Mercedes-Benz
Cooling System Overactivity
Wallbox fan (if equipped) runs loudly or continuously, even at low load or when idle.
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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
Faulty temperature sensor reading high in Mercedes-Benz wallbox, Blocked air vents causing poor cooling, Fan bearing wear causing noise, Firmware threshold set conservatively
How to Fix / Troubleshooting
Safety first: Isolate power before cleaning or replacing the fan.
- Clean vents: Remove dust and debris from all ventilation openings using a soft brush or vacuum.
- Inspect fan: Check for wobbling, grinding noise, or obstruction. Replace the fan if bearings are noisy.
- Check temperature sensor: If the fan runs at full speed even when the unit is cold, the temperature sensor may be faulty and require replacement.
- Firmware check: Update firmware to ensure correct fan control logic.
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Repair Difficulty
Medium
3/5
Required Part
Cooling Fan / Temperature Sensor
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