Shell Recharge Excessive Electrical Hum / Vibration

Charger emits a loud humming or buzzing noise during charging, louder than a normal contactor click or faint hum.

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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

Loose main contactor mounting, Contactor coil operating at incorrect voltage, Resonance in enclosure panels, Overloaded or failing transformer in low-voltage PSU

How to Fix / Troubleshooting

Note: Some low-level hum is normal, but loud or new noises should be investigated.

  • Step 1 – Compare at lower current: Reduce the charging current in the app and see if the noise decreases.
  • Step 2 – Check mounting: Ensure the Shell Recharge unit is firmly mounted to a solid wall; loose mounting can amplify vibration.
  • Step 3 – Technician inspection: With power off, a technician can open the unit and check that the contactor and transformer are securely fastened and not visibly damaged.
  • Step 4 – Replace noisy components: If the contactor or transformer is the source of excessive noise, replacement is recommended.
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Repair Difficulty

Medium 3/5

Required Part

Main Power Contactor
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