E10
Lucid
Self-Test / Contactor Pre-Charge Failure
Display shows E10; charger will not connect to vehicle and may show ‘Relay Test Failed’ or ‘Self-Test Error’.
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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
Failed pre-charge resistor on Lucid power board, Faulty contactor auxiliary contacts, Firmware mismatch between control board and power module
How to Fix / Troubleshooting
Safety first: Turn OFF power before opening the unit.
Steps:
- Power-cycle and update: Turn breaker OFF for 5 minutes, then ON. If the Lucid charger supports firmware updates via app, check for and apply any pending updates.
- Listen for test clicks: During startup, the charger may briefly actuate the contactor. Absence of this may indicate a contactor or control issue.
- Inspect wiring: With cover removed and power OFF, verify the auxiliary contact feedback wires are firmly connected to the Lucid control board.
Resolution: If E10 remains, the pre-charge circuit or contactor feedback is likely defective. Replace the Lucid power module or contactor assembly per service instructions.
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Repair Difficulty
Professional Required
5/5
Required Part
Lucid Power Module / Contactor Assembly
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