E09
Primecom
Control Pilot Duty Cycle / EVSE Signaling Error
Charger shows E09 and does not respond to vehicle connection; display may still show voltage and current settings.
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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
Faulty pilot signal generator on control board, Incorrect pilot duty cycle configuration, Short between pilot and proximity pins in J1772 connector, Damaged pilot resistor network
How to Fix / Troubleshooting
Safety first: Always de-energize the charger before opening the housing or handling internal wiring.
- 1. Power-cycle the charger: Turn off the breaker for 2 minutes, then restore power. Temporary firmware glitches can sometimes cause pilot errors.
- 2. Inspect J1772 connector pins: Look for bent or touching pilot and proximity pins. Clean out any debris that might be bridging the contacts.
- 3. Check cable strain relief: If the cable has been pulled hard, the pilot conductor or resistor network inside the handle may be damaged. Flex the cable gently while watching the display; intermittent E09 suggests a cable fault.
- 4. Test with another EV: If the error only appears with one vehicle, the vehicle inlet or its pilot circuit may be defective.
- 5. Board-level fault: Persistent E09 with multiple vehicles and a good cable indicates a defective pilot driver or resistor network on the main control board. Replacement of the board or entire charger is recommended.
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Repair Difficulty
Hard
4/5
Required Part
Control Pilot Circuit on Main Control Board
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