E04
BYD
Overtemperature Protection Trip
Charger shows E04 and does not energize; may occur during hot weather or long charging sessions.
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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
Blocked ventilation slots on BYD wallbox enclosure, Failed internal cooling fan, High ambient temperature exceeding design limits, Faulty temperature sensor on power module or main PCB
How to Fix / Troubleshooting
Safety first: Overheating can damage components. Allow the charger to cool before touching the enclosure.
- Check ventilation: Ensure there is at least the manufacturer-recommended clearance around the BYD charger (typically 10–20 cm). Remove any objects blocking vents.
- Inspect for dust buildup: With power off, gently vacuum or blow dust away from external vents. Do not open the sealed enclosure unless you are qualified.
- Allow cool-down: Turn off the breaker for 30 minutes to let internal components cool, then restore power and retry.
- Listen for fan operation: During startup or charging, you should hear the internal cooling fan (if equipped). If silent and E04 recurs, the fan may have failed.
- Persistent E04 in normal ambient temperatures: A faulty temperature sensor or power module may be misreading. Contact a technician to test the NTC/temperature probe and power module.
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Repair Difficulty
Medium
3/5
Required Part
Cooling Fan Assembly
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