Siemens No Mains Supply / Internal Fuse Open

No power at Siemens EV home charger; display and LEDs are completely off and vehicle does not detect 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

Tripped upstream circuit breaker or RCD, Blown internal fuse on Siemens wallbox power input, Loose line or neutral conductor at terminal block, Defective main power switch (if equipped)

How to Fix / Troubleshooting

Safety first: Treat all wiring as live until proven otherwise. Only qualified persons should open distribution panels or the charger housing.

  • Check upstream protection: Inspect the dedicated breaker and RCD for the charger. Reset if tripped, but if it trips again immediately, stop and investigate further.
  • Verify supply voltage: Use a multimeter to confirm that correct voltage is present at the charger’s supply terminals.
  • Inspect internal fuse: With power OFF and cover removed, locate any internal fuses on the input side. Replace only with the exact type and rating specified by Siemens.
  • Check terminal tightness: Ensure L, N, and PE conductors are firmly secured in the terminal block with no signs of overheating.

If there is confirmed voltage at the input but the charger remains dead, the internal power supply or main control board is likely faulty and requires professional service.

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Repair Difficulty

Hard 4/5

Required Part

Input Fuse / Main Control Board
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