Charger shows E17; internal watchdog or CPU error, unit may reboot repeatedly

Safety first: Frequent resets can interrupt charging unexpectedly. Inform users before taking the charger offline for diagnostics.

Step-by-step checks:

• 1. Note conditions: Observe when E17 occurs (e.g., at start of charge, during high load, when communication is active). This can help identify triggers.
• 2. Firmware update: Check for and install the latest KEBA firmware, following official procedures carefully.
• 3. Simplify configuration: Temporarily disable non-essential features (external communication, complex load management) to see if stability improves.
• 4. Inspect wiring: Open the housing and check that low-voltage control wiring is neatly routed away from high-current conductors to reduce EMC interference.
• 5. Check grounding: Verify that the KEBA unit is properly earthed and that the protective earth connection is secure.
• 6. Replace main board: If resets continue after firmware and wiring checks, replace the main control board.

Document all changes and test the charger under typical load for an extended period after repair.