E6
MUSTART Relay / Contactor Stuck or Faulty

Charger shows “E6” and will not charge; sometimes appears after a lightning storm or power surge.

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Welded internal power relay contacts, failed relay driver circuit on main control board, surge damage to relay coil, mechanical failure of relay inside charger

How to Fix / Troubleshooting

Safety warning: Do not attempt to open the charger or tap on the housing to free the relay. High voltage components are inside.

  • Power cycle: Turn off the breaker or unplug the charger for 5 minutes, then restore power and test again.
  • Listen for relay click: When you plug the EV in and charging should start, you should normally hear a click from inside the MUSTART unit. If E6 appears and there is no click, the relay may not be engaging.
  • Check for surge damage: If E6 appeared immediately after a known power surge or lightning event, internal components may be damaged. Do not continue trying to use the charger.
  • Service required: A stuck or failed relay requires replacement of the main control board or relay assembly by the manufacturer or a qualified service center.
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Repair Difficulty

Professional Required 5/5

Required Part

Main Control Board (Power Relay / Contactor)
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