E8
Hitachi Power Mode Switching / Current Limit Fault

Vacuum cannot switch to high/turbo mode; E8 appears when attempting to change power level.

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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

Weak or aged battery unable to supply high current, High resistance at battery contacts, Failing main power MOSFETs on control PCB, Shorted motor winding causing high current draw

How to Fix / Troubleshooting

Safety first: Remove the battery before inspecting contacts.

  • Check battery health: Fully charge the battery in the original Hitachi charger. If the runtime is significantly reduced or the vacuum cannot enter high mode even immediately after charging, the battery may be worn out.
  • Clean contacts: Inspect and gently clean the battery and vacuum contacts with a dry cloth. Ensure there is no oil, corrosion, or deformation.
  • Test with another battery: If a second battery allows high mode, replace the original battery.

If E8 occurs even with a known‑good battery, the main control PCB or motor may be drawing excessive current. This requires professional diagnosis and likely replacement of the PCB or motor assembly.

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Repair Difficulty

Hard 4/5

Required Part

Lithium-Ion Battery Pack
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