Mennekes
Acoustic Noise from Contactor or Transformer
Charger makes loud humming or buzzing noise 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
Worn or loose main contactor, Vibrating transformer or choke, Loose mounting screws, Excessive mains voltage causing magnetostriction
How to Fix / Troubleshooting
Safety first: De-energize before touching internal components.
- Identify source: Remove the cover and carefully listen (with power on, qualified person) to locate the noise source: contactor, transformer, or choke.
- Tighten mounting: With power OFF, tighten mounting screws for the noisy component and ensure any vibration-damping pads are in place.
- Contactor replacement: If the contactor buzzes loudly and intermittently drops out, replace it with a Mennekes-approved part.
- Check supply voltage: Have an electrician verify that supply voltage is within specification.
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Repair Difficulty
Medium
3/5
Required Part
Main Power Contactor / Input Transformer or Choke
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