ChargePoint
Noisy or Chattering Contactor / Coil
Charger makes loud buzzing or chattering noises during operation; may coincide with flickering LEDs or intermittent charging.
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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
Low coil voltage due to control board issue, Loose contactor mounting, Worn contactor coil, AC supply fluctuations
How to Fix / Troubleshooting
Note: A slight hum is normal; loud buzzing or rapid clicking is not.
- Step 1 – Observe pattern:
- Determine if noise occurs only when charging or also at idle.
- Step 2 – Check supply voltage:
- Have an electrician verify stable voltage at the charger input.
- Step 3 – Internal inspection (qualified):
- With power OFF, open the housing.
- Ensure the power contactor is firmly mounted and all screws are tight.
- Step 4 – Coil voltage test:
- With power ON and a charge commanded, measure coil voltage; compare to spec.
- If low or unstable, suspect the main control board.
- Step 5 – Replace contactor:
- If coil voltage is correct but buzzing persists, replace the power contactor.
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Repair Difficulty
Hard
4/5
Required Part
Power Contactor
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