E18
Wacker Neuson Current Imbalance / Overcurrent on Single Phase

Generator stops and E18 is recorded when load is applied to one phase

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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

Uneven load distribution across phases, Short circuit on one phase, Faulty current transformer (CT), Loose phase conductor

How to Fix / Troubleshooting

Safety first: Isolate the generator from the load via the transfer switch. Only qualified personnel should work inside live panels.

  • Inspect load distribution: Review which circuits are on each phase. Move large single-phase loads to balance phases as evenly as possible.
  • Check for shorts: Use an insulation tester or multimeter to check for line-to-neutral or line-to-ground shorts on the affected phase.
  • Inspect CT wiring: Locate the current transformers feeding the controller. Ensure they are correctly oriented and that secondary wiring is tight and undamaged.
  • Tighten terminals: Tighten all phase and neutral connections in the generator terminal box and ATS.
  • Reset and test: Clear E18 and reapply load gradually while monitoring phase currents.
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Repair Difficulty

Professional Required 5/5

Required Part

Current Transformer Set
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