ABB
Cooling Fan Control or Bearing Wear
Charger’s internal fan 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
Fan bearings worn causing noise, Temperature sensor misreading high temperature, Fan control circuit stuck on, Dust buildup on fan blades
How to Fix / Troubleshooting
Observation: Some fan operation after charging is normal, but constant loud running is not.
- Clean vents: Remove dust from vents to reduce fan load.
- Monitor temperature: Check if the enclosure is actually hot. If not, the temperature sensor or control may be faulty.
- Internal inspection (technician): A technician should inspect the fan for wobble or noise when spun by hand and check temperature sensor readings via diagnostics.
- Replace fan: If bearings are noisy, replace the ABB-specified fan assembly.
- Check control board: If the fan is commanded on due to false high temperature, the sensor or control board may need replacement.
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Repair Difficulty
Medium
3/5
Required Part
Cooling Fan / Temperature Sensor
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