E1
MUSTART
Pilot Signal Fault / EVSE–EV Communication Error
Display shows “E1” and charging does not start or stops immediately after plugging into the vehicle.
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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
Damaged pilot wire in charging cable, failed pilot circuit on main control board, bent or contaminated pilot pin in J1772 connector, internal wiring harness fault between control board and cable
How to Fix / Troubleshooting
Safety warning: Disconnect the charger from the wall outlet or turn off the dedicated breaker before touching the cable for detailed inspection. Do not open the charger housing.
- Power cycle: Turn off the breaker or unplug the MUSTART charger for 2 minutes, then restore power and test again.
- Inspect J1772 connector: Check the small pilot pin (usually the thinner pin) for bending, discoloration, or debris. Clean gently with a dry brush. Do not insert metal tools into the connector.
- Check cable strain: Look along the length of the MUSTART charging cable for kinks, crushed sections, or cuts, especially near the handle and where the cable enters the charger housing. If you see exposed copper or a soft/bulged area, stop using the charger.
- Test with another EV (if possible): If E1 appears with multiple vehicles, the internal pilot circuit on the main control board is likely faulty and the unit should be serviced or replaced.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Board (Pilot Circuit) or J1772 Charging Cable Assembly
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