Charger shows E04 and refuses to start; sometimes occurs after a lightning storm or power surge.

Safety: Overvoltage can damage equipment and create fire risk. Turn OFF the breaker and lock it out before opening the charger.

• 1. Verify supply voltage:
  • Use a multimeter (by a qualified person) at the service panel to confirm the line-to-line and line-to-neutral voltages match the AMPROAD charger rating (e.g., 208–240 V AC).
  • If voltage is consistently high, contact your utility or an electrician.
• 2. Inspect input wiring:
  • Open the charger and check the input terminal block.
  • Ensure hot, hot, and ground are correctly landed; no neutral on a line terminal unless specified by AMPROAD.
  • Tighten all terminal screws to the specified torque.
• 3. Check for surge damage:
  • Inspect the input/surge protection board for burnt MOVs, discoloration, or cracked components.
  • If any surge components are damaged, replace the input/surge protection board.
• 4. Reset and test:
  • After correcting wiring and replacing any damaged parts, restore power at the breaker.
  • Clear the E04 by power-cycling and attempt a charge session.
• 5. Add external protection: In areas with frequent surges, consider installing a whole-home surge protector upstream of the AMPROAD charger.