Polestar
Excessive Vibration or Acoustic Noise from Power Components
Charger emits a loud humming or buzzing noise during operation, louder than normal transformer 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 mounting of contactor or power module, Saturated inductor or transformer, High harmonic currents, Mechanical resonance in enclosure
How to Fix / Troubleshooting
Safety first: Turn off power before tightening any internal components.
- Identify source: With the cover removed and power on (technician only), carefully localize the noise to a specific component such as the contactor or inductor.
- Tighten mounts: Turn power off and tighten mounting screws for the noisy component and any nearby brackets.
- Check for damage: If the component shows signs of overheating or physical damage, replace it with the correct Polestar part.
- Monitor operation: After reassembly, run a charging session and confirm that noise is reduced to a normal level.
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Repair Difficulty
Medium
3/5
Required Part
Polestar Power Module
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