E009 displayed; charger indicates internal communication error and is unresponsive to start commands.

Safety first: Disconnect power before handling internal connectors or boards.

• Step 1 – Power cycle: Turn off the charger at the breaker for 5 minutes, then power back on. Many transient communication faults clear after a reboot.
• Step 2 – Check low-voltage connectors: With power OFF, open the enclosure and gently reseat all low-voltage plugs between the main PCB, display module, RFID reader, and internal meter. Ensure locking tabs click into place.
• Step 3 – Inspect communication cabling: Look for pinched, cut, or abraded twisted-pair cables used for CAN/RS485 inside the unit.
• Step 4 – Firmware check: Using the Alfen installer tool, verify that all modules are running compatible firmware versions. Update firmware according to Alfen’s official procedure if required.
• Step 5 – Module isolation: A technician can temporarily disconnect optional modules (e.g., RFID, external meter interface) to see if E009 clears, helping to identify the faulty module.
• When to call a technician: Persistent E009 errors usually require professional diagnostics and possible replacement of the internal meter or main PCB.