause:
Software update or blocked by backoffice

Possible solutions:

Contact your installation engineer

OCPP Statusnotification:
-

Suggestions:

Note that errorcode 204 is outdated and replaced with errorcode 206 since firmware 4.5