E19
BYD
Power Module Derating / Overload Protection
Charger displays E19 and charging current is reduced or disabled; may mention 'derating' or 'thermal limit'.
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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
Continuous operation at maximum current in high ambient temperature, Failing power module IGBTs or MOSFETs, Poor thermal contact between power module and heatsink, Blocked internal airflow
How to Fix / Troubleshooting
Safety first: Overheating power electronics can fail catastrophically. Allow the unit to cool before touching.
- Reduce current setting: In the BYD app or interface, lower the maximum charging current and test if charging stabilizes.
- Improve ventilation: Ensure the charger is not enclosed in a tight cabinet and that vents are unobstructed.
- Check ambient temperature: If installed in a very hot location, consider shading or relocating the unit.
- Power-cycle after cool-down: Turn off the breaker for 30 minutes, then restore power and test.
- Persistent derating at low loads: The power module may be failing and should be tested and replaced by a technician.
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Repair Difficulty
Hard
4/5
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