E12
Schumacher
Internal Configuration / Calibration Error
Charger shows E12 and refuses to start; may be accompanied by a network or Wi‑Fi icon flashing on smart models.
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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
Corrupted configuration memory, Failed self-calibration of current sensor, Incomplete firmware update, Faulty EEPROM on control board
How to Fix / Troubleshooting
Safety first: Ensure the charger is not actively charging before performing resets or updates.
- Factory reset: Follow the Schumacher user manual to perform a factory reset from the front panel or mobile app. This often clears configuration errors.
- Firmware update: Connect the charger to your network (if supported) and check for firmware updates via the Schumacher app or web interface. Apply any available updates, following instructions carefully.
- Power cycle: After reset or update, turn the breaker OFF for 2 minutes, then ON to force a full reboot.
- If E12 remains: The non-volatile memory (EEPROM/flash) on the control board may be defective. Board replacement by an authorized service center is typically required.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Board
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