E08
Zaptec
Overtemperature Protection
Zaptec charger displays E08; app message: ‘Temperature too high’ and charging is reduced or stopped
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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 around charger, Direct sunlight on enclosure, Loose or undersized wiring causing hot terminals, Faulty internal temperature sensor on main board
How to Fix / Troubleshooting
Safety first: Overheating can lead to fire. Do not cover the charger or operate it beyond its temperature rating.
Steps:
- Check installation environment: Ensure there is free airflow around the charger and it is not enclosed in a sealed box. Shade the unit from direct sun if outdoors.
- Reduce charging current: Use the app to lower the maximum current and see if E08 stops occurring.
- Inspect for external heat sources: Avoid mounting near boilers, heaters, or exhaust vents.
- Technician inspection: With power off, open the unit and inspect terminals for discoloration or melted insulation. Tighten connections and replace any heat-damaged wiring.
- If physical causes are absent: The internal temperature sensor or its circuit on the main board may be faulty and require board replacement.
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Repair Difficulty
Medium
3/5
Required Part
Internal Temperature Sensor / Main Control Board
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