MUSTART
Intermittent Output Drop / Thermal or Connection Issue
Charger starts charging but stops after a few minutes with no error code on the display; EV may show “Charging stopped by EVSE.”
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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
Overheating plug at NEMA outlet, loose internal line connection, marginal relay contacts heating under load, undersized branch circuit wiring
How to Fix / Troubleshooting
Safety warning: Overheated connections can cause fire. If you smell burning plastic or feel excessive heat, stop using the charger immediately.
- Check outlet temperature: After a few minutes of charging, carefully touch the wall outlet and the MUSTART plug. They should be warm at most, not hot. If hot, stop charging and call an electrician.
- Inspect for discoloration: Look for browning or melting around the outlet or plug blades.
- Reduce current: Lower the charger’s current setting and see if the session can complete without stopping.
- Professional inspection: If the problem persists, have an electrician check the circuit and a technician inspect the charger’s internal connections and relay.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Board (Power Relay) or Input Power Cord/Plug
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