BYD
Cooling Fan Control / Thermal Management Issue
Charger’s internal fan runs very loudly or continuously, even at low charging currents 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
Stuck fan relay or MOSFET on main PCB, Clogged air passages causing higher temperatures, Faulty temperature sensor reading high, Aging fan bearings increasing noise
How to Fix / Troubleshooting
Safety first: Turn off power before attempting any cleaning near vents.
- Check vents: Ensure all ventilation openings on the BYD charger are clear of dust, cobwebs, and obstructions.
- Clean gently: Use a soft brush or vacuum to remove dust from vents; do not insert objects into the fan.
- Monitor temperature: If the enclosure is only slightly warm but the fan is at full speed, the sensor or control may be faulty.
- Professional service: A technician can open the unit, inspect the fan, and test the temperature sensors and fan driver circuit.
- Replace noisy fan: If the fan bearings are worn and noisy, replace the fan assembly.
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Repair Difficulty
Medium
3/5
Required Part
Cooling Fan Assembly
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