E14
Schumacher
Current Sensor Calibration / Range Error
Charger shows E14 and stops charging; may occur when vehicle requests high current.
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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
Failed internal current transformer (CT), Loose CT harness connection, Control board ADC failure, Incorrect calibration data
How to Fix / Troubleshooting
Safety first: Turn OFF the breaker before removing covers. Current sensors are around high-voltage conductors.
- Power reset and factory reset: Perform a factory reset per the manual, then power cycle the unit. Some models re-calibrate the current sensor at startup.
- Inspect CT connections: If qualified, open the charger and locate the current transformer around the output conductor. Ensure its plug-in harness is fully seated on the control board.
- Check for physical damage: Look for cracked CT housing or burned wiring. Replace the CT assembly if damaged.
- If E14 continues: The control board’s measurement circuitry or calibration memory may be defective. Professional replacement of the CT or control board is required.
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Repair Difficulty
Professional Required
5/5
Required Part
Output Current Transformer (CT) Sensor
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