Charger displays E04 and does not energize; vehicle does not detect charging current.

Safety first: Turn off the breaker and verify zero voltage at the charger input before opening the unit. The internal relay switches high current and must not be touched when energized.

• 1. Power-cycle test:
  • Disconnect power for 2–3 minutes, then restore power and attempt to start a charge.
  • Listen for a distinct click from inside the Megear unit when charging should start.
• 2. If no click is heard:
  • Open the housing with power disconnected.
  • Locate the main power relay/contactor on the relay board.
  • Check for burnt smell, discoloration, or cracked casing.
  • Ensure the low-voltage control connector from the main control board to the relay coil is firmly seated.
• 3. If relay is clicking but E04 persists:
  • The contacts may be welded or not making proper contact.
  • With power off, inspect the relay terminals for signs of overheating or melted insulation.
  • Replace the relay board if any damage is visible.
• 4. Board-level replacement:
  • Megear chargers typically use a relay board or integrated main control board.
  • Desoldering and replacing individual relays is not recommended for non-professionals; replace the entire board assembly.

If you are not experienced with high-voltage electronics, have a professional EVSE technician replace the relay or main control board. Do not bypass or jumper the relay under any circumstances.