E203
Enphase
OCPP / Backend Authentication Fault
Charger shows E203; app may indicate 'OCPP server error' or 'Backend authentication failed' (for networked/managed installations).
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Incorrect OCPP server URL or credentials, TLS certificate mismatch, Network firewall blocking OCPP ports, Firmware not compatible with backend configuration
How to Fix / Troubleshooting
Context: This applies mainly to commercial or managed Enphase EV chargers using OCPP.
- Verify configuration: In the management portal or local configuration interface, confirm the OCPP server URL, port, and credentials are correct.
- Check certificates: Ensure any required TLS certificates are valid and correctly installed on both server and charger.
- Firewall rules: Confirm that outbound traffic from the charger's network to the OCPP server port is allowed.
- Restart services: Reboot the charger and, if possible, restart the OCPP backend service.
- Vendor support: If E203 persists, coordinate with Enphase and the OCPP backend provider to review logs and update firmware or configuration.
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Repair Difficulty
Medium
3/5
Required Part
Enphase EV Charger OCPP Communication Stack / Configuration
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