Charger shows E16; app may report phase loss or phase imbalance on three‑phase EO chargers.

Safety first: Three‑phase systems carry significant energy. Only qualified electricians should work on them.

• Check upstream protection: Inspect fuses or breakers feeding each phase of the EO charger. Replace any blown fuses and investigate the cause of the failure.
• Measure phase voltages: At the EO input terminals, measure each line‑to‑neutral and line‑to‑line voltage. Significant deviation between phases indicates a supply issue that must be corrected.
• Inspect terminations: With power off, tighten all phase terminals in the charger and at any intermediate junctions. Look for heat damage indicating a poor connection.
• Balance loads: If the EO charger is part of a larger three‑phase installation, ensure that loads are reasonably balanced across phases to avoid persistent imbalance faults.
• PCB phase monitor: If supply and wiring are correct but E16 persists, the phase monitoring circuit on the main PCB may be defective and require replacement.