United Chargers No AC Supply / Internal Power Loss

Charger has no power at all; display is blank and no LEDs are lit.

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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

Tripped or faulty circuit breaker, Loose line connections at charger terminals, Blown internal fuse, Failed internal low-voltage power supply

How to Fix / Troubleshooting

Safety first: Only a qualified person should remove covers and test for live voltage.

  • Check breaker: Verify the EV charger breaker in the panel is ON and not tripped. Reset once if tripped; if it trips again, stop and investigate further.
  • Test outlet/circuit: Have an electrician confirm correct voltage at the charger input terminals.
  • Inspect internal fuse: With power OFF, open the charger and locate any internal fuses on the power supply board. Replace only with the same type and rating.
  • Check wiring: Ensure all line and ground conductors are securely tightened at the terminal block.

If correct voltage is present at the input but the charger remains dead, the internal power supply or main control board is likely defective and should be replaced.

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Repair Difficulty

Medium 3/5

Required Part

Internal Power Supply Module
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