E9
Henry Battery Management / Voltage Sense Fault

Vacuum runs but battery indicator behaves erratically (jumps from full to empty, flashes E9), unit may cut out unexpectedly

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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

Faulty battery management electronics in battery pack, Loose sense wire connection in battery, Defective control PCB voltage sensing circuit, Corroded battery contacts

How to Fix / Troubleshooting

Safety first: Remove the battery pack before cleaning contacts. Do not open the battery casing.

Step-by-step:

  • 1. Clean contacts: Use a dry cloth to clean the metal contacts on the battery and inside the handle. Lightly polish any dull or oxidised areas. Do not use abrasives or liquids.
  • 2. Check for movement: Fit the battery and gently wiggle it while the vacuum is running. If the indicator flickers or the unit cuts out, the contacts may be loose or worn.
  • 3. Test run time: Fully charge the battery, then run the vacuum continuously in low mode and time how long it runs. Compare with the expected run time in the user manual.
  • 4. Try another battery (if available): If the problem disappears with a different battery, the original pack's internal electronics are likely faulty.

When to stop: If E9 persists with multiple batteries, the main control PCB may be misreading voltage. This requires professional diagnosis and PCB replacement.

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Repair Difficulty

Medium 3/5

Required Part

Henry Cordless Battery Pack
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