E18
Walli Phase Loss / Phase Imbalance Detection

Charger shows E18; app indicates 'Phase loss' or 'Phase imbalance' on three‑phase Walli models.

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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 Walli terminal block, Faulty phase detection circuit on Walli main board, Incorrect wiring of three‑phase supply

How to Fix / Troubleshooting

Safety first: Three‑phase circuits carry high fault energy. Only qualified personnel should work on them.

Steps:

  • Verify supply: Have an electrician measure voltage between all phase pairs (L1‑L2, L2‑L3, L1‑L3) and to neutral at the Walli input.
  • Inspect terminals: With power off, tighten all phase terminals in the Walli and check for discoloration or heat damage.
  • Check upstream protection: Inspect fuses or breakers feeding each phase and replace any blown fuses with the correct type and rating.
  • Configuration check: Ensure the Walli is configured for the correct supply type (3P+N vs 1P+N) in its installer settings.
  • If supply is correct but E18 remains: The phase monitoring circuit on the Walli main control board may be faulty and the board should be replaced.
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Repair Difficulty

Professional Required 5/5

Required Part

Walli main control board
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