MUSTART
Incorrect Pilot Current Signaling or EV Current Limiting
Charger appears to charge, but the EV reports a much lower charging current than the charger’s setting, with no error on the charger.
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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
Pilot signal amplitude drift on main control board, EV limiting current due to its own battery or temperature conditions, incorrect current configuration stored in charger
How to Fix / Troubleshooting
Safety warning: Do not attempt to modify internal pilot circuits.
- Verify charger setting: Confirm the current displayed on the MUSTART screen matches your expectation (e.g., 32 A).
- Check EV settings: Some EVs allow limiting charge current in their menus. Ensure no limit is set.
- Test another EV: If another vehicle charges at full expected current, the limitation is likely in the original EV.
- Service if charger‑related: If all EVs charge at reduced current despite correct settings, the pilot signal circuit on the main control board may be out of calibration and require replacement.
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Repair Difficulty
Medium
3/5
Required Part
Main Control Board (Pilot Signal Circuit)
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