E12
Primecom
Firmware / Microcontroller Fault
Display shows E12 and the charger does not respond to button presses or vehicle connection.
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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 firmware in main MCU, Electrostatic discharge damage, Power interruption during firmware update (if supported), Faulty microcontroller chip
How to Fix / Troubleshooting
Safety first: Treat the charger as non-functional until the fault is resolved. Disconnect from power before any disassembly.
- 1. Hard reset: Turn off the breaker or unplug the charger for at least 5 minutes to fully discharge internal circuits, then restore power.
- 2. Check for firmware update procedure: Some Primecom models may support firmware updates via USB or service port. Follow only official instructions from Primecom; do not attempt unofficial firmware.
- 3. Avoid repeated power cycling: Rapidly switching power on and off can worsen firmware or memory issues.
- 4. Professional service: If E12 persists and no user-accessible firmware update is available, the main control board (with integrated microcontroller) will typically need replacement.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control Board / Microcontroller
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