MUSTART
No Power / Internal Power Supply Failure
Charger will not power on at all; no display, no lights, and no relay click when plugged into the outlet.
Advertisements
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.
Advertisements
Possible Causes
Tripped breaker or no supply voltage, failed internal low‑voltage power supply on main control board, loose line connection at charger input, blown internal fuse (if equipped)
How to Fix / Troubleshooting
Safety warning: High voltage is present at the supply. Do not open the charger housing or panel unless you are a licensed electrician.
- Check breaker: Verify the dedicated EV charger breaker in your panel is in the ON position and has not tripped. Reset if necessary.
- Test outlet: Plug a known‑good high‑power appliance (e.g., electric range or RV tester) into the same NEMA outlet, if compatible, to confirm power is present. Alternatively, have an electrician measure voltage.
- Inspect plug and cord: Ensure the MUSTART plug is fully inserted and the cord is not damaged near the plug.
- Persistent no‑power: If the outlet has correct voltage and the charger remains completely dead, the internal power supply or fuse on the main control board has likely failed and the unit requires professional repair or replacement.
Advertisements
Repair Difficulty
Hard
4/5
Required Part
Main Control Board (Internal Power Supply / Fuse)
Check Price on Amazon
We may earn a commission from links on this page.
Advertisements