E18
Jaguar Phase Loss / Phase Imbalance (Three‑Phase Models)

Charger shows E18; app may say ‘Phase loss’ or ‘Phase imbalance detected’.

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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

Blown upstream fuse on one phase, Loose phase conductor at wallbox terminal, Internal wiring fault to contactor, Faulty phase detection circuit on PCB

How to Fix / Troubleshooting

Safety first: Three‑phase systems carry high fault currents. Only qualified electricians should work on them.

  • Step 1 – Verify supply: Using a multimeter, measure voltage between all phase pairs (L1–L2, L2–L3, L1–L3) at the distribution board and at the Jaguar wallbox terminals. All should be within spec.
  • Step 2 – Inspect terminations: With power OFF, tighten all phase terminals in the charger and upstream isolator. Look for signs of overheating.
  • Step 3 – Check fuses/breakers: Confirm that all three phases are protected and that none of the fuses or breakers have tripped or blown.
  • Step 4 – Internal wiring: Trace internal phase conductors from the terminal block to the contactor and PCB sensing points. Repair any damaged wires.
  • Step 5 – PCB phase sensing: If supply and wiring are correct but E18 persists, the phase detection circuit on the control PCB may be faulty and require replacement.
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Repair Difficulty

Professional Required 5/5

Required Part

Jaguar Wallbox Phase Detection Circuit / Internal Wiring Harness
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