Charger shows E20 and refuses to start; may mention 'emergency stop active' or 'safety input'.

Safety first: Confirm there is no real emergency before resetting any E‑stop.

• Locate E‑stop: Find any red emergency stop buttons associated with the charger and verify if they are pressed.
• Reset E‑stop: Twist or pull the button (depending on type) to release it, then check if E20 clears.
• Inspect wiring: If you have an external interlock (e.g., gate, switch), have an electrician verify continuity on the safety loop.
• Check configuration: In the BYD settings, ensure the digital input mode matches the installed hardware (normally open vs. normally closed).
• Replace faulty E‑stop: If the switch does not latch or release properly, replace it with a compatible emergency stop switch.