Mercedes-Benz
Low-Voltage Supply Instability
Wallbox LEDs or display flicker or dim intermittently while charging, but charging continues.
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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 low-voltage connector on Mercedes-Benz control board, Failing internal DC/DC converter, Electrical noise from mains, Overloaded auxiliary power rail
How to Fix / Troubleshooting
Safety first: Isolate power before accessing internal electronics.
- Observe pattern: Note whether flicker coincides with relay operation or external loads switching on/off.
- Inspect connectors: With the cover removed, gently press on low-voltage connectors to ensure they are fully seated.
- Check for corrosion: Look for oxidation on connector pins and clean or replace as needed.
- Service if persistent: If flicker continues, the internal DC/DC converter or control board may be failing and should be replaced.
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Repair Difficulty
Medium
3/5
Required Part
Internal DC/DC Converter / Control Board
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