EVBox
Abnormal Acoustic Noise from Contactor or Power Electronics
Charger makes unusual buzzing, humming, or clicking noises during operation.
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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, Vibrating transformer or inductor, Rapid contactor switching due to unstable control, Overvoltage or undervoltage causing coil chatter
How to Fix / Troubleshooting
Safety: Do not place your ear directly against the enclosure while the unit is energized.
- Characterize the noise: A single click at start/stop is normal; continuous rapid clicking or loud buzzing is not.
- Check supply stability: Have an electrician verify that supply voltage is within the specified range and not fluctuating.
- Internal inspection (qualified): With power off, open the unit and check that the contactor and transformers/inductors are firmly mounted and that mounting screws are tight.
- Replace noisy components: If a contactor or inductor continues to buzz loudly under normal voltage, replace it with an EVBox‑approved part.
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Repair Difficulty
Hard
4/5
Required Part
EVBox Main Power Contactor
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