Charger shows E03 and immediately stops or refuses to start charging; vehicle may briefly start then drop out.

Safety first: Disconnect the charger from power and do not use it if you suspect a ground fault. Water and electricity are extremely dangerous together.

• 1. Inspect for moisture:
  • Check the J1772 connector for water, condensation, or dirt.
  • If wet, gently shake out excess water and allow the connector to dry completely in a warm, dry area for at least 24 hours.
• 2. Examine the cable jacket:
  • Look for cuts, abrasions, or crushed sections along the Megear cable.
  • If copper conductors are visible or the cable feels soft/spongy from damage, the entire cable assembly must be replaced.
• 3. Check ground connection:
  • Have a qualified electrician verify that the outlet or hardwired circuit has a solid equipment ground.
  • Tighten any loose ground screws in the outlet box (with power off).
• 4. Internal GFCI board inspection (advanced):
  • With power disconnected, open the Megear housing.
  • Locate the ground fault detection (GFCI) board or circuitry on the main control board.
  • Look for burn marks, cracked components, or loose connectors on the current transformer (CT) ring that senses leakage.
  • If damaged, replace the main control board or GFCI module as a unit.

If E03 reappears after drying and inspection, discontinue use until the charger is evaluated by a qualified EVSE technician, as persistent ground faults can indicate serious safety issues.